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Aumann T, Bertulani CA, Duer M, Galatyuk T, Obertelli A, Panin V, Rodríguez-Sánchez JL, Roth R, Stroth J. Nuclear structure opportunities with GeV radioactive beams at FAIR. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2024; 382:20230121. [PMID: 38910400 DOI: 10.1098/rsta.2023.0121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 04/10/2024] [Indexed: 06/25/2024]
Abstract
The Facility for Antiproton and Ion Research (FAIR) is in its final construction stage next to the campus of the Gesellschaft für Schwerionenforschung Helmholtzzentrum for heavy-ion research in Darmstadt, Germany. Once it starts its operation, it will be the main nuclear physics research facility in many basic sciences and their applications in Europe for the coming decades. Owing to the ability of the new fragment separator, Super-FRagment Separator, to produce high-intensity radioactive ion beams in the energy range up to about 2 GeV/nucleon, these can be used in various nuclear reactions. This opens a unique opportunity for various nuclear structure studies across a range of fields and scales: from low-energy physics via the investigation of multi-neutron systems and halos to high-density nuclear matter and the equation of state, following heavy-ion collisions, fission and study of short-range correlations in nuclei and hypernuclei. The newly developed reactions with relativistic radioactive beams (R3B) set up at FAIR would be the most suitable and versatile for such studies. An overview of highlighted physics cases foreseen at R3B is given, along with possible future opportunities, at FAIR. This article is part of the theme issue 'The liminal position of Nuclear Physics: from hadrons to neutron stars'.
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Affiliation(s)
- T Aumann
- Institut für Kernphysik, Technische Universität Darmstadt , Darmstadt 64289, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1 , Darmstadt 64291, Germany
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF) , Darmstadt 64291, Germany
| | - C A Bertulani
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF) , Darmstadt 64291, Germany
- Texas A&M University-Commerce , Commerce, TX 75429, USA
| | - M Duer
- Institut für Kernphysik, Technische Universität Darmstadt , Darmstadt 64289, Germany
| | - T Galatyuk
- Institut für Kernphysik, Technische Universität Darmstadt , Darmstadt 64289, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1 , Darmstadt 64291, Germany
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF) , Darmstadt 64291, Germany
| | - A Obertelli
- Institut für Kernphysik, Technische Universität Darmstadt , Darmstadt 64289, Germany
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF) , Darmstadt 64291, Germany
| | - V Panin
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1 , Darmstadt 64291, Germany
| | | | - R Roth
- Institut für Kernphysik, Technische Universität Darmstadt , Darmstadt 64289, Germany
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF) , Darmstadt 64291, Germany
| | - J Stroth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1 , Darmstadt 64291, Germany
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF) , Darmstadt 64291, Germany
- Institut für Kernphysik, Johann Wolfgang Goethe-Universität , Frankfurt 60438, Germany
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Francheteau A, Gaudefroy L, Scamps G, Roig O, Méot V, Ebran A, Bélier G. Scission Deformation of the ^{120}Cd/^{132}Sn Neutronless Fragmentation in ^{252}Cf(sf). PHYSICAL REVIEW LETTERS 2024; 132:142501. [PMID: 38640393 DOI: 10.1103/physrevlett.132.142501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/29/2024] [Indexed: 04/21/2024]
Abstract
We report on a study of the radiative decay of fission fragments populated via neutronless fission of ^{252}Cf(sf). Applying the double-energy method a perfect mass identification is achieved for these rare events. In the specific case of the ^{120}Cd/^{132}Sn cold fragmentation, we find that ^{132}Sn is produced in its ground state. We can therefore directly measure the excitation energy of the complementary fragment, ^{120}Cd. The reproduction of the γ-ray spectrum, measured in coincidence with the neutronless fission events, is sensitive to the angular momentum distribution of the studied primary fragment. The latter estimated using a time-dependent collective Hamiltonian model, allows us to constrain for the first time the deformation (β_{2}≃0.4) of the studied fission fragment at scission. The present work demonstrates the high potential of the understudied neutronless fission channel for extracting detailed information on both fission fragments and process.
