New stellar reaction rates forMg25(p,γ)26Al andAl25(p,γ)26Si
| Autor: | P.M. Endt, H. Herndl, Michael Wiescher, Christian Iliadis, L. Buchmann |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Physical Review C. 53:475-496 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.53.475 |
| Popis: | Existing experimental proton stripping reaction data on {sup 25}Mg leading to threshold states in {sup 26}Al are reinvestigated and reanalyzed in a consistent and improved manner. We use unbound state form factors in the DWBA analysis of the measured deuteron angular distributions to deduce absolute rather than relative proton partial widths. For higher-lying resonances these values are compared to widths obtained from ({ital p},{gamma}) work. It is also shown that several of the unique {ital J}{sup {pi}} values assigned previously to {sup 26}Al states are erroneous. This paper reports on a reanalysis of spins, parities, and isospins for {sup 26}Al states located at {ital E}{sub {ital x}}{lt}8.00 MeV. We deduce new stellar rates for the reaction {sup 25}Mg({ital p},{gamma}){sup 26}Al and compare our results with previous values. Furthermore, shell-model calculations for the mass {ital A}=26 system are performed. Theoretical excitation energies, {ital J}{sup {pi}} values, {gamma}-ray transition strengths, spectroscopic factors, and proton partial widths are compared to experimental data and new shell-model assignments of experimental states in {sup 26}Al are derived. We estimate Coulomb displacement energies of excited {sup 26}Mg and {sup 26}Si mirror states and present new analog assignments for {ital T}=1 triplet states in {ital A}=26 nuclei. Basedmore » on shell-model results and analog state information we present updated stellar rates for the {sup 25}Al({ital p},{gamma}){sup 26}Si reaction. {copyright} {ital 1996 The American Physical Society.}« less |
| Databáze: | OpenAIRE |
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