The binding energies of even-even and odd-odd NϭZ nuclei are compared. After correcting for the symmetry energy we find that the lowest Tϭ1 state in odd-odd NϭZ nuclei is as bound as the ground state in the neighboring even-even nucleus, thus providing evidence for isovector np pairing. However, Tϭ0 states in odd-odd NϭZ nuclei are several MeV less bound than the even-even ground states. We associate this difference with the Tϭ1 pair gap and conclude from the analysis of binding energy differences and blocking arguments that there is no evidence for an isoscalar ͑deuteronlike͒ pair condensate in NϭZ nuclei.

No abstract

No abstract

No abstract