A new beamline for laser spin-polarization at ISOLDE

0504419 - ÚJF 2020 RIV NL eng J - Journal Article
Gins, W. - Harding, R. D. - Baranowski, M. - Bissell, M. L. - Ruiz, R. F. G. - Kowalska, M. - Neyens, G. - Pallada, S. - Severijns, N. - Velten, P. - Wienholtz, F. - Xu, Z. Y. - Yang, X. F. - Zákoucký, Dalibor
A new beamline for laser spin-polarization at ISOLDE.
Nuclear Instruments & Methods in Physics Research Section A. Roč. 925, č. 5 (2019), s. 24-32. ISSN 0168-9002. E-ISSN 1872-9576
R&D Projects: GA MŠMT LM2015058
Institutional support: RVO:61389005
Keywords : beamline * laser polarization * beta-asymmetry * Adiabatic rotation
OECD category: Particles and field physics
Impact factor: 1.265, year: 2019
Method of publishing: Open access
https://doi.org/10.1016/j.nima.2019.01.082

A beamline dedicated to the production of laser-polarized radioactive beams has been constructed at ISOLDE, CERN. We present here different simulations leading to the design and construction of it, as well as technical details of the full setup and examples of the achieved polarizations for several radioisotopes. Beamline simulations show a good transmission through the entire line, in agreement with observations. Simulations of the induced nuclear spin-polarization as a function of atom-laser interaction length are presented for Na-26,Na-28, and for Ar-35, which is studied in this work. Adiabatic spin rotation calculations of the spin-polarized ensemble of atoms, and how this influences the observed nuclear ensemble polarization, are also performed for the same nuclei. For Ar-35, we show that multiple-frequency pumping enhances the ensemble polarization by a factor 1.85, in agreement with predictions from a rate equations model.
Permanent Link: http://hdl.handle.net/11104/0296058