Population of 13Be in Nucleon Exchange Reactions
Dr. Paul DeYoung
The traditional way of creating neutron-unbound nuclei involves the removal of one or more nucleons from a fast beam of ions. This method often results in a background that makes it difficult to identify the particle of interest; it also requires starting with beams that are heavier than the particle of interest. These beams are unstable, difficult to make, and have low intensities. In an effort to avoid these obstacles, the present work was done with a more unorthodox entrance channel called a nucleon exchange reaction. A beam of 13B ions was produced at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU), when this 13B beam hit the 47 mg/cm2 9Be target many reactions occurred, including a nucleon exchange reaction that produced 13Be. The 13Be nuclei decayed in approximately 10���seconds to 12Be + n. 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 four-momentum vectors (for the fragment nucