Parity nonconservation in {sup 106}Pd and {sup 108}Pd neutron resonances

Journal Article · Mon Nov 01 00:00:00 EST 1999 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.60.055503· OSTI ID:688074

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

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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. Physics Department, Kyoto University, Kyoto 606-01 (Japan)
5. North Carolina State University, Raleigh, North Carolina 27695-8202 and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
6. Delft University of Technology, Delft, 2629 JB (The Netherlands)
7. Joint Institute for Nuclear Research, 141980 Dubna (Russia)

Parity nonconservation (PNC) has been studied in the neutron {ital p}-wave resonances of {sup 106}Pd and {sup 108}Pd in the energy range of 20 to 2000 eV. Longitudinal asymmetries in {ital p}-wave capture cross sections are measured using longitudinally polarized neutrons incident on {approximately}20-g metal-powder targets at LANSCE. A CsI {gamma}-ray detector array measures capture cross section asymmetries as a function of neutron energy which is determined by the neutron time-of-flight method. A total of 21 {ital p}-wave resonances in {sup 106}Pd and 21 {ital p}-wave resonances in {sup 108}Pd were studied. One statistically significant PNC effect was observed in {sup 106}Pd, and no effects were observed in {sup 108}Pd. For {sup 106}Pd a weak spreading width of {Gamma}{sub w}=34{sub {minus}28}{sup +47}{times}10{sup {minus}7} eV was obtained. For {sup 108}Pd an upper limit on the weak spreading width of {Gamma}{sub w}{lt}12{times}10{sup {minus}7} eV was determined at the 68{percent} confidence level. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 688074
• Journal Information: Physical Review, C, Vol. 60, Issue 5; Other Information: PBD: Nov 1999
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
PARITY
PALLADIUM 106 TARGET
PALLADIUM 108 TARGET
PROTON-NEUTRON INTERACTIONS
POLARIZATION
RESONANCE NEUTRONS
P INVARIANCE
CROSS SECTIONS
CAPTURE