On the importance of np-pairs in the isovector pairing model Feng Pan, Chong Qi, Lianrong Dai, Grigor Sargsyan, Kristina D. Launey and Jerry P. Draayer EPL, 132 3 (2020) 32001 Published online: 29 December 2020 DOI: 10.1209/0295-5075/132/32001