Isoscalar and isovector neutron-proton pairing
A.V.Afanasjev
TL;DR
This paper reviews neutron-proton pairing in N=Z nuclei, emphasizing the distinction between isovector and isoscalar types, and concludes that there is no substantial evidence for isoscalar np-pairing.
Contribution
It provides a comprehensive review of neutron-proton pairing, focusing on the debated existence of isoscalar pairing and summarizing current evidence.
Findings
Isovector np-pairing is well established.
No substantial evidence supports isoscalar np-pairing.
The review clarifies the current understanding of np-pairing types.
Abstract
Neutron-proton (np-) pairing is expected to play an important role in the N Z nuclei. In general, it can have isovector and isoscalar character. The existence of isovector np-pairing is well established. On the contrary, it is still debated whether there is an isoscalar np-pairing. The review of the situation with these two types of pairing with special emphasis on the isoscalar one is presented. It is concluded that there are no substantial evidences for the existence of isoscalar np-pairing.
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