J. Savory

The LEBIT facility at MSU. High-precision mass measurements at a fragmentation facility

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.

High precision Penning trap mass spectrometry of rare isotopes produced by projectile fragmentation

The Low Energy Beam and Ion Trap (LEBIT) is the only present facility to combine high precision Penning trap mass spectrometry with fast beam projectile fragmentation. Located at the National Superconducting Cyclotron Laboratory (NSCL), LEBIT is able to measure radionuclides produced in a chemically independent process with minimal decay losses. Recent exotic mass measurements include 66As, 63-66Fe, and 32Si. 66As is a new candidate to test the Conserved Vector Current (CVC) hypothesis. The masses of the neutron-rich iron isotopes provide additional information about the mass surface and the subshell closure at N = 40. 32Si is a member of the A = 32, T = 2 quintet; its measurement permits the most stringent test of the validity of the isobaric multiplet mass equation (IMME). An overview of some recent measurements will be presented as well as advanced techniques for ion manipulation.

Improved Mass Measurements of Nuclei Around N=Z=34

Joshua Savory ∗,a,b, C. Bachelet a, M. Block a, G. Bollen a,b, M. Facina a, C.M. Folden IIIa, C. Guénaut a, E. Kwan a,b, A.A. Kwiatkowski a, D.J. Morrissey a,c, G.K. Pang a,c, A. Prinke a,b, R. Ringle a,b, H. Schatz a,b, P. Schury a,b, S. Schwarz a, C.S. Sumithrarachchi a,c a National Superconducting Cyclotron Laboratory, East Lansing, MI 48824, USA b Department of Physics and Astronomy, East Lansing, MI 48824, USA c Department of Chemistry, East Lansing, MI 48824, USA

rp Process and Masses of N{approx_equal}Z{approx_equal}34 Nuclides

High-precision Penning-trap mass measurements of the

Experiments with Thermalized Rare Isotope Beams from Projectile Fragmentation: A Precision Mass Measurement of the Superallowed {beta} Emitter {sup 38}Ca

N\ensuremath{\approx}Z\ensuremath{\approx}34

Precision mass measurements of rare isotopes near N = Z = 33 produced by fast beam fragmentation

nuclides

Discovery of a Nuclear Isomer in 65Fe with Penning Trap Mass Spectrometry

^{68}\mathrm{Se}

High-precision Penning trap mass measurements of {sup 37,38}Ca and their contributions to conserved vector current and isobaric mass multiplet equation

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Precision mass measurements with LEBIT at MSU

^{70}\mathrm{Se}

Rp Process and Masses of N ≈ Z ≈ 34 Nuclides

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