Physics Letters B (Feb 2017)
Type II shell evolution in A=70 isobars from the N≥40 island of inversion
- A.I. Morales,
- G. Benzoni,
- H. Watanabe,
- Y. Tsunoda,
- T. Otsuka,
- S. Nishimura,
- F. Browne,
- R. Daido,
- P. Doornenbal,
- Y. Fang,
- G. Lorusso,
- Z. Patel,
- S. Rice,
- L. Sinclair,
- P.-A. Söderström,
- T. Sumikama,
- J. Wu,
- Z.Y. Xu,
- A. Yagi,
- R. Yokoyama,
- H. Baba,
- R. Avigo,
- F.L. Bello Garrote,
- N. Blasi,
- A. Bracco,
- F. Camera,
- S. Ceruti,
- F.C.L. Crespi,
- G. de Angelis,
- M.-C. Delattre,
- Zs. Dombradi,
- A. Gottardo,
- T. Isobe,
- I. Kojouharov,
- N. Kurz,
- I. Kuti,
- K. Matsui,
- B. Melon,
- D. Mengoni,
- T. Miyazaki,
- V. Modamio-Hoybjor,
- S. Momiyama,
- D.R. Napoli,
- M. Niikura,
- R. Orlandi,
- H. Sakurai,
- E. Sahin,
- D. Sohler,
- H. Schaffner,
- R. Taniuchi,
- J. Taprogge,
- Zs. Vajta,
- J.J. Valiente-Dobón,
- O. Wieland,
- M. Yalcinkaya
Affiliations
- A.I. Morales
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- G. Benzoni
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- H. Watanabe
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
- Y. Tsunoda
- Center for Nuclear Study, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- T. Otsuka
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- S. Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- F. Browne
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton, United Kingdom
- R. Daido
- Department of Physics, Osaka University, Osaka 560-0043, Toyonaka, Japan
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Y. Fang
- Department of Physics, Osaka University, Osaka 560-0043, Toyonaka, Japan
- G. Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Z. Patel
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- S. Rice
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- L. Sinclair
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
- P.-A. Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T. Sumikama
- Department of Physics, Tohoku University, Miyagi 980-8578, Japan
- J. Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Z.Y. Xu
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- A. Yagi
- Department of Physics, Osaka University, Osaka 560-0043, Toyonaka, Japan
- R. Yokoyama
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- H. Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- R. Avigo
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- F.L. Bello Garrote
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
- N. Blasi
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- A. Bracco
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- F. Camera
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- S. Ceruti
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- F.C.L. Crespi
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- G. de Angelis
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- M.-C. Delattre
- IPNO Orsay, 91400 Orsay, France
- Zs. Dombradi
- MTA Atomki, H-4001 Debrecen, Hungary
- A. Gottardo
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- T. Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- I. Kojouharov
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
- N. Kurz
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
- I. Kuti
- MTA Atomki, H-4001 Debrecen, Hungary
- K. Matsui
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- B. Melon
- Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, I-50019 Firenze, Italy
- D. Mengoni
- Dipartimento di Fisica, Università degli Studi di Padova, I-35131 Padova, Italy
- T. Miyazaki
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- V. Modamio-Hoybjor
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- S. Momiyama
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- D.R. Napoli
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- M. Niikura
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- R. Orlandi
- Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
- H. Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- E. Sahin
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
- D. Sohler
- MTA Atomki, H-4001 Debrecen, Hungary
- H. Schaffner
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
- R. Taniuchi
- Department of Physics, The University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
- J. Taprogge
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- Zs. Vajta
- MTA Atomki, H-4001 Debrecen, Hungary
- J.J. Valiente-Dobón
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- O. Wieland
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- M. Yalcinkaya
- Department of Physics, Istanbul University, 34134 Istanbul, Turkey
- DOI
- https://doi.org/10.1016/j.physletb.2016.12.025
- Journal volume & issue
-
Vol. 765,
no. C
pp. 328 – 333
Abstract
The level structures of 70Co and 70Ni, populated from the β decay of 70Fe, have been investigated using β-delayed γ-ray spectroscopy following in-flight fission of a 238U beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf+g9/2+d5/2 orbitals. The strong population of a (1+) state at 274 keV in 70Co is at variance with the expected excitation energy of ∼1 MeV from near spherical single-particle estimates. This observation indicates a dominance of prolate-deformed intruder configurations in the low-lying levels, which coexist with the normal near spherical states. It is shown that the β decay of the neutron-rich A=70 isobars from the new island of inversion to the Z=28 closed-shell regime progresses in accordance with a newly reported type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps.
