Pair transfer processes probed at deep sub barrier energies

¹ Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
² Dipartimento di Fisica, Università di Padova, and Istituto Nazionale di Fisica Nucleare, I-35131 Padova, Italy
³ Dipartimento di Fisica Teorica, Università di Torino, and Istituto Nazionale di Fisica Nucleare, 10125 Torino, Italy
⁴ Ruder Bošković Institute, HR-10 001 Zagreb, Croatia
⁵ IFIC, CSIC-Universidad de Valencia, Valencia, Spain
⁶ Institut Pluridisciplinaire Hubert Curien, CNRS-IN2P3, Université de Strasbourg, F-67037 Strasbourg, France
⁷ Horia Hulubei National Institute of Physics and Nuclear Engineering, 077125, Bucharest-Magurele, Romania

^a e-mail: corradi@lnl.infn.it

Abstract

Multinucleon transfer cross sections in the system ⁴⁰Ca+⁹⁶Zr have been measured at bombarding energies ranging from the Coulomb barrier to ~ 25% below. Target-like (lighter) recoils in inverse kinematics have been completely identif ed in A,Z and Q-value with the large solid angle magnetic spectrometer PRISMA. The experimental slopes of the neutron transfer probabilities at large internuclear separation are consistent with the values derived from the binding energies. A phenomenological interpretation of the transfer probabilities indicates the presence of enhanced values for the even number of neutron transfers.