Analysis of 13Be Created by a Charge Exchange Reaction
Dr. Paul DeYoung
The traditional way of creating neutron-unbound nuclei involves the removal of one or more nucleons from a fast beam. This method often results in a background that makes it difficult to identify the particle of interest. This process also requires starting with beams that are heavier than the particle of interest, which are unstable, difficult to make, and have low-intensities. To avoid these obstacles, experiments can be done with a more unorthodox entrance channel as was done in the present work. Here, 13Be was produced via a charge exchange reaction. A beam of 13B ions at 75MeV/u was produced by the cyclotrons and A1900 fragment separator at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. When this 13B beam hit the 47 mg/cm2 9Be target many reactions occurred including a charge exchange reaction that made 13Be. The 13Be decayed to 12Be + n in approximately 10-20s. The neutrons were detected by either the Modular Neutron Array (MoNA) or Large multi-Institution Scintillator Array (LISA), and the 12Be fragment nuclei’s paths were directed by a 4T superconducting sweeper magnet through an array of charged particle detectors. The two four-momentum vectors (for the fragment nucleus and the neutron) are calculated to determine the decay energy of 13Be which will be compared with previous results. The cross-section for the charge exchange process will be calculated from the number of 13Be events.
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