Phys.Rev. C 106, 034307 (2022)

Q.B.Zeng, S.Guo, Z.Liu, J.G.Li, H.H.Li, J.G.Wang, Z.Y.Zhang, L.Ma, Y.H.Qiang, M.H.Huang, G.S.Li, Y.D.Fang, M.L.Liu, B.Ding, Y.Zheng, J.H.Li, H.Y.Lu, W.Q.Zhang, K.L.Wang, X.Y.Liu, H.Huang, F.F.Zeng, X.H.Yu, A.Rohilla, J.F.Huang, H.L.Fan, C.Qi, C.X.Yuan, C.M.Petrache, E.A.Lawrie, W.Zuo, Z.G.Gan, X.H.Zhou

Configurations of the low-lying states in ¹⁴⁶Eu

RADIOACTIVITY ^146mEu(IT) [from ¹²⁴Sn(²⁷Al, 5n), E=127 MeV, followed by mass-separation of evaporation residues (ERs) using the SHANS separator at the Sector-Focusing Cyclotron (SFC) of HIRFL-Lanzhou]; measured Eγ, Iγ, γγ-coin, isomer and level T_1/2 by γ(t) and γγ(t) fast-timing method using three LaBr₃(Ce) detectors, one coaxial and one Clover HPGe detectors, and analyzed using mirror symmetric centroid difference (MSCD) method. ¹⁴⁶Eu; deduced levels, J, π, T_1/2 of 6- levels and a 9+ isomer, multipolarities, upper limits of multipole mixing ratios, B(M1), spherical configurations. ¹⁴⁶Sm; measured level T_1/2 of the first 2+ state as a test case for measurements of short half-lives for levels in ¹⁴⁶Eu. Comparison with shell model calculations using several different effective interactions, and with previous experimental results. Systematics of levels and B(M1) values in N=83 isotones ¹⁴²Pr, ¹⁴⁴Pm, ¹⁴⁶Eu.

doi: 10.1103/PhysRevC.106.034307