Phys.Rev.Lett. 133, 072501 (2024)

T.T.Yeung, A.I.Morales, J.Wu, M.Liu, C.Yuan, S.Nishimura, V.H.Phong, N.Fukuda, J.L.Tain, T.Davinson, K.P.Rykaczewski, R.Yokoyama, T.Isobe, M.Niikura, Zs.Podolyak, G.Alcala, A.Algora, J.M.Allmond, J.Agramunt, C.Appleton, H.Baba, R.Caballero-Folch, F.Calvino, M.P.Carpenter, I.Dillmann, A.Estrade, T.Gao, C.J.Griffin, R.K.Grzywacz, O.Hall, Y.Hirayama, B.M.Hue, E.Ideguchi, G.G.Kiss, K.Kokubun, F.G.Kondev, R.Mizuno, M.Mukai, N.Nepal, M.N.Nurhafiza, S.Ohta, S.E.A.Orrigo, M.Pallas, J.Park, B.C.Rasco, D.Rodriguez-Garcia, H.Sakurai, L.Sexton, Y.Shimizu, H.Suzuki, A.Vitez-Sveiczer, H.Takeda, A.Tarifeno-Saldivia, A.Tolosa-Delgado, J.A.Victoria, Y.X.Watanabe, J.M.Yap

First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in ²¹³Tl and ²¹⁵Tl

RADIOACTIVITY ^213,215Tl(β^-), (IT) [from ⁹Be(²³⁸U, X), E=345 MeV/nucleon]; measured decay products, Eβ, Iβ, Eγ, Iγ; deduced level energies, J, π, T_1/2, isomeric decay scheme, conversion electrons or Meitner-Ellis electrons, the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region. Comparison with calculations. The RIBF facility, RIKEN Nishina Center.

doi: 10.1103/PhysRevLett.133.072501