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Title: Neutron scattering from /sup 29/Si and /sup 32/S: cross sections and analyzing powers from 8 to 40 MeV

Abstract

Analyzing powers A/sub y/(theta) for neutron scattering to the ground and first excited states of natural silicon and sulfur from 20/sup 0/ to 155/sup 0/ cm have been measured at incident neutron energies of 10, 14, and 17 MeV. To obtain these data, the O/sup 0/ neutrons from the /sup 2/H(d vector,n/sup 0/ vector)/sup 3/He polarization transfer reaction were scattered from cylindrical samples into two symmetrically positioned side detectors. Pulsing the polarized deuteron beam permitted the use of time-of-flight detection techniques. The corresponding differential cross sections sigma(theta) at 8, 10, 12, 14, and 17 MeV were measured with the same detector system but using an unpolarized beam. Both A/sub y/(theta) and sigma(theta) data were corrected for flux attenuation, angular resolution, and multiple scattering. These data have been described with spherical optical-models and with phenomenological coupled-channels calculations. To minimize the ambiguities in the optical-model parameters, sigma(theta) data for incident neutron energies ranging from 10 to 40 MeV, which were previously reported, were included in this analysis. For both nuclei, a square-root energy dependence on the strength of the real potential was necessary to describe the published neutron total cross sections at energies below 3.0 MeV.

Authors:
Publication Date:
Research Org.:
Duke Univ., Durham, NC (USA)
OSTI Identifier:
5928539
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRON REACTIONS; INELASTIC SCATTERING; SILICON 28 TARGET; SULFUR 32 TARGET; ANALYZING POWER; ANGULAR DISTRIBUTION; COUPLED CHANNEL THEORY; CROSS SECTIONS; ENERGY DEPENDENCE; EXPERIMENTAL DATA; MEV RANGE 10-100; OPTICAL MODELS; BARYON REACTIONS; DATA; DISTRIBUTION; ENERGY RANGE; HADRON REACTIONS; INFORMATION; MEV RANGE; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUMERICAL DATA; SCATTERING; TARGETS; 651425* - Nuclear Properties & Reactions, A=20-38, Experimental- Nuclear Reactions & Scattering- (-1987)

Citation Formats

Howell, C R. Neutron scattering from /sup 29/Si and /sup 32/S: cross sections and analyzing powers from 8 to 40 MeV. United States: N. p., 1984. Web.
Howell, C R. Neutron scattering from /sup 29/Si and /sup 32/S: cross sections and analyzing powers from 8 to 40 MeV. United States.
Howell, C R. 1984. "Neutron scattering from /sup 29/Si and /sup 32/S: cross sections and analyzing powers from 8 to 40 MeV". United States.
@article{osti_5928539,
title = {Neutron scattering from /sup 29/Si and /sup 32/S: cross sections and analyzing powers from 8 to 40 MeV},
author = {Howell, C R},
abstractNote = {Analyzing powers A/sub y/(theta) for neutron scattering to the ground and first excited states of natural silicon and sulfur from 20/sup 0/ to 155/sup 0/ cm have been measured at incident neutron energies of 10, 14, and 17 MeV. To obtain these data, the O/sup 0/ neutrons from the /sup 2/H(d vector,n/sup 0/ vector)/sup 3/He polarization transfer reaction were scattered from cylindrical samples into two symmetrically positioned side detectors. Pulsing the polarized deuteron beam permitted the use of time-of-flight detection techniques. The corresponding differential cross sections sigma(theta) at 8, 10, 12, 14, and 17 MeV were measured with the same detector system but using an unpolarized beam. Both A/sub y/(theta) and sigma(theta) data were corrected for flux attenuation, angular resolution, and multiple scattering. These data have been described with spherical optical-models and with phenomenological coupled-channels calculations. To minimize the ambiguities in the optical-model parameters, sigma(theta) data for incident neutron energies ranging from 10 to 40 MeV, which were previously reported, were included in this analysis. For both nuclei, a square-root energy dependence on the strength of the real potential was necessary to describe the published neutron total cross sections at energies below 3.0 MeV.},
doi = {},
url = {https://www.osti.gov/biblio/5928539}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}

Thesis/Dissertation:
Other availability
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