The poor agreement for low-energy p
A scattering has made it necessary to introduce the corrections
proposed in Refs. 24 and 51 in the p A
potential. In the present work, we have considered three types of corrections:
the correction for two-nucleon absorption, inclusion of the Ericson - Ericson
factor (allowance for two-nucleon correlations), and inclusion of the Fermi
motion of the nucleons (in the s and p elementary
amplitudes).
Our analysis has shown that the agreement for the
integral characteristics of the m p +,-
12C interaction is substantially improved by taking into account
the Ericson - Ericson factor and two-nucleon absorption [24-
26] (see Figs. 7a and 7b), while the
other corrections have little effect on the calculated quantities. Improvements
are also observed in the differential cross sections for elastic p-
12C scattering (Fig. 10), but
for p+ 12C scattering
(see Fig. 9) the agreement becomes worse.
This is apparently due to the fact that the phenomenological parameters
of the potential are obtained from data on p-
mesic atoms. It is not possible to obtain substantial improvements for
the p d interaction (see Figs. 7c,
7d, and 8).
In order to clarify the extent to which two-nucleon
correlations affect the K+ A and NA potentials,
we performed calculations of these interactions with inclusion of the Ericson
- Ericson factor in the potential (1).. We found that inclusion of this
factor leads to small changes in the calculated quantities. It should be
noted that a similar analysis of the second-order corrections to the potential
in the impulse approximation, carried out in Ref.
56, also indicates that they give a small contribution to the measured
quantities.
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