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Jakobsen SS, Frøkjaer JB, Fisker RV, Kristensen SR, Thorlacius-Ussing O, Larsen AC. Monocyte recruitment in venous pulmonary embolism at time of cancer diagnosis in upper gastrointestinal cancer patients. J Thromb Thrombolysis 2024; 57:11-20. [PMID: 37792208 PMCID: PMC10830795 DOI: 10.1007/s11239-023-02897-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/12/2023] [Indexed: 10/05/2023]
Abstract
Upper gastrointestinal cancer is frequently complicated by venous thromboembolisms (VTE), especially pulmonary embolisms (PE) increase the mortality rate. Monocytes are a part of the innate immune system and up-regulation may indicate an ongoing inflammatory response or infectious disease and has lately been associated with a moderate risk of suffering from VTE. This prospectively study aims to compare the incidence of pulmonary embolism with markers of coagulation and compare it to the absolute monocyte count. A consecutive cohort of 250 patients with biopsy proven upper gastrointestinal cancer (i.e. pancreas, biliary tract, esophagus and gastric cancer) where included at the time of cancer diagnosis and before treatment. All patients underwent bilateral compression ultrasonography for detection of deep vein thrombosis (DVT). Of these 143 had an additionally pulmonary angiografi (CTPA) with the staging computer tomography. 13 of 250 patients (5.2%) had a DVT and 11 of 143 (7.7%) had CTPA proven PE. PE was significantly more common among patients with elevated D-dimer (OR 11.62, 95%CI: 1.13-119, P = 0.039) and elevated absolute monocyte count (OR 7.59, 95%CI: 1.37-41.98, P = 0.020). Only patients with pancreatic cancer had a significantly higher risk of DVT (OR 11.03, 95%CI: 1.25-97.43, P = 0.031). The sensitivity of absolute monocyte count was 63.6 (95%CI: 30.8-89.1) and specificity 80.3 (95%CI: 72.5-86.7), with a negative predictive value of 96.4 (95%CI: 91-99) in PE. An increased absolute monocyte count was detected in patients suffering from PE but not DVT, suggesting a possible interaction with the innate immune system.
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Affiliation(s)
- Sarah S Jakobsen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Hobrovej 18-22, 9000, Aalborg, Denmark
- Clinical Cancer Research Center, Aalborg University Hospital, 9000, Aalborg, Denmark
| | - Jens B Frøkjaer
- Department of Radiology, Aalborg University Hospital, 9000, Aalborg, Denmark
- Clinical Cancer Research Center, Aalborg University Hospital, 9000, Aalborg, Denmark
- Department of Clinical Medicine, Aalborg University, 9000, Aalborg, Denmark
| | - Rune V Fisker
- Department of Radiology, Aalborg University Hospital, 9000, Aalborg, Denmark
- Department of Nuclear Medicine, Aalborg University Hospital, 9000, Aalborg, Denmark
- Clinical Cancer Research Center, Aalborg University Hospital, 9000, Aalborg, Denmark
| | - Søren R Kristensen
- Department of Biochemistry, Aalborg University Hospital, 9000, Aalborg, Denmark
- Cardiovascular Research Center, Aalborg University, 9000, Aalborg, Denmark
| | - Ole Thorlacius-Ussing
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Hobrovej 18-22, 9000, Aalborg, Denmark
- Clinical Cancer Research Center, Aalborg University Hospital, 9000, Aalborg, Denmark
- Department of Clinical Medicine, Aalborg University, 9000, Aalborg, Denmark
| | - Anders C Larsen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Hobrovej 18-22, 9000, Aalborg, Denmark.
- Clinical Cancer Research Center, Aalborg University Hospital, 9000, Aalborg, Denmark.
- Department of Clinical Medicine, Aalborg University, 9000, Aalborg, Denmark.
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Souilla L, Larsen AC, Juhl CB, Skou ST, Bricca A. Childhood and adolescence physical activity and multimorbidity later in life: A systematic review. J Multimorb Comorb 2024; 14:26335565241231403. [PMID: 38333053 PMCID: PMC10851728 DOI: 10.1177/26335565241231403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Accepted: 01/17/2024] [Indexed: 02/10/2024]
Abstract
Background No systematic summary exists on childhood physical activity and later-life multimorbidity risks. We primarily investigated the association of physical activity in childhood and adolescence and the development of multimorbidity in adulthood. Secondarily, we examined whether physical activity level differ in children and adolescents with and without multimorbidity and whether there is a cross-sectional association between physical activity and multimorbidity. Methods Following Cochrane Handbook guidelines and adhering to PRISMA recommendations, we included cross-sectional, case-control and longitudinal studies that investigated the association between physical activity in children and adolescents and development of multimorbidity. Results were summarized narratively and we assessed the certainty of the evidence using the GRADE approach. The protocol was registered in PROSPERO, CRD42023407063. Results Of 9064 studies identified, 11 were included in 13 papers. Longitudinals studies suggested that being physically active in childhood and adolescence was associated with a lower risk of multimorbidity in adulthood. Three out of five studies reported lower physical activity level in children and adolescents with multimorbidity compared to those without, and two did not find a between-group difference. Cross-sectional evidence on the association between multimorbidity and lower physical activity was uncertain. Overall, the evidence certainty for all outcomes was considered low due to the indirectness and inconsistency in findings. Conclusions Childhood and adolescence physical activity appeared to be linked with a reduced risk of later-life multimorbidity but the certainty of the evidence is low. These results support the promotion of physical activity during childhood and adolescence.
