M. Facina

Pulsed extraction of ionization from helium buffer gas

The migration of intense ionization created in helium buffer gas under the influence of applied electric fields is considered. First the chemical evolution of the ionization created by fast heavy-ion beams is described. Straight forward estimates of the lifetimes for charge exchange indicate a clear suppression of charge exchange during ion migration in low pressure helium. Then self-consistent calculations of the migration of the ions in the electric field of a gas-filled cell at the National Superconducting Cyclotron Laboratory (NSCL) using a particle-in-cell computer code are presented. The results of the calculations are compared to measurements of the extracted ion current caused by beam pulses injected into the NSCL gas cell.

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.

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

,

Rp Process and Masses of N ≈ Z ≈ 34 Nuclides

^{70}\mathrm{Se}

rpProcess and Masses ofN≈Z≈34Nuclides

,

Penning trap mass spectrometry of neutron-rich Fe and Co isotopes around N=40 with the LEBIT mass spectrometer

^{70m}\mathrm{Br}