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Neutron-proton pairing competition in N=Z nuclei: Metastable state decays in the proton dripline nuclei <sup>82</sup><sub>41</sub>Nb and <sup>86</sup><sub>43</sub> Tc

By A.B. Garnsworthy, P.H. Regan, L. Cáceres, S. Pietri, Y. Sun, D. Rudolph, M. Górska, Zs. Podolyák, S.J. Steer, R. Hoischen, A. Heinz, F. Becker, P. Bednarczyk, P. Doornenbal, H. Geissel, J. Gerl, H. Grawe, J. Grëbosz, A. Kelic, I. Kojouharov, N. Kurz, F. Montes, W. Prokopowicz, T. Saito, H. Scaffner, S. Tachenov, E. Werner-Malento, H.J. Wollersheim, G. Benzoni, B.B. Blank, C. Brandau, Alison Bruce, F. Camera, W.N. Catford, I.J. Cullen, Zs. Dombrádi, E. Estevez, W. Gelletly, G. Ilie, J. Jolie, G.A. Jones, A. Jungclaus, M. Kmiecik, F.G. Kondev, T. Kurtukian-Nieto, S. Lalkovski, Z. Liu, A. Maj, S. Myalski, M. Pfützner, S. Schwertel, T. Shizuma, A.J. Simons, P.M. Walker, O. Wieland and F.R. Xu

Abstract

The low-lying structures of the self-conjugate (N=Z) nuclei <sup>82</sup><sub>41</sub>Nb<sub>41</sub> and <sup>86</sup><sub>43</sub>Tc<sub>43</sub> have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a <sup>107</sup>Ag 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 <sup>56</sup><sub>28</sub>Ni and <sup>100</sup><sub>50</sub>Sn 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 <sup>82</sup>Nb may be interpreted as an isospin-changing K isomer

Topics: F300 Physics
Publisher: Elsevier
Year: 2008
OAI identifier: oai:eprints.brighton.ac.uk:4731

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Citations

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  2. The Swedish Research Council, The Polish Ministry of Science and Higher Education (1-P03B-030-30 and 620/E-77/SPB/GSI/P03/DWM105/2004-2007), The Bulgarian Science Fund doi

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