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Quenching of Gamow-Teller strength

Conference ·
DOI:https://doi.org/10.1139/p87-081· OSTI ID:7232135

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
BARYON REACTIONS
BERYLLIUM 9 TARGET
BETA DECAY
BORON 11 TARGET
CARBON 12 TARGET
CARBON 13 TARGET
CARBON 14 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DECAY
DIFFERENTIAL CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
FLUORINE 19 TARGET
GAMOW-TELLER RULES
HADRON REACTIONS
INFORMATION
LITHIUM 6 TARGET
LITHIUM 7 TARGET
MAGNESIUM 26 TARGET
MATHEMATICAL MODELS
NITROGEN 15 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
POTASSIUM 39 TARGET
PROTON REACTIONS
QUENCHING
SHELL MODELS
TARGETS