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American Physical Society, Physical Review Letters, 15(111)

DOI: 10.1103/physrevlett.111.152501

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Isomers inPd128andPd126: Evidence for a Robust Shell Closure at the Neutron Magic Number 82 in Exotic Palladium Isotopes

Journal article published in 2013 by H. Watanabe, G. Lorusso, S. Nishimura, Z. Y. Xu ORCID, T. Sumikama, P.-A. Söderström, P. Doornenbal, F. Browne, G. Gey, H. S. Jung, J. Taprogge, Z.-S. Vajta, A. Yagi, H. Baba ORCID, Jin Wu ORCID and other authors.
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Abstract

The level structures of the very neutron-rich nuclei ^{128}Pd and ^{126}Pd have been investigated for the first time. In the r-process waiting-point nucleus ^{128}Pd, a new isomer with a half-life of 5.8(8) μs 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 υ=2. For ^{126}Pd, two new isomers have been identified with half-lives of 0.33(4) and 0.44(3) μs. The yrast 2^{+} energy is much higher in ^{128}Pd than in ^{126}Pd, while the level sequence below the 8^{+} isomer in ^{128}Pd is similar to that in the N=82 isotone ^{130}Cd. The electric quadrupole transition that depopulates the 8^{+} isomer in ^{128}Pd is more hindered than the corresponding transition in ^{130}Cd, 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.