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Title: Measurement of Parity-Violating Gamma-ray Asymmetry in Compound Nuclei with Cold Neutrons

Abstract

The NPDGamma collaboration has constructed and commissioned an apparatus on flight path 12 at LANSCE to measure with a high precision, 5x10-9, the small parity-violating gamma-ray asymmetry, A{gamma}, in polarized neutron capture on protons. This asymmetry can be determined unambiguously the weak pion-nucleon coupling constant. To study the hadronic weak interaction at low energy, the collaboration has used the NPDGamma apparatus to measure parity-violating gamma-ray asymmetries in compound nuclei with cold neutrons. Using the statistical model of compound nuclei and spectroscopic information of the target nuclei, we can set upper limit on the spreading width of the hadronic weak interaction for intermediate-mass nuclei. We describe the experiment and the preliminary results of measured gamma-ray asymmetries of Al, Sc, Ti, Mn, and Co.

Authors:
 [1]; ; ; ; ;  [2];  [3]; ;  [4]; ; ; ; ;  [5]; ;  [6];  [7]; ; ;  [8]
  1. Department of Physics, North Carolina State University, Raleigh, NC 27695 (United States)
  2. Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
  3. Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 (United States)
  4. University of Michigan, Ann Arbor, MI 48104 (United States)
  5. Department of Physics, University of New Hampshire, Durham, NH 03824 (United States)
  6. Department of Physics University of California, Berkeley, CA 94720 (United States)
  7. National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)
  8. Department of Physics, University of Manitoba, Winnipeg, Manitoba R3T2N2 (Canada)
Publication Date:
OSTI Identifier:
20798381
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 819; Journal Issue: 1; Conference: 12. international symposium on capture gamma-ray spectroscopy and related topics, Notre Dame, IN (United States), 4-9 Sep 2005; Other Information: DOI: 10.1063/1.2187838; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALUMINIUM; ASYMMETRY; CAPTURE; COBALT; COLD NEUTRONS; COMPOUND NUCLEI; GAMMA RADIATION; GAMMA SPECTROSCOPY; NEUTRON REACTIONS; P INVARIANCE; PARITY; PION-NUCLEON INTERACTIONS; PROTONS; STATISTICAL MODELS; TITANIUM; WEAK INTERACTIONS

Citation Formats

Seo, P -N, Bowman, J D, Mitchell, G S, Penttilae, S I, Wilburn, W S, Yuan, V, Carlini, R D, Chupp, T E, Kandes, M, Covrig, S D, Dabaghyan, M, Hersman, F W, Mason, M, Zhu, H, Freedman, S J, Lauss, B, Gentile, T, Gericke, M T, Gillis, R C, and Page, S A. Measurement of Parity-Violating Gamma-ray Asymmetry in Compound Nuclei with Cold Neutrons. United States: N. p., 2006. Web. doi:10.1063/1.2187838.
Seo, P -N, Bowman, J D, Mitchell, G S, Penttilae, S I, Wilburn, W S, Yuan, V, Carlini, R D, Chupp, T E, Kandes, M, Covrig, S D, Dabaghyan, M, Hersman, F W, Mason, M, Zhu, H, Freedman, S J, Lauss, B, Gentile, T, Gericke, M T, Gillis, R C, & Page, S A. Measurement of Parity-Violating Gamma-ray Asymmetry in Compound Nuclei with Cold Neutrons. United States. https://doi.org/10.1063/1.2187838
Seo, P -N, Bowman, J D, Mitchell, G S, Penttilae, S I, Wilburn, W S, Yuan, V, Carlini, R D, Chupp, T E, Kandes, M, Covrig, S D, Dabaghyan, M, Hersman, F W, Mason, M, Zhu, H, Freedman, S J, Lauss, B, Gentile, T, Gericke, M T, Gillis, R C, and Page, S A. Mon . "Measurement of Parity-Violating Gamma-ray Asymmetry in Compound Nuclei with Cold Neutrons". United States. https://doi.org/10.1063/1.2187838.
@article{osti_20798381,
title = {Measurement of Parity-Violating Gamma-ray Asymmetry in Compound Nuclei with Cold Neutrons},
author = {Seo, P -N and Bowman, J D and Mitchell, G S and Penttilae, S I and Wilburn, W S and Yuan, V and Carlini, R D and Chupp, T E and Kandes, M and Covrig, S D and Dabaghyan, M and Hersman, F W and Mason, M and Zhu, H and Freedman, S J and Lauss, B and Gentile, T and Gericke, M T and Gillis, R C and Page, S A},
abstractNote = {The NPDGamma collaboration has constructed and commissioned an apparatus on flight path 12 at LANSCE to measure with a high precision, 5x10-9, the small parity-violating gamma-ray asymmetry, A{gamma}, in polarized neutron capture on protons. This asymmetry can be determined unambiguously the weak pion-nucleon coupling constant. To study the hadronic weak interaction at low energy, the collaboration has used the NPDGamma apparatus to measure parity-violating gamma-ray asymmetries in compound nuclei with cold neutrons. Using the statistical model of compound nuclei and spectroscopic information of the target nuclei, we can set upper limit on the spreading width of the hadronic weak interaction for intermediate-mass nuclei. We describe the experiment and the preliminary results of measured gamma-ray asymmetries of Al, Sc, Ti, Mn, and Co.},
doi = {10.1063/1.2187838},
url = {https://www.osti.gov/biblio/20798381}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 819,
place = {United States},
year = {2006},
month = {3}
}