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Observation of the Z=N+1 nuclei $_(39)^(77=$Y, $_(40=^(79)Zr and $_(42)^(83)$Mo
Janas Z., Chandler C., Blank B., Regan P.H., Bruce A.M. et al
Physical Review Letters 82 (1999) 295-298 - http://hal.in2p3.fr/in2p3-00003465
Physique/Physique Nucléaire Expérimentale
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
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I
Chemin du Solarium - BP 120 - 33175 Gradignan Cedex
2 :  IReS - Institut de Recherches Subatomiques
CNRS : UMR7500 – IN2P3 – Université Louis Pasteur - Strasbourg I – Cancéropôle du Grand Est
23 rue du Loess - BP 28 - 67037 Strasbourg Cedex 2
3 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
CNRS : UMR6534 – IN2P3 – Université de Caen Basse-Normandie – Ecole Nationale Supérieure d'Ingénieurs de Caen
ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex
structure nucléaire
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.

Articles dans des revues avec comité de lecture
Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)

CENBG 9812
27.50.+e, 21.10.Dr, 25.70.Mn