28 research outputs found
Feasibility of the Spin-Light Polarimetry Technique for Longitudinally Polarized Electron Beams
A novel polarimeter based on the asymmetry in the spacial distribution of
synchrotron radiation will make for a fine addition to the existing M{\o}ller
and Compton polarimeters. The spin light polarimeter consists of a set of
wiggler magnet along the beam that generate synchrotron radiation. The spacial
distribution of synchrotron radiation will be measured by ionization chambers.
The up-down (below and above the wiggle) spacial asymmetry in the transverse
plain is used to quantify the polarization of the beam. As a part of the design
process, effects of a realistic wiggler magnetic field and an extended beam
size were studied. The perturbation introduced by these effects was found to be
negligible. Lastly, a full fledged GEANT-4 simulation was built to study the
response of the ionization chamber.Comment: International Nuclear Physics Conference 2013, 4 Pages, 7 Figure
Identifying ideal nuclei in which to search for CP violating moments: Necessity to populate nuclear levels and characterize their nuclear deformation
New sources of CP violation, beyond the known sources in the standard model (SM) via the CKM matrix, are required to explain the baryon asymmetry of the universe. Measurement of P,T violating moments, such as the electric dipole moment (EDM) or the magnetic quadrupole moment (MQM), of sub-atomic particles like the neutron or the electron as well as of atoms, serves as powerful tools with which to probe sources of CP violation. Quadrupole and octupole deformation of nuclei can significantly enhance the atomic EDM by many orders of magnitude compared to that with a spherical nucleus. In this white paper, we identify deformed isotopes in which to measure an EDM or an MQM. Furthermore, we also clearly identify a subset of these isotopes where measurements involving characterization of their level scheme and nuclear deformation parameters are necessary. (A section in the low energy white paper of the 2022 NSAC Long Range Planning exercise.)This work was sponsored by DOE grant #DE-SC0014448 and Ivy+ exchange program
A novel technique of extracting UCN lifetimes from storage bottle measurements dominated by scattering losses
Neutron lifetime is a critical parameter in the Standard Model. Its
measurements using, particularly, the beamline and ultracold neutron storage
techniques reveals serious tension. The status of the tension between various
measurements have been presented, in light of the insights provided by the
-decay correlation measurements. When ultracold neutrons are stored in
material bottles, they can be lost to various processes, such as -decay
and up-scattering on material walls. Here, we revisit the lifetime measurement
in a material storage bottle, dominated by losses from scattering off the walls
of the storage chamber. The neutron energy spectra and its associated
uncertainties were, for the first time, well characterized. Such models have
been used in the extraction of mean time between wall bounces, which is a key
parameter for neutron storage disappearance experiments in search of neutron
oscillation. A comparison between the loss model and the number of neutrons
stored in a single chamber, used for the neutron electric dipole moment search,
allowed us to extract a neutron lifetime of
. Though the uncertainty on this lifetime is not competent with
currently available measurements, the highlight of this work is that, we
precisely identify the systematic sources of uncertainty that contribute to the
neutron lifetime measurements in material storage bottles, namely from the
uncertainty in the energy spectra, as well as the storage chamber parameters of
Fermi potential and loss per bounce parameter. In doing so, we finally
highlight the underestimation of the uncertainties in the previous Monte Carlo
simulations of experiments using ultracold neutron storage in material bottles.Comment: 20 pages, 7 figures, 4 tables. Long unedited version, with extra
details. This is an independent analysis, and not a part of nEDM@PSI
collaboratio
Mississippi State Axion Search: A Light Shining though a Wall ALP Search
The elegant solutions to the strong CP problem predict the existence of a
particle called axion. Thus, the search for axion like particles (ALP) has been
an ongoing endeavor. The possibility that these axion like particles couple to
photons in presence of magnetic field gives rise to a technique of detecting
these particles known as light shining through a wall (LSW). Mississippi State
Axion Search (MASS) is an experiment employing the LSW technique in search for
axion like particles. The apparatus consists of two radio frequency (RF)
cavities, both under the influence of strong magnetic field and separated by a
lead wall. While one of the cavities houses a strong RF generator, the other
cavity houses the detector systems. The MASS apparatus looks for excesses in RF
photons that tunnel through the wall as a signature of candidate axion-like
particles. The concept behind the experiment as well as the projected
sensitivities are presented here.Comment: Xth Patras Workshop on Axions, WIMPs and WISPs; 4 Pages, 5 figure
Single-Electron Detection and Spectroscopy via Relativistic Cyclotron Radiation
It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting in a magnetic field has never been observed directly. We demonstrate single-electron detection in a novel radio-frequency spectrometer. The relativistic shift in the cyclotron frequency permits a precise electron energy measurement. Precise beta electron spectroscopy from gaseous radiation sources is a key technique in modern efforts to measure the neutrino mass via the tritium decay end point, and this work demonstrates a fundamentally new approach to precision beta spectroscopy for future neutrino mass experiments