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Affiliation(s)
- Luc Souilla
- University of Montpellier, PhyMedExp, INSERM, CNRS UMR, Montpellier, France
- CHRU Montpellier, Department of Paediatric and Congenital Cardiology, M3C Regional Reference Centre, Montpellier, France
| | - Anders C. Larsen
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
| | - Carsten B. Juhl
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- Department of Physiotherapy and Occupational Therapy, Copenhagen University Hospital, Copenhagen, Denmark
| | - Søren T. Skou
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- The Research and Implementation Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark
| | - Alessio Bricca
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
- The Research and Implementation Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark
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Stubbe BE, Madsen PH, Larsen AC, Krarup HB, Pedersen IS, Hansen CP, Johansen JS, Henriksen SD, Thorlacius-Ussing O. Promoter hypermethylation of SFRP1 as a prognostic and potentially predictive blood-based biomarker in patients with stage III or IV pancreatic ductal adenocarcinoma. Pancreatology 2023; 23:512-521. [PMID: 37230892 DOI: 10.1016/j.pan.2023.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/27/2023]
Abstract
BACKGROUND Pancreatic ductal adenocarcinoma remains one of the major causes of cancer-related mortality globally. Unfortunately, current prognostic biomarkers are limited, and no predictive biomarkers exist. This study examined promoter hypermethylation of secreted frizzled-related protein 1 (phSFRP1) in cfDNA as a prognostic biomarker and predictor of treatment effect in patients with metastatic FOLFIRINOX-treated PDAC and locally advanced PDAC. METHODS We performed methylation-specific PCR of the SFRP1 genes' promoter region, based on bisulfite treatment. Survival was assessed as time-to-event data using the pseudo-observation method and analyzed with Kaplan-Meier curves and generalized linear regressions. RESULTS The study included 52 patients with FOLFIRINOX-treated metastatic PDAC. Patients with unmethylated (um) SFRP1 (n = 29) had a longer median overall survival (15.7 months) than those with phSFRP1 (6.8 months). In crude regression, phSFRP1 was associated with an increased risk of death of 36.9% (95% CI 12.0%-61.7%) and 19.8% (95% CI 1.9-37.6) at 12 and 24-months, respectively. In supplementary regression analysis, interaction terms between SFRP1 methylation status and treatment were significant, indicating reduced benefit of chemotherapy. Forty-four patients with locally advanced PDAC were included. phSFRP1 was associated with an increased risk of death at 24-months CONCLUSIONS: This indicates that phSFRP1 is a clinically useful prognostic biomarker in metastatic PDAC and possibly in locally advanced PDAC. Together with existing literature, results could indicate the value of cfDNA-measured phSFRP1 as a predictive biomarker of standard palliative chemotherapy in patients with metastatic PDAC. This could facilitate personalized treatment of patients with metastatic PDAC.
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Affiliation(s)
- Benjamin E Stubbe
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark; Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Denmark.
| | - Poul H Madsen
- Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Molecular Diagnostics, Aalborg University Hospital, Denmark
| | - Anders C Larsen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark; Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Denmark
| | - Henrik B Krarup
- Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Molecular Diagnostics, Aalborg University Hospital, Denmark
| | - Inge S Pedersen
- Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Molecular Diagnostics, Aalborg University Hospital, Denmark; Department of Clinical Medicine, Aalborg University, Denmark
| | - Carsten P Hansen
- Department of Surgery, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Julia S Johansen
- Department of Medicine, Copenhagen University Hospital - Herlev and Gentofte, Herlev, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; Department of Oncology, Copenhagen University Hospital - Herlev and Gentofte, Herlev, Denmark
| | - Stine D Henriksen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark; Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Denmark
| | - Ole Thorlacius-Ussing
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark; Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Denmark
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Stubbe BE, Henriksen SD, Madsen PH, Larsen AC, Krarup HB, Pedersen IS, Johansen JS, Hansen CP, Thorlacius-Ussing O. Abstract B047: Promoter hypermethylation of SFRP1 as a prognostic and predictive blood-based biomarker in patients with stage IV pancreatic ductal adenocarcinoma. Cancer Res 2022. [DOI: 10.1158/1538-7445.panca22-b047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Abstract
Background: Pancreatic ductal adenocarcinoma (PDAC) is a disease with an abysmal prognosis. Unfortunately, no reliable prognostic or predictive blood-based biomarkers are currently available. An increasingly promising prognostic and predictive tool in cancer is the analysis of genetic and epigenetic alterations in cell-free DNA. One such alteration, promoter hypermethylation (ph) of SFRP1, has recently been linked to poor prognosis in gemcitabine-treated patients with stage IV PDAC. This study aimed to further examine phSFRP1 as a clinically relevant prognostic and predictive biomarker in FOLFIRINOX-treated patients with stage IV PDAC. Methods: Serum samples from patients with stage IV PDAC, treated with first-line FOLFIRINOX, were obtained from two danish biobanks. All blood samples were drawn before the initiation of palliative treatment. Based on a bisulfite treatment, we conducted a methylation-specific polymerase chain reaction analysis of the promoter region of the gene SFRP1. Methylation status was dichotomized based on the measured Cycle threshold. Survival according to SFRP1 promoter methylation status was assessed with Kaplan-Meier curves, log-rank tests, and Cox proportional hazard regression models. The adjusted Cox regression model included SFRP1 promoter methylation status, WHO performance status, age > 65 years, and sex. Results: Fifty-two FOLFIRINOX-treated patients with stage IV PDAC were included in the study. Patients with phSFRP1 (n = 23) had a median overall survival (mOS) of 6.8 months, significantly shorter than patients with unmethylated (um) SFRP1 (n = 29) who had a mOS of 15.7 months (log-rank test, p < 0.01). Likewise, in both crude and adjusted Cox-regression analysis, patients with phSFRP1 had an hazard ratio for death of 2.78 (95% CI 1.55-4.99) and 2.82 (95% CI 1.55-5.14) respectively, compared to patients with umSFRP1. Conclusions: Results indicate that FOLFIRINOX-treated stage IV PDAC patients with phSFRP1 have significantly shorter survival than patients with umSFRP1. Combined with previous literature, this indicates the value of phSFRP1 as a blood-based prognostic biomarker in patients with stage IV PDAC, regardless of the given first-line palliative chemotherapy. In addition, it indicates that phSFRP1 may also have predictive value for chemotherapy sensitivity in patients with stage IV PDAC. This knowledge may facilitate individualized treatment of patients with stage IV PDAC. Additionally, SFRP1 could be a valuable target for treatment with hypomethylating drugs to improve treatment response.
