L. Zetta

High-resolution investigation of the 121Sb(p,t)119Sb reaction and quasiparticle?phonon model description

The 121 Sb(p,t) 119 Sb reaction has been measured in a high-resolution experiment at an incident energy of 21 MeV. Accurate measurement of the (p,t) reaction angular distributions for the transitions to the levels of 119 Sb allows us to determine energies of 59 levels, 23 of which have been identified for the first time, and to assign the angular momentum transfer values and a welldefined range for the J values. DWBA analysis has been performed in a finite-range approximation, assuming a dineutron cluster pickup mechanism, by using conventional Woods–Saxon potentials for the entrance proton and exit triton channel. The present (p,t) data have been supplemented by microscopic calculations in the framework of the quasiparticle–phonon model, giving a reasonably good description of the experimental fragmentation of the integrated cross sections and the absence of (p,t) strength above 2.9 MeV.

(p, t) transition strengths for nuclei around Z = 50 and the IBA model

The reactions have been measured at MeV. The ground state to ground state and ground state to transition intensities for these reactions, together with available Pd, Cd, and Te (p, t) data are compared with the interacting boson model for two-nucleon transfer strengths. For the mass dependence within the isotopic chains good agreement with the U(5) limit predictions is obtained.

Nuclear spectroscopy by means of (p⃗,α) reactions on magic and near magic nuclei: 122Sn(p⃗,α)119In

(p,α) reactions on near magic nuclei was used to assign unambiguously spin and parity to higher excited states using the homology concept, in the regions A∼208 and A∼90. Here some preliminary results, both experimental and theoretical for the 122Sn(p,α)119In reaction are presented.

Spectroscopy of sup 205 Tl by means of the sup 208 Pb( rvec p ,. alpha. ) sup 205 Tl reaction

The ({ital {rvec p}},{alpha}) reaction on {sup 208}Pb has been studied at an incident proton energy of 22 MeV using a polarized proton source and a spectrometer. The angular distributions and the asymmetries for transitions to levels of {sup 205}Tl up to an excitation energy of 3 MeV have been measured. The analysis of these data by means of the finite-range distorted-wave Born approximation theory using either conventional Woods-Saxon and double-folded {alpha}-particle potentials has allowed us to make several new attributions of spin and parity.