The sum and energy-weighted sum of isovector spin-longitudinal and -transverse response of , , , and nuclear matter are studied with realistic models of nuclear forces. The results for are compared with those obtained using effective interactions and the random-phase approximation. The responses of are also calculated. We confirm the earlier predictions that nuclear forces enhance the isovector spin-longitudinal response over the spin-transverse. However, we find that they also push the strength of both these responses to higher energies. Indications of the predicted enhancement have not been observed in p→,n→ experiments on and recently carried out at Los Alamos. We find that conventional nuclear theory predicts a measurable enhancement in and a significant enhancement in . Since many properties of these few-body nuclei are well explained with realistic nuclear forces an experimental verification of the enhancement, or its absence, in and will be very interesting.
- Received 11 October 1993
- Published in the issue dated February 1994
© 1994 The American Physical Society