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Parity violation in the 0. 734-eV neutron resonance in /sup 139/La

Journal Article · · Phys. Rev. C; (United States)
; ;
The degree of parity mixing in the 0.734-eV neutron resonance in /sup 139/La was measured in a two-sample transmission experiment. An unpolarized neutron beam was weakly polarized in the longitudinal direction at energies near the resonance by transmission through a La/sub 2/O/sub 3/ sample. The beam was passed through a spin flipper and then through a second sample of La/sub 2/O/sub 3/. The difference in transmission for the two spin directions was then measured to determine the longitudinal asymmetry. We obtain 9.2 +- 1.7 % s-wave mixing into this p-wave resonance, which is consistent with earlier measurements using polarized beams in single transmission experiments. Because parity mixing is an attribute of the weak force, the experiment demonstrates the remarkable enhancement in the weak force in neutron resonances: an effect large enough to allow polarization of a neutron beam. Experiments of this class are described which should permit the first systematic study of the manifestation of the weak force in complex nuclei.
Research Organization:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
OSTI ID:
6269247
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BARYON REACTIONS
BEAMS
CROSS SECTIONS
HADRON REACTIONS
HELICITY
INELASTIC SCATTERING
INVARIANCE PRINCIPLES
LANTHANUM 139 TARGET
MATHEMATICAL MODELS
MATRIX ELEMENTS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
P INVARIANCE
P WAVES
PARTIAL WAVES
PARTICLE MODELS
PARTICLE PROPERTIES
POLARIZED BEAMS
RESONANCE SCATTERING
S WAVES
SCATTERING
SINGLE-PARTICLE MODEL
SPIN FLIP
T INVARIANCE
TARGETS