Observation of theZ=N+1NucleiY3977,Z4079r, andM4283o
| Autor: | N. Curtis, A.T. Reed, Ph. Dessagne, Alison Bruce, J. A. Sheikh, W. Gelletly, C. Longour, B. Blank, J. Giovinazzo, D. D. Warner, M. Lewitowicz, M.S. Pravikoff, J. S. Winfield, SM Vincent, R. Wadsworth, Robert Grzywacz, Ch. Miehé, A. Fleury, C. Marchand, S. Czajkowski, C. Chandler, W. N. Catford, R. D. Page, M. G. Saint-Laurent, Z. Janas, C. J. Pearson, P. H. Regan, N. A. Orr |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 82:295-298 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | The very neutron deficient $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}N+1$ nuclei ${}_{39}^{77}\mathrm{Y}$, ${}_{40}^{79}\mathrm{Zr}$, and ${}_{42}^{83}\mathrm{Mo}$ have been observed for the first time following the fragmentation of a ${}^{92}\mathrm{Mo}$ beam. In contrast, no evidence was found for the existence of ${}_{41}^{81}\mathrm{Nb}$ and ${}_{43}^{85}\mathrm{Tc}$. The observation of ${}_{39}^{77}\mathrm{Y}$ is of particular interest in light of the instability of the odd-proton, $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}N+1$ systems, ${}_{35}^{69}\mathrm{Br}$, ${}_{37}^{73}\mathrm{Rb}$, ${}_{41}^{81}\mathrm{Nb}$, and ${}_{43}^{85}\mathrm{Tc}$, and may be explained as a consequence of the shape polarizing effect of the highly deformed, prolate $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}38$ 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. |
| Databáze: | OpenAIRE |
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