Citation Format: Benjamin E. Stubbe, Stine D. Henriksen, Poul H. Madsen, Anders C. Larsen, Henrik B. Krarup, Inge S. Pedersen, Julia S. Johansen, Carsten P. Hansen, Ole Thorlacius-Ussing. Promoter hypermethylation of SFRP1 as a prognostic and predictive blood-based biomarker in patients with stage IV pancreatic ductal adenocarcinoma [abstract]. In: Proceedings of the AACR Special Conference on Pancreatic Cancer; 2022 Sep 13-16; Boston, MA. Philadelphia (PA): AACR; Cancer Res 2022;82(22 Suppl):Abstract nr B047.
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Affiliation(s)
- Benjamin E. Stubbe
- 1Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark, Aalborg, Denmark,
| | - Stine D. Henriksen
- 1Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark, Aalborg, Denmark,
| | - Poul H. Madsen
- 2Department of Molecular Diagnostics, Aalborg University Hospital, Denmark, Aalborg, Denmark,
| | - Anders C. Larsen
- 1Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark, Aalborg, Denmark,
| | - Henrik B. Krarup
- 2Department of Molecular Diagnostics, Aalborg University Hospital, Denmark, Aalborg, Denmark,
| | - Inge S. Pedersen
- 2Department of Molecular Diagnostics, Aalborg University Hospital, Denmark, Aalborg, Denmark,
| | - Julia S. Johansen
- 3Department of Oncology, Copenhagen University Hospital – Herlev and Gentofte, Herlev, Herlev, Denmark,
| | - Carsten P. Hansen
- 4Department of Surgery, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark, Copenhagen, Denmark
| | - Ole Thorlacius-Ussing
- 1Department of Gastrointestinal Surgery, Aalborg University Hospital, Denmark, Aalborg, Denmark,
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5
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Markova M, von Neumann-Cosel P, Larsen AC, Bassauer S, Görgen A, Guttormsen M, Bello Garrote FL, Berg HC, Bjørøen MM, Dahl-Jacobsen T, Eriksen TK, Gjestvang D, Isaak J, Mbabane M, Paulsen W, Pedersen LG, Pettersen NIJ, Richter A, Sahin E, Scholz P, Siem S, Tveten GM, Valsdottir VM, Wiedeking M, Zeiser F. Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance. Phys Rev Lett 2021; 127:182501. [PMID: 34767384 DOI: 10.1103/physrevlett.127.182501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 04/15/2021] [Accepted: 09/21/2021] [Indexed: 06/13/2023]
Abstract
The validity of the Brink-Axel hypothesis, which is especially important for numerous astrophysical calculations, is addressed for ^{116,120,124}Sn below the neutron separation energy by means of three independent experimental methods. The γ-ray strength functions (GSFs) extracted from primary γ-decay spectra following charged-particle reactions with the Oslo method and with the shape method demonstrate excellent agreement with those deduced from forward-angle inelastic proton scattering at relativistic beam energies. In addition, the GSFs are shown to be independent of excitation energies and spins of the initial and final states. The results provide a critical test of the generalized Brink-Axel hypothesis in heavy nuclei, demonstrating its applicability in the energy region of the pygmy dipole resonance.
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Affiliation(s)
- M Markova
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - P von Neumann-Cosel
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S Bassauer
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - A Görgen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | | | - H C Berg
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M M Bjørøen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T Dahl-Jacobsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T K Eriksen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - D Gjestvang
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - J Isaak
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - M Mbabane
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - W Paulsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - L G Pedersen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - N I J Pettersen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A Richter
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - E Sahin
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - P Scholz
- Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA
| | - S Siem
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - G M Tveten
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - V M Valsdottir
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Wiedeking
- Department of Subatomic Physics, iThemba LABS, Somerset West 7129, South Africa
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - F Zeiser
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
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6
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Abstract
Dysphagia has several typical causes. In this case report a young adult with difficulties in swallowing since childhood is diagnosed with a rare anatomical variation of the aortal branches.
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Affiliation(s)
- Sarah S Jakobsen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Aalborg, Denmark
| | - Jens B Frøkjaer
- Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Anders C Larsen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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7
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Kibédi T, Alshahrani B, Stuchbery AE, Larsen AC, Görgen A, Siem S, Guttormsen M, Giacoppo F, Morales AI, Sahin E, Tveten GM, Garrote FLB, Campo LC, Eriksen TK, Klintefjord M, Maharramova S, Nyhus HT, Tornyi TG, Renstrøm T, Paulsen W. Radiative Width of the Hoyle State from γ-Ray Spectroscopy. Phys Rev Lett 2020; 125:182701. [PMID: 33196226 DOI: 10.1103/physrevlett.125.182701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 07/26/2020] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
The cascading 3.21 and 4.44 MeV electric quadrupole transitions have been observed from the Hoyle state at 7.65 MeV excitation energy in ^{12}C, excited by the ^{12}C(p,p^{'}) reaction at 10.7 MeV proton energy. From the proton-γ-γ triple coincidence data, a value of Γ_{rad}/Γ=6.2(6)×10^{-4} was obtained for the radiative branching ratio. Using our results, together with Γ_{π}^{E0}/Γ from Eriksen et al. [Phys. Rev. C 102, 024320 (2020)PRVCAN2469-998510.1103/PhysRevC.102.024320] and the currently adopted Γ_{π}(E0) values, the radiative width of the Hoyle state is determined as Γ_{rad}=5.1(6)×10^{-3} eV. This value is about 34% higher than the currently adopted value and will impact models of stellar evolution and nucleosynthesis.
