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Title: A measurement of the parity-violating gamma-ray asymmetry in the neutron-proton capture

Abstract

The {rvec n} + p {yields} d + {gamma} experiment under construction at LANSCE studies the weak interaction between neutrons and protons. The experiments will measure the directional dependence of the parity-violating {gamma}-ray asymmetry, A{sub {gamma}}, in the polarized cold neutron capture by para-hydrogen. The goal is to measure A{sub {gamma}} with uncertainty of 0.5 x 10{sup -8}, 10% of its predicted value. A{sub {gamma}} primarily isolates the {Delta}I = 1 component of the hadronic weak interaction and thus will determine the long-range weak pion-nucleon coupling constant H{sub {pi}}{sup 1}. The experiment is carefully designed for the LANSCE pulsed spallation neutron source to achieve the proposed statistical precision and to control systematic errors. We discuss the experiment and its status.

Authors:
 [1];  [2];  [3]; ; ; ; ; ;  [4]; ; ; ; ; ; ;  [5]; ; ; ; more »;  [6];  [7];  [8]; ;  [9] « less
  1. Seppo I.
  2. J. David
  3. Roger D.
  4. Michael T.
  5. Gregory S.
  6. Ėduard Ivanovich
  7. Todd B.
  8. William M.
  9. Vincent W.
Publication Date:
Research Org.:
Los Alamos National Laboratory
Sponsoring Org.:
USDOE
OSTI Identifier:
976399
Report Number(s):
LA-UR-02-6560
TRN: US1006896
Resource Type:
Conference
Resource Relation:
Conference: Submitted to: Proceedings of the 11th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Pruhonice, Prague, Czech Republic, September 2-6, 2002
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; ASYMMETRY; COLD NEUTRONS; CONSTRUCTION; COUPLING CONSTANTS; NEUTRON SOURCES; NEUTRONS; PROTONS; SPALLATION; SPECTROSCOPY; WEAK INTERACTIONS

Citation Formats

Penttila, S I, Bowman, J D, Carlini, R D, Case, T, Chupp, T E, Coulter, K P, Freedman, S J, Gentile, T R, Gericke, M T, Greene, G L, Hersmann, B, Ishimoto, S, Jones, G L, Leuschner, M B, Masuda, Y, Mitchell, G S, Morimoto, K, Nann, H, Page, S A, Ramsay, W D, Sharapov, Ė I, Smith, T B, Snow, W M, Wilburn, S W, and Yuan, V W. A measurement of the parity-violating gamma-ray asymmetry in the neutron-proton capture. United States: N. p., 2002. Web.
Penttila, S I, Bowman, J D, Carlini, R D, Case, T, Chupp, T E, Coulter, K P, Freedman, S J, Gentile, T R, Gericke, M T, Greene, G L, Hersmann, B, Ishimoto, S, Jones, G L, Leuschner, M B, Masuda, Y, Mitchell, G S, Morimoto, K, Nann, H, Page, S A, Ramsay, W D, Sharapov, Ė I, Smith, T B, Snow, W M, Wilburn, S W, & Yuan, V W. A measurement of the parity-violating gamma-ray asymmetry in the neutron-proton capture. United States.
Penttila, S I, Bowman, J D, Carlini, R D, Case, T, Chupp, T E, Coulter, K P, Freedman, S J, Gentile, T R, Gericke, M T, Greene, G L, Hersmann, B, Ishimoto, S, Jones, G L, Leuschner, M B, Masuda, Y, Mitchell, G S, Morimoto, K, Nann, H, Page, S A, Ramsay, W D, Sharapov, Ė I, Smith, T B, Snow, W M, Wilburn, S W, and Yuan, V W. Tue . "A measurement of the parity-violating gamma-ray asymmetry in the neutron-proton capture". United States. https://www.osti.gov/servlets/purl/976399.
@article{osti_976399,
title = {A measurement of the parity-violating gamma-ray asymmetry in the neutron-proton capture},
author = {Penttila, S I and Bowman, J D and Carlini, R D and Case, T and Chupp, T E and Coulter, K P and Freedman, S J and Gentile, T R and Gericke, M T and Greene, G L and Hersmann, B and Ishimoto, S and Jones, G L and Leuschner, M B and Masuda, Y and Mitchell, G S and Morimoto, K and Nann, H and Page, S A and Ramsay, W D and Sharapov, Ė I and Smith, T B and Snow, W M and Wilburn, S W and Yuan, V W},
abstractNote = {The {rvec n} + p {yields} d + {gamma} experiment under construction at LANSCE studies the weak interaction between neutrons and protons. The experiments will measure the directional dependence of the parity-violating {gamma}-ray asymmetry, A{sub {gamma}}, in the polarized cold neutron capture by para-hydrogen. The goal is to measure A{sub {gamma}} with uncertainty of 0.5 x 10{sup -8}, 10% of its predicted value. A{sub {gamma}} primarily isolates the {Delta}I = 1 component of the hadronic weak interaction and thus will determine the long-range weak pion-nucleon coupling constant H{sub {pi}}{sup 1}. The experiment is carefully designed for the LANSCE pulsed spallation neutron source to achieve the proposed statistical precision and to control systematic errors. We discuss the experiment and its status.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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