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Affiliation(s)
- A Francheteau
- CEA, DAM, DIF, 91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - L Gaudefroy
- CEA, DAM, DIF, 91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - G Scamps
- Laboratoire des 2 Infinis-Toulouse (L2IT-IN2P3), Université de Toulouse, CNRS, UPS, F-31062 Toulouse Cedex 9, France
| | - O Roig
- CEA, DAM, DIF, 91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - V Méot
- CEA, DAM, DIF, 91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - A Ebran
- CEA, DAM, DIF, 91297 Arpajon, France
| | - G Bélier
- CEA, DAM, DIF, 91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
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Naik H, Singh RJ, Jang W, Dange SP. Post-Neutron Mass Yield Distribution in the Epi-Cadmium Neutron-Induced Fission of 245Cm. NUCL SCI ENG 2023. [DOI: 10.1080/00295639.2022.2153577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400085, India
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu 41566, Korea
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400085, India
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4
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Naik H, Singh RJ, Dange SP, Jang W. Post-Neutron Mass Yield Distribution in the Epi-Cadmium Neutron Induced Fission of 229Th. NUCL SCI ENG 2023. [DOI: 10.1080/00295639.2022.2150029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu 41566, Korea
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5
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Naik H, Dange SP, Singh RJ, Jang W. Post-Neutron Mass Yield Distribution in the Thermal Neutron Induced Fission of 233U. NUCL SCI ENG 2023. [DOI: 10.1080/00295639.2022.2142433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai, 400085, India
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai, 400085, India
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai, 400085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu, 41566, Korea
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Naik H, Dange SP, Singh RJ, Jang W. Post-Neutron Mass Yield Distribution in the Thermal Neutron Induced Fission of 235U. NUCL SCI ENG 2022. [DOI: 10.1080/00295639.2022.2133947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu 41566, Korea
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Naik H, Singh RJ, Jang W. Post-Neutron Fission Product Yield Distribution in the Spontaneous Fission of 244Cm. NUCL SCI ENG 2022. [DOI: 10.1080/00295639.2022.2103345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai - 400 085, India
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai - 400 085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu 41566, Korea
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Ren ZX, Vretenar D, Nikšić T, Zhao PW, Zhao J, Meng J. Dynamical Synthesis of ^{4}He in the Scission Phase of Nuclear Fission. PHYSICAL REVIEW LETTERS 2022; 128:172501. [PMID: 35570452 DOI: 10.1103/physrevlett.128.172501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 02/11/2022] [Accepted: 04/08/2022] [Indexed: 06/15/2023]
Abstract
In the exothermic process of fission decay, an atomic nucleus splits into two or more independent fragments. Several aspects of nuclear fission are not properly understood, in particular the formation of the neck between the nascent fragments, and the subsequent mechanism of scission into two or more independent fragments. Using an implementation of time-dependent density functional theory, based on a relativistic energy density functional and including pairing correlations, we analyze the final phase of the process of induced fission of ^{240}Pu, and show that the timescale of neck formation coincides with the assembly of two α-like clusters. Because of its much larger binding energy, the dynamical synthesis of ^{4}He in the neck predominates over other light clusters, e.g., ^{3}H and ^{6}He. At the instant of scission the neck ruptures exactly between the two α-like clusters, which separate because of the Coulomb repulsion and are eventually absorbed by the two emerging fragments. The mechanism of light charged clusters formation at scission could also be linked to ternary fission.
