Measurements of 1H(d-vector,gamma)3 and 2H(p-vector,gamma)3He at Very Low Energies
Angular distributions of the analyzing powers iT{sub 11}, T{sub 20}, and T{sub 22} for {sup 1}H(d-vector,gamma){sup 3}He at 40 <= E{sub c.m.} <= 110 keV and the angular distribution of the analyzing power A{sub y} for {sup 2}H(p-vector,gamma){sup 3}He at 70 <= E{sub c.m.} <= 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 {approx} 25% lower than that presently used in astrophysical calculations. An expression for the thermonuclear reaction rate below 10 GK is given.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 804151
- Report Number(s):
- JLAB-THY-97-53; DOE/ER/40150-2352
- Journal Information:
- Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 55
- Country of Publication:
- United States
- Language:
- English
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