Speaker
Hans Toshihide Tornqvist
(CERN)
Description
Spin-polarized nuclei are of great interest in many fields of physics, for example in nuclear structure, solid state and bio-physics. To reach this wide range of applications, an in-flight polarization technique based on the passage of ions through thin tilted foils has been investigated. This technique allows a beam of any non-zero spin nucleus to be polarized and post-accelerated. An experimental setup based on this technique has been installed at the REX-ISOLDE post-accelerator at CERN. To measure the degree of polarization, a $\beta$-NMR setup has been constructed after the polarizing foils. Recently we have concluded a successful commissioning run at REX-ISOLDE using a beam of $^8$Li that passed through tilted carbon foils and was implanted into a target crystal for observation of the angular distribution of
beta particles. RF was applied in order to observe the NMR spectrum, with the unambiguous signal of the destruction of $\beta$ asymmetry. Nuclear polarization in the percent region has been measured.
This contribution will present the experimental setup, including the tilted-foil and $\beta$-NMR systems. Next the $^8$Li experiment will be described, followed by results and their interpretation. The setup presented here constitutes a major improvement over past tilted-foil experiments at ISOLDE which used a high voltage platform and much lower energy ions. An outlook and future plans for the setup will be given.
Primary authors
Christophe Sotty
(CSNSM Centre de Spectrometrie Nucle aire et de Spectrometrie de)
Hans Toshihide Tornqvist
(CERN)
Co-authors
Dr
Andreas Heinz
(Chalmers, SE)
Prof.
Andrew Stuchbery
(ANU, Canberra)
Dr
Anukul Dhal
(Weizmann Institute, IL)
Ms
Asli Kusoglu
(CSNSM)
Dr
Deyan Yordanov
(Max-Planck-Gesellschaft (DE))
Dimiter Balabanski
(INRNE, Bulgarian Academy of Sciences)
Fredrik John Carl Wenander
(CERN)
Georgi Georgiev
(CSNSM Centre de Spectrometrie Nucle aire et de Spectrometrie de)
Mr
Håkan Johansson
(Chalmers)
Dr
Magdalena Kowalska
(CERN)
Michael Hass
(Weizmann Institute of Science (IL))
Miguel Luis Lozano Benito
(CERN)
Nobuaki Imai
(High Energy Accelerator Research Organization (JP))
Dr
Thomas Nilsson
(CTH Goteborg)
Dr
Yoshikazu Hirayama
(KEK, JP)
