Quenching of Gamow-Teller strength
The (p,n) reaction at intermediate energies has been used to measure differential cross sections in light nuclei, to final states characterized with a ..delta..J/sup ..pi../ = 1/sup +/ transfer (GT states). Experimental ft values for allowed beta-decay transitions in these nuclei are used to normalize the strength of the GT transitions in units of B(GT). This experimental GT strength is compared with predicted shell model strength. For p-shell nuclei the calculated excitation energies of the GT strength using Cohen and Kurath wave-functions are in general agreement with the empirical GT distribution. Up to an excitation energy of about 20 MeV, the total experimental and calculated GT strengths are used to obtain the quenching factor, Q/sub F/ = ..sigma..B(GT)/sub exp/..sigma..B(GT)/sub th/. It is found that Q/sub F/ decreases as the shell gets filled up. The lowest value seems to occur for single-hole nuclei. This decrease may be explained by configurations mixing not specifically included in the calculations. 21 refs., 4 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA); Ohio Univ., Athens (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7232135
- Report Number(s):
- LA-UR-86-3588; CONF-8610167-1; ON: DE87001970
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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CARBON 13 TARGET
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ENERGY-LEVEL TRANSITIONS
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LITHIUM 6 TARGET
LITHIUM 7 TARGET
MAGNESIUM 26 TARGET
MATHEMATICAL MODELS
NITROGEN 15 TARGET
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NUCLEAR REACTIONS
NUCLEON REACTIONS
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QUENCHING
SHELL MODELS
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