The LEBIT facility at MSU |
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Authors: | S Schwarz C Bachelet M Block G Bollen D Davies M Facina C M Folden III C Guénaut J Huikari E Kwan A A Kwiatkowski D J Morrissey G Pang A Prinke R Ringle J Savory P Schury C Sumithrarachchi T Sun |
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Institution: | (1) NSCL, Michigan State University, East Lansing, MI 48824-1321, USA;(2) Centre d’Etudes Nucléaires de Bordeaux, 33175 Gradignan, France |
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Abstract: | The low-energy beam and ion trap facility LEBIT at the NSCL at MSU has demonstrated that rare isotopes produced by fast-beam
fragmentation can be slowed down and prepared such that precision experiments with low-energy beams are possible. For this
purpose high-pressure gas-stopping is employed combined with advanced ion manipulation techniques. Penning trap mass measurements
on short-lived rare isotopes have been performed with a 9.4 T Penning trap mass spectrometer. Examples include 66As, which has a half-live of only 96 ms, and the super-allowed Fermi-emitter 38Ca, for which a mass accuracy of 8 ppb (280 eV) has been achieved. The high accuracy of this new mass value makes 38Ca a new candidate for the test of the conserved vector current hypothesis.
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Keywords: | Penning trap Beam manipulation Mass measurements |
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