Phys.Rev. C 95, 041302 (2017)

S.Chen, P.Doornenbal, A.Obertelli, T.R.Rodriguez, G.Authelet, H.Baba, D.Calvet, F.Chateau, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, V.Lapoux, T.Motobayashi, M.Niikura, N.Paul, J.-Y.Rousse, H.Sakurai, C.Santamaria, D.Steppenbeck, R.Taniuchi, T.Uesaka, T.Ando, T.Arici, A.Blazhev, F.Browne, A.M.Bruce, R.Caroll, L.X.Chung, M.L.Cortes, M.Dewald, B.Ding, F.Flavigny, S.Franchoo, M.Gorska, A.Gottardo, A.Jungclaus, J.Lee, M.Lettmann, B.D.Linh, J.Liu, Z.Liu, C.Lizarazo, S.Momiyama, K.Moschner, S.Nagamine, N.Nakatsuka, C.R.Nita, C.Nobs, L.Olivier, R.Orlandi, Z.Patel, Zs.Podolyak, M.Rudigier, T.Saito, C.Shand, P.-A.Soderstrom, I.Stefan, V.Vaquero, V.Werner, K.Wimmer, Z.Xu

Low-lying structure and shape evolution in neutron-rich Se isotopes

NUCLEAR REACTIONS ¹H(⁸⁹Se, np), (⁹¹Br, 2p), (⁹⁴Br, n2p), (⁹⁵Br, 2p), E=270 MeV/nucleon, [secondary ⁸⁹Se, ^91,94,95Br beams from ⁹Be(²³⁸U, F), E=345 MeV/nucleon using BigRIPS fragment separator at RIBF-RIKEN facility]; measured particle spectra using time projection chamber (TPC) of the MINOS ensemble, and Doppler-corrected gamma spectra, Eγ, Iγ, γγ-coin using DALI2 array of 186 NaI(Tl) detectors. ^88,90,92,94Se; deduced levels, J, π, triaxiality; calculated potential energy surfaces for g.s., first and second 2+ states. Comparison with self-consistent beyond-mean-field calculations using Gogny D1S interaction. Systematics of first 2+ states and E(first 4+)/E(first 2+) for N=50-60 even-A Zr, Sr, Kr, and Se isotopes.

doi: 10.1103/PhysRevC.95.041302