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

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.589· OSTI ID:7015069

McAninch, J E; Lamm, L O; Haeberli, W ^[1]

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1. 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), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:2; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BARYONS
BEAMS
CHARGED-PARTICLE REACTIONS
DEUTERIUM TARGET
ELASTIC SCATTERING
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
EVEN-ODD NUCLEI
FADDEEV EQUATIONS
FERMIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HELIUM 3
HELIUM ISOTOPES
INTERACTIONS
ISOTOPES
LIGHT NUCLEI
MANY-BODY PROBLEM
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
POLARIZATION
POLARIZED BEAMS
PROTON REACTIONS
SCATTERING
STABLE ISOTOPES
TARGETS
THREE-BODY PROBLEM
TRITIUM TARGET