HFI/NQI 2010

POLAREX : Study of polarized nuclei - first measurement

Not scheduled

500/1-001 - Main Auditorium (CERN)

POSTER Nuclear Moments, Nuclear Polarization, Nuclear Models, Fundamental Interactions

Speaker

Dr Carole Gaulard (CSNSM Centre de Spectrometrie Nucle aire et de Spectrometrie de)

Description

POLAREX (POLARization of EXotic nuclei) is a new experiment for the study of the nuclear magnetic moments and spins of exotic nuclei [1]. The On-Line Nuclear Orientation (OLNO) method will be used to observe the decay of a spin-oriented ensemble of nuclei. The OLNO method associates on-line implantation of a radioactive beam of interest with the “Low Temperature Nuclear Orientation” (LTNO) technique [2]. The low temperature orientation is obtained with an OXFORD 400 3He -4He dilution refrigerator which represents the main technical part of the system and that we inherited from TRIUMF. The exotic nuclei are implanted into a ferromagnetic host foil held at a temperature of order 10 mK attached to the cold finger of the refrigerator. The nuclear spins are oriented through the internal hyperfine field (10-100 T) and the ferromagnet fully magnetized by an external magnetic field (about 0.5 T). The aim of this experimental setup is to study neutron-rich nuclides produced at the ALTO facility (Linear Accelerator at Orsay Tandem) by fission induced by electrons from the linear electron accelerator (10-50 MeV, 10 microA) [3]. At the conference it will be presented the first "off-line" measurement achieved with this setup : anisotropy of Cobalt 60 on single crystal of cobalt. The aim of a such measurement was to calibrate the apparatus. Then it will be also discussed the planning of the next studies and the evolution of this infrastructure. [1] http://csnwww.in2p3.fr/polarex/ [2] Low Temperature Nuclear Orientation, eds. N.J. Stone and H. Postma (North-Holland, Amsterdam) 1986 [3] http://ipnweb.in2p3.fr/tandem-alto/alto/