Parity and time-reversal symmetry nonconservation in neutron-nucleus interactions

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6782963

Bowman, J D; Bowman, C D; Knudson, J; Penttilae, S; Seestrom, S J; Szymanski, J J; Yuan, V W ^[1]; Bush, J E; Frankle, C M; Gould, C R; Haase, D G; Mitchell, G E ^[2]; Delheij, P P.J. ^[3]; Postma, H ^[4]

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1. Los Alamos National Lab., NM (USA)
2. North Carolina State Univ., Raleigh, NC (USA) Triangle Universities Nuclear Lab., Durham, NC (USA)
3. TRIUMF, Vancouver, BC (Canada)
4. Technische Hogeschool Delft (Netherlands

Parity non-conversation was studied for seventeen states in the compound nucleus {sup 239}U by measuring the helicity dependence of the p-wave resonance cross section for epithermal neutrons scattered from {sup 238}U. The root-mean-squared parity-violating matrix element for the mixing of p-wave and s-wave states was determined to be M = 0.58{sub -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. This gives a value of 4 {times} 10{sup {minus}7} for {alpha}{sub p}, the ratio of strengths of the P-odd and P-even effective nucleon-nucleon interactions in {sup 239}U. The implications of these results for studies of Time Reversal Symmetry in the compound nucleus is discussed.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-36; AC05-76ER01067; FG05-88ER40441
• OSTI ID: 6782963
• Report Number(s): LA-UR-90-3193; CONF-9005233-5; ON: DE91000425; TRN: 91-000435
• Resource Relation: Conference: 2. international conference on medium- and high-energy physics, Taipei (Taiwan), 8-18 May 1990
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
NUCLEON-NUCLEON INTERACTIONS
P INVARIANCE
T INVARIANCE
URANIUM 238 TARGET
NEUTRON REACTIONS
COMPOUND NUCLEI
CROSS SECTIONS
MATRIX ELEMENTS
P WAVES
S WAVES
URANIUM 239
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
EVEN-ODD NUCLEI
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HEAVY NUCLEI
INTERACTIONS
INVARIANCE PRINCIPLES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARTIAL WAVES
PARTICLE INTERACTIONS
RADIOISOTOPES
TARGETS
URANIUM ISOTOPES
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental
645300 - High Energy Physics- Particle Invariance Principles & Symmetries