Competition between isoscalar and isovector pairing correlations in N=Z nuclei

Details Competition between isoscalar and isovector pairing correlations in N=Z nuclei Competition between isoscalar and isovector pairing correlations in N=Z nuclei

2004-04-02

arxiv.org/abs/nucl-th/0404003v1

Phys.Rev. C69 (2004) 061302

Physics

Nuclear Physics

Nuclear Theory

5 pages, 4 figures, to be published in Phys. Rev. C (R)

Scientific paper

10.1103/PhysRevC.69.061302

We study the isoscalar (T=0) and isovector (T=1) pairing correlations in N=Z nuclei. They are estimated from the double difference of binding energies for odd-odd N=Z nuclei and the odd-even mass difference for the neighboring odd-mass nuclei, respectively. The empirical and BCS calculations based on a T=0 and T=1 pairing model reproduce well the almost degeneracy of the lowest T=0 and T=1 states over a wide range of even-even and odd-odd N=Z nuclei. It is shown that this degeneracy is attributed to competition between the isoscalar and isovector pairing correlations in N=Z nuclei. The calculations give an interesting prediction that the odd-odd N=Z nucleus 82Nb has possibly the ground state with T=0.

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