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Affiliation(s)
- T Kibédi
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - B Alshahrani
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
- Department of Physics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
| | - A E Stuchbery
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A Görgen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S Siem
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - F Giacoppo
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A I Morales
- Dipartimento di Fisica dell'Universitá degli Studi di Milano and INFN-Milano, 20133 Milano, Italy
| | - E Sahin
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - G M Tveten
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | | | - L Crespo Campo
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T K Eriksen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Klintefjord
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S Maharramova
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - H-T Nyhus
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T G Tornyi
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
- Institute of Nuclear Research, MTA ATOMKI, Debrecen H-4026, Hungary
| | - T Renstrøm
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - W Paulsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
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8
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Liddick SN, Spyrou A, Crider BP, Naqvi F, Larsen AC, Guttormsen M, Mumpower M, Surman R, Perdikakis G, Bleuel DL, Couture A, Crespo Campo L, Dombos AC, Lewis R, Mosby S, Nikas S, Prokop CJ, Renstrom T, Rubio B, Siem S, Quinn SJ. Publisher's Note: Experimental Neutron Capture Rate Constraint Far from Stability [Phys. Rev. Lett. 116, 242502 (2016)]. Phys Rev Lett 2019; 122:129902. [PMID: 30978071 DOI: 10.1103/physrevlett.122.129902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Indexed: 06/09/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.116.242502.
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9
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Spyrou A, Liddick SN, Naqvi F, Crider BP, Dombos AC, Bleuel DL, Brown BA, Couture A, Crespo Campo L, Guttormsen M, Larsen AC, Lewis R, Möller P, Mosby S, Mumpower MR, Perdikakis G, Prokop CJ, Renstrøm T, Siem S, Quinn SJ, Valenta S. Strong Neutron-γ Competition above the Neutron Threshold in the Decay of ^{70}Co. Phys Rev Lett 2016; 117:142701. [PMID: 27740831 DOI: 10.1103/physrevlett.117.142701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 06/06/2023]
Abstract
The β-decay intensity of ^{70}Co was measured for the first time using the technique of total absorption spectroscopy. The large β-decay Q value [12.3(3) MeV] offers a rare opportunity to study β-decay properties in a broad energy range. Two surprising features were observed in the experimental results, namely, the large fragmentation of the β intensity at high energies, as well as the strong competition between γ rays and neutrons, up to more than 2 MeV above the neutron-separation energy. The data are compared to two theoretical calculations: the shell model and the quasiparticle random phase approximation (QRPA). Both models seem to be missing a significant strength at high excitation energies. Possible interpretations of this discrepancy are discussed. The shell model is used for a detailed nuclear structure interpretation and helps to explain the observed γ-neutron competition. The comparison to the QRPA calculations is done as a means to test a model that provides global β-decay properties for astrophysical calculations. Our work demonstrates the importance of performing detailed comparisons to experimental results, beyond the simple half-life comparisons. A realistic and robust description of the β-decay intensity is crucial for our understanding of nuclear structure as well as of r-process nucleosynthesis.
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Affiliation(s)
- A Spyrou
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S N Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Naqvi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - B P Crider
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C Dombos
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D L Bleuel
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-9234, USA
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Couture
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - L Crespo Campo
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - A C Larsen
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - R Lewis
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - P Möller
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S Mosby
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - M R Mumpower
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - G Perdikakis
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Central Michigan University, Mt. Pleasant, Michigan 48859, USA
| | - C J Prokop
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Renstrøm
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - S Siem
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - S J Quinn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Valenta
- Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, CZ-180 00 Prague 8, Czech Republic
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10
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Clément E, Zielińska M, Görgen A, Korten W, Péru S, Libert J, Goutte H, Hilaire S, Bastin B, Bauer C, Blazhev A, Bree N, Bruyneel B, Butler PA, Butterworth J, Delahaye P, Dijon A, Doherty DT, Ekström A, Fitzpatrick C, Fransen C, Georgiev G, Gernhäuser R, Hess H, Iwanicki J, Jenkins DG, Larsen AC, Ljungvall J, Lutter R, Marley P, Moschner K, Napiorkowski PJ, Pakarinen J, Petts A, Reiter P, Renstrøm T, Seidlitz M, Siebeck B, Siem S, Sotty C, Srebrny J, Stefanescu I, Tveten GM, Van de Walle J, Vermeulen M, Voulot D, Warr N, Wenander F, Wiens A, De Witte H, Wrzosek-Lipska K. Erratum: Spectroscopic Quadrupole Moments in ^{96,98}Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N=60 [Phys. Rev. Lett. 116, 022701 (2016)]. Phys Rev Lett 2016; 117:099902. [PMID: 27610893 DOI: 10.1103/physrevlett.117.099902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Indexed: 06/06/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.116.022701.
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11
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Liddick SN, Spyrou A, Crider BP, Naqvi F, Larsen AC, Guttormsen M, Mumpower M, Surman R, Perdikakis G, Bleuel DL, Couture A, Crespo Campo L, Dombos AC, Lewis R, Mosby S, Nikas S, Prokop CJ, Renstrom T, Rubio B, Siem S, Quinn SJ. Experimental Neutron Capture Rate Constraint Far from Stability. Phys Rev Lett 2016; 116:242502. [PMID: 27367386 DOI: 10.1103/physrevlett.116.242502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Indexed: 06/06/2023]
Abstract
Nuclear reactions where an exotic nucleus captures a neutron are critical for a wide variety of applications, from energy production and national security, to astrophysical processes, and nucleosynthesis. Neutron capture rates are well constrained near stable isotopes where experimental data are available; however, moving far from the valley of stability, uncertainties grow by orders of magnitude. This is due to the complete lack of experimental constraints, as the direct measurement of a neutron-capture reaction on a short-lived nucleus is extremely challenging. Here, we report on the first experimental extraction of a neutron capture reaction rate on ^{69}Ni, a nucleus that is five neutrons away from the last stable isotope of Ni. The implications of this measurement on nucleosynthesis around mass 70 are discussed, and the impact of similar future measurements on the understanding of the origin of the heavy elements in the cosmos is presented.
