11 research outputs found
Parity violating electron scattering on the proton and deuteron at backward angles
The parity violating asymmetry in quasielastic electron scattering from the deuteron at backward scattering angles has been recently measured for the first time. Combined with the previously performed similar measurement on the proton, this measurement provides a determination of both the proton's strange magnetic form factor G^(a)_(M) and the axial vector e-N form factor G^(a)_(A). A preliminary analysis indicates that G^(a)_(M) is slightly positive but consistent with zero and that G^(e)_(A)(T=1) is in substantial disagreement with the theoretical estimate
Neutrino mass constraints on beta decay
Using the general connection between the upper limit on the neutrino mass and
the upper limits on certain types of non-Standard Model interaction that can
generate loop corrections to the neutrino mass, we derive constraints on some
non-Standard Model interactions. When cast into limits on
coupling constants, our results yield constraints on
scalar and tensor weak interactions improved by more than an order of magnitude
over the current experimental limits. When combined with the existing limits,
our results yield |C_S/C_V|\alt 5\times 10^{-3}, |C'_S/C_V|\alt 5\times
10^{-3}, |C_T/C_A| \alt 1.2\times 10^{-2} and |C'_T/C_A| \alt 1.2\times
10^{-2}.Comment: 4 pages, 3 figures; revised to reflect referee comments; accepted for
publication in Physical Review Letter
Optimization of the Ballistic Guide Design for the SNS FNPB 8.9 A Neutron Line
The optimization of the ballistic guide design for the SNS Fundamental
Neutron Physics Beamline 8.9 A line is described. With a careful tuning of the
shape of the curve for the tapered section and the width of the straight
section, this optimization resulted in more than 75% increase in the neutron
flux exiting the 33 m long guide over a straight m=3.5 guide with the same
length.Comment: 21 pages, 13 figures; added a paragraph on existing ballistic guides
to respond to referee comments; accepted for publication in Nuclear Inst. and
Methods in Physics Research,
Recent Results from the SAMPLE Experiment
The previous two SAMPLE experiments yielded a measurement of the axial e-N form
factor G^e_A substantially different from the theoretical estimate. In order to confirm this observation,
a third SAMPLE experiment was carried out at a lower beam energy of 125 MeV (Q^2 = 0.038 (GeV/c)^2) on a deuterium target. The data analysis is now at the final stage and the results
are consistent with the theoretical prediction of the axial form factor G^e_A. Also, revaluation of the
background dilution factor and the electromagnetic radiative correction for the 200 MeV deuterium
data lead to updated results, which are also consistent with the theoretical prediction
Cavallo's Multiplier for in situ Generation of High Voltage
A classic electrostatic induction machine, Cavallo's multiplier, is suggested
for in situ production of very high voltage in cryogenic environments. The
device is suitable for generating a large electrostatic field under conditions
of very small load current. Operation of the Cavallo multiplier is analyzed,
with quantitative description in terms of mutual capacitances between
electrodes in the system. A demonstration apparatus was constructed, and
measured voltages are compared to predictions based on measured capacitances in
the system. The simplicity of the Cavallo multiplier makes it amenable to
electrostatic analysis using finite element software, and electrode shapes can
be optimized to take advantage of a high dielectric strength medium such as
liquid helium. A design study is presented for a Cavallo multiplier in a
large-scale, cryogenic experiment to measure the neutron electric dipole
moment.Comment: 9 pages, 10 figure
Plans for a Neutron EDM Experiment at SNS
The electric dipole moment of the neutron, leptons, and atoms provide a
unique window to Physics Beyond the Standard Model. We are currently developing
a new neutron EDM experiment (the nEDM Experiment). This experiment, which will
be run at the 8.9 A Neutron Line at the Fundamental Neutron Physics Beamline
(FNPB) at the Spallation Neutron Source (SNS) at the Oak Ridge National
Laboratory, will search for the neutron EDM with a sensitivity two orders of
magnitude better than the present limit. In this paper, the motivation for the
experiment, the experimental method, and the present status of the experiment
are discussed.Comment: 9 Pages, 4 Figures, submitted to the proceedings of the Second
Meeting of the APS Topical Group on Hadronic Physics, Nashville, TN, October
22-24, 200
Electric dipole moments and the search for new physics
Static electric dipole moments of nondegenerate systems probe mass scales for
physics beyond the Standard Model well beyond those reached directly at high
energy colliders. Discrimination between different physics models, however,
requires complementary searches in atomic-molecular-and-optical, nuclear and
particle physics. In this report, we discuss the current status and prospects
in the near future for a compelling suite of such experiments, along with
developments needed in the encompassing theoretical framework.Comment: Contribution to Snowmass 2021; updated with community edits and
endorsement
The neutron and its role in cosmology and particle physics
Experiments with cold and ultracold neutrons have reached a level of
precision such that problems far beyond the scale of the present Standard Model
of particle physics become accessible to experimental investigation. Due to the
close links between particle physics and cosmology, these studies also permit a
deep look into the very first instances of our universe. First addressed in
this article, both in theory and experiment, is the problem of baryogenesis ...
The question how baryogenesis could have happened is open to experimental
tests, and it turns out that this problem can be curbed by the very stringent
limits on an electric dipole moment of the neutron, a quantity that also has
deep implications for particle physics. Then we discuss the recent spectacular
observation of neutron quantization in the earth's gravitational field and of
resonance transitions between such gravitational energy states. These
measurements, together with new evaluations of neutron scattering data, set new
constraints on deviations from Newton's gravitational law at the picometer
scale. Such deviations are predicted in modern theories with extra-dimensions
that propose unification of the Planck scale with the scale of the Standard
Model ... Another main topic is the weak-interaction parameters in various
fields of physics and astrophysics that must all be derived from measured
neutron decay data. Up to now, about 10 different neutron decay observables
have been measured, much more than needed in the electroweak Standard Model.
This allows various precise tests for new physics beyond the Standard Model,
competing with or surpassing similar tests at high-energy. The review ends with
a discussion of neutron and nuclear data required in the synthesis of the
elements during the "first three minutes" and later on in stellar
nucleosynthesis.Comment: 91 pages, 30 figures, accepted by Reviews of Modern Physic