Spin-trap isomers in deformed, odd-odd nuclei in the light rare-earth region near $N=98$

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Spin-trap isomers in deformed, odd-odd nuclei in the light rare-earth region near $N = 98$

R. Orford, F. G. Kondev, G. Savard, J. A. Clark, W. S. Porter, D. Ray, F. Buchinger, M. T. Burkey, D. A. Gorelov, D. J. Hartley, J. W. Klimes, K. S. Sharma, A. A. Valverde, and X. L. Yan

Phys. Rev. C 102, 011303(R) – Published 23 July 2020

Abstract

Masses of neutron-rich, odd-odd Pm, Eu, and Tb nuclei near $N = 98$ were measured using the Canadian Penning Trap mass spectrometer at the Californium Rare Isotope Breeder Upgrade (CARIBU) facility. High-resolution mass measurements yielded the discovery of spin-trap isomers at $N = 97$ in ${}^{162}{Tb}$ , and in the $N = 99$ isotones of ${}^{160}{Pm}$ and ${}^{164}{Tb}$ . Furthermore, no evidence of long-lived isomers were observed at $N = 95$ in ${}^{158}{Eu}$ , at $N = 97$ in ${}^{158}{Pm}$ , nor at $N = 101$ in ${}^{164}{Eu}$ and ${}^{166}{Tb}$ . These experimental observations are compared to results from multiquasiparticle blocking calculations.

Received 6 March 2020
Accepted 30 June 2020

DOI:https://doi.org/10.1103/PhysRevC.102.011303

Physics Subject Headings (PhySH)

Isomer decays Nuclear structure & decays

150 ≤ A ≤ 189

Mass spectrometry Penning traps Radioactive beams

Nuclear Physics

Authors & Affiliations

R. Orford^1,2,*, F. G. Kondev ¹, G. Savard^1,3, J. A. Clark^1,4, W. S. Porter ^1,†, D. Ray^1,4, F. Buchinger², M. T. Burkey^1,3,‡, D. A. Gorelov ^1,4, D. J. Hartley⁵, J. W. Klimes ^1,§, K. S. Sharma ⁴, A. A. Valverde ^1,4, and X. L. Yan ^1,6

¹Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
²Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T8
³Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
⁴Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
⁵Department of Physics, U.S. Naval Academy, Annapolis, Maryland 21402, USA
⁶Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

^*Present address: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA; rorford@lbl.gov
^†Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
^‡Present address: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
^§Present address: Atomic Physics Department, GSI Helmholtz Centre for Heavy Ion Research, Darmstadt 64291, Germany; Heidelberg Graduate School for fundamental Physics, Heidelberg University, Heidelberg 69120, Germany.

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Vol. 102, Iss. 1 — July 2020

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Physical Review C

covering nuclear physics