New stellar reaction rates for 25Mg(p,γ)26Al and 25Al(p,γ)26Si

Details New stellar reaction rates for 25Mg(p,γ)26Al and 25Al(p,γ)26Si New stellar reaction rates for 25Mg(p,γ)26Al and 25Al(p,γ)26Si

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvc..53..475i&link_type=abstract

Physical Review C (Nuclear Physics), Volume 53, Issue 1, January 1996, pp.475-496

Physics

Nuclear Physics

55

Radiative Capture, 20<=A<=38, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

Existing experimental proton stripping reaction data on 25Mg leading to threshold states in 26Al 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 (p,γ) work. It is also shown that several of the unique Jπ values assigned previously to 26Al states are erroneous. This paper reports on a reanalysis of spins, parities, and isospins for 26Al states located at Ex<8.00 MeV. We deduce new stellar rates for the reaction 25Mg(p,γ)26Al and compare our results with previous values. Furthermore, shell-model calculations for the mass A=26 system are performed. Theoretical excitation energies, Jπ values, γ-ray transition strengths, spectroscopic factors, and proton partial widths are compared to experimental data and new shell-model assignments of experimental states in 26Al are derived. We estimate Coulomb displacement energies of excited 26Mg and 26Si mirror states and present new analog assignments for T=1 triplet states in A=26 nuclei. Based on shell-model results and analog state information we present updated stellar rates for the 25Al(p,γ)26Si reaction.

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