768 research outputs found
A relativistic model for neutrino pion production from nuclei in the resonance region
We present a relativistic model for electroweak pion production from nuclei,
focusing on the and the second resonance region. Bound states are
derived in the Hartree approximation to the Walecka model.
Final-state interactions of the outgoing pion and nucleon are described in a
factorized way by means of a relativistic extension of the Glauber model. Our
formalism allows a detailed study of neutrino pion production through ,
, energy, angle and out-of-plane distributions.Comment: 3 pages, 1 figure, poster presented at the NuInt07 conference on
few-GeV neutrino physic
Quasiparticle Andreev scattering in the fractional quantum Hall regime
The scattering of exotic quasiparticles may follow different rules than
electrons. In the fractional quantum Hall regime, a quantum point contact (QPC)
provides a source of quasiparticles with field effect selectable charges and
statistics, which can be scattered on an 'analyzer' QPC to investigate these
rules. Remarkably, for incident quasiparticles dissimilar to those naturally
transmitted across the analyzer, electrical conduction conserves neither the
nature nor the number of the quasiparticles. In contrast with standard elastic
scattering, theory predicts the emergence of a mechanism akin to the Andreev
reflection at a normal-superconductor interface. Here, we observe the predicted
Andreev-like reflection of an quasiparticle into a hole
accompanied by the transmission of an quasielectron. Combining shot noise
and cross-correlation measurements, we independently determine the charge of
the different particles and ascertain the coincidence of quasielectron and
fractional hole. The present work advances our understanding on the
unconventional behavior of fractional quasiparticles, with implications toward
the generation of novel quasi-particles/holes and non-local entanglements
WARP: a WIMP double phase Argon detector
The WARP programme for dark matter search with a double phase argon detector
is presented. In such a detector both excitation and ionization produced by an
impinging particle are evaluated by the contemporary measurement of primary
scintillation and secondary (proportional) light signal, this latter being
produced by extracting and accelerating ionization electrons in the gas phase.
The proposed technique, verified on a 2.3 liters prototype, could be used to
efficiently discriminate nuclear recoils, induced by WIMP's interactions, and
measure their energy spectrum. An overview of the 2.3 liters results and of the
proposed 100 liters detector is shown.Comment: Proceeding for IDM200
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