"First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons" by Robert W. Pattie

Selected Works of Robert W. Pattie Jr.

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First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons

Physical Review Letters (2009)

Robert W. Pattie, North Carolina State University
J. Anaya, Los Alamos National Laboratory
Henning O. Back, North Carolina State University
J. G. Boissevain, Los Alamos National Laboratory
Thomas J. Bowles, Los Alamos National Laboratory
Leah J. Broussard, Triangle Universities Nuclear Laboratory
Richard Carr, W. K. Kellogg Radiation Laboratory
D. J. Clark, Los Alamos National Laboratory
Scott Currie, Los Alamos National Laboratory
S. Du, North Carolina State University
Bradley W. Filippone, W. K. Kellogg Radiation Laboratory
Peter Geltenbort, Institut Laue-Langevin
A. García, University of Washington
Ayman I. Hawari, North Carolina State University
Kevin P. Hickerson, W. K. Kellogg Radiation Laboratory
R. Hill, Los Alamos National Laboratory
M. Hino, Kyoto University
S. A. Hoedl, University of Washington
Gary E. Hogan, Los Alamos National Laboratory
Anthony T. Holley, Los Alamos National Laboratory
Takeyasu M. Ito, Los Alamos National Laboratory
T. Kawai, Kyoto University
K. Kirch, Los Alamos National Laboratory
S. Kitagaki, Tohoku University
Steve K. Lamoreaux, Los Alamos National Laboratory
ChenYu Liu, Princeton University
Jingyang Liu, W. K. Kellogg Radiation Laboratory
Mark Makela, Los Alamos National Laboratory
Russell R. Mammei, Virginia Tech
J. W. Martin, W. K. Kellogg Radiation Laboratory
Daniel Melconian, University of Washington
N. Meier, North Carolina State University
Michael P. Mendenhall, W. K. Kellogg Radiation Laboratory
Charles L. Morris, Los Alamos National Laboratory
R. Mortensen, Los Alamos National Laboratory
A. Pichlmaier, Los Alamos National Laboratory
Margaret L. Pitt, Virginia Tech
Blakely Plaster, W. K. Kellogg Radiation Laboratory
John C. Ramsey, Los Alamos National Laboratory
Roger Rios, Los Alamos National Laboratory
Konstantin Sabourov, North Carolina State University
A. L. Sallaska, University of Washington
Alexander Saunders, Los Alamos National Laboratory
R. Schmid, W. K. Kellogg Radiation Laboratory
Susan J. Seestrom, Los Alamos National Laboratory
C. Servicky, North Carolina State University
Sky K. L. Sjue, University of Washington
D. Smith, North Carolina State University
Walter E. Sondheim, Los Alamos National Laboratory
E. Tatar, Idaho State University
W. Teasdale, Los Alamos National Laboratory
Christopher R. Terai, North Carolina State University
B. Tipton, W. K. Kellogg Radiation Laboratory
M. Utsuro, Kyoto University
R. Bruce Vogelaar, Virginia Tech
Bernard Wehring, North Carolina State University
Y. P. Xu, North Carolina State University
Andrew R. Young, North Carolina State University
J. Yuan, W. K. Kellogg Radiation Laboratory

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Abstract

We report the first measurement of an angular correlation parameter in neutron decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for 30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2 2 solenoidal spectrometer. We determine a value for the -asymmetry parameter A0 ¼ 0:1138 0:0046 0:0021.

Keywords

First Measurement,
Neutron,
Asymmetry,
Ultracold Neutrons

Disciplines

Publication Date

January 5, 2009

DOI

10.1103/PhysRevLett.102.012301

Publisher Statement

©2009 American Physical Society. Authors have the nonexclusive right to post the APS-prepared version of the article to an institutional repository. This document was originally published in Physical Review Letters.

Citation Information

Robert W. Pattie, J. Anaya, Henning O. Back, J. G. Boissevain, et al.. "First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons" Physical Review Letters Vol. 102 Iss. 1 (2009) p. 12301 ISSN: 0031-9007
Available at: http://works.bepress.com/robert-pattie/32/