Nuclear level structures in 160,162Tb studied with [formula omitted] reactions

Abstract

Dy 161 , 163 ( t , α ) angular distributions were measured using 17 MeV tritons from the McMaster University FN tandem Van de Graaff accelerator. Reaction products were analyzed with an Enge split-pole magnetic spectrograph. New nuclear structure information is reported for each of the residual odd–odd nuclides 160Tb and 162Tb. Clear assignments can be made for the K = 1 and K = 4 bands formed by coupling the 3 2 + [ 411 ] proton with the 5 2 + [ 642 ] neutron of the 161Dy target and with the 5 2 − [ 523 ] neutron of the 163Dy target. Bands formed by transfer of the 5 2 + [ 413 ] proton can also be assigned. Two new Gallagher–Moszkowski splitting energies are reported. Although large peaks can be attributed to transfer of the 5 2 − [ 532 ] and 7 2 − [ 523 ] protons, strong Coriolis mixings of the four two-quasiparticle bands formed by these transfers in each nuclide, coupled with the unknown Gallagher–Moszkowski splittings and Newby shifts, limit the interpretation to some tentative assignments. From reaction Q-values the mass of 162Tb is determined to be ∼80 keV higher than reported in the 2003 mass tables.