Abstract
Multinucleon transfer cross sections in the system 40 Ca+ 96 Zr 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.
Highlights
In quasi-elastic reactions nuclei enter into contact through the tail of their density distributions and nucleon transfer processes take place in between levels close to the Fermi surfaces of the donor and acceptor
Excitation energies are restricted to few MeV and absorption is reduced to a small contribution. These peculiar conditions should in principle allow to extract more quantitative information on the mechanism of multiple transfer processes, for example on the relative contribution of single particle and more complex degrees of freedom which include nucleon-nucleon correlations [1]
One sees the events corresponding to Ca-like recoils as well as the curved shapes corresponding to Zr-like ions entering into PRISMA
Summary
In quasi-elastic reactions nuclei enter into contact through the tail of their density distributions and nucleon transfer processes take place in between levels close to the Fermi surfaces of the donor and acceptor. In most cases the projectile has a signif cant fraction of the target mass, leaving the backscattered projectile-like fragment with such a low energy that usual identif cation techniques become invalid To partly overcome this problem with heavy ions, two methods have been employed so far, one that identif es the (heavy) target recoils at zero degree with recoil mass spectrometers [11,12] and another making use of inverse kinematics, detecting the lighter targetlike particles with a magnetic spectrometer at very forward angles [13,14]. Projectile and target are closed or near-closed shell nuclei for both neutrons and protons, representing a good reference for a quantitative comparison with theoretical calculations This experimental and theoretical environment provides very suitable conditions for a proper study of the mechanism of multiple transfer processes
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