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Affiliation(s)
- S N Liddick
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Spyrou
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - B P Crider
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
| | - F Naqvi
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
| | - A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Mumpower
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
| | - R Surman
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - G Perdikakis
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - D L Bleuel
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550-9234, USA
| | - A Couture
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - L Crespo Campo
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A C Dombos
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Lewis
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Mosby
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S Nikas
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - C J Prokop
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Renstrom
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - B Rubio
- IFIC, CSIC-Universidad de Valencia, 46071 Valencia, Spain
| | - S Siem
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S J Quinn
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
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12
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Clément E, Zielińska M, Görgen A, Korten W, Péru S, Libert J, Goutte H, Hilaire S, Bastin B, Bauer C, Blazhev A, Bree N, Bruyneel B, Butler PA, Butterworth J, Delahaye P, Dijon A, Doherty DT, Ekström A, Fitzpatrick C, Fransen C, Georgiev G, Gernhäuser R, Hess H, Iwanicki J, Jenkins DG, Larsen AC, Ljungvall J, Lutter R, Marley P, Moschner K, Napiorkowski PJ, Pakarinen J, Petts A, Reiter P, Renstrøm T, Seidlitz M, Siebeck B, Siem S, Sotty C, Srebrny J, Stefanescu I, Tveten GM, Van de Walle J, Vermeulen M, Voulot D, Warr N, Wenander F, Wiens A, De Witte H, Wrzosek-Lipska K. Spectroscopic Quadrupole Moments in {96,98}Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N=60. Phys Rev Lett 2016; 116:022701. [PMID: 26824536 DOI: 10.1103/physrevlett.116.022701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Indexed: 06/05/2023]
Abstract
Neutron-rich {96,98}Sr isotopes have been investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility. Reduced transition probabilities and spectroscopic quadrupole moments have been extracted from the differential Coulomb excitation cross sections. These results allow, for the first time, the drawing of definite conclusions about the shape coexistence of highly deformed prolate and spherical configurations. In particular, a very small mixing between the coexisting states is observed, contrary to other mass regions where strong mixing is present. Experimental results have been compared to beyond-mean-field calculations using the Gogny D1S interaction in a five-dimensional collective Hamiltonian formalism, which reproduce the shape change at N=60.
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Affiliation(s)
- E Clément
- GANIL, CEA/DSM-CNRS/IN2P3, F-14076 Caen Cedex 05, France
- PH Department, CERN 1211, Geneva 23, Switzerland
| | - M Zielińska
- CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - A Görgen
- Department of Physics, University of Oslo, 0316 Oslo, Norway
| | - W Korten
- CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France
| | - S Péru
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - J Libert
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - H Goutte
- CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France
| | - S Hilaire
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - B Bastin
- GANIL, CEA/DSM-CNRS/IN2P3, F-14076 Caen Cedex 05, France
| | - C Bauer
- Institut für Kernphysik, Technische Universität Darmstadt, D-50937 Darmstadt, Germany
| | - A Blazhev
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - N Bree
- Instituut voor Kern-en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - B Bruyneel
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - P A Butler
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J Butterworth
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - P Delahaye
- GANIL, CEA/DSM-CNRS/IN2P3, F-14076 Caen Cedex 05, France
- PH Department, CERN 1211, Geneva 23, Switzerland
| | - A Dijon
- GANIL, CEA/DSM-CNRS/IN2P3, F-14076 Caen Cedex 05, France
| | - D T Doherty
- CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France
| | - A Ekström
- Physics Department, University of Lund, Box 118, SE-221 00 Lund, Sweden
| | - C Fitzpatrick
- Department of Physics, University of Manchester, M13 9PL Manchester, United Kingdom
| | - C Fransen
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - G Georgiev
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - R Gernhäuser
- Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85740 Garching, Germany
| | - H Hess
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - J Iwanicki
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - D G Jenkins
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - A C Larsen
- Department of Physics, University of Oslo, 0316 Oslo, Norway
| | - J Ljungvall
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - R Lutter
- Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85740 Garching, Germany
| | - P Marley
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - K Moschner
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - P J Napiorkowski
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - J Pakarinen
- PH Department, CERN 1211, Geneva 23, Switzerland
| | - A Petts
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - P Reiter
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - T Renstrøm
- Department of Physics, University of Oslo, 0316 Oslo, Norway
| | - M Seidlitz
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - B Siebeck
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - S Siem
- Department of Physics, University of Oslo, 0316 Oslo, Norway
| | - C Sotty
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France
| | - J Srebrny
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - I Stefanescu
- Instituut voor Kern-en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - G M Tveten
- PH Department, CERN 1211, Geneva 23, Switzerland
- Department of Physics, University of Oslo, 0316 Oslo, Norway
| | | | - M Vermeulen
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - D Voulot
- PH Department, CERN 1211, Geneva 23, Switzerland
| | - N Warr
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - F Wenander
- PH Department, CERN 1211, Geneva 23, Switzerland
| | - A Wiens
- Institute of Nuclear Physics, University of Cologne, D-50397 Cologne, Germany
| | - H De Witte
- Instituut voor Kern-en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - K Wrzosek-Lipska
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
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Guttormsen M, Larsen AC, Görgen A, Renstrøm T, Siem S, Tornyi TG, Tveten GM. Validity of the Generalized Brink-Axel Hypothesis in (238)Np. Phys Rev Lett 2016; 116:012502. [PMID: 26799014 DOI: 10.1103/physrevlett.116.012502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Indexed: 06/05/2023]
Abstract
We analyze primary γ-ray spectra of the odd-odd (238)Np nucleus extracted from (237)Np(d,pγ)(238)Np coincidence data measured at the Oslo Cyclotron Laboratory. The primary γ spectra cover an excitation-energy region of 0≤E(I)≤5.4 MeV, and allow us to perform a detailed study of the γ-ray strength as a function of excitation energy. Hence, we can test the validity of the generalized Brink-Axel hypothesis, which, in its strictest form, claims no excitation-energy dependence on the γ strength. In this work, using the available high-quality (238)Np data, we show that the γ-ray strength function is to a very large extent independent of the initial and final states. Thus, for the first time, the generalized Brink-Axel hypothesis is experimentally verified for γ transitions between states in the quasicontinuum region, not only for specific collective resonances, but also for the full strength below the neutron separation energy. Based on our findings, the necessary criteria for the generalized Brink-Axel hypothesis to be fulfilled are outlined.
