Physics – Nuclear Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvc..44..398a&link_type=abstract
Physical Review C (Nuclear Physics), Volume 44, Issue 1, July 1991, pp.398-414
Physics
Nuclear Physics
32
Direct Reactions, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
Angular distributions have been measured for 0+-->1+ transitions with the (12C,12B) reaction on targets of 12C, 26Mg, 54Fe, 58Ni, and 90Zr and with the (12C,12N) reaction on targets of 12C and 56Fe. The bombarding energy was E/A=70 MeV, and small-angle data were obtained. A comparison of the cross sections measured for the (12C,12B) reaction with the results of distorted-wave-approximation calculations indicates that 0+-->1+ transitions are predominantly one step at E/A=70 MeV. The calculated cross sections are generally in good agreement (to within 40% in magnitude) with the measured cross sections, and the angular distributions are well described quantitatively in many cases. A correlation between cross sections and known Gamow-Teller (GT) strengths B(GT) for the corresponding transitions has been found. This correlation, which is weakly dependent on the target mass, establishes a calibration for the reactions. It is used to determine B(GT) values of astrophysical interest for two low-lying 1+ levels in 56Mn from the cross sections measured for the 56Fe(12C,12N)56Mn reaction. The results are compared with two shell-model calculations performed to obtain B(GT) for 56-->56Mn transitions and with another calculation from the literature. Computational tests were performed to evaluate (a) the contribution to the cross sections of terms not present in nucleon-induced charge-exchange reactions and (b) the extent to which the cross sections provide a measure of GT strength.
Anantaraman N.
Austin Sam M.
Carr Joel A.
Djalali Chaden
Gillibert A.
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