Single-neutron transfer from 11Be gs via the (p,d) reaction with a radioactive beam

The 11Be(p,d)10Be reaction has been performed in inverse kinematics with a radioactive 11Be beam of E/A = 35.3 MeV. Angular distributions for the 0+ ground state, the 2+, 3.37 MeV state and the multiplet of states around 6 MeV in 10Be were measured at angles up to 16 deg CM by detecting the 10Be in a dispersion-matched spectrometer and the coincident deuterons in a silicon array. Distorted wave and coupled-channels calculations have been performed to investigate the amount of 2+ core excitation in 11Be gs. The use of "realistic" 11Be wave functions is emphasised and bound state form factors have been obtained by solving the particle-vibration coupling equations. This calculation gives a dominant 2s component in the 11Be gs wave function with a 16% [2+ x 1d] core excitation admixture. Cross sections calculated with these form factors are in good agreement with the present data. The Separation Energy prescription for the bound state wave function also gives satisfactory fits to the data, but leads to a significantly larger [2 x 1d] component in 11Be gs.Comment: 39 pages, 12 figures. Accepted for publication in Nuclear Physics A. Added minor corrections made in proof to pages 26 and 3

ONE, TWO AND THREE-NUCLEON TRANSFER REACTIONS INDUCED BY 12C IONS ON 12C, 16O AND 40Ca

Les réactions de transfert de un, deux et trois nucléons ont été étudiées à 114 MeV sur des cibles de 12C, 16O et 40Ca. Une caractéristique frappante de toutes les réactions est la population sélective de certains niveaux des noyaux résiduels dans un domaine d'énergie d'excitation de 50 MeV. Les excitations peuvent être expliquées par un argument semi-classique.One, two and three nucleon transfer reactions have been studied at 114 MeV on targets of 12C, 16O and 40Ca. A prominent feature of all the reactions is the selective population of levels in the residual nuclei, in an excitation range covering 50 MeV. The excitations can be explained by a semiclassical argument