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Affiliation(s)
- Z X Ren
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - D Vretenar
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- Physics Department, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
| | - T Nikšić
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- Physics Department, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
| | - P W Zhao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J Zhao
- Center for Circuits and Systems, Peng Cheng Laboratory, Shenzhen 518055, China
| | - J Meng
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
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Naik H, Dange SP, Jang W, Singh RJ. Post-Neutron Mass Yield Distribution in the Epi-Cadmium Neutron-Induced Fission 241 Am. NUCL SCI ENG 2022. [DOI: 10.1080/00295639.2022.2038529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai, 400 085, India
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai, 400 085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu, 41566, Korea
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai, 400 085, India
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Naik H, Dange SP, Singh RJ, Jang W. Post-Neutron Mass Yield Distribution in the Thermal Neutron Induced–Fission of 239Pu. NUCL SCI ENG 2022. [DOI: 10.1080/00295639.2021.2025298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu 41566, Korea
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Naik H, Singh R, Dange S, Jang W. Post-neutron mass yield distribution in the epi-cadmium neutron induced fission of 99.9997 atom % 238U. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Naik H, Dange SP, Jang W, Singh RJ. Post-Neutron Mass Yield Distribution in the Epi-Cadmium Neutron-Induced Fission of 237Np. NUCL SCI ENG 2021. [DOI: 10.1080/00295639.2021.1951078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- H. Naik
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - S. P. Dange
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
| | - W. Jang
- Kyungpook National University, Department of Physics, Daegu 41566, Korea
| | - R. J. Singh
- Bhabha Atomic Research Centre, Radiochemistry Division, Mumbai 400 085, India
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13
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Bulgac A, Abdurrahman I, Jin S, Godbey K, Schunck N, Stetcu I. Fission Fragment Intrinsic Spins and Their Correlations. PHYSICAL REVIEW LETTERS 2021; 126:142502. [PMID: 33891453 DOI: 10.1103/physrevlett.126.142502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 02/05/2021] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
The intrinsic spins and their correlations are the least understood characteristics of fission fragments from both theoretical and experimental points of view. In many nuclear reactions, the emerging fragments are typically excited and acquire an intrinsic excitation energy and an intrinsic spin depending on the type of the reactions and interaction mechanism. Both the intrinsic excitation energies and the fragments' intrinsic spins and parities are controlled by the interaction mechanism and conservations laws, which lead to their correlations and determines the character of their deexcitation mechanism. We outline here a framework for the theoretical extraction of the intrinsic spin distributions of the fragments and their correlations within the fully microscopic real-time density-functional theory formalism and illustrate it on the example of induced fission of ^{236}U and ^{240}Pu, using two nuclear energy density functionals. These fission fragment intrinsic spin distributions display new qualitative features previously not discussed in literature. Within this fully microscopic framework, we extract for the first time the intrinsic spin distributions of fission fragments of ^{236}U and ^{240}Pu as well as the correlations of their intrinsic spins, which have been debated in literature for more than six decades with no definite conclusions so far.
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Affiliation(s)
- Aurel Bulgac
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
| | - Ibrahim Abdurrahman
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
| | - Shi Jin
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
| | - Kyle Godbey
- Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
| | - Nicolas Schunck
- Lawrence Livermore National Laboratory, Nuclear and Chemical and Sciences Division, Livermore, California 94551, USA
| | - Ionel Stetcu
- Los Alamos National Laboratory, Theoretical Division, Los Alamos, New Mexico 87545, USA
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14
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Schmidt KH, Estienne M, Fallot M, Jurado B, Schmitt C. Structural effects in the production of neutrons, gammas and anti-neutrinos in fission. EPJ WEB OF CONFERENCES 2021. [DOI: 10.1051/epjconf/202125600015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Structural effects in the production of light particles in fission are investigated. Most of these effects can be traced back to pairing correlations and shell effects and their dependencies on the composition of the fissioning system and its excitation energy. It is shown that the GEF code is able to reproduce most of these features and to explain their origin on the basis of established properties of nuclear matter as well as concepts and laws of general validity. Predictions for systems with scarce or no experimental information can also be made.
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Stetcu I, Bulgac A, Jin S, Roche KJ, Schunck N. Fission in a microscopic framework: From basic science to support for applications. EPJ WEB OF CONFERENCES 2021. [DOI: 10.1051/epjconf/202125600016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Recent developments, both in theoretical modeling and computational power, have allowed us to make progress on a goal not fully achieved yet in nuclear theory: a microscopic theory of nuclear fission. Even if the complete microscopic description remains a computationally demanding task, the information that can be provided by current calculations can be extremely useful to guide and constrain more phenomenological approaches, which are simpler to implement. First, a microscopic model that describes the real-time dynamics of the fissioning system can justify or rule out some of the approximations. Second, the microscopic approach can be used to obtain trends, e.g., with increasing excitation energy of the fissioning system, or even to compute observables that cannot be otherwise calculated in phenomenological approaches or that can be hindered by the limitations of the method. We briefly present in this contribution the time-dependent superfluid local density approximation (TDSLDA) approach to nuclear fission, approach that has become a very successful theoretical model in many areas of many-body research. The TDSLDA incorporates the effects of the continuum, the dynamics of the pairing field, and the numerical solution is implemented with controlled approximations and negligible numerical errors. The main part of the current contribution will be dedicated to discussing the method, and recent results concerning the fission dynamics. In addition, we present results on the excitation energy sharing between the fragments, which are in agreement with a qualitative conclusions extracted from a limited number of experimental measurements of properties of prompt neutrons.
