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Precision Penning trap mass measurements of rare isotopes produced by projectile fragmentation |
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| Authors: | S Schwarz M Block G Bollen C M Campbell M Facina R Ferrer C M Folden III A A Kwiatkowski D J Morrissey G K Pang A M Prinke R J Ringle J Savory P H Schury |
| Institution: | 1. National Superconducting Cyclotron Laboratory, Michigan State University, 48824, East Lansing, MI, USA 2. GSI, Planckstrasse 1, 64291, Darmstadt, Germany 3. Department of Physics and Astronomy, Michigan State University, 48824, East Lansing, MI, USA 4. Department of Chemistry, Michigan State University, 48824, East Lansing, MI, USA 5. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada 6. Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan |
| Abstract: | The low-energy beam and ion trap facility LEBIT at NSCL/MSU is at present the only facility where precision experiments are performed with stopped rare isotope beams produced by fast-beam fragmentation. LEBIT combines high-pressure-gas stopping with advanced ion manipulation techniques to provide brilliant low-energy beams. So far these beams have mainly been used for mass measurements on short-lived rare isotopes with a 9.4T Penning trap mass spectrometer. Recent examples include 70m Br , located at the proton dripline, 32Si and the iron isotopes 63-65Fe . While the measurement of 32Si helps to solve a long-standing dispute over the validity of the isobaric multiplet mass equation (IMME) for the A = 32 , T = 2 multiplet, the mass measurements of 65m,g Fe marked the first time a nuclear isomeric state has been discovered by Penning trap mass spectrometry. |
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