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Neutron–proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei NB-82(41) and Tc-86(43)

Abstract : The low-lying structures of the self-conjugate (N = Z) nuclei Nb-82(41)41 andTc-86(43)43 have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a Ag-107 beam. These represent the heaviest odd–odd N = Z nuclei in which internal decays have been identified to date. The resulting level schemes shed light on the shape evolution along the N = Z line between the doubly-magic systems Ni-56(28) and Sn-100(50) and support a preference for T = 1 states in Tz = 0 odd–odd nuclei at low excitation energies associated with a T = 1 neutron–proton pairing gap. Comparison with Projected Shell Model calculations suggests that the decay in Nb-82 may be interpreted as an isospin-changing K isomer.
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http://hal.in2p3.fr/in2p3-00290042
Contributor : Pascale Chambon <>
Submitted on : Tuesday, June 24, 2008 - 3:02:14 PM
Last modification on : Tuesday, November 24, 2020 - 11:30:20 AM

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A.B. Garnsworthy A, P.H. Regan, L. Cáceres, S. Piétri, Y. Sun, et al.. Neutron–proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei NB-82(41) and Tc-86(43). Physics Letters B, Elsevier, 2008, 660, pp.326-330. ⟨10.1016/j.physletb.2008.01.017⟩. ⟨in2p3-00290042⟩

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