Measurements of 1H(d,γ)3He and 2H(p,γ)3He at very low energies

L. Ma, H. J. Karwowski, C. R. Brune, Z. Ayer, T. C. Black, J. C. Blackmon, E. J. Ludwig, M. Viviani, A. Kievsky, and R. Schiavilla
Phys. Rev. C 55, 588 – Published 1 February 1997
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Abstract

Angular distributions of the analyzing powers iT11, T20, and T22 for 1H(d,γ)3He at 40<~Ec.m.<~110 keV and the angular distribution of the analyzing power Ay for 2H(p,γ)3He at 70<~Ec.m.<~210 keV have been measured for the first time. In addition, absolute differential cross sections for proton-deuteron capture have been determined for Ec.m.= 75, 108, 133, and 173 keV. Thick ice or heavy ice targets and two large-volume, high-purity Ge γ-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 25% lower than that presently used in astrophysical calculations. An expression for the thermonuclear reaction rate below 10 GK is given.

  • Received 30 August 1996

DOI:https://doi.org/10.1103/PhysRevC.55.588

©1997 American Physical Society

Authors & Affiliations

L. Ma, H. J. Karwowski, C. R. Brune, Z. Ayer, T. C. Black, J. C. Blackmon, and E. J. Ludwig

  • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255
  • Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708

M. Viviani and A. Kievsky

  • Istituto Nazionale di Fisica Nucleare, Piazza Torricelli 2, 56100 Pisa, Italy

R. Schiavilla

  • Jefferson Lab Theory Group, Newport News, Virginia 23606
  • Department of Physics, Old Dominion University, Norfolk, Virginia 23529

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Vol. 55, Iss. 2 — February 1997

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