Physics – Nuclear Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nupha.537..153k&link_type=abstract
Nuclear Physics A, Volume 537, Issue 1-2, p. 153-166.
Physics
Nuclear Physics
12
Nuclear Reaction
Scientific paper
The nuclear level structure of 21Mg has been studied by the 24Mg(3He, 6He)21Mg reaction at 74 MeV. Angular distributions of the three-nucleon transfer reaction (3He, 6He) are measured for the first time, and successfully analyzed with exact finite-range distorted-wave-Born-approximation calculations, giving clear transferred angular momentum assignments. More than 20 states have been identified with excitation energy and spin-parity determinations, including a possible s-wave resonance just above the proton threshold. One of the s-wave resonances assumed in the previous stellar reaction rate estimates is found to be a bound state. The stellar reaction rate of the 20Na(p, γ)21Mg process is estimated using the experimental data. The results predict the ignition of the proton radiative-capture process at T = 1×108K under typical nova conditions (hydrogen density, XHϱ = 5×105 g/cm3). This temperature happens to be in agreement with the previous theoretical estimates, but the new reaction rate is a few orders of magnitude smaller than the previous predictions for T ⋍ 2-10×108K. The results also suggest that the nucleosynthesis flow of the rapid-proton process will run up to 21Mg immediately after breakout from the hot-CNO cycle.
Fuchi Yoshihide
Funatsu Y.
Ikeda Naoki
Kajino Taka
Kato Shoji
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