Title: Isomers in Pd-128 and Pd-126: Evidence for a Robust Shell Closure at the Neutron Magic Number 82 in Exotic Palladium Isotopes
Authors: Watanabe, H ×
Lorusso, G
Nishimura, S
Xu, Z. Y
Sumikama, T
Soederstroem, P. -A
Doornenbal, P
Browne, F
Gey, G
Jung, H. S
Taprogge, J
Vajta, Zs
Wu, Jianbin
Yagi, A
Baba, H
Benzoni, G
Chae, K. Y
Crespi, F. C. L
Fukuda, N
Gernhaeuser, R
Inabe, N
Isobe, T
Jungclaus, A
Kameda, D
Kim, G. D
Kim, Y. K
Kojouharov, I
Kondev, F. G
Kubo, T
Kurz, N
Kwon, Y. K
Lane, G. J
Li, Z
Moon, C. -B
Montaner-Piza, A
Moschner, K
Naqvi, F
Niikura, M
Nishibata, H
Nishimura, D
Odahara, A
Orlandi, Riccardo
Patel, Z
Podolyak, Zs
Sakurai, H
Schaffner, H
Simpson, G. S
Steiger, K
Suzuki, H
Takeda, H
Wendt, A
Yoshinaga, K #
Issue Date: 2013
Series Title: PHYSICAL REVIEW LETTERS vol:111 issue:15 pages:1-5
Abstract: The level structures of the very neutron-rich nuclei 128Pd and 126Pd have been investigated for the first
time. In the r-process waiting-point nucleus 128Pd, a new isomer with a half-life of 5:8ð8Þ s is proposed
to have a spin and parity of 8þ and is associated with a maximally aligned configuration arising from the
g9=2 proton subshell with seniority ¼ 2. For 126Pd, two new isomers have been identified with half-lives
of 0.33(4) and 0:44ð3Þ s. The yrast 2þ energy is much higher in 128Pd than in 126Pd, while the level
sequence below the 8þ isomer in 128Pd is similar to that in the N ¼ 82 isotone 130Cd. The electric
quadrupole transition that depopulates the 8þ isomer in 128Pd is more hindered than the corresponding
transition in 130Cd, as expected in the seniority scheme for a semimagic, spherical nucleus. These
experimental findings indicate that the shell closure at the neutron number N ¼ 82 is fairly robust in the
neutron-rich Pd isotopes.
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
Research Center of Econometrics, Leuven
× corresponding author
# (joint) last author

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