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Title: New low-energy 0 + state and shape coexistence in Ni 70

Abstract

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 Ni-68, 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 (0(2)(+)) state at an energy of 1567 keV has been discovered in Ni-70 by using beta-delayed, gamma-ray spectroscopy following the decay of Co-70. The precipitous drop in the energy of the prolate-deformed 0(+) level between Ni-68 and Ni-70 with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large fpg(9/2)d(5/2) model space, which predict a 0(2)(+) state at 1525 keV in Ni-70. The result extends the shape-coexistence picture in the region to Ni-70 and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1391886
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 6; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

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., and Zhu, S. New low-energy 0+ state and shape coexistence in Ni70. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.92.061302.
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. New low-energy 0+ state and shape coexistence in Ni70. United States. doi:10.1103/PhysRevC.92.061302.
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., and Zhu, S. Tue . "New low-energy 0+ state and shape coexistence in Ni70". United States. doi:10.1103/PhysRevC.92.061302.
@article{osti_1391886,
title = {New low-energy 0+ state and shape coexistence in Ni70},
author = {Prokop, C. J. and Crider, B. P. and Liddick, S. N. and Ayangeakaa, A. D. and Carpenter, M. P. and Carroll, J. J. and Chen, J. and Chiara, C. J. and David, H. M. and Dombos, A. C. and Go, S. and Harker, J. and Janssens, R. V. F. and Larson, N. and Lauritsen, T. and Lewis, R. and Quinn, S. J. and Recchia, F. and Seweryniak, D. and Spyrou, A. and Suchyta, S. and Walters, W. B. and Zhu, S.},
abstractNote = {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 Ni-68, 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 (0(2)(+)) state at an energy of 1567 keV has been discovered in Ni-70 by using beta-delayed, gamma-ray spectroscopy following the decay of Co-70. The precipitous drop in the energy of the prolate-deformed 0(+) level between Ni-68 and Ni-70 with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large fpg(9/2)d(5/2) model space, which predict a 0(2)(+) state at 1525 keV in Ni-70. The result extends the shape-coexistence picture in the region to Ni-70 and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.},
doi = {10.1103/PhysRevC.92.061302},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 92,
place = {United States},
year = {2015},
month = {12}
}

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