skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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}

Authors:
;  [1]; ; ; ; ;  [2];  [3]; ; ;  [4]; ; ;  [5];  [6];  [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. 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)
Publication Date:
OSTI Identifier:
688074
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 60; Journal Issue: 5; Other Information: PBD: Nov 1999
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; PARITY; PALLADIUM 106 TARGET; PALLADIUM 108 TARGET; PROTON-NEUTRON INTERACTIONS; POLARIZATION; RESONANCE NEUTRONS; P INVARIANCE; CROSS SECTIONS; CAPTURE

Citation Formats

Crawford, B E, Roberson, N R, Bowman, J D, Knudson, J N, Penttilae, S I, Seestrom, S J, Yuan, V W, Delheij, P P, Haseyama, T, Masaike, A, Matsuda, Y, Lowie, L Y, Mitchell, G E, Stephenson, S L, Postma, H, and Sharapov, E I. Parity nonconservation in {sup 106}Pd and {sup 108}Pd neutron resonances. United States: N. p., 1999. Web. doi:10.1103/PhysRevC.60.055503.
Crawford, B E, Roberson, N R, Bowman, J D, Knudson, J N, Penttilae, S I, Seestrom, S J, Yuan, V W, Delheij, P P, Haseyama, T, Masaike, A, Matsuda, Y, Lowie, L Y, Mitchell, G E, Stephenson, S L, Postma, H, & Sharapov, E I. Parity nonconservation in {sup 106}Pd and {sup 108}Pd neutron resonances. United States. https://doi.org/10.1103/PhysRevC.60.055503
Crawford, B E, Roberson, N R, Bowman, J D, Knudson, J N, Penttilae, S I, Seestrom, S J, Yuan, V W, Delheij, P P, Haseyama, T, Masaike, A, Matsuda, Y, Lowie, L Y, Mitchell, G E, Stephenson, S L, Postma, H, and Sharapov, E I. 1999. "Parity nonconservation in {sup 106}Pd and {sup 108}Pd neutron resonances". United States. https://doi.org/10.1103/PhysRevC.60.055503.
@article{osti_688074,
title = {Parity nonconservation in {sup 106}Pd and {sup 108}Pd neutron resonances},
author = {Crawford, B E and Roberson, N R and Bowman, J D and Knudson, J N and Penttilae, S I and Seestrom, S J and Yuan, V W and Delheij, P P and Haseyama, T and Masaike, A and Matsuda, Y and Lowie, L Y and Mitchell, G E and Stephenson, S L and Postma, H and Sharapov, E I},
abstractNote = {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}},
doi = {10.1103/PhysRevC.60.055503},
url = {https://www.osti.gov/biblio/688074}, journal = {Physical Review, C},
number = 5,
volume = 60,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1999},
month = {Mon Nov 01 00:00:00 EST 1999}
}