The Low Energy Beam and Ion Trap (LEBIT) facility at NSCL has pioneered high-precision Penning trap mass measurements of in-flight separated projectile fragments. Rare-isotope beams with energies above 80 MeV/u have been stopped in a high-pressure gas cell,  thermalized and then transferred into a 9.4-Tesla Penning trap mass spectrometer. Masses of more than 30 rare isotopes have been determined with relative uncertainties of the order of 10 ppb, contributing to the study of nuclear structure and providing key data for nuclear astrophysics and for the test of fundamental interactions. New projects are underway at NSCL to maximize the scientific benefit of thermalized beams; a facility for laser spectroscopy, BECOLA, and a reaccelerator, ReA3, are under construction. NSCL's gas stopping system is presently being upgraded to serve these new activities best and to meet the requirements of the Facility for Rare Isotope Beams, FRIB, to be built at MSU.

Taming fast rare isotope beams: Precision mass measurements and more at NSCL at MSU

241st National Meeting (2011)

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