The (Li8, α) reaction at low energy: DirectH4cluster transfer?
| العنوان: | The (Li8, α) reaction at low energy: DirectH4cluster transfer? |
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| المؤلفون: | F. D. Becchetti, Paul DeYoung, Jerry Hinnefeld, R.S. Raymond, P.J. VanWylen, J. Lucido, B. B. Hilldore, D.A. Roberts, J. J. Kolata, Grigory Rogachev, J. P. Bychowski, A J. Huisman |
| المصدر: | Physical Review C. 71 |
| بيانات النشر: | American Physical Society (APS), 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | Physics, Nuclear and High Energy Physics, Angular range, education.field_of_study, Transfer (group theory), Low energy, Population, Cluster (physics), Alpha particle, Atomic physics, education, Excitation, Spectral line |
| الوصف: | The ($^{8}\mathrm{Li}$, \ensuremath{\alpha}) reaction has been studied at E($^{8}\mathrm{Li})=27.7$ MeV on targets of ${}^{\mathrm{nat}}$C, $^{27}\mathrm{Al}$, and $^{208}\mathrm{Pb}$ using a secondary $^{8}\mathrm{Li}$ beam. The \ensuremath{\alpha}-energy spectra for $^{27}\mathrm{Al}$ and $^{208}\mathrm{Pb}$ are generally nondistinct and resemble fragmentation spectra. In contrast, data for the ${}^{\mathrm{nat}}$C target exhibit enhanced ($^{8}\mathrm{Li}$, \ensuremath{\alpha}) cross sections in the region corresponding to population of low-lying levels in $^{16}\mathrm{N}$. Angular distributions were determined over a large angular range and exhibit a strong forward peaking for $^{27}\mathrm{Al}$ and some forward peaking for the ${}^{\mathrm{nat}}$C data. They are otherwise rather featureless but distinct from spectra expected from fusion evaporation. The data for $^{27}\mathrm{Al}$ are indicative of either direct or sequential fragmentation processes. Similar analysis of limited data obtained at $E(^{8}\mathrm{Li})=27.7$ MeV for the $^{208}\mathrm{Pb}$ target, along with data previously obtained at higher $^{8}\mathrm{Li}$ energies, is suggestive of a sequential breakup mechanism. In the case of the ${}^{\mathrm{nat}}$C target, the data corresponding to low excitation energies in $^{16}\mathrm{N}$ exhibit ($^{8}\mathrm{Li}$, \ensuremath{\alpha}) angular distributions that appear to be most consistent with a $^{4}\mathrm{H}$ transfer mechanism. However, we cannot distinguish between a one-step $^{4}\mathrm{H}$ cluster transfer and a multistep $^{4}\mathrm{H}$ transfer (such as $n\phantom{\rule{0.3em}{0ex}}+\phantom{\rule{0.3em}{0ex}}^{3}\mathrm{H})$. |
| تدمد: | 1089-490X 0556-2813 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::2b47bfaeb6e1638958f813cdb6228ad0 https://doi.org/10.1103/physrevc.71.054610 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........2b47bfaeb6e1638958f813cdb6228ad0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1089490X 05562813 |
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