– 11 – QPM Calculations of the Nucleus 119Sb

To better understand our 121Sb(p,t)119Sb reaction data [1], the (p,t) experiment has been supplemented with microscopic calculations of the integrated cross sections within the Quasiparticle-Phonon Model [2]. These micro-scopic calculations of the 121Sb(p,t)119Sb integrated cross sections have been performed since it is not possible to unequivocally identify the spin of most of the excited lev-els of 119Sb from the analysis of the experimental angular distributions. QPM calculations for the neighboring residual even-even nucleus 118Sn have been performed with a wave function of excited states with multipolarity J, written as a com-bination of one- and two-phonon configurations. The pro-perties of the phonon excitations have been obtained by solving quasiparticle RPA equations for different natural-parity multipolarities from 0+ to 7−. These equations yield the phonon energies and the internal fermion structure of each phonon. The strength of the residual interaction in the model Hamiltonian has been adjusted to the experi-mental properties of the collective 2+1 and 3 1 levels. Calculations for the odd-mass nucleus 119Sb have been performed with a wave function containing quasiparticle-, [quasiparticle x one-phonon]-, and [quasiparticle x two-phonon]-configurations: Ψν(JM) = C ν(J) α+JM + jλ