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

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. Grȩbosz, A. Kelic, I. KojouharovN. Kurz, F. Montes, W. Prokopowicz, T. Saito, H. Schaffner, S. Tachenov, E. Werner-Malento, H. J. Wollersheim, G. Benzoni, B. B. Blank, C. Brandau, A. M. 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, F. R. Xu

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Abstract

The low-lying structures of the self-conjugate (N = Z) nuclei 82 41Nb41 and 86 43Tc43 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 56 28Ni and 100 50Sn 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.

Original languageEnglish
Pages (from-to)326-330
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume660
Issue number4
DOIs
Publication statusPublished - Feb 28 2008

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Garnsworthy, A. B., Regan, P. H., Cáceres, L., Pietri, S., Sun, Y., Rudolph, D., Górska, M., Podolyák, Z., Steer, S. J., Hoischen, R., Heinz, A., Becker, F., Bednarczyk, P., Doornenbal, P., Geissel, H., Gerl, J., Grawe, H., Grȩbosz, J., Kelic, A., ... Xu, F. R. (2008). Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei 82 41Nb and 86 43Tc. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 660(4), 326-330. https://doi.org/10.1016/j.physletb.2008.01.017