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DESCRIPTION:Dave Phillips\, North Carolina State University\n\nPrecision me
asurements of neutron interactions at low energies and high intensities of
fer many avenues to search for physics beyond the Standard Model. Motivat
ed by this particle physics impact\, there are ongoing experimental progra
ms which utilize cold and ultra-cold neutrons (UCN) to measure the neutron
static electric dipole moment\, neutron β\;-decay parameters\, and po
ssible new short range interactions. In this talk\, we will focus on two s
uch programs: a β\;-decay program at Los Alamos National Laboratory (
LANL) utilizing UCNs and a proposed experiment to search for neutron-antin
eutron oscillations at Fermi National Accelerator Laboratory (FNAL). Moder
n studies of neutron β\;-decay offer an improved\, nuclear structure
independent determination of the CKM matrix element Vud throug
h more precise measurements of the neutron lifetime and β\;-decay cor
relation coefficients. Vud is a critical input to a direct test
of CKM matrix unitarity\, which places stringent limits on extensions to
the Standard Model for charged current interactions. This talk will begin
with a summary of the UCNA experiment at LANL\, the only experiment to per
form a measurement of angular correlations in neutron β\;-decay (spin
-electron asymmetry parameter A(E)) using UCN. We then present a recently
proposed experiment to search for n −\; ‾\;n oscillations using
free neutrons at FNAL\, which would provide a sensitive window to probe fo
r baryon number violating interactions with Δ\;β\; = 2\, would pro
vide insight into the origin of matter-antimatter asymmetry in the univers
e and would change our ideas on the energy scales relevant for quark-lepto
n unication and neutrino mass generation. Methods for an improved search
for n −\; ‾\;n oscillations using free neutrons and recent detec
tor characterization studies for such a search will be discussed.
DTSTART:20130924T193000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Precision Measurements with the Neutron at Low Energies and High In
tensities
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