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Report No.

Monopole-driven shell evolution below the doubly magic nucleus $$^{132}$$Sn explored with the long-lived isomer in $$^{126}$$Pd

Watanabe, H.*; Lorusso, G.*; Nishimura, Shunji*; Otsuka, T.*; Ogawa, K.*; Xu, Z. Y.*; Sumikama, Toshiyuki*; S$"o$derstr$"o$m, P.-A.*; Doornenbal, P.*; Li, Z.*; Browne, F.*; Gey, G.*; Jung, H. S.*; Taprogge, J.*; Vajta, Zs.*; Wu, J.*; Yagi, A.*; Baba, Hidetada*; Benzoni, G.*; Chae, K. Y.*; Crespi, F. C. L.*; Fukuda, Naoki*; Gernh$"a$user, R.*; Inabe, Naoto*; Isobe, T.*; Jungclaus, A.*; Kameda, Daisuke*; Kim, G. D.*; Kim, Y.-K.*; Kojouharov, I.*; Kondev, F. G.*; Kubo, Toshiyuki*; Kurz, N.*; Kwon, Y. K.*; Lane, G. J.*; Moon, C.-B.*; Montaner-Piz$'a$, A.*; Moschner, K.*; Naqvi, F.*; Niikura, Megumi*; Nishibata, Hiroki*; Nishimura, Daiki*; Odahara, Atsuko*; Orlandi, R.; Patel, Z.*; Podoly$'a$k, Zs.*; Sakurai, Hiroyoshi*; Schaffner, H.*; Simpson, G. S.*; Steiger, K.*; Suzuki, H.*; Takeda, H.*; Wendt, A.*; Yoshinaga, Kenta*

A new isomer with a half-life of 23.0(8) ms has been identified in $$^{126}$$Pd at 2406 keV excitation. The proposed spin and parity configuration is 10$$^{+}$$, with maximally aligned configuration of two $$h$$$$_{11/2}$$ neutron hole. $$beta$$-decay from the long-lived isomer was also observed to populated excited states at high spins in $$^{126}$$Ag. The small energy difference between the 10$$^{+}$$ and 7$$^{-}$$ isomers in $$^{126}$$Pd was interpreted in the frame of the monopole shift of the 1$$h$$$$_{11/2}$$ neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below $$^{132}$$Sn are discussed in terms of central and tensor forces.



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Category:Physics, Multidisciplinary



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