Ratio of the Isovector Spin-Flip to Nonflip Effective Interaction from 0  (p, n) Scattering

Abstract

779Relativistic analyses of the ratio of the isovector spin-flip to nonspin-flip effective NN interaction strength from the Gamow-Teller and Fermi transitions in O' (p, n) scattering are performed using the factorized relativistic distorted-wave impulse approximation. Our relativistic calculation using the NN interaction with a pseudoscalar coupling is similar to the nonrelativistic result. On the other hand, the calculation with a pseudovector coupling in the place of pseudoscalar one can give large values of the ratios in the intermediate-energy range from 300 to 500 MeV, but is smaller than the nonrelativistic result and the experimental data in the low-energy range below 200 MeV. This suggests that the important relativistic effect due to the negative-energy contribution may be apparent in the ratio. . by guest on August 11, 2015 http://ptp.oxfordjournals.org/ Downloaded from