Neutron-Proton Correlations in an Exactly Solvable Model

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dc.creatorEngel, J.
dc.creatorPittel, S.
dc.creatorVogel, P.
dc.creatorStoitsov, M.
dc.creatorDukelsky, J.
dc.date1996-10-29
dc.date.accessioned2026-07-07T11:36:37Z
dc.date.available2026-07-07T11:36:37Z
dc.descriptionWe examine isovector and isoscalar neutron-proton correlations in an exactly solvable model based on the algebra SO(8). We look particularly closely at Gamow-Teller strength and double beta decay, both to isolate the effects of the two kinds of pairing and to test two approximation schemes: the renormalized neutron-proton QRPA (RQRPA) and generalized BCS theory. When isoscalar pairing correlations become strong enough a phase transition occurs and the dependence of the Gamow-Teller beta+ strength on isospin changes in a dramatic and unfamiliar way, actually increasing as neutrons are added to an N=Z core. Renormalization eliminates the well-known instabilities that plague the QRPA as the phase transition is approached, but only by unnaturally suppressing the isoscalar correlations. Generalized BCS theory, on the other hand, reproduces the Gamow-Teller strength more accurately in the isoscalar phase than in the usual isovector phase, even though its predictions for energies are equally good everywhere. It also mixes T=0 and T=1 pairing, but only on the isoscalar side of the phase transition.
dc.description13 pages + 11 postscript figures, in RevTeX
dc.identifierhttps://arxiv.org/abs/nucl-th/9610045
dc.identifierhttp://arxiv.org/abs/nucl-th/9610045
dc.identifierPhys.Rev.C55:1781-1788,1997
dc.identifierdoi:10.1103/PhysRevC.55.1781
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198977
dc.subjectNuclear Theory
dc.titleNeutron-Proton Correlations in an Exactly Solvable Model
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