Speaker
Mr
Christope Sotty
(CSNSM)
Description
Project participants: Dimiter Balabanski (University of Sofia, Bulgaria), Georgi Georgiev (CSNSM, France), Michael Hass (Weizmann Institute of Science, Israel), Lars Hemmingsen (University of Copenhagen, Denmark), Alexander Herlert (ISOLDE, Switzerland), Karl Johnston (ISOLDE, Switzerland), Thomas Nilsson (Chalmers University of Technology, Sweden), Janne Pakarinen (ISOLDE, Switzerland), Monika Stachura (University of Copenhagen, Denmark), Fredrik Wenander (ISOLDE, Switzerland), Wolf-Dietrich Zeitz (HMI, Germany).
The beta-NMR is a highly sensitive technique used for studies of nuclei as well as properties of condensed matter (Solid-State Physics, Biophysics etc). The first requirement for performing a beta-NMR measurement is to obtain an ensemble of polarized nuclei. There are several techniques that can be used for this purpose. However, one of the least demanding ones, provided a reliable control of its application is gained, is the tilted foils (TF) technique. The TF method is based on the transfer of the atomic polarization, obtained by the passage of the ions through foils at oblique angles, to the nuclear spins.
An experimental setup utilizing the beta-NMR technique is currently being assembled after the REX-ISOLDE accelerator. The setup has been previously used at HMI, Berlin. A stack of tilted foils will be used for the spin polarization, with beam energies from REX varying between 0.3 and 3 MeV/u (with HIE-ISOLDE up to 10 MeV/u). The initial experimental runs will investigate the polarization of the beta-decaying isotopes 8Li and 27Na, used in earlier polarization experiments. The tilted foils will be introduced in the immediate vicinity of the beta-NMR apparatus and the beam will be implanted into a suitable host for observation of the beta decay asymmetry. An external RF-field, applied in direction perpendicular to the holding magnetic field B, will be used to destroy the nuclear polarization at the NMR position, thus giving a measure of the degree of the initial spin polarization.
As a first stage of the program we are planning to gain broad knowledge on the process of TF polarization in different energy regimes. This should allow for better control and production of a larger variety of polarized nuclear species both at low energies and, eventually, post accelerated polarized beams. The present status of the setup and the perspectives of the program will be presented.
| Is this an invited talk? (please answer yes or no) | no |
|---|---|
| Would you prefer your contribution to be an oral presentation? (please answer yes or no) | no |
| Would you prefer your contribution to be a poster presentation? (please answer yes or no) | yes |
Author
Mr
Christope Sotty
(CSNSM)
Co-author
Mr
Hans Toshihide Tornqvist
(CERN)
