Heidelberg 1999 – scientific programme
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MS: Massenspektrometrie
MS I: HV I
MS I.1: Invited Talk
Monday, March 15, 1999, 10:00–10:30, PA 3
MISTRAL: A radiofrequency spectrometer for mass measurements of very short-lived nuclides — •D. Lunney1, G. Audi1, C. Borcea2, H. Doubre1, M. Duma2, M. Jacotin1, J.-F. Képinski1, G. Lebée3, G. Le Scornet1, C. Monsanglant1, M. de Saint Simon1, C. Thibault1, C. Toader1, and The ISOLDE Collaboration3 — 1CSNSM-CNRS, Université Paris Sud, F-91405 Orsay — 2IAP, Bucharest, Romania — 3CERN, CH-1211 Geneva
The MISTRAL (Mass measurements at ISOLDE using a Transmission and Radiofrequency spectrometer on-Line) collaboration has now performed two experiments at the ISOLDE mass separator facility at CERN and measured the masses of some 13 radioactive isotopes. The physics motivating such measurements comes from nuclear structure and stellar nucleosynthesis. Using a direct technique of coherent radiofrequency modulations of the kinetic energy of an ion beam in a magnetic field at a high harmonic of the ion cyclotron frequency, precise mass measurements are made of radioisotopes, especially having very short half-lives. The most short-lived so far is +28Na for which the half-life is 31 ms and for which the mass has been determined, with respect to two calibrations (+23Na and +39K), to about 14 keV. MISTRAL complements other experiments measuring masses, notably using Penning traps but also storage rings, since it can access isotopes whose half-lives are only limited by diffusion out of target material. The residency of MISTRAL at ISOLDE is expected to span several years.