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Report No.

$$gamma$$ decay of unbound neutron-hole states in $$^{133}$$Sn

Vaquero, V.*; Jungclaus, A.*; Doornenbal, P.*; Wimmer, K.*; Gargano, A.*; Tostevin, J. A.*; Chen, S.*; N$'a$cher, E.*; Sahin, E.*; Shiga, Yoshiaki*; Steppenbeck, D.*; Taniuchi, R.*; Xu, Z. Y.*; Ando, T.*; Baba, T.*; Bello Garrote, F. L.*; Franchoo, S.*; Hady$'n$ska-Kl$c{e}$k, K.*; Kusoglu, A.*; Liu, J.*; Lokotko, T.*; Momiyama, S.*; Motobayashi, Toru*; Nagamine, S.*; Nakatsuka, Noritsugu*; Niikura, Megumi*; Orlandi, R.  ; Saito, T.*; Sakurai, H.*; S$"o$derstr$"o$m, P. A.*; Tveten, G. M.*; Vajta, Zs.*; Yalcinkaya, M.*

Excited states in $$^{133}$$Sn were populated following one-neutron knockout reaction from an unstable $$^{134}$$Sn beam at the RIBF laboratory in RIKEN. In addition to the already known $$gamma$$ rays, additional $$gamma$$ strength was observed for the first time in the excitation-energy range 3.5-5.5 MeV. Since the neutron separation energy of $$^{133}$$Sn is low, this observation provides direct evidence for the radioactive decay of neutron-unbound states in this nucleus. The ability of $$gamma$$ decay to compete with neutron emission was attributed to a mismatch between the wave functions of the initial and final states in the neutron emission case. These findings suggest that in the region south-east of $$^{132}$$Sn, nuclear structure effects play a significant role in the decay of unbound states, which are instead usually ignored in the evaluation of neutron-emission probabilities in astrophysical simulations.



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Category:Physics, Multidisciplinary



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