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 TennesseeFollow
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

329 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