Parity nonconservation for neutron resonances in sup 232 Th

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.778· OSTI ID:7286515

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

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1. North Carolina State University, Raleigh, North Carolina 27695 (United States) Triangle Universities Nuclear Laboratory, Durham, North Carolina 27706 (United States) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) TRIUMF, Vancouver, British Columbia, V6T 2A3 (Canada) University of Technology, P.O. Box 5046, 2600 GA, Delft (Netherlands) Duke University, Durham, North Carolina 27706 (United States) Triangle Universities Nuclear Laboratory, Durham, North Carolina 27706 (United States)

Parity nonconserving (PNC) longitudinal analyzing powers were measured for 23 {ital p}-wave neutron resonances in {sup 232}Th. Seven resonances show effects of greater than 2.4{sigma} statistical significance---the largest sample yet measured in a single nucleus. All seven analyzing powers have positive sign. Strong sign correlations are not a feature of the conventional statistical model of parity mixing between compound nuclear states. The asymmetry was expressed as a sum of two terms: a constant asymmetry and a fluctuating asymmetry. With this ansatz the root-mean-square PNC matrix element {ital M}=1.2{sub {minus}0.4}{sup +0.5} meV, which corresponds to a spreading width of {Gamma}{sup PV}=6{times}10{sup {minus}7} eV.

• DOE Contract Number: FG05-88ER40441; FG05-91ER40619; W-7405-ENG-36
• OSTI ID: 7286515
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 46:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEUTRON REACTIONS
P INVARIANCE
THORIUM 232 TARGET
ANALYZING POWER
EPITHERMAL NEUTRONS
MATRIX ELEMENTS
NUCLEON-NUCLEON INTERACTIONS
RESONANCE SCATTERING
SYMMETRY BREAKING
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BARYONS
ELEMENTARY PARTICLES
FERMIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INELASTIC SCATTERING
INTERACTIONS
INVARIANCE PRINCIPLES
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
SCATTERING
TARGETS
663430* - Nucleon-Induced Reactions & Scattering- (1992-)
663590 - Nuclear Mass Ranges- A=220 & Above- (1992-)