Structure of Nd 155 and Gd 163 from Cf 252 spontaneous fission

Eldridge, J. M.; Wang, E. H.; Zachary, C. J.; Hamilton, J. H.; Musangu, B. M.; Ramayya, A. V.; Ter-Akopian, G. M.; Oganessian, Yu. Ts.; Luo, Y. X.; Rasmussen, J. O.; Zhu, S. J.

doi:10.1103/physrevc.102.044323

Structure of ${}^{155}{Nd}$ and ${}^{163}{Gd}$ from ${}^{252}{Cf}$ spontaneous fission

Journal Article · Mon Oct 26 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.044323· OSTI ID:1686145

^[1]; ^[2]; ^[2]; Hamilton, J. H. ^[2]; ^[2]; Ramayya, A. V. ^[2]; ^[3]; Oganessian, Yu. Ts. ^[3]; ^[4]; Rasmussen, J. O. ^[4]; Zhu, S. J. ^[5]

Vanderbilt Univ., Nashville, TN (United States); Vanderbilt University at time of research, currently University of California Riverside
Vanderbilt Univ., Nashville, TN (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Tsinghua Univ., Beijing (China)

Background: A puzzle has arisen recently caused by the apparent shift in maximum deformation from the expected ⁶⁶Dy isotopic chain to the Nd₆₀ isotopic chain in the 82155Nd and ¹⁶³Gd, useful for constraining parameters in models that seek to answer the six proton shift in maximum deformation. Method: Data from the spontaneous fission of ²⁵²Cf were taken by the Gammasphere detector array at Lawrence Berkeley National Laboratory to observe the excited states of ¹⁵⁵Nd and ¹⁶³Gd. Results: The structure of ¹⁶³Gd has been expanded with the addition of two new levels and three new γ rays, which are found to be consistent with previously published calculations and the structure of ¹⁶⁵Dy. In ¹⁵⁵Nd, nine new levels and 12 new γ rays are observed. The spins and parities of the previously known levels in ¹⁵⁵Nd have been reassigned from a ν3/2^-[521] ground state configuration to a ν5/2⁺[642] isomeric configuration by comparison of these newly observed levels with levels in ¹⁵³Nd and ¹⁵⁵Sm. Conclusion: Further experimentation is required to determine the energy of the newly reassigned ν5/2+[642] level in ¹⁵⁵Nd with respect to the suspected ν3/2-[521] ground state. Additionally, more experiments should be conducted to further determine the structure of neutron rich nuclei, rarely produced in the spontaneous fission of ²⁵²Cf, such as ¹⁶³Gd.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); Russian Federation for Basic Research; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC03-76SF00098; FG02-88ER40407; FG05-88ER40407

OSTI ID:: 1686145

Alternate ID(s):: OSTI ID: 1809139

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 102; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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