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Affiliation(s)
- M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A Görgen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T Renstrøm
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S Siem
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T G Tornyi
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - G M Tveten
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
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14
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Larsen AC, Brøndum Frøkjaer J, Wishwanath Iyer V, Vincents Fisker R, Sall M, Yilmaz MK, Kuno Møller B, Kristensen SR, Thorlacius-Ussing O. Venous thrombosis in pancreaticobiliary tract cancer: outcome and prognostic factors. J Thromb Haemost 2015; 13:555-62. [PMID: 25594256 DOI: 10.1111/jth.12843] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 01/08/2015] [Indexed: 12/28/2022]
Abstract
BACKGROUND The differences in outcome among cancer patients with incidental vs. symptomatic venous thromboembolism (VTE) are unknown. In this study, patients with extrahepatic pancreaticobiliary tract cancer (PBC) were selected for a prospective cohort study between February 2008 and February 2011. METHODS At the time of cancer diagnosis, all patients were examined for deep vein thrombosis with bilateral compression ultrasonography (biCUS). Computed tomography pulmonary angiography was also performed to diagnose pulmonary embolisms. After inclusion, the patients were followed up with clinical examinations, blood collections, and biCUS. RESULTS A total of 121 PBC patients were enrolled. At the time of cancer diagnosis, 15 patients had experienced a VTE (12.4%, 95% confidence interval [CI] 7.1-19.6), including six symptomatic and nine incidental cases. A total of 25 first-time VTE events were identified (20.7%; 95% CI 13.8-29.0). Patients with a VTE had reduced survival, with a median overall survival (OS) of 4.4 months (95% CI 2.2-11.5). The median OS of the patients with incidental VTE was 3.0 months (95% CI 0.1-15.0), which was not different from the median OS of the patients with symptomatic VTE (5.0 months; 95% CI 2.1-14.5). The median OS was 11.9 months (95% CI 8.1-14.7) in the PBC patients with no VTEs. CONCLUSION The occurrence of a VTE event in a PBC patient within the first months of the disease is associated with significantly increased mortality.
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Affiliation(s)
- A C Larsen
- Department of Gastrointestinal Surgery, Aalborg University Hospital, Aalborg, Denmark; Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark
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Abstract
A strong enhancement at low γ-ray energies has recently been discovered in the γ-ray strength function of ^{56,57}Fe. In this work, we have for the first time obtained theoretical γ decay spectra for states up to ≈8 MeV in excitation for ^{56,57}Fe. We find large B(M1) values for low γ-ray energies that provide an explanation for the experimental observations. The role of mixed E2 transitions for the low-energy enhancement is addressed theoretically for the first time, and it is found that they contribute a rather small fraction. Our calculations clearly show that the high-ℓ(=f) diagonal terms are most important for the strong low-energy M1 transitions. As such types of 0ℏω transitions are expected for all nuclei, our results indicate that a low-energy M1 enhancement should be present throughout the nuclear chart. This could have far-reaching consequences for our understanding of the M1 strength function at high excitation energies, with profound implications for astrophysical reaction rates.
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Affiliation(s)
- B Alex Brown
- National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
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Spyrou A, Liddick SN, Larsen AC, Guttormsen M, Cooper K, Dombos AC, Morrissey DJ, Naqvi F, Perdikakis G, Quinn SJ, Renstrøm T, Rodriguez JA, Simon A, Sumithrarachchi CS, Zegers RGT. Novel technique for constraining r-process (n, γ) reaction rates. Phys Rev Lett 2014; 113:232502. [PMID: 25526121 DOI: 10.1103/physrevlett.113.232502] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Indexed: 06/04/2023]
Abstract
A novel technique has been developed, which will open exciting new opportunities for studying the very neutron-rich nuclei involved in the r process. As a proof of principle, the γ spectra from the β decay of ^{76}Ga have been measured with the SuN detector at the National Superconducting Cyclotron Laboratory. The nuclear level density and γ-ray strength function are extracted and used as input to Hauser-Feshbach calculations. The present technique is shown to strongly constrain the ^{75}Ge(n,γ)^{76}Ge cross section and reaction rate.
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Affiliation(s)
- A Spyrou
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S N Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C Larsen
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - K Cooper
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C Dombos
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Naqvi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - G Perdikakis
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Central Michigan University, Mount Pleasant, Michigan, 48859, USA
| | - S J Quinn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Renstrøm
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - J A Rodriguez
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Simon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - C S Sumithrarachchi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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18
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Bree N, Wrzosek-Lipska K, Petts A, Andreyev A, Bastin B, Bender M, Blazhev A, Bruyneel B, Butler PA, Butterworth J, Carpenter MP, Cederkäll J, Clément E, Cocolios TE, Deacon A, Diriken J, Ekström A, Fitzpatrick C, Fraile LM, Fransen C, Freeman SJ, Gaffney LP, García-Ramos JE, Geibel K, Gernhäuser R, Grahn T, Guttormsen M, Hadinia B, Hadyńska-Kle K K, Hass M, Heenen PH, Herzberg RD, Hess H, Heyde K, Huyse M, Ivanov O, Jenkins DG, Julin R, Kesteloot N, Kröll T, Krücken R, Larsen AC, Lutter R, Marley P, Napiorkowski PJ, Orlandi R, Page RD, Pakarinen J, Patronis N, Peura PJ, Piselli E, Rahkila P, Rapisarda E, Reiter P, Robinson AP, Scheck M, Siem S, Singh Chakkal K, Smith JF, Srebrny J, Stefanescu I, Tveten GM, Van Duppen P, Van de Walle J, Voulot D, Warr N, Wenander F, Wiens A, Wood JL, Zielińska M. Shape coexistence in the neutron-deficient even-even (182-188)Hg isotopes studied via coulomb excitation. Phys Rev Lett 2014; 112:162701. [PMID: 24815644 DOI: 10.1103/physrevlett.112.162701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Indexed: 06/03/2023]
Abstract
Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with 2.85 MeV/nucleon mercury beams from REX-ISOLDE. Magnitudes and relative signs of the reduced E2 matrix elements that couple the ground state and low-lying excited states in Hg182-188 were extracted. Information on the deformation of the ground and the first excited 0+ states was deduced using the quadrupole sum rules approach. Results show that the ground state is slightly deformed and of oblate nature, while a larger deformation for the excited 0+ state was noted in Hg182,184. The results are compared to beyond mean field and interacting-boson based models and interpreted within a two-state mixing model. Partial agreement with the model calculations was obtained. The presence of two different structures in the light even-mass mercury isotopes that coexist at low excitation energy is firmly established.
