Parity nonconservation for neutron resonances in sup 238 U

Journal Article · Mon Sep 03 00:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.1192· OSTI ID:6476953

Bowman, J D; Bowman, C D; Bush, J E; Delheij, P P.J.; Frankle, C M; Gould, C R; Haase, D G; Knudson, J; Mitchell, G E; Penttila, S; Postma, H; Roberson, N R; Seestrom, S J; Szymanski, J J; Yuan, V W; Zhu, X ^[1]

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1. Los Alamos National Laboratory, Los Alamos, NM (USA) North Carolina State University, Raleigh, NC (USA) Triangle Universities Nuclear Laboratory, Durham, NC (USA) TRIUMF, Vancouver (Canada) University of Technology, Delft (The Netherlands) Duke University, Durham, NC (USA) Triangle Universities Nuclear Laboratory, Durham, NC (USA)

Parity nonconservation was studied for seventeen states in {sup 239}U by measuring the helicity dependence of the total cross section for epithermal neutrons scattered from {sup 238}U. The root-mean-squared parity-violating matrix element for the mixing of {ital p}-wave and {ital s}-wave states was determined to be {ital M}=0.58{sub {minus}0.25}{sup +0.50} meV. This corresponds to a parity-violating spreading width of {Gamma}{sup PV}=1.0{times}10{sup {minus}7} eV. Under plausible assumptions this gives a value of 4{times}10{sup {minus}7} for {vert bar}{alpha}{sub {ital P}}{vert bar}, the ratio of strengths of the {ital P}-odd and {ital P}-even effective nucleon-nucleon interactions.

• DOE Contract Number: AC05-76ER01067; FG05-88ER40441
• OSTI ID: 6476953
• Journal Information: Physical Review Letters; (USA), Vol. 65:10; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEUTRON REACTIONS
TOTAL CROSS SECTIONS
NUCLEON-NUCLEON INTERACTIONS
P INVARIANCE
URANIUM 238 TARGET
EV RANGE 10-100
EXPERIMENTAL DATA
HELICITY
POLARIZED BEAMS
SYMMETRY BREAKING
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BEAMS
CROSS SECTIONS
DATA
ENERGY RANGE
EV RANGE
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
INVARIANCE PRINCIPLES
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
TARGETS
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental