1
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Wimmer K, Korten W, Doornenbal P, Arici T, Aguilera P, Algora A, Ando T, Baba H, Blank B, Boso A, Chen S, Corsi A, Davies P, de Angelis G, de France G, Delaroche JP, Doherty DT, Gerl J, Gernhäuser R, Girod M, Jenkins D, Koyama S, Motobayashi T, Nagamine S, Niikura M, Obertelli A, Libert J, Lubos D, Rodríguez TR, Rubio B, Sahin E, Saito TY, Sakurai H, Sinclair L, Steppenbeck D, Taniuchi R, Wadsworth R, Zielinska M. Shape Changes in the Mirror Nuclei ^{70}Kr and ^{70}Se. Phys Rev Lett 2021; 126:072501. [PMID: 33666458 DOI: 10.1103/physrevlett.126.072501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/25/2020] [Accepted: 01/05/2021] [Indexed: 06/12/2023]
Abstract
We studied the proton-rich T_{z}=-1 nucleus ^{70}Kr through inelastic scattering at intermediate energies in order to extract the reduced transition probability, B(E2;0^{+}→2^{+}). Comparison with the other members of the A=70 isospin triplet, ^{70}Br and ^{70}Se, studied in the same experiment, shows a 3σ deviation from the expected linearity of the electromagnetic matrix elements as a function of T_{z}. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei ^{70}Kr and ^{70}Se contrary to the model predictions.
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Affiliation(s)
- K Wimmer
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - W Korten
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Arici
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
- Justus-Liebig-Universität Giessen, D-35392 Giessen, Germany
| | - P Aguilera
- Comisión Chilena de Energía Nuclear, Casilla 188-D, Santiago, Chile
| | - A Algora
- Instituto de Fisica Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
- Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4026, Hungary
| | - T Ando
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B Blank
- CENBG, CNRS/IN2P3, Université de Bordeaux, F-33175 Gradignan, France
| | - A Boso
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
| | - S Chen
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Corsi
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - P Davies
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - G de Angelis
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - G de France
- GANIL, CEA/DSM-CNRS/IN2P3, F-14076 Caen Cedex 05, France
| | | | - D T Doherty
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - J Gerl
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - R Gernhäuser
- Physik Department, Technische Universität München, D-85748 Garching, Germany
| | - M Girod
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - D Jenkins
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - S Koyama
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Motobayashi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Nagamine
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - M Niikura
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - A Obertelli
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - J Libert
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - D Lubos
- Physik Department, Technische Universität München, D-85748 Garching, Germany
| | - T R Rodríguez
- Departamento de Física Teórica and Centro de Investigación Avanzada en Física Fundamental, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - B Rubio
- Instituto de Fisica Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - E Sahin
- Department of Physics, University of Oslo, PO Box 1048 Blindern, N-0316 Oslo, Norway
| | - T Y Saito
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - H Sakurai
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - L Sinclair
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - D Steppenbeck
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Taniuchi
- Department of Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - R Wadsworth
- Department of Physics, University of York, YO10 5DD York, United Kingdom
| | - M Zielinska
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
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2
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Wilson JN, Thisse D, Lebois M, Jovančević N, Gjestvang D, Canavan R, Rudigier M, Étasse D, Gerst RB, Gaudefroy L, Adamska E, Adsley P, Algora A, Babo M, Belvedere K, Benito J, Benzoni G, Blazhev A, Boso A, Bottoni S, Bunce M, Chakma R, Cieplicka-Oryńczak N, Courtin S, Cortés ML, Davies P, Delafosse C, Fallot M, Fornal B, Fraile L, Gottardo A, Guadilla V, Häfner G, Hauschild K, Heine M, Henrich C, Homm I, Ibrahim F, Iskra ŁW, Ivanov P, Jazrawi S, Korgul A, Koseoglou P, Kröll T, Kurtukian-Nieto T, Le Meur L, Leoni S, Ljungvall J, Lopez-Martens A, Lozeva R, Matea I, Miernik K, Nemer J, Oberstedt S, Paulsen W, Piersa M, Popovitch Y, Porzio C, Qi L, Ralet D, Regan PH, Rezynkina K, Sánchez-Tembleque V, Siem S, Schmitt C, Söderström PA, Sürder C, Tocabens G, Vedia V, Verney D, Warr N, Wasilewska B, Wiederhold J, Yavahchova M, Zeiser F, Ziliani S. Angular momentum generation in nuclear fission. Nature 2021; 590:566-570. [PMID: 33627809 DOI: 10.1038/s41586-021-03304-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 12/09/2020] [Indexed: 01/31/2023]
Abstract
When a heavy atomic nucleus splits (fission), the resulting fragments are observed to emerge spinning1; this phenomenon has been a mystery in nuclear physics for over 40 years2,3. The internal generation of typically six or seven units of angular momentum in each fragment is particularly puzzling for systems that start with zero, or almost zero, spin. There are currently no experimental observations that enable decisive discrimination between the many competing theories for the mechanism that generates the angular momentum4-12. Nevertheless, the consensus is that excitation of collective vibrational modes generates the intrinsic spin before the nucleus splits (pre-scission). Here we show that there is no significant correlation between the spins of the fragment partners, which leads us to conclude that angular momentum in fission is actually generated after the nucleus splits (post-scission). We present comprehensive data showing that the average spin is strongly mass-dependent, varying in saw-tooth distributions. We observe no notable dependence of fragment spin on the mass or charge of the partner nucleus, confirming the uncorrelated post-scission nature of the spin mechanism. To explain these observations, we propose that the collective motion of nucleons in the ruptured neck of the fissioning system generates two independent torques, analogous to the snapping of an elastic band. A parameterization based on occupation of angular momentum states according to statistical theory describes the full range of experimental data well. This insight into the role of spin in nuclear fission is not only important for the fundamental understanding and theoretical description of fission, but also has consequences for the γ-ray heating problem in nuclear reactors13,14, for the study of the structure of neutron-rich isotopes15,16, and for the synthesis and stability of super-heavy elements17,18.
