Measurement of Neutron Decay Parameters-The abBA Experiment.
We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10(-4). The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized (3)He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = gA/gV . Uncertainty in λ dominates the uncertainty of CKM unitarity tests.
Los Alamos National Laboratory, Los Alamos, NM 87544.
W S
WS
Wilburn
Los Alamos National Laboratory, Los Alamos, NM 87544.
J D
JD
Bowman
Los Alamos National Laboratory, Los Alamos, NM 87544.
G S
GS
Mitchell
Los Alamos National Laboratory, Los Alamos, NM 87544.
J M
JM
O'Donnell
Los Alamos National Laboratory, Los Alamos, NM 87544.
S I
SI
Penttila
Los Alamos National Laboratory, Los Alamos, NM 87544.
P-N
PN
Seo
University of New Hampshire, Durham, NH 03824.
J R
JR
Calarco
University of New Hampshire, Durham, NH 03824.
F W
FW
Hersmann
University of Michigan, Ann Arbor, MI 48109.
T E
TE
Chupp
Oak Ridge National Laboratory, Oak Ridge, TN 37831.
T V
TV
Cianciolo
Oak Ridge National Laboratory, Oak Ridge, TN 37831.
K P
KP
Rykaczewski
Oak Ridge National Laboratory, Oak Ridge, TN 37831.
G R
GR
Young
Indiana University, Bloomington, IN 47408.
R T
RT
De Souza
Indiana University, Bloomington, IN 47408.
W M
WM
Snow
University of Tennessee, Knoxville, TN 37996.
D
D
Desai
University of Tennessee, Knoxville, TN 37996.
G L
GL
Greene
University of Tennessee, Knoxville, TN 37996.
R K
RK
Grzywacz
University of Virginia, Charlottesville, VA 22904.
E
E
Frlez
University of Virginia, Charlottesville, VA 22904.
D
D
Pocanic
National Institute of Standards and Technology, Gaithersburg, MD 20899.
T R
TR
Gentile
University of South Carolina, Columbia, SC 29208.
V
V
Gudkov
Hamilton College, Clinton, NY 13323.
G L
GL
Jones
neutron beta decay; weak interactions