The low-lying structures of the self-conjugate (N = Z) nuclei 8241Nb41 and 8643Tc43 have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a 107Ag 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 5628Ni and 10050Sn 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 82Nb may be interpreted as an isospin-changing K isomer.
|Titolo:||Neutron-proton pairing competition in N = Z nuclei : metastable state decays in the proton dripline nuclei Nb-82(41) and (43TC)-T-86|
|Autori interni:||CAMERA, FRANCO|
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||28-feb-2008|
|Digital Object Identifier (DOI):||10.1016/j.physletb.2008.01.017|
|Appare nelle tipologie:||01 - Articolo su periodico|