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Affiliation(s)
- J N Wilson
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.
| | - D Thisse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Lebois
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Jovančević
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Gjestvang
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - R Canavan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford, UK.,Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - R-B Gerst
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | | | - E Adamska
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Adsley
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Algora
- IFIC, CSIC-University of Valencia, Valencia, Spain.,Institute for Nuclear Research (Atomki), Debrecen, Hungary
| | - M Babo
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Belvedere
- Department of Physics, University of Surrey, Guildford, UK
| | - J Benito
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | | | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - A Boso
- National Physical Laboratory, Teddington, UK
| | - S Bottoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - M Bunce
- National Physical Laboratory, Teddington, UK
| | - R Chakma
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | | | - S Courtin
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | | | - P Davies
- School of Physics and Astronomy, University of Manchester, Manchester, UK
| | - C Delafosse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Fallot
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - B Fornal
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - L Fraile
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - A Gottardo
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - V Guadilla
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - G Häfner
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.,Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - K Hauschild
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Heine
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - C Henrich
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - I Homm
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - F Ibrahim
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - Ł W Iskra
- INFN, Milan, Italy.,Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - P Ivanov
- National Physical Laboratory, Teddington, UK
| | - S Jazrawi
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - A Korgul
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Koseoglou
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,GSI Helmoltzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - T Kröll
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - L Le Meur
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - S Leoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - J Ljungvall
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Lopez-Martens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - R Lozeva
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - I Matea
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Miernik
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - J Nemer
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - S Oberstedt
- European Commission, Joint Research Centre, Geel, Belgium
| | - W Paulsen
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - M Piersa
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - Y Popovitch
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - C Porzio
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy.,TRIUMF, Vancouver, British Columbia, Canada
| | - L Qi
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Ralet
- Grand Accélérateur National d'Ions Lourds, Caen, France
| | - P H Regan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - K Rezynkina
- Institute for Nuclear and Radiation Physics, Katholieke Universiteit Leuven, Leuven, Belgium
| | - V Sánchez-Tembleque
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - S Siem
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - C Schmitt
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - P-A Söderström
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania
| | - C Sürder
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - G Tocabens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - V Vedia
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - D Verney
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - B Wasilewska
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - J Wiederhold
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - M Yavahchova
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - F Zeiser
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - S Ziliani
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
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3
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Delafosse C, Verney D, Marević P, Gottardo A, Michelagnoli C, Lemasson A, Goasduff A, Ljungvall J, Clément E, Korichi A, De Angelis G, Andreoiu C, Babo M, Boso A, Didierjean F, Dudouet J, Franchoo S, Gadea A, Georgiev G, Ibrahim F, Jacquot B, Konstantinopoulos T, Lenzi SM, Maquart G, Matea I, Mengoni D, Napoli DR, Nikšić T, Olivier L, Pérez-Vidal RM, Portail C, Recchia F, Redon N, Siciliano M, Stefan I, Stezowski O, Vretenar D, Zielinska M, Barrientos D, Benzoni G, Birkenbach B, Boston AJ, Boston HC, Cederwall B, Charles L, Ciemala M, Collado J, Cullen DM, Désesquelles P, de France G, Domingo-Pardo C, Eberth J, González V, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Korten W, Lefevre A, Legruel F, Menegazzo R, Million B, Nyberg J, Quintana B, Ralet D, Reiter P, Saillant F, Sanchis E, Theisen C, Valiente Dobon JJ. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the ^{78}Ni Region: A Hint from Lifetime Measurements. Phys Rev Lett 2018; 121:192502. [PMID: 30468583 DOI: 10.1103/physrevlett.121.192502] [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: 05/18/2018] [Revised: 08/27/2018] [Indexed: 06/09/2023]
Abstract
Lifetime measurements of excited states of the light N=52 isotones ^{88}Kr, ^{86}Se, and ^{84}Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2^{+}→0^{+}) and B(E2;4^{+}→2^{+}) were obtained for the first time for the hard-to-reach ^{84}Ge. While the B(E2;2^{+}→0^{+}) values of ^{88}Kr, ^{86}Se saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g_{7/2}, 1h_{11/2}) space of an inert ^{78}Ni core, the value obtained for ^{84}Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N≲49, extend beyond N=50. The onset of collectivity at Z=32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.
