New low-energy 0+ state and shape coexistence in Ni70

Prokop, C. J.; Crider, B. P.; Liddick, S. N.; Ayangeakaa, A. D.; Carpenter, M. P.; Carroll, J. J.; Chen, J.; Chiara, C. J.; David, H. M.; Dombos, A. C.; Go, S.; Harker, J.; Janssens, R. V.  F.; Larson, N.; Lauritsen, T.; Lewis, R.; Quinn, S. J.; Recchia, F.; Seweryniak, D.; Spyrou, A.; Suchyta, S.; Walters, W. B.; Zhu, S.

doi:10.1103/PhysRevC.92.061302

Title: New low-energy $0^{+}$ state and shape coexistence in ${}^{70}{Ni}$

Journal Article · 20 December 2015 · Physical Review C, Nuclear Physics

DOI: https://doi.org/10.1103/PhysRevC.92.061302 · OSTI ID:1480699

Prokop, C. J. ^[1]; Crider, B. P. ^[1]; Liddick, S. N. ^[1]; Ayangeakaa, A. D. ^[2]; Carpenter, M. P. ^[2]; Carroll, J. J. ^[3]; Chen, J. ^[1]; Chiara, C. J. ^[3]; David, H. M. ^[2]; Dombos, A. C. ^[1]; Go, S. ^[4]; Harker, J. ^[5]; Janssens, R. V. F. ^[2]; Larson, N. ^[1]; Lauritsen, T. ^[2]; Lewis, R. ^[1]; Quinn, S. J. ^[1]; Recchia, F. ^[6]; Seweryniak, D. ^[2]; Spyrou, A. ^[1] more »

Michigan State Univ., East Lansing, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
U.S. Army Research Laboratory, Adelphi, MD (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
Università degli Studi di Padova (Italy)
Univ. of California, Berkeley, CA (United States)
Univ. of Maryland, College Park, MD (United States)

We report that in recent models, the neutron-rich Ni isotopes around N=40 are predicted to exhibit multiple low-energy excited 0⁺ states attributed to neutron and proton excitations across both the N=40 and Z=28 shell gaps. In ⁶⁸Ni, the three observed 0⁺ states have been interpreted in terms of triple shape coexistence between spherical, oblate, and prolate deformed shapes. In the present work a new (0₂⁺) state at an energy of 1567 keV has been discovered in ⁷⁰Ni by using β-delayed, γ-ray spectroscopy following the decay of ⁷⁰Co. The precipitous drop in the energy of the prolate-deformed 0⁺ level between ⁶⁸Ni and ⁷⁰Ni with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large f_pg9/2d_5/2 model space, which predict a 0₂⁺ state at 1525 keV in ⁷⁰Ni. Finally, the result extends the shape-coexistence picture in the region to ⁷⁰Ni and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-05CH11231; FG02-94ER40834; FG02-96ER40983; FG52-08NA28552; NA0000979; NA0002132

OSTI ID:: 1480699

Journal Information:: Physical Review C, Nuclear Physics, Journal Name: Physical Review C, Nuclear Physics Journal Issue: 6 Vol. 92; ISSN PRVCAN; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Enhanced low-energy γ -decay strength of Ni 70 and its robustness within the shell model Larsen, A. C.; Midtbø, J. E.; Guttormsen, M. Physical Review C, Vol. 97, Issue 5 https://doi.org/10.1103/physrevc.97.054329	journal	May 2018
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