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Identification of a millisecond isomeric state in $$^{129}$$Cd$$_{81}$$ via the detection of internal conversion and Compton electrons

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

The decay of an isomeric state in the neutron-rich nucleus $$^{129}$$Cd was observed via the detection of internal conversion and Compton electrons. This measurement provided the first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a $$^{238}$$U beam at the RIBF facility at RIKEN. From the measured yields of $$gamma$$ rays and internal conversion electrons, E3 multipolarity was tentatively assigned to the isomeric transition. A half-life of 3.6(2) ms was determined for this new state which, by comparison with shell-model calculations, was tentatively assigned a spin of (21/2$$^+$$).

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