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Affiliation(s)
- C Delafosse
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - D Verney
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - P Marević
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - A Gottardo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - C Michelagnoli
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Lemasson
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Goasduff
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - J Ljungvall
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - E Clément
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Korichi
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - G De Angelis
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - C Andreoiu
- Departement of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A S16, Canada
| | - M Babo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Boso
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - F Didierjean
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - J Dudouet
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - S Franchoo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - A Gadea
- IFIC, CSIC-Universitat Valencia, Apartado Oficial 22085, 46071 Valencia, Spain
| | - G Georgiev
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - F Ibrahim
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - B Jacquot
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - T Konstantinopoulos
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - S M Lenzi
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - G Maquart
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - I Matea
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - D Mengoni
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - D R Napoli
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - T Nikšić
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
| | - L Olivier
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - R M Pérez-Vidal
- IFIC, CSIC-Universitat Valencia, Apartado Oficial 22085, 46071 Valencia, Spain
| | - C Portail
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - F Recchia
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - N Redon
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - M Siciliano
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - I Stefan
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - O Stezowski
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - D Vretenar
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
| | - M Zielinska
- CEA de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
| | | | - G Benzoni
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - B Birkenbach
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - A J Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - H C Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - B Cederwall
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - L Charles
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - M Ciemala
- The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland
| | - J Collado
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia 46100, Spain
| | - D M Cullen
- Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - P Désesquelles
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - G de France
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - C Domingo-Pardo
- IFIC, CSIC-Universitat Valencia, Apartado Oficial 22085, 46071 Valencia, Spain
| | - J Eberth
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - V González
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia 46100, Spain
| | - L J Harkness-Brennan
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - H Hess
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D S Judson
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
| | - W Korten
- CEA de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
| | - A Lefevre
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - F Legruel
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - R Menegazzo
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - B Million
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - J Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - B Quintana
- Laboratorio de Radiaciones Ionizantes, Universidad de Salamanca, E-37008 Salamanca, Spain
| | - D Ralet
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - F Saillant
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - E Sanchis
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia 46100, Spain
| | - Ch Theisen
- CEA de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
| | - J J Valiente Dobon
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
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4
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Boso A, Lenzi SM, Recchia F, Bonnard J, Zuker AP, Aydin S, Bentley MA, Cederwall B, Clement E, de France G, Di Nitto A, Dijon A, Doncel M, Ghazi-Moradi F, Gadea A, Gottardo A, Henry T, Hüyük T, Jaworski G, John PR, Juhász K, Kuti I, Melon B, Mengoni D, Michelagnoli C, Modamio V, Napoli DR, Nyakó BM, Nyberg J, Palacz M, Timár J, Valiente-Dobón JJ. Neutron Skin Effects in Mirror Energy Differences: The Case of ^{23}Mg-^{23}Na. Phys Rev Lett 2018; 121:032502. [PMID: 30085775 DOI: 10.1103/physrevlett.121.032502] [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: 04/13/2018] [Indexed: 06/08/2023]
Abstract
Energy differences between analogue states in the T=1/2 ^{23}Mg-^{23}Na mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetry-breaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f_{7/2} shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f_{7/2} shell is needed to reproduce the data. An alternative novel description, applied here for the first time, relies on the use of an effective interaction deduced from a realistic charge-dependent chiral nucleon-nucleon potential. This analysis provides two important results: (i) The mirror energy differences give direct insight into the nuclear skin; (ii) the skin changes along the rotational bands are strongly correlated with the difference between the neutron and proton occupations of the s_{1/2} "halo" orbit.