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Affiliation(s)
- N Bree
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - K Wrzosek-Lipska
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - A Petts
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - A Andreyev
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - B Bastin
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and GANIL CEA/DSM-CNRS/IN2P3, Boulevard H. Becquerel, F-14076 Caen, France
| | - M Bender
- Université Bordeaux, Centre d'Etudes Nucléaires de Bordeaux Gradignan, UMR5797, F-33175 Gradignan, France and CNRS/IN2P3, Centre d'Etudes Nucléaires de Bordeaux Gradignan, UMR5797, F-33175 Gradignan, France
| | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - B Bruyneel
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - P A Butler
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J Butterworth
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - M P Carpenter
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Cederkäll
- Physics Department, University of Lund, Box 118, SE-221 00 Lund, Sweden and ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - E Clément
- GANIL CEA/DSM-CNRS/IN2P3, Boulevard H. Becquerel, F-14076 Caen, France and ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - T E Cocolios
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and ISOLDE, CERN, CH-1211 Geneva 23, Switzerland and School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - A Deacon
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - J Diriken
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Belgian Nuclear Research Centre SCK CEN, B-2400 Mol, Belgium
| | - A Ekström
- Physics Department, University of Lund, Box 118, SE-221 00 Lund, Sweden
| | - C Fitzpatrick
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - L M Fraile
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland and Grupo de Física Nuclear, Universidad Complutense de Madrit, 28040 Madrid, Spain
| | - Ch Fransen
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - S J Freeman
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - L P Gaffney
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J E García-Ramos
- Departamento de Física Aplicada, Universidad de Huelva, 21071 Huelva, Spain
| | - K Geibel
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - R Gernhäuser
- Physics Department E12, Technische Universität München, D-85748 Garching, Germany
| | - T Grahn
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki, Finland
| | - M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - B Hadinia
- School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom and Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - K Hadyńska-Kle K
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - M Hass
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - P-H Heenen
- Physique Nucléaire Théorique, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - R-D Herzberg
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - H Hess
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - K Heyde
- Department of Physics and Astronomy, Ghent University, B-9000 Gent, Belgium
| | - M Huyse
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - O Ivanov
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - D G Jenkins
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - R Julin
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - N Kesteloot
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Belgian Nuclear Research Centre SCK CEN, B-2400 Mol, Belgium
| | - Th Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - R Krücken
- Physics Department E12, Technische Universität München, D-85748 Garching, Germany
| | - A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - R Lutter
- Department of Physics, Ludwig Maximilian Universität München, 85748 Garching, Germany
| | - P Marley
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - P J Napiorkowski
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - R Orlandi
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - R D Page
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J Pakarinen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki, Finland
| | - N Patronis
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Department of Physics, The University of Ioannina, GR-45110 Ioannina, Greece
| | - P J Peura
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - E Piselli
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - P Rahkila
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - E Rapisarda
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - A P Robinson
- Department of Physics, University of York, York YO10 5DD, United Kingdom and School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - M Scheck
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom and School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom and SUPA, Scottisch Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom
| | - S Siem
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - K Singh Chakkal
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - J F Smith
- School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - J Srebrny
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - I Stefanescu
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium and Physics Department E12, Technische Universität München, D-85748 Garching, Germany
| | - G M Tveten
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - P Van Duppen
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | | | - D Voulot
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - F Wenander
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - A Wiens
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - J L Wood
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
| | - M Zielińska
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland and IRFU/SPhN, CEA Saclay, F-91191 Gif-sur-Yvette, France
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19
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Larsen AC, Dabrowski T, Frøkjær JB, Fisker RV, Iyer VV, Møller BK, Kristensen SR, Thorlacius-Ussing O. Prevalence of venous thromboembolism at diagnosis of upper gastrointestinal cancer. Br J Surg 2014; 101:246-53. [PMID: 24446107 DOI: 10.1002/bjs.9353] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/24/2013] [Indexed: 01/27/2023]
Abstract
BACKGROUND Venous thromboembolism (VTE) in patients with upper gastrointestinal (GI) cancer increases morbidity and mortality. This study aimed to determine the prevalence of VTE at diagnosis of upper GI cancer. METHODS Patients admitted between February 2008 and February 2011 with upper GI cancer (pancreatic, extrahepatic biliary, lower oesophageal, gastro-oesophageal junction or gastric cancer) were investigated in a cross-sectional cohort study. At cancer diagnosis, all patients were examined for deep vein thrombosis (DVT) by means of bilateral compression ultrasonography. From February 2009 and onwards, computed tomographic pulmonary angiography (CTPA) was also performed for the diagnosis of pulmonary embolism (PE). RESULTS Some 250 patients had ultrasonography; CTPA was performed in 143 patients on admission. DVT was detected in 13 (5·2 per cent) of the 250 patients, eight (3·2 per cent) of whom were asymptomatic. DVT was correlated with tumour location in the pancreaticobiliary tract (odds ratio (OR) 6·27, 95 per cent confidence interval 1·18 to 33·38; P = 0·031) and tumour stage IV (OR 19·34, 2·33 to 160·70; P = 0·006). PE was detected in 11 (7·7 per cent) of 143 patients, eight (5·6 per cent) of whom were asymptomatic. PE embolism was also significantly more common in patients with pancreaticobiliary tract cancer (OR 7·81, 1·28 to 47·62; P = 0·026) and in those with stage IV disease (OR 17·19, 1·83 to 161·50; P = 0·013). CONCLUSION The prevalence of VTE at cancer diagnosis was significantly higher in patients with pancreaticobiliary tract cancer than in those with other forms of upper GI cancer, and in patients with advanced cancer stage.
