Geneva University
Ecole de physique - Département de physique nucléaire et corpusculaire
24, Quai Ernest-Ansermet
1211 GENEVE 4
Tél: (022) 379 62 73 - Fax: (022) 379 69 92
ATTENTION: exceptionally on Tuesday 23 September 2008
PARTICLE PHYSICS SEMINAR
at 17:00 – Stückelberg Auditorium
The Sudbury Neutrino Observatory: probing the Sun from 2 km underground by Dr. Gersende Prior, Lawrence Berkeley National Laboratory, USA The Sudbury Neutrino Observatory (SNO) experiment, located in a mine in Canada, started in 1999 and took solar-neutrino data for nearly seven years. The experiment operated in three distinct phases reflecting different experimental configurations. Results from its first two phases have provided revolutionary insights on the neutrino properties and have verified our understanding of the energy production in the sun. The analysis of data from the final phase of the experiment, during which an array of special counters was deployed to enhance the measurement of solar neutrino flux, has been completed.
After an introduction on neutrinos and the SNO detector, I will discuss briefly the results from the first two phases and present in details the results of the third and final phase of the SNO experiment.
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Organizer: J.-S. Graulich
SEMINAIRE DE PHYSIQUE CORPUSCULAIRE
at 11:00 – Stückelberg Auditorium
Electron interference in a mesoscopic system:
controlled dephasing and phase recovery via "post selection" measurements
Prof. Dr. M. Heiblum / Braun Center of Submicron Research, Weizmann Institute of Science, Rehovot, Israel
Electron interference in the solid enables determining electron coherence time; the phase of transmission or reflection coefficients of coherent devices; and the statistics of quasi-particles in interacting systems. To perform such measurements, electron interferometers were constructed. I will provide a few examples of such interferometers constructed in the two dimensional electron gas (2DEG) and show results of measurements of the phase electrons accumulate as they traverse quantum dots; will simulate the interaction of an interferometer with the environment by constructing a "which path" detector; and show how the interference can be recovered via experimentally "looking" only at a part of the data ("post selection" measurements)..
Organiser: Prof. Markus Büttiker