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Comment on Neutron-Proton Spin-Correlation Parameter A_{ZZ} at 68 Mev by Machleidt, R.; Slaus, I. is a scholarly article available to read on EtoBox.

What is Comment on Neutron-Proton Spin-Correlation Parameter A_{ZZ} at 68 Mev about?

We present two arguments indicating that the large value for the $\epsilon_1$ mixing parameter at 50 MeV, which the Basel group extracted from their recent $A_{zz}$ measurement, may be incorrect. First, there are nucleon-nucleon (NN) potentials which predict the $\epsilon_1$ at 50 MeV substantially below the Basel value and reproduce the Basel $A_{zz}$ data accurately. Second, the large value for $\epsilon_1$ at 50 MeV proposed by the Basel group can only be explained by a model for the NN interaction which is very unrealistic (no $\rho$-meson and essentially a point-like $\pi NN$ vertex) and overpredicts the $\epsilon_1$ in the energy range where it is well determined (150--500 MeV) by a factor of two.

Author

Machleidt, R.; Slaus, I.

Published

1993

Language

EN