Lifetimes of a shears band in 139Sm

• Published in: Physics letters. B Vol. 388; no. 3; pp. 468 - 474
• Main Authors: Brandolini, F., Ionescu-Bujor, M., Medina, N.H., Ribas, R.V., Bazzacco, D., De Poli, M., Pavan, P., Rossi Alvarez, C., de Angelis, G., Lunardi, S., De Acuña, D., Napoli, D.R., Frauendorf, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.1996
• Subjects: Cranking shell model; Fusion-evaporation; Lifetimes; Tilted axis cranking model; Total routhian surface calculations; Triaxial deformation; Tilted axis cranking model; Cranking shell model; 27.60.+j; Fusion-evaporation; Total routhian surface calculations; 21.10.Tg; Triaxial deformation; 21.10.Ky; 21.60.Cs; Lifetimes
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(96)01202-6

Lifetimes have been measured in 139Sm with the DSAM method, using the reaction 62Ni( 81Br,p3n) 139Sm at 350 MeV. In the negative-parity regular dipole band based on the 25 2 − state at 3325 keV values of 0.60(21), 0.40(14) and 0.25(8) ps were found for the 337, 409 and 473 keV transitions, respectively. The deduced B(M1) and B(E2) are in agreement with the predictions of the tilted axis cranking model, allowing a triaxial equilibrium shape for the assumed νh 11 2 ⊗ πh 11 2 2 configuration.