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Affiliation(s)
- A C Larsen
- Department of Gastrointestinal Surgery, Aarhus University Hospital, Aalborg, Denmark
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20
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Larsen AC, Blasi N, Bracco A, Camera F, Eriksen TK, Görgen A, Guttormsen M, Hagen TW, Leoni S, Million B, Nyhus HT, Renstrøm T, Rose SJ, Ruud IE, Siem S, Tornyi T, Tveten GM, Voinov AV, Wiedeking M. Evidence for the dipole nature of the low-energy γ enhancement in 56Fe. Phys Rev Lett 2013; 111:242504. [PMID: 24483649 DOI: 10.1103/physrevlett.111.242504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Indexed: 06/03/2023]
Abstract
The γ-ray strength function of 56Fe has been measured from proton-γ coincidences for excitation energies up to ≈11 MeV. The low-energy enhancement in the γ-ray strength function, which was first discovered in the (3He,αγ)56Fe reaction, is confirmed with the (p,p'γ)56Fe experiment reported here. Angular distributions of the γ rays give for the first time evidence that the enhancement is dominated by dipole transitions.
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Affiliation(s)
- A C Larsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - N Blasi
- INFN, Sezione di Milano, I-20133 Milano, Italy
| | - A Bracco
- INFN, Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, University of Milano, I-20122 Milano, Italy
| | - F Camera
- INFN, Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, University of Milano, I-20122 Milano, Italy
| | - T K Eriksen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A Görgen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T W Hagen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S Leoni
- INFN, Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, University of Milano, I-20122 Milano, Italy
| | - B Million
- INFN, Sezione di Milano, I-20133 Milano, Italy
| | - H T Nyhus
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T Renstrøm
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S J Rose
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - I E Ruud
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - S Siem
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - T Tornyi
- Department of Physics, University of Oslo, N-0316 Oslo, Norway and Institute of Nuclear Research, MTA ATOMKI, H-4026 Debrecen, Hungary
| | - G M Tveten
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
| | - A V Voinov
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
| | - M Wiedeking
- iThemba LABS, Post Office Box 722, 7129 Somerset West, South Africa
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21
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Schwengner R, Frauendorf S, Larsen AC. Low-energy enhancement of magnetic dipole radiation. Phys Rev Lett 2013; 111:232504. [PMID: 24476264 DOI: 10.1103/physrevlett.111.232504] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 10/29/2013] [Indexed: 06/03/2023]
Abstract
Magnetic dipole strength functions are deduced from averages of a large number of M1 transition strengths calculated within the shell model for the nuclides 90Zr, 94Mo, 95Mo, and 96Mo. An enhancement of M1 strength toward low transition energy is found for all nuclides considered. Large M1 strengths appear for transitions between close-lying states with configurations including proton as well as neutron high-j orbits that recouple their spins and add up their magnetic moments coherently. The M1 strength function deduced from the calculated M1 transition strengths is compatible with the low-energy enhancement found in (3He, 3He') and (d, p) experiments. The Letter presents an explanation of the experimental findings.
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Affiliation(s)
- R Schwengner
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - S Frauendorf
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - A C Larsen
- Department of Physics, University of Oslo, 0316 Oslo, Norway
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22
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Guttormsen M, Bernstein LA, Bürger A, Görgen A, Gunsing F, Hagen TW, Larsen AC, Renstrøm T, Siem S, Wiedeking M, Wilson JN. Observation of large scissors resonance strength in actinides. Phys Rev Lett 2012; 109:162503. [PMID: 23215072 DOI: 10.1103/physrevlett.109.162503] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Indexed: 06/01/2023]
Abstract
The orbital M1 scissors resonance has been measured for the first time in the quasicontinuum of actinides. Particle-γ coincidences are recorded with deuteron and (3)He-induced reactions on (232)Th. The residual nuclei (231,232,233)Th and (232,233) Pa show an unexpectedly strong integrated strength of B(M1)=11-15μ(n)(2) in the E(γ)=1.0-3.5 MeV region. The increased γ-decay probability in actinides due to scissors resonance is important for cross-section calculations for future fuel cycles of fast nuclear reactors and may also have an impact on stellar nucleosynthesis.
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Affiliation(s)
- M Guttormsen
- Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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23
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Agvaanluvsan U, Larsen AC, Chankova R, Guttormsen M, Mitchell GE, Schiller A, Siem S, Voinov A. Enhanced radiative strength in the quasicontinuum of 117Sn. Phys Rev Lett 2009; 102:162504. [PMID: 19518705 DOI: 10.1103/physrevlett.102.162504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2008] [Revised: 11/10/2008] [Indexed: 05/27/2023]
Abstract
The radiative strength function of 117Sn has been measured up to the neutron separation energy using the (3He, 3He' gamma) reaction. An increase in the slope of the strength function around E gamma=4.5 MeV indicates the onset of a resonancelike structure, giving a significant enhancement of the radiative strength function compared to standard models in the energy region 4.5<or=E gamma<or=8.0 MeV. For the first time, the functional form of this resonancelike structure has been measured in an odd tin nucleus below neutron threshold in the quasicontinuum region.
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24
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Hurst AM, Butler PA, Jenkins DG, Delahaye P, Wenander F, Ames F, Barton CJ, Behrens T, Bürger A, Cederkäll J, Clément E, Czosnyka T, Davinson T, de Angelis G, Eberth J, Ekström A, Franchoo S, Georgiev G, Görgen A, Herzberg RD, Huyse M, Ivanov O, Iwanicki J, Jones GD, Kent P, Köster U, Kröll T, Krücken R, Larsen AC, Nespolo M, Pantea M, Paul ES, Petri M, Scheit H, Sieber T, Siem S, Smith JF, Steer A, Stefanescu I, Syed NUH, Van de Walle J, Van Duppen P, Wadsworth R, Warr N, Weisshaar D, Zielińska M. Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)+ state in 70Se: no evidence for oblate shape. Phys Rev Lett 2007; 98:072501. [PMID: 17359019 DOI: 10.1103/physrevlett.98.072501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2006] [Indexed: 05/14/2023]
Abstract
Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of 70Se ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation gamma rays in the highly segmented MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2+ state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2+ state in 70Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.
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Affiliation(s)
- A M Hurst
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
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