Hole-strength distributions from the 34S(, 3He)33P and 34S(, t)33S reactions

Abstract

Abstract A vector-polarized deuteron beam of 52 MeV was used to excite proton and neutron hole states via the 34S( d , 3He)33P and the 34S( d , t)33S reactions. From the measured angular distributions of differential cross sections σ(θ) and analyzing powers T11(θ) we determined the spins of 9 states in 33P and of 13 states in 33S. The comparison of proton and neutron pick-up spectra yields isospin assignments for 33S states (T = 1 2 , 3 2 ). Spectroscopic factors deduced from a DWBA analysis were used to determine the lowest moments of the strengths distributions in 33P and 33S. Combined with proton and neutron stripping data we calculate ground state occupancies and single-particle energies for 34S and determine the Fermi surfaces for protons and neutrons. This information allows the application of a recently published sum rule to predict Gamow-Teller strengths S+ and S−. Combined with previous data the extracted single-particle energies exhibit systematic features which we parametrise as linear functions of mass number A and isospin To for target nuclei with 28 ⩽ A ⩽ 52. The parameters are closely related to effective particle-hole interactions.