First Observation of P-odd gamma Asymmetry in Polarized Neutron Capture on Hydrogen

Authors

• D. Blyth, Arizona State University; Argonne National Laboratory
• J. Fry, University of Virginia; Indiana University
• N. Fomin, University of Tennessee; Los Alamos National Laboratory
• R. Alarcon, Arizona State University
• L. Alonzi, University of Virginia
• E. Askanazi, University of Virginia
• S. Baeßler, University of Virginia; Oak Ridge National Laboratory
• S. Balascuta, Horia Hulubei National Institute for Physics and Nuclear Engineering; Arizona State University
• L. Barrón-Palos, Universidad Nacional Autónoma de M´exico
• Alex Barzilov, University of Nevada, Las VegasFollow
• J. D. Bowman, Oak Ridge National Laboratory
• N. Birge, University of Tennessee
• J. R. Calarco, University of New Hampshire
• T. E. Chupp, University of Michigan
• V. Cianciolo, Oak Ridge National Laboratory
• C. E. Coppola, University of Tennessee
• C. B. Crawford, University of Kentucky
• K. Craycraft, University of Tennessee; University of Kentucky
• D. Evans, University of Virginia; Indiana University
• C. Fieseler, University of Kentucky
• E. Frlež, University of Virginia
• I. Garishvili, Oak Ridge National Laboratory; University of Tennessee
• M. T. W. Gericke, University of Manitoba
• R. C. Gillis, Oak Ridge National Laboratory; Indiana University
• K. B. Grammer, Oak Ridge National Laboratory; University of Tennessee
• G. L. Greene, Oak Ridge National Laboratory; University of Tennessee
• J. Hall, University of Virginia
• J. Hamblen, University of Tennessee
• C. Hayes, North Carolina State University; University of Tennessee
• E. B. Iverson, Oak Ridge National Laboratory
• M. L. Kabir, Mississippi State University; University of Kentucky

Document Type

Article

Publication Date

12-13-2018

Publication Title

Physical Review Letters

Publisher

American Physical Society

Volume

121

Issue

24

First page number:

1

Last page number:

7

Abstract

We report the first observation of the parity-violating gamma-ray asymmetry A(gamma)(np) in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A(gamma)(np) isolates the Delta I = 1, S-3(1)-> P-3(1) component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory… See full text for full abstract.

Disciplines

Mechanical Engineering | Physics

File Format

PDF

File Size

391 Kb

Language

English

Repository Citation

Blyth, D., Fry, J., Fomin, N., Alarcon, R., Alonzi, L., Askanazi, E., Baeßler, S., Balascuta, S., Barrón-Palos, L., Barzilov, A., Bowman, J. D., Birge, N., Calarco, J. R., Chupp, T. E., Cianciolo, V., Coppola, C. E., Crawford, C. B., Craycraft, K., Evans, D., Fieseler, C., Frlež, E., Garishvili, I., Gericke, M. T., Gillis, R. C., Grammer, K. B., Greene, G. L., Hall, J., Hamblen, J., Hayes, C., Iverson, E. B., Kabir, M. L. (2018). First Observation of P-odd gamma Asymmetry in Polarized Neutron Capture on Hydrogen. Physical Review Letters, 121(24), 1-7. American Physical Society.
http://dx.doi.org/10.1103/PhysRevLett.121.242002