Abstract
We introduce the concept of neutron-proton two-particle units (np-Weisskopf units) to be used in the analysis of the (3He,p) and (p,3He) reactions on nuclei along the N=Z line. These are presented for the conditions relevant to the (n,j,ℓ) orbits expected from 16O to 100Sn. As is the case of the Weisskopf units for electromagnetic transitions, the np-WU's will provide a simple, yet robust, measure of isoscalar and isovector np pairing collective effects.
Highlights
In 1958, Bohr, Mottelson and Pines [1] suggested a pairing mechanism in the atomic nucleus analogous to that observed in superconductors [2]
Driven by advances in experimental techniques, the development of sensitive and highly efficient instruments and the availability of radioactive beams, the study of pairing correlations in exotic nuclei is a subject of active research in nuclear physics
Given that the nuclear force is stronger in the T = 0 channel, a priori arguments suggest the existence of correlated isoscalar np pairs
Summary
In 1958, Bohr, Mottelson and Pines [1] suggested a pairing mechanism in the atomic nucleus analogous to that observed in superconductors [2]. For nuclei with N ≈ Z, neutrons and protons occupy the same single-particle orbits at their respective Fermi surfaces and pairs, consisting of a neutron and a proton (np), may form. These types of pairs couple in either isovector or isoscalar (spin-triplet with angular momentum J = 1 and isospin τ = 0) modes, the latter being allowed by. Given that the nuclear force is stronger in the T = 0 channel, a priori arguments suggest the existence of correlated isoscalar np pairs.
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