Physics Letters B (Jul 2022)
The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry
- A. Vitéz-Sveiczer,
- A. Algora,
- A.I. Morales,
- B. Rubio,
- G.G. Kiss,
- P. Sarriguren,
- P. Van Isacker,
- G. de Angelis,
- F. Recchia,
- S. Nishimura,
- J. Agramunt,
- V. Guadilla,
- A. Montaner-Pizá,
- S.E.A. Orrigo,
- A. Horváth,
- D. Napoli,
- S. Lenzi,
- A. Boso,
- V.H. Phong,
- J. Wu,
- P.-A. Söderström,
- T. Sumikama,
- H. Suzuki,
- H. Takeda,
- D.S. Ahn,
- H. Baba,
- P. Doornebal,
- N. Fukuda,
- N. Inabe,
- T. Isobe,
- T. Kubo,
- S. Kubono,
- H. Sakurai,
- Y. Shimizu,
- C. Sidong,
- B. Blank,
- P. Ascher,
- M. Gerbaux,
- T. Goigoux,
- J. Giovinazzo,
- S. Grévy,
- T. Kurtukián Nieto,
- C. Magron,
- W. Gelletly,
- Zs. Dombrádi,
- Y. Fujita,
- M. Tanaka,
- P. Aguilera,
- F. Molina,
- J. Eberth,
- F. Diel,
- D. Lubos,
- C. Borcea,
- E. Ganioglu,
- D. Nishimura,
- H. Oikawa,
- Y. Takei,
- S. Yagi,
- W. Korten,
- G. de France,
- P. Davies,
- J. Liu,
- J. Lee,
- T. Lokotko,
- I. Kojouharov,
- N. Kurz,
- H. Shaffner,
- A. Petrovici
Affiliations
- A. Vitéz-Sveiczer
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain; Institute for Nuclear Research (Atomki), H-4001 Debrecen, Hungary; University of Debrecen, PhD school of Physics, H-4026, Debrecen, Hungary
- A. Algora
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain; Institute for Nuclear Research (Atomki), H-4001 Debrecen, Hungary
- A.I. Morales
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain
- B. Rubio
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain
- G.G. Kiss
- Institute for Nuclear Research (Atomki), H-4001 Debrecen, Hungary; RIKEN Nishina Center, Wako, Saitama 351-0198, Japan; Corresponding author.
- P. Sarriguren
- Instituto de Estructura de la Materia, IEM-CSIC, E-28006 Madrid, Spain
- P. Van Isacker
- Grand Accélérateur National d'Ions Lourds, CEA/DRF-CNRS/IN2P3, Bd Henri Becquerel, F-14076 Caen, France
- G. de Angelis
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy
- F. Recchia
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova I-35131, Italy; Dipartimento di Fisica dell Universitá degli Studi di Padova, Padova I-35131, Italy
- S. Nishimura
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- J. Agramunt
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain
- V. Guadilla
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain
- A. Montaner-Pizá
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain
- S.E.A. Orrigo
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain
- A. Horváth
- Eötvös Loránd University, Institute of Physics, H-1053 Budapest, Hungary
- D. Napoli
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy
- S. Lenzi
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova I-35131, Italy; Dipartimento di Fisica dell Universitá degli Studi di Padova, Padova I-35131, Italy
- A. Boso
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova I-35131, Italy; Dipartimento di Fisica dell Universitá degli Studi di Padova, Padova I-35131, Italy
- V.H. Phong
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan; Faculty of Physics, VNU Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
- J. Wu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- P.-A. Söderström
- Extreme Light Infrastructure-Nuclear Physics (ELI-NP) & Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Str. Reactorului 30, Bucharest-Măgurele 077125, Romania
- T. Sumikama
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- H. Suzuki
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- H. Takeda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- D.S. Ahn
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- H. Baba
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- P. Doornebal
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- N. Fukuda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- N. Inabe
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- T. Isobe
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- T. Kubo
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- S. Kubono
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- H. Sakurai
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Y. Shimizu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- C. Sidong
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- B. Blank
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- P. Ascher
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- M. Gerbaux
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- T. Goigoux
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- J. Giovinazzo
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- S. Grévy
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- T. Kurtukián Nieto
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- C. Magron
- Centre d Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797 Université de Bordeaux CNRS/IN2P3, 19 Chemin du Solarium, CS10120, 33175 Gradignan Cedex, France
- W. Gelletly
- Instituto de Fisica Corpuscular, CSIC-Universitat de Valéncia, E-46071 Valéncia, Spain; Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- Zs. Dombrádi
- Institute for Nuclear Research (Atomki), H-4001 Debrecen, Hungary
- Y. Fujita
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan; Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
- M. Tanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
- P. Aguilera
- Centro de Investigación en Física Nuclear y Espectroscopia de Neutrones CEFNEN, Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, Las Condes, Santiago, Chile
- F. Molina
- Centro de Investigación en Física Nuclear y Espectroscopia de Neutrones CEFNEN, Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, Las Condes, Santiago, Chile
- J. Eberth
- Institute of Nuclear Physics, University of Cologne, D-50937 Cologne, Germany
- 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
- C. Borcea
- National Institute for Physics and Nuclear Engineering IFIN-HH, P.O. Box MG-6, Bucharest-Magurele, Romania
- E. Ganioglu
- Department of Physics, Istanbul University, Istanbul 34134, Turkey
- D. Nishimura
- Department of Natural Sciences, Tokyo City University, Setagaya-ku, Tokyo 158-8557, 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
- W. Korten
- CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France
- G. de France
- Grand Accélérateur National d Ions Lourds, B.P. 55027, F-14076 Caen Cedex 05, France
- P. Davies
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
- J. Liu
- Department of Physics, University of Hong Kong, Pokfulam, Hong Kong
- J. Lee
- Department of Physics, University of Hong Kong, Pokfulam, Hong Kong
- T. Lokotko
- Department of Physics, University of Hong Kong, Pokfulam, Hong Kong
- I. Kojouharov
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
- N. Kurz
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
- H. Shaffner
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
- A. Petrovici
- National Institute for Physics and Nuclear Engineering IFIN-HH, P.O. Box MG-6, Bucharest-Magurele, Romania
- Journal volume & issue
-
Vol. 830
p. 137123
Abstract
The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.
