Energy dependence of the imaginary central optical potential for n{sup {minus}208} Pb scattering

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:387091

Shamu, R E; Ferguson, S M; Schutt, R L

We have performed a phenomenological optical-model analysis of n-{sup 208}Pb scattering up to 240 MeV to determine whether or not the energy dependence of the absorptive potential is strongly correlated to the opening (or closing) of neutron-induced reaction channels. In agreement with our earlier work, we find that the surface imaginary strength W{sub D}(E) and the volume imaginary strength W{sub v}(E) appear to change slope near the {sup 208}Pb(n,2n) threshold at 7.4 MeV and the {sup 208}Pb(n,3n) threshold at 14.2 MeV, respectively. We find, also, that W{sub D}(E) changes slope near 14 MeV and that both strengths change slope at about 60 MeV. This latter energy is near the Is neutron binding energy in {sup 208}Pb, 62.4 MeV. Finally, agreement with {sigma}{sub t} data for E > 140 MeV is improved significantly if W{sub v}(E) is modified to take into account pion production.

• OSTI ID: 387091
• Report Number(s): CONF-931044--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ENERGY DEPENDENCE
LEAD 208 TARGET
NEUTRON REACTIONS
SCATTERING