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Title: Analyzing power in neutron-deuteron elastic scattering at [ital E][sub lab][sup [ital n]]=3 MeV

Abstract

A measurement of the analyzing power [ital A][sub [ital y]]([theta]) in neutron-deuteron ([ital n]-[ital d]) elastic scattering below the deuteron breakup threshold is described, including a detailed discussion of the experimental apparatus and the treatment of systematic errors. The data provide a precise test of Faddeev calculations of the three-nucleon system and of the nucleon-nucleon interaction models used as inputs to these calculations. [ital A][sub [ital y]] was measured at six angles from 44.5 [degree] c.m. to 145.7 [degree] c.m. to a precision of (7--13)[times]10[sup [minus]4]. Polarized neutrons, produced by the [sup 3]H([ital [rvec p]],[ital [rvec n]])[sup 3]He reaction, were incident upon the target, a deuterated organic scintillator. Scattered neutrons were detected in fast coincidence with the recoil deuterons in the target. A computer simulation of the experiment was used to compensate for a number of systematic errors. Particularly important were corrections for neutron multiple scattering, accidental coincidences, and finite geometry effects. The [ital A][sub [ital y]] data have a 2.2% scale factor uncertainty associated with uncertainty in the polarization of the incident neutron beam. The incident neutron polarization was measured in a separate experiment using [ital n]-[sup 4]He scattering from a liquid helium scintillator. The neutron polarization measurement alsomore » yielded an improved value for the polarization transfer coefficient [[ital K][sub [ital y]][sup [ital y]](0[sup [degree]])=0.650[plus minus]0.019] in the [sup 3]H([ital [rvec p]],[ital [rvec n]])[sup 3]He reaction at [ital E][sub lab][sup [ital p]]=3.80 MeV. A comparison of the [ital A][sub [ital y]] data to Faddeev calculations shows that the discrepancy in [ital A][sub [ital y]] observed previously at higher energies continues below the breakup threshold. The [ital A][sub [ital y]] data are compared to a recent phase shift analysis of proton-deuteron scattering.« less

Authors:
; ;  [1]
  1. Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
7015069
Resource Type:
Journal Article
Journal Name:
Physical Review, C (Nuclear Physics); (United States)
Additional Journal Information:
Journal Volume: 50:2; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DEUTERIUM TARGET; NEUTRON REACTIONS; ANALYZING POWER; TRITIUM TARGET; PROTON REACTIONS; ELASTIC SCATTERING; FADDEEV EQUATIONS; HELIUM 3; MEV RANGE 01-10; NEUTRONS; NUCLEON-NUCLEON INTERACTIONS; POLARIZATION; POLARIZED BEAMS; THREE-BODY PROBLEM; BARYON REACTIONS; BARYON-BARYON INTERACTIONS; BARYONS; BEAMS; CHARGED-PARTICLE REACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; EQUATIONS; EVEN-ODD NUCLEI; FERMIONS; HADRON REACTIONS; HADRON-HADRON INTERACTIONS; HADRONS; HELIUM ISOTOPES; INTERACTIONS; ISOTOPES; LIGHT NUCLEI; MANY-BODY PROBLEM; MEV RANGE; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; NUCLEONS; PARTICLE INTERACTIONS; SCATTERING; STABLE ISOTOPES; TARGETS; 663430* - Nucleon-Induced Reactions & Scattering- (1992-); 663300 - Nuclear Reactions & Scattering, General- (1992-)

Citation Formats

McAninch, J E, Lamm, L O, and Haeberli, W. Analyzing power in neutron-deuteron elastic scattering at [ital E][sub lab][sup [ital n]]=3 MeV. United States: N. p., 1994. Web. doi:10.1103/PhysRevC.50.589.
McAninch, J E, Lamm, L O, & Haeberli, W. Analyzing power in neutron-deuteron elastic scattering at [ital E][sub lab][sup [ital n]]=3 MeV. United States. doi:10.1103/PhysRevC.50.589.
McAninch, J E, Lamm, L O, and Haeberli, W. Mon . "Analyzing power in neutron-deuteron elastic scattering at [ital E][sub lab][sup [ital n]]=3 MeV". United States. doi:10.1103/PhysRevC.50.589.
@article{osti_7015069,
title = {Analyzing power in neutron-deuteron elastic scattering at [ital E][sub lab][sup [ital n]]=3 MeV},
author = {McAninch, J E and Lamm, L O and Haeberli, W},
abstractNote = {A measurement of the analyzing power [ital A][sub [ital y]]([theta]) in neutron-deuteron ([ital n]-[ital d]) elastic scattering below the deuteron breakup threshold is described, including a detailed discussion of the experimental apparatus and the treatment of systematic errors. The data provide a precise test of Faddeev calculations of the three-nucleon system and of the nucleon-nucleon interaction models used as inputs to these calculations. [ital A][sub [ital y]] was measured at six angles from 44.5 [degree] c.m. to 145.7 [degree] c.m. to a precision of (7--13)[times]10[sup [minus]4]. Polarized neutrons, produced by the [sup 3]H([ital [rvec p]],[ital [rvec n]])[sup 3]He reaction, were incident upon the target, a deuterated organic scintillator. Scattered neutrons were detected in fast coincidence with the recoil deuterons in the target. A computer simulation of the experiment was used to compensate for a number of systematic errors. Particularly important were corrections for neutron multiple scattering, accidental coincidences, and finite geometry effects. The [ital A][sub [ital y]] data have a 2.2% scale factor uncertainty associated with uncertainty in the polarization of the incident neutron beam. The incident neutron polarization was measured in a separate experiment using [ital n]-[sup 4]He scattering from a liquid helium scintillator. The neutron polarization measurement also yielded an improved value for the polarization transfer coefficient [[ital K][sub [ital y]][sup [ital y]](0[sup [degree]])=0.650[plus minus]0.019] in the [sup 3]H([ital [rvec p]],[ital [rvec n]])[sup 3]He reaction at [ital E][sub lab][sup [ital p]]=3.80 MeV. A comparison of the [ital A][sub [ital y]] data to Faddeev calculations shows that the discrepancy in [ital A][sub [ital y]] observed previously at higher energies continues below the breakup threshold. The [ital A][sub [ital y]] data are compared to a recent phase shift analysis of proton-deuteron scattering.},
doi = {10.1103/PhysRevC.50.589},
journal = {Physical Review, C (Nuclear Physics); (United States)},
issn = {0556-2813},
number = ,
volume = 50:2,
place = {United States},
year = {1994},
month = {8}
}