Radiative neutron capture on He3

Phys. Rev. C 42, 830 – Published 1 September 1990
J. Carlson, D. O. Riska, R. Schiavilla, and R. B. Wiringa


The thermal neutron cross section for the reaction n+3He4He+γ is calculated with the Monte Carlo method from realistic variational wave functions obtained for the Argonne v14 two-nucleon and Urbana VII three-nucleon interaction models. The calculated cross section is found to be almost entirely due to exchange currents. With the exchange current operator constructed so as to satisfy the continuity equation with the Argonne v14 interaction, the calculated cross section is 71 μb, which is close to the empirical value 54±6 μb. The less certainly known contributions from model-dependent exchange current mechanisms increase the predicted value to about 112 μb. The calculated cross section depends strongly on the n+3He scattering length, varying between 140 and 71 μb as the scattering length is changed from 3.25 to 3.75 fm.

DOI: http://dx.doi.org/10.1103/PhysRevC.42.830

  • Received 2 April 1990
  • Published in the issue dated September 1990

© 1990 The American Physical Society

Authors & Affiliations

J. Carlson

  • Theory Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

D. O. Riska

  • Department of Physics, University of Helsinki, 00170 Helsinki, Finland

R. Schiavilla

  • Continuous Electron Beam Accelerator Facility, Newport News, Virginia 23606

R. B. Wiringa

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

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