121684553
EFFECT OF DYNAMICAL DEFORMATION IN ELASTIC ELECTRON SCATTERING ON THE CHARGE DISTRIBUTIONS OF THE CALCIUM ISOTOPES.
The presence of dynamical deformations in the ground-state charge distributions of the calcium isotopes provides a basis for understanding two well-known but very different effects observed in elastic electron scattering from these isotopes.
119549050
ELECTRON SCATTERING FROM DEFORMED NUCLEI.
A general phenomenological theory is developed for the calculation of both elastic and inelastic transverse and longitudinal form factors for electron scattering from nuclei whose surfaces are deformed according to the expression $R+{(4\ensuremath{\pi})}^{\frac{1}{2}}{\ensuremath{\Sigma}}_{\mathrm{lm}}{\stackrel{^}{a}}_{\mathrm{lm}}{Y}_{\mathrm{lm}}(\stackrel{^}{\mathcal{r}})$. Here, the ${\stackrel{^}{a}}_{\mathrm{lm}}$ are operators in the nuclear Hilbert space, whose detailed dynamical character is left unspecified. The effects of deformation on the scattering, to any desired accuracy, are contained in reduced matrix elements of tensor products of the ${\stackrel{^}{a}}_{\mathrm{lm}}$. These are then treated as phenomenological parameters whose values are to be fixed from an analysis of the scattering cross sections, particularly at high momentum transfer. All the static and transition multipole moments of the nucleus are thereby determined, at least in principle. The Helm model and its generalization to transverse scattering are obtained in the small-deformation limit. The theory is used to analyze the Coulomb elastic and inelastic (to the 1.3-MeV ${\frac{3}{2}}^{+}$ level) scattering of electrons from $^{59}\mathrm{Co}$, as well as the magnetic elastic and inelastic scattering from $^{10}\mathrm{B}$. It is shown that the contribution of the deformation to elastic monopole scattering may be interpreted as due to an effective, oscillatory, spherically symmetric "modulating-charge" distribution, superimposed upon the more usual smeared uniform distribution. It is therefore suggested that the oscillations in the charge distribution which seem to be required in order to fit the high-energy elastic scattering from $^{40}\mathrm{Ca}$ and other nuclei may be due to deformations.
122327020
Dispersion corrections to elastic electron scattering by 16O and 12C
Abstract Longitudinal dispersion corrections to elastic electron scattering from 16 O and 12 C are calculated using oscillator wave functions and closure approximation. Near the first diffraction minimum, the contributions from the Pauli, COM and self-correlations almost cancel. The correction increases away from the minimum.
120797993
Comment on precise single-scattering optical-potential fit to 1 GeV p-$sup 4$He elastic scattering
45943105
Tuning into UHE Neutrinos in Antarctica - The ANITA Experiment
ice will produce a radio pulse by the means of the Askaryan effect. The large radio transparency of ice allows for such a pulse to be recorded by a cluster of balloon-borne antennas. The details of the ANITA instrument, now in a construction phase, and the science we hope to achieve is discussed. In order to prepare for the main mission, we have flown ANITA-lite during the 2003/04 austral season. ANITA-lite consisted of two quad-ridge horn antennas and a prototype RF (radio frequency) triggering and recording system. Here we present the results of an impulsive RF background survey of Antarctica, as well as proof-of-principle gain, tracking, and timing calibrations conducted by observing solar radio emissions and calibration radio-pulses. A preliminary UHE neutrino flux limit based on ANITA-lite data is also presented.
120506645
Results from the ANITA experiment (Analysis A)
The ANITA (ANtarctic Impulsive Transient Antenna) is a balloon-borne neutrino telescope which consists of an array of 32 broadband horn antennas. It successfully completed a 35 day flight over Antarctica during the 2006-2007 austral summer. The primary goal of ANITA is to search for astrophysical neutrinos with energies E > 1019 eV by detecting radio Cherenkov signals from neutrino-induced showers in the Antarctic ice. There are two independent data analysis groups in the ANITA experiment based on data blinding and analysis methods. We present results from one of the analysis groups with an event blinding approach.
108565123
SILICON PIXEL DETECTOR R&D FOR A BEAM PROFILE MONITOR
118586788
The Directional Dark Matter Detector ($D^{3}$)
Gas-filled Time Projection Chambers (TPCs) with Gas Electron Multipliers (GEMs) and pixels appear suitable for direction-sensitive WIMP dark matter searches. We present the background and motivation for our work on this technology, past and ongoing prototype work, and a development path towards an affordable, 1-m 3 -scale directional dark matter detector, D 3 . Such a detector may be particularly suitable for low-mass WIMP searches, and perhaps sufficiently sensitive to clearly determine whether the signals seen by DAMA, CoGeNT, and CRESST-II are due to low-mass WIMPs or background.