Half-Life Measurement for therp-Process Waiting Point NuclideZ80r
| Autor: | T. N. Ginter, Robert Grzywacz, Michael Wiescher, W. Reviol, J. A. Winger, E. F. Zganjar, J. J. Ressler, D. Kulp, J. Rikovska, William B. Walters, C. R. Bingham, J. C. Batchelder, A. Piechaczek, D. S. Brenner, K. P. Rykaczewski, B. D. MacDonald, Carl J Gross, Ani Aprahamian |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 84:2104-2107 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | X-ray bursts have been suggested as a possible site for the astrophysical $\mathrm{rp}$-process. The time scale for the process is governed by $\ensuremath{\beta}$-decay half-lives of several even-even $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}Z$ waiting point nuclei, in particular, $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}40$ ${}^{80}\mathrm{Zr}$. A $4.1({+0.8}{\ensuremath{-}0.6})\ensuremath{-}\mathrm{s}$ ${\ensuremath{\beta}}^{+}/\mathrm{EC}$ half-life for ${}^{80}\mathrm{Zr}$ was determined by observing delayed 84-keV $\ensuremath{\gamma}$ rays depopulating a ${T}_{1/2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4\ensuremath{-}\ensuremath{\mu}\mathrm{s}$ isomer at 312 keV in the daughter ${}^{80}\mathrm{Y}$. As this half-life is lower than many previously predicted values, the calculated excessive production of $A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}80$ nuclides in astrophysical x-ray burst scenarios is reduced, and less extreme conditions are necessary for the production of heavier nuclides. |
| Databáze: | OpenAIRE |
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