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Physical Review Letters 82 (1999) 295-298
Observation of the Z=N+1 nuclei $_{39}^{77=$Y, $_{40=^{79}Zr and $_{42}^{83}$Mo
Z. Janas, C. Chandler, B. Blank1, P.H. Regan, A.M. Bruce, W.N. Catford, N. Curtis, S. Czajkowski1, P. Dessagne2, A. Fleury1, W. Gelletly, J. Giovinazzo1, R. Grzywacz, M. Lewitowicz, C. Longour2, C. Marchand1, C. Miehe2, N.A. Orr3, R.D. Page, C.J. Pearson, M. Pravikoff1, A.T. Reed, M-G. Saint-Laurent, J.A. Sheikh, S.M. Vincent, R. Wadsworth, D.D. Warner, J.S. Winfield

The very neutron deficient Z = N+1 nuclei 3977Y, 4079Zr, and 4283Mo have been observed for the first time following the fragmentation of a 92Mo beam. In contrast, no evidence was found for the existence of 4181Nb and 4385Tc. The observation of 3977Y is of particular interest in light of the instability of the odd-proton, Z = N+1 systems, 3569Br, 3773Rb, 4181Nb, and 4385Tc, and may be explained as a consequence of the shape polarizing effect of the highly deformed, prolate Z = N = 38 core. The experimental results are discussed within the framework of the shell-correction model, which together with proton-decay calculations allow an estimate of the proton separation energies of these highly exotic systems to be calculated.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  IReS - Institut de Recherches Subatomiques
3 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
structure nucléaire
Physique/Physique Nucléaire Expérimentale