Collectivity evolution in the neutron-rich Pd isotopes toward the N=82 shell closure

Wang, H. and Aoi, N. and Takeuchi, S. and Matsushita, M. and Doornenbal, P. and Motobayashi, T. and Steppenbeck, D. and Yoneda, K. and Baba, H. and Cáceres, L. and Dombrádi, Zsolt and Kobayashi, K. and Kondo, Y. and Lee, J. and Li, K. and Liu, H. and Minakata, R. and Nishimura, D. and Otsu, H. and Sakaguchi, S. and Sakurai, H. and Scheit, H. and Kunné Sohler, Dorottya and Sun, Y. and Tian, Z. and Tanaka, R. and Togano, Y. and Vajta, Zs. and Yang, Z. and Yamamoto, T. (2013) Collectivity evolution in the neutron-rich Pd isotopes toward the N=82 shell closure. PHYSICAL REVIEW C, 88 (5). ISSN 2469-9985

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Abstract

The neutron-rich, even-even 122,124,126Pd isotopes has been studied via in-beam γ-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+ 1 → 0 + gs decays. In addition, a candidate for the 4+ 1 state at 1164(20) keV was observed in 122Pd. The resulting Ex(2+ 1 ) 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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