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Commissioning of the Super Separator Spectrometer (S3) at SPIRAL2

Experimental nuclear physics and instrumentation

The Super Separator Spectrometer S3 is a major experimental system developed for SPIRAL2 at GANIL, a facility that is on the ESFRI list (European Strategy Forum on Research Infrastructures). It has been designed for physics experiments with very low cross sections by taking full advantage of the very high intensity stable beams to be produced by LINAG, the superconducting linear accelerator of the GANIL/SPIRAL2 facility. The expected heavy ion beam intensities will open new opportunities in several physics domains using fusion evaporation reactions, principally: super-heavy and very-heavy element properties, spectroscopy at and beyond the dripline, and isomer and ground state properties. The common feature of these experiments is the requirement to separate very rare events from intense backgrounds. S3 accomplishes this with a large acceptance, a high background rejection efficiency, and a physical mass separation.

S3 is a two-step low energy fragment separator. The first step is a momentum achromat for rough rejection of the primary beam and the second step is a mass spectrometer. The focal plane can be equipped with different detection setups. Notably, the SIRIUS spectroscopy station is designed to study proton, alpha, electron and gamma decays of the nuclei of interest. Conversely, the REGLIS3 low-energy branch can be installed to stop the reaction products in a gas cell for in-gas-jet laser ionization and spectroscopy and, if required, transmission to other detection systems.

We are looking for enthusiastic candidates who will work with a team of scientists on the commissioning and science exploitation of this new instrument. In general, the PhD student will perform experimental work and the corresponding data analysis of the first experiments with this new device.

This work is performed in a large international collaboration with GANIL, IPHC-Strasboug, IPNO-Orsay, Irfu-Saclay (France), ANL (USA) and KU Leuven (Belgium).

Expected skills: Good knowledge in nuclear physics, ion optics, instrumentation, and computing are desirable. Proficiency in English


Contact:  Hervé Savajols

GANIL, BP 5027, 14 076 Caen cedex 05


Phone: +33 (0)2 31 45 46 99

 Fax: +33 (0)2 31 45 44 21 

e-mail: savajols_at_ganil.fr



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