Collectivity evolution in the neutron-rich Pd isotopes towards the N=82 shell closure
H. Wang, N. Aoi, S. Takeuchi, M. Matsushita, P. Doornenbal, T., Motobayashi, D. Steppenbeck, K. Yoneda, H. Baba, L. Caceres, Zs. Dombradi, K., Kobayashi, Y. Kondo, J. Lee, K. Li, H. Liu, R. Minakata, D. Nishimura, H., Otsu, S. Sakaguchi, H. Sakurai, H. Scheit, D. Sohler, Y. Sun
TL;DR
This study investigates the evolution of collectivity in neutron-rich Pd isotopes near N=82 using gamma-ray spectroscopy, revealing consistent excitation patterns and no significant shell quenching.
Contribution
It provides new experimental data on excited states in Pd isotopes near N=82, supporting the persistence of shell structure in this region.
Findings
Excited states at 499, 590, and 686 keV identified in Pd isotopes.
Systematics similar to Xe isotopic chain, indicating stable shell structure.
No evidence of shell quenching near N=82 in Pd isotopes.
Abstract
The neutron-rich, even-even 122,124,126Pd isotopes has been studied via in-beam gamma-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory. Excited states at 499(9), 590(11), and 686(17) keV were found in the three isotopes, which we assign to the respective 2+ -> 0+ decays. In addition, a candidate for the 4+ state at 1164(20) keV was observed in 122Pd. The resulting Ex(2+) systematics are essentially similar to those of the Xe (Z=54) isotopic chain and theoretical prediction by IBM-2, suggesting no serious shell quenching in the Pd isotopes in the vicinity of N=82.
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