Pairing effects in quasi-elastic neutron transfer between Tin isotopes

Abstract

The transfer of neutrons between low-lying states of Tin isotopes has been measured in the reaction 12~ ~ 112Sn at energies below the Coulomb barrier. The transfer probabilities are deduced as function of the classical minimum distance from transfer and scattering cross sections at different angles and two energies. At the smallest distances very large transfer probabilities, Pt=0.5, are observed for one-and two-neutron transfer. The two-neutron transfer is significantly enhanced as compared to a successive independent single-nucleon transfer. The definition of enhancement is discussed.

Quasi-elastic neutron transfer and pairing effects in the interaction of heavy nuclei

“…The main procedure has been described in the previous publication [9]. The main procedure has been described in the previous publication [9].…”

“…Here A Q and A L denote the changes in Q-value (with respect to the optimum Q-value) and in angular mo- me) (9) c-refers to the transferred particle. The angular momentum dependent term appears in (7) in a similar way as the change of the Coulomb energy in A Q,…”

“…The definition of the enhancement has been discussed in previous publications [1,8,9]. The main problem is connected to the proper choice of the cross sections or probabilities which will be compared.…”

“…the occurrence of a nuclear Josephson-effect has been suggested [- [3][4][5]; (iii) nucleon transfers with deformed nuclei between Coulomb excited oriented nuclei will depend on the signature of particular Nilsson orbits of the single nucleon [-6, 7]. Further problems arise in the study of multi-nucleon transfer if the incident energy is above the "barrier"; deeply inelastic collisions, in which many nucleons are exchanged with corresponding energy loss in the relative motion, occur already at energies very close to the "Coulomb barrier" [8,9], and may contribute to quasi-elastic reactions. Further problems arise in the study of multi-nucleon transfer if the incident energy is above the "barrier"; deeply inelastic collisions, in which many nucleons are exchanged with corresponding energy loss in the relative motion, occur already at energies very close to the "Coulomb barrier" [8,9], and may contribute to quasi-elastic reactions.…”

“…lI and IV the different concepts already used in [8,9]. lI and IV the different concepts already used in [8,9].…”