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Affiliation(s)
- A Boso
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - S M Lenzi
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - F Recchia
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - J Bonnard
- INFN, Sezione di Padova, I-35131 Padova, Italy
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - A P Zuker
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- Universitè de Strasbourg and IPHC, F-67000 Strasbourg, France
| | - S Aydin
- Aksaray Universitesi, Department of Physics, TR-68100 Aksaray, Turkey
| | - M A Bentley
- University of York, Department of Physics, YO10 5DD York, United Kingdom
| | - B Cederwall
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - E Clement
- GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen, France
| | - G de France
- GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen, France
| | - A Di Nitto
- Dipartimento di Fisica and INFN, Sezione di Napoli, I-80126 Napoli, Italy
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - A Dijon
- GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen, France
| | - M Doncel
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - F Ghazi-Moradi
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - A Gadea
- IFIC, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - A Gottardo
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - T Henry
- University of York, Department of Physics, YO10 5DD York, United Kingdom
| | - T Hüyük
- IFIC, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - G Jaworski
- Heavy Ion Laboratory, Warsaw University, 02-093 Warszawa, Poland
| | - P R John
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - K Juhász
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
| | - I Kuti
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
| | - B Melon
- Dipartimento di Fisica and INFN, Sezione di Firenze, I-50019 Firenze, Italy
| | - D Mengoni
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - C Michelagnoli
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - V Modamio
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - D R Napoli
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - B M Nyakó
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
| | - J Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - M Palacz
- Heavy Ion Laboratory, Warsaw University, 02-093 Warszawa, Poland
| | - J Timár
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
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5
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Goigoux T, Ascher P, Blank B, Gerbaux M, Giovinazzo J, Grévy S, Kurtukian Nieto T, Magron C, Doornenbal P, Kiss GG, Nishimura S, Söderström PA, Phong VH, Wu J, Ahn DS, Fukuda N, Inabe N, Kubo T, Kubono S, Sakurai H, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Agramunt J, Algora A, Guadilla V, Montaner-Piza A, Morales AI, Orrigo SEA, Rubio B, Fujita Y, Tanaka M, Gelletly W, Aguilera P, Molina F, Diel F, Lubos D, de Angelis G, Napoli D, Borcea C, Boso A, Cakirli RB, Ganioglu E, Chiba J, Nishimura D, Oikawa H, Takei Y, Yagi S, Wimmer K, de France G, Go S, Brown BA. Two-Proton Radioactivity of ^{67}Kr. Phys Rev Lett 2016; 117:162501. [PMID: 27792367 DOI: 10.1103/physrevlett.117.162501] [Citation(s) in RCA: 1] [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: 05/19/2016] [Indexed: 06/06/2023]
Abstract
In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from ^{67}Kr. At the same time, no evidence for 2p emission of ^{59}Ge and ^{63}Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to ^{67}Kr as being the best new candidate among the three for two-proton radioactivity. ^{67}Kr is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of ^{67}Kr is 7.4(30) ms.
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Affiliation(s)
- T Goigoux
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - P Ascher
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - B Blank
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - M Gerbaux
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - J Giovinazzo
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - S Grévy
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - T Kurtukian Nieto
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - C Magron
- Centre d'Études Nucléaires de Bordeaux Gradignan, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G G Kiss
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - P-A Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - V H Phong
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D S Ahn
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kubono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y Shimizu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Agramunt
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - A Algora
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
- Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O. Box 51, H-4001 Debrecen, Hungary
| | - V Guadilla
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - A Montaner-Piza
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - A I Morales
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - S E A Orrigo
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - B Rubio
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - Y Fujita
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Tanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - W Gelletly
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - P Aguilera
- Comisión Chilena de Energía Nuclear, Casilla 188-D, Amunátegui 95, Santiago Centro, Santiago, Chile
| | - F Molina
- Comisión Chilena de Energía Nuclear, Casilla 188-D, Amunátegui 95, Santiago Centro, Santiago, Chile
| | - F Diel
- Institute of Nuclear Physics, University of Cologne, D-50937 Cologne, Germany
| | - D Lubos
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - G de Angelis
- Laboratori Nazionali di Legnaro dell'INFN, I-35020 Legnaro (Padova), Italy
| | - D Napoli
- Laboratori Nazionali di Legnaro dell'INFN, I-35020 Legnaro (Padova), Italy
| | - C Borcea
- National Institute for Physics and Nuclear Engineering IFIN-HH, P.O. Box MG-6, Bucharest-Magurele, Romania
| | - A Boso
- INFN Sezione di Padova and Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy
| | - R B Cakirli
- Department of Physics, Istanbul University, Istanbul 34134, Turkey
| | - E Ganioglu
- Department of Physics, Istanbul University, Istanbul 34134, Turkey
| | - J Chiba
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - D Nishimura
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Oikawa
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - Y Takei
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - S Yagi
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - K Wimmer
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - G de France
- Grand Accélérateur National d'Ions Lourds, B.P. 55027, F-14076 Caen Cedex 05, France
| | - S Go
- Department of Physics and Astronomy, University of Tennessee, 401 Nielsen Physics Building, 1408 Circle Drive, Knoxville, Tennessee 37996-1200, USA
| | - B A Brown
- Department of Physics and Astronomy, and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
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