Threshold effects in the 27P((3)/(2)+)→26Si+p and 27Mg((3)/(2)+)→26Mg+n mirror decays and the stellar reaction 26Si(p,γ)27P

Details Threshold effects in the 27P((3)/(2)+)→26Si+p and 27Mg((3)/(2)+)→26Mg+n mirror decays and the stellar reaction 26Si(p,γ)27P Threshold effects in the 27P((3)/(2)+)→26Si+p and 27Mg((3)/(2)+)→26Mg+n mirror decays and the stellar reaction 26Si(p,γ)27P

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..78d4323t&link_type=abstract

Physical Review C, vol. 78, Issue 4, id. 044323

Physics

Nuclear Physics

3

Spectroscopic Factors And Asymptotic Normalization Coefficients, Cluster Models, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments, 20<=A<=38

Scientific paper

Determination of the cross sections for stellar reaction 26Si(p,γ)27P using information about the 27Mg((3)/(2)+) mirror state can be influenced by mirror symmetry breaking in the 27P((3)/(2)+)→26Si+p and 27Mg((3)/(2)+)→26Mg+n amplitudes, which may arise as a threshold phenomenon due to the coupling to continuum. We study this effect within a multichannel microscopic cluster model. Our calculations confirm that such a possibility exists and suggest that the symmetry breaking in mirror decay amplitudes may become especially large if the mirror decay channels comprise only very small parts of the total wave functions. We use the estimates for mirror symmetry breaking in the 27P((3)/(2)+)→26Si+p and 27Mg((3)/(2)+)→26Mg+n amplitudes to derive the proton width for the astrophysically important 27P((3)/(2)+) resonance basing on the asymptotic normalization coefficient for its mirror bound state 27Mg((3)/(2)+) which we determine from the 26Mg(t,d)27Mg reaction.

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