학술논문
Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei Nb-82(41) and Tc-86(43)
Document Type
Author
Garnsworthy, A B; Regan, P H; Caceres, L; Pietri, S; Sun, Y; Rudolph, Dirk; Gorska, M; Podolyak, Zs; Steer, S J; Hoischen, Robert; Heinz, A; Becker, F; Bednarczyk, P; Doornenbal, P; Geissel, H; Gerl, J; Grawe, H; Grebosz, J; Kelic, A; Kojouharov, I; Kurz, N; Montes, F; Prokopowicz, W; Saito, T; Schaffner, H; Tashenov, S; Werner-Malento, E; Wollersheim, H J; Benzoni, G; Blank, B B; Brandau, C; Bruce, A M; Camera, F; Catford, W N; Cullen, I J; Dombradi, Zs; Estevez, E; Gelletly, W; Ilie, G; Jolie, J; Jones, G A; Jungclaus, A; Kmiecik, M; Kondev, F G; Kurtukian-Nieto, T; Lalkovski, S; Liu, Z; Maj, A; Myalski, S; Pfutzner, M; Schwertel, S; Shizuma, T; Simons, A J; Walker, P M; Wieland, O; Xu, F R
Source
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 660(4):326-330
Subject
Language
English
ISSN
0370-2693
Abstract
The low-lying structures of the self-conjugate (N = Z) nuclei Nb-82(41)41 and Tc-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 T-z = 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.