Parity conserving gamma asymmetry in n-p radiative capture

Details Parity conserving gamma asymmetry in n-p radiative capture Parity conserving gamma asymmetry in n-p radiative capture

1997-04-28

arxiv.org/abs/nucl-th/9704063v1

Phys.Rev.C56:631-634,1997

Physics

Nuclear Physics

Nuclear Theory

8 pages

Scientific paper

10.1103/PhysRevC.56.631

The importance of n-p radiative capture, utilizing polarized cold neutrons, as a means of measuring the weak pion coupling constant is reviewed. Parity conserving processes of the form k_gamma*[s_n,k_n] can contribute to the s_n*k_gamma photon asymmetry in any such experiment, if the apparatus is not perfectly symmetric. For an incident laboratory neutron energy of 0.003 eV a value of A^{PC}_{gamma}=0.67*10^{-8} is obtained for two different potential models (Argonne AV14 and Nijmegen Reid93). Serving as an extreme test case, the Reid soft core potential yields 0.61*10^{-8}, close to the result of the contemporary forces. Implications for extracting the weak pion coupling constant and for monitoring the beam polarization are discussed.

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