CRIS: A new method in isomeric beam production
1 School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
2 ISOLDE, PH Department, CERN, CH-1211 Geneva-23, Switzerland
3 Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
4 EN Department, CERN, CH-1211 Geneva 23, Switzerland
5 Institut de Physique Nucléaire d’Orsay, F-91406 Orsay, France
6 Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
7 Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
8 LPSC, F-38026 Grenoble, France
9 Department of Physics, New York University, NY, New York 10003, USA
a e-mail: email@example.com
Published online: 19 December 2013
The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, CERN, uses laser radiation to stepwise excite and ionize an atomic beam for the purpose of ultra-sensitive detection of rare isotopes, and hyperfine-structure measurements. The technique also offers the ability to purify an ion beam that is heavily contaminated with radioactive isobars, including the ground state of an isotope from its isomer, allowing decay spectroscopy on nuclear isomeric states to be performed. The isomeric ion beam is selected by resonantly exciting one of its hyperfine structure levels, and subsequently ionizing it. This selectively ionized beam is deflected to a decay spectroscopy station (DSS). This consists of a rotating wheel implantation system for alpha- and beta-decay spectroscopy, and up to three germanium detectors around the implantation site for gamma-ray detection. Resonance ionization spectroscopy and the new technique of laser assisted nuclear decay spectroscopy have recently been performed at the CRIS beam line on the neutron-deficient francium isotopes. Here an overview of the two techniques will be presented, alongside a description of the CRIS beam line and DSS.
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