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Chatillon A, Taïeb J, Alvarez-Pol H, Audouin L, Ayyad Y, Bélier G, Benlliure J, Boutoux G, Caamaño M, Casarejos E, Cortina-Gil D, Ebran A, Farget F, Fernández-Domínguez B, Gorbinet T, Grente L, Heinz A, Johansson HT, Jurado B, Kelić-Heil A, Kurz N, Laurent B, Martin JF, Nociforo C, Paradela C, Pellereau E, Pietri S, Prochazka A, Rodríguez-Sánchez JL, Rossi D, Simon H, Tassan-Got L, Vargas J, Voss B, Weick H. Evidence for a New Compact Symmetric Fission Mode in Light Thorium Isotopes. PHYSICAL REVIEW LETTERS 2020; 124:202502. [PMID: 32501052 DOI: 10.1103/physrevlett.124.202502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 03/16/2020] [Accepted: 05/08/2020] [Indexed: 06/11/2023]
Abstract
Taking benefit of the R3B/SOFIA setup to measure the mass and the nuclear charge of both fission fragments in coincidence with the total prompt-neutron multiplicity, the scission configurations are inferred along the thorium chain, from the asymmetric fission in the heavier isotopes to the symmetric fission in the neutron-deficient thorium. Against all expectations, the symmetric scission in the light thorium isotopes shows a compact configuration, which is in total contrast to what is known in the fission of the heavier thorium isotopes and heavier actinides. This new main symmetric scission mode is characterized by a significant drop in deformation energy of the fission fragments of about 19 MeV, compared to the well-known symmetric scission in the uranium-plutonium region.
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Affiliation(s)
- A Chatillon
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - J Taïeb
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - H Alvarez-Pol
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - L Audouin
- CNRS, IPN Orsay, F-91406 Orsay, France
| | - Y Ayyad
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - G Bélier
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - J Benlliure
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - G Boutoux
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - M Caamaño
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | | | - D Cortina-Gil
- University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - A Ebran
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | - F Farget
- CNRS, GANIL, Bd H. Becquerel, 14076 Caen, France
| | | | | | - L Grente
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - A Heinz
- Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - H T Johansson
- Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - B Jurado
- CNRS, CENBG, F-33175 Gradignan, France
| | - A Kelić-Heil
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - N Kurz
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - B Laurent
- CEA, DAM, DIF, F-91297 Arpajon, France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
| | | | - C Nociforo
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - C Paradela
- University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | | | - S Pietri
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - A Prochazka
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | | | - D Rossi
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - H Simon
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | | | - J Vargas
- University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - B Voss
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - H Weick
- GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
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Chiba S, Usang MD, Ishizuka C, Ivanyuk F, Xuan Z. Correlated transitions in symmetric and dominant fission modes, and multipole moments of fission fragments. EPJ WEB OF CONFERENCES 2020. [DOI: 10.1051/epjconf/202024203004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Systematic and anomalous trends in fragment mass and TKE (total kinetic energy) distributions are investigated in terms of 4D Langevin model developed at Tokyo Tech. We have found that correlated transitions in symmetric components and dominant modes (symmetric v.s. asymmetric) can explain the prominent systematic and anomalous features of fission observables. We have also elucidated that interplay between spherical and deformed magicity at A=132 and A=142 to 144 is important in both observables.
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Wang ZA, Pei J, Liu Y, Qiang Y. Bayesian Evaluation of Incomplete Fission Yields. PHYSICAL REVIEW LETTERS 2019; 123:122501. [PMID: 31633953 DOI: 10.1103/physrevlett.123.122501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/16/2019] [Indexed: 06/10/2023]
Abstract
Fission product yields are key infrastructure data for nuclear applications in many aspects. It is a challenge both experimentally and theoretically to obtain accurate and complete energy-dependent fission yields. We apply the Bayesian neural network (BNN) approach to learn existing fission yields and predict unknowns with uncertainty quantification. We demonstrated that the BNN is particularly useful for evaluations of fission yields when incomplete experimental data are available. The BNN evaluation results are quite satisfactory on distribution positions and energy dependencies of fission yields.
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Affiliation(s)
- Zi-Ao Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Junchen Pei
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Yue Liu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Yu Qiang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
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Ramos D, Caamaño M, Lemasson A, Rejmund M, Audouin L, Álvarez-Pol H, Frankland JD, Fernández-Domínguez B, Galiana-Baldó E, Piot J, Ackermann D, Biswas S, Clement E, Durand D, Farget F, Fregeau MO, Galaviz D, Heinz A, Henriques AI, Jacquot B, Jurado B, Kim YH, Morfouace P, Ralet D, Roger T, Schmitt C, Teubig P, Tsekhanovich I. First Direct Measurement of Isotopic Fission-Fragment Yields of ^{239}U. PHYSICAL REVIEW LETTERS 2019; 123:092503. [PMID: 31524478 DOI: 10.1103/physrevlett.123.092503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Indexed: 06/10/2023]
Abstract
A direct and complete measurement of isotopic fission-fragment yields of ^{239}U has been performed for the first time. The ^{239}U fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a ^{238}U beam and a ^{9}Be target at Coulomb barrier energies. The fission fragments were detected and isotopically identified using the VAMOS++ spectrometer at the GANIL facility. The measurement allows us to directly evaluate the fission models at excitation energies of fast neutrons, which are relevant for next-generation nuclear reactors. The present data, in agreement with model calculations, do not support the recently reported anomaly in the fission-fragment yields of ^{239}U, and they confirm the persistence of spherical shell effects in the Sn region at excitation energies exceeding the fission barrier by a few mega-electron volts.
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Affiliation(s)
- D Ramos
- IPN Orsay, Université de Paris-Saclay, CNRS/IN2P3, F-91406 Orsay Cedex, France
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - M Caamaño
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
| | - A Lemasson
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - M Rejmund
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - L Audouin
- IPN Orsay, Université de Paris-Saclay, CNRS/IN2P3, F-91406 Orsay Cedex, France
| | - H Álvarez-Pol
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
| | - J D Frankland
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - B Fernández-Domínguez
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
| | - E Galiana-Baldó
- IGFAE, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
- LIP Lisboa, 1649-003 Lisbon, Portugal
| | - J Piot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Ackermann
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - S Biswas
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - E Clement
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Durand
- LPC Caen, Université de Caen Basse-Normandie-ENSICAEN-CNRS/IN2P3, F-14050 Caen Cedex, France
| | - F Farget
- LPC Caen, Université de Caen Basse-Normandie-ENSICAEN-CNRS/IN2P3, F-14050 Caen Cedex, France
| | - M O Fregeau
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Galaviz
- LIP Lisboa, 1649-003 Lisbon, Portugal
| | - A Heinz
- Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - A I Henriques
- CENBG, IN2P3/CNRS-Université de Bordeaux, F-33175 Gradignan Cedex, France
| | - B Jacquot
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - B Jurado
- CENBG, IN2P3/CNRS-Université de Bordeaux, F-33175 Gradignan Cedex, France
| | - Y H Kim
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - P Morfouace
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - D Ralet
- CSNSM, CNRS/IN2P3, Université de Paris-Saclay, F-91405 Orsay, France
| | - T Roger
- GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5, France
| | - C Schmitt
- IPHC Strasbourg, Université de Strasbourg-CNRS/IN2P3, F-67037 Strasbourg Cedex 2, France
| | - P Teubig
- LIP Lisboa, 1649-003 Lisbon, Portugal
| | - I Tsekhanovich
- CENBG, IN2P3/CNRS-Université de Bordeaux, F-33175 Gradignan Cedex, France
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