Measurements of {sup 1}H({rvec d},{gamma}){sup 3}He and {sup 2}H({rvec p},{gamma}){sup 3}He at very low energies
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255 (United States)
- Istituto Nazionale di Fisica Nucleare, Piazza Torricelli 2, 56100 Pisa (Italy)
- Jefferson Lab Theory Group, Newport News, Virginia 23606 (United States)
Angular distributions of the analyzing powers iT{sub 11}, T{sub 20}, and T{sub 22} for {sup 1}H({rvec d},{gamma}){sup 3}He at 40{le}E{sub c.m.}{le}110 keV and the angular distribution of the analyzing power A{sub y} for {sup 2}H({rvec p},{gamma}){sup 3}He at 70{le}E{sub c.m.}{le}210 keV have been measured for the first time. In addition, absolute differential cross sections for proton-deuteron capture have been determined for E{sub c.m.}= 75, 108, 133, and 173 keV. Thick ice or heavy ice targets and two large-volume, high-purity Ge {gamma}-ray detectors were used. Results are in general agreement with an exact three-body calculation utilizing a realistic nucleon-nucleon potential. The vector-polarization observables are found to be especially sensitive to meson-exchange-current effects. The extracted S(0) value for proton-deuteron capture is {approximately}25{percent} lower than that presently used in astrophysical calculations. An expression for the thermonuclear reaction rate below 10 GK is given. {copyright} {ital 1997} {ital The American Physical Society}
- DOE Contract Number:
- FG05-88ER40442
- OSTI ID:
- 450481
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 55; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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