Heavy ion reactions as probes for spin strength

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Abstract

Heavy ion charge-exchange reactions have great potential for probing spin-transfer strength in nuclei, provided beams of sufficient energy are used so that the reactions might be expected to be simple (one-step) in nature. Tests of reaction mechanisms have been carried out for two of the most favorable reactions, (6Li, 6He) and (12C, 12N). We have shown that the first reaction is mainly one-step in nature at 25 MeV/nucleon and above and have established a calibration curve relating cross sections to Gamow-Teller matrix elements. We have also shown that the second reaction is likely to be mainly one-step above about 50 MeV/nucleon. A (12C, 12N) measurement on Fe targets was done recently, with the aim of determining astrophysically interesting Gamow-Teller strengths in Fe nuclei.

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This work was supported by the U.S. National Science Foundation under Grants PHY83-12245 and PHY86-11210.

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