Parity nonconservation in neutron resonances in {sup 238}U

Journal Article · Sat Aug 01 04:00:00 EDT 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.1225· OSTI ID:639197

Crawford, B E; Roberson, N R ^[1]; Bowman, J D; Frankle, C M; Knudson, J N; Penttilae, S I; Seestrom, S J; Yen, Y; Yuan, V W ^[2]; Delheij, P P ^[3]; Iinuma, M; Masaike, A; Matsuda, Y ^[4]; Lowie, L Y; Mitchell, G E; Stephenson, S L ^[5]; Postma, H ^[6]; Sharapov, E I ^[7]

---

1. Duke University, Durham, North Carolina 27708 and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. TRIUMF, Vancouver, British Columbia, V6T 2A3 (CANADA)
4. Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)
5. North Carolina State University, Raleigh, North Carolina 27695-8202 and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
6. University of Technology, Delft, 2600 GA (the Netherlands)
7. Joint Institute for Nuclear Research, 141980 Dubna (Russia)

Parity nonconservation (PNC) was studied for 24 {ital p}-wave neutron resonances in {sup 238}U from 10 to 300 eV by measuring the helicity dependence of the total neutron cross section with an improved experimental apparatus. Six resonances show statistically significant (greater than 2.9{sigma}) parity violation. An analysis treating the PNC matrix elements as random variables yields a root-mean-square PNC matrix element M=0.67{sub {minus}0.16}{sup +0.24} meV. The corresponding weak spreading width {Gamma}{sub w}=(1.35{sub {minus}0.64}{sup +0.97}){times}10{sup {minus}7} eV. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 639197
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 58; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELICITY
MATRIX ELEMENTS
NEUTRON REACTIONS
P WAVES
PARITY
RESONANCE NEUTRONS
SENSITIVITY
SYMMETRY BREAKING
TOTAL CROSS SECTIONS
URANIUM 238