Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.152501
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Funding
- Rare Isotope Science Project
- MSIP
- NRF of Korea
- Priority Centers Research Program in Korea [2009-0093817]
- OTKA [K100835]
- U.S. Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]
- Spanish Ministerio de Ciencia e Innovacion [FPA2009-13377-C02, FPA2011-29854-C04]
- JSPS KAKENHI [24740188]
- STFC [ST/J000051/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000051/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [24740188, 11F01752, 25247045] Funding Source: KAKEN
- National Research Foundation of Korea [2013M7A1A1075765, 2009-0093817] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The level structures of the very neutron-rich nuclei Pd-128 and Pd-126 have been investigated for the first time. In the r-process waiting-point nucleus Pd-128, a new isomer with a half-life of 5.8(8) mu s is proposed to have a spin and parity of 8(+) and is associated with a maximally aligned configuration arising from the g(9/2) proton subshell with seniority v = 2. For Pd-126, two new isomers have been identified with half-lives of 0.33(4) and 0.44(3) mu s. The yrast 2(+) energy is much higher in Pd-128 than in Pd-126, while the level sequence below the 8(+) isomer in Pd-128 is similar to that in the N = 82 isotone Cd-130. The electric quadrupole transition that depopulates the 8(+) isomer in Pd-128 is more hindered than the corresponding transition in Cd-130, as expected in the seniority scheme for a semimagic, spherical nucleus. These experimental findings indicate that the shell closure at the neutron number N = 82 is fairly robust in the neutron-rich Pd isotopes.
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