arXiv:nucl-th/9907121·v1·Nuclear Theory
Is there np pairing in odd-odd N=Z nuclei?
A. O. Macchiavelli🇺🇸 · P. Fallon🇺🇸 · R. M. Clark🇺🇸 · M. Cromaz🇺🇸 · M. A. Deleplanque🇺🇸 · R. M. Diamond🇺🇸 · G. J. Lane🇺🇸 · I. Y. Lee🇺🇸 · F. S. Stephens🇺🇸 · C. E. Svensson🇺🇸 · K. Vetter🇺🇸 · D. Ward (Nuclear Science Division, Lawrence Berkeley National Laboratory)🇺🇸
Abstract
The binding energies of even-even and odd-odd N=Z nuclei are compared. After correcting for the symmetry energy we find that the lowest T=1 state in odd-odd N=Z nuclei is as bound as the ground state in the neighboring even-even nucleus, thus providing evidence for isovector np pairing. However, T=0 states in odd-odd N=Z nuclei are several MeV less bound than the even-even ground states. We associate this difference with a pair gap and conclude that there is no evidence for an isoscalar pairing condensate in N=Z nuclei.
Comments: RevTeX, twocolumns, 4 pages, 4 figures. Submitted to Phys. Rev. Lett