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Is there np pairing in odd-odd N=Z nuclei?

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arxiv nucl-th/9907121 v1 pith:LONTMDWT submitted 1999-07-30 nucl-th nucl-ex

A. O. Macchiavelli , P. Fallon , R. M. Clark , M. Cromaz , M. A. Deleplanque , R. M. Diamond , G. J. Lane , I. Y. Lee
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F. S. Stephens C. E. Svensson K. Vetter D. Ward (Nuclear Science Division Lawrence Berkeley National Laboratory)
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classification nucl-thnucl-ex
keywords nucleiodd-oddeven-evenpairingboundevidencegroundstate
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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.

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