A. Aleksejevs et al., Theoretical evaluation of neutron-nucleus scattering parameters from experimental data in the 6 <= A < 60 mass region, Z NATURFO A, 53(10-11), 1998, pp. 855-862
Citations number
12
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
Systematic calculations of the neutron-nucleus scattering parameters at sev
eral neutron energies E-i < 2 keV have been performed for 37 isotopes (Li-6
, ... Co-59) in the mass region of 6 less than or equal to A less than or e
qual to 60, using the large compilation of experimental neutron-nucleus sca
ttering data obtained in Garching. In the first stage of these calculations
, the s-wave potential scattering radius R', the scattering lengths b(coh),
b(+/-), and the bound state parameters (E-b, Gamma(gamma r), g Gamma(n)(0)
) have been calculated for each isotope, employing the general least square
s fit (GLSQF) for the experimental and the corresponding theoretical values
of the total neutron-nucleus cross sections sigma(tot)(exp)(E-i) at severa
l energies E-i, absorption cross sections sigma(abs)(E-0) and of the cohere
nt scattering lengths b(coh). The theoretical expressions for these paramet
ers were deduced on the basis of the usual S-matrix formalism with no assum
ption about the particular shape of the optical model potential. In the sec
ond stage of our calculations, the spherical Fiedeldey-Frahn optical potent
ial was employed for the pure theoretical description or the above mentione
d neutron-nucleus scattering characteristics. The results obtained have bee
n analyzed and compared with the values deduced from measurements.