First results from the CRIS experiment
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First results from the CRIS experiment K. T. Flanagan · J. Billowes · M. L. Bissell · I. Budinˇcevi´c · T. E. Cocolios · R. P. de Groote · S. De Schepper · V. N. Fedosseev · S. Franchoo · R. F. Garcia Ruiz · H. Heylen · K. M. Lynch · B. A. Marsh · G. Neyens · T. J. Procter · R. E. Rossel · S. Rothe · I. Strashnov · H. H. Stroke · K. D. A. Wendt
© Springer Science+Business Media Dordrecht 2013
Abstract The ability to study rare isotopes with techniques such as mass spectrometry and laser spectroscopy is often prevented by low production rates and large isobaric contamination. This has necessitated the development of novel beam cleaning techniques that can efficiently isolate the isotope of interest. The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, achieves this by resonantly ionizing a bunched atom beam in a region of ultra high vacuum. This method is motivated by the need to measure the hyperfine structure and isotope shift at the extremes of isospin where typical production rates drop to 1 atom/s. The technique also offers the ability to purify an ion beam and even select long-lived isomeric states (>1 ms) from the ground state, which can be subsequently studied by decay spectroscopy or mass spectrometry experiments. This paper will report on the successful commissioning of the CRIS beam line and the recent laser spectroscopy results and laser assisted nuclear decay spectroscopy on the neutron deficient francium isotopes. Proceedings of the 9th International Workshop on Application of Lasers and Storage Devices in Atomic Nuclei Research “Recent Achievements and Future Prospects” (LASER 2013) held in Poznan, Poland, 13–16 May, 2013. K. T. Flanagan () · J. Billowes · T. E. Cocolios · K. M. Lynch · T. J. Procter · I. Strashnov School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK e-mail: [email protected] M. L. Bissell · I. Budinˇcevi´c · R. P. de Groote · S. De Schepper · R. F. Garcia Ruiz · H. Heylen · G. Neyens Instituut voor Kern- en Stralingsfysica, KU Leuven, 3001 Leuven, Belgium V. N. Fedosseev · B. A. Marsh · R. E. Rossel · S. Rothe Engineering Department, CERN, 1211 Geneva 23, Switzerland S. Franchoo Institut de Physique Nucl´eaire d’Orsay, 91406 Orsay, France H. H. Stroke Department of Physics, New York University, New York, NY 10003, USA K. D. A. Wendt Institut f¨ur Physik, Johannes Gutenberg-Universit¨at Mainz, 55128 Mainz, Germany
K. T. Flanagan et al.
Keywords Laser spectroscopy · Nuclear structure
1 Introduction Optical studies of radioactive nuclei provide a wealth of model-independent nuclear observables: changes in mean-square charge radii, nuclear moments and spin. These observables provide critically important information on the composition of the nuclear wave function, the distribution of charge and shape of the nucleus. It should also be noted that the simple measurement of additional resonances within the hyperfine structure can unambiguously demonstrate the existence of long-lived isomeric states [1]. If the s
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