Analyzing power in neutron-deuteron elastic scattering at [ital E][sub lab][sup [ital n]]=3 MeV
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
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.
- OSTI ID:
- 7015069
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Vol. 50:2; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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-)