Weisskopf units for neutron-proton pair transfers

TL;DR

This paper introduces neutron-proton Weisskopf units ($np$-WU) as a new standardized measure to analyze $np$ pairing effects in nuclear reactions along the N=Z line, applicable from oxygen to tin isotopes.

Contribution

The paper presents the concept of $np$-Weisskopf units for the first time, tailored for analyzing specific nuclear reactions and pairing effects in N=Z nuclei.

Findings

Defined $np$-Weisskopf units for relevant nuclear orbits.

Provided a framework for analyzing $np$ pairing effects.

Applicable to nuclei from $^{16}$O to $^{100}$Sn.

Abstract

We introduce the concept of neutron-proton two-particle units ($np$-Weisskopf units) to be used in the analysis of the ($^3$He,$p)$ and $(p,^3$He) \added{reactions on nuclei} along the N=Z line. These are presented for the conditions relevant to the $(n,j,\ell$) orbits expected from $^{16}$O to $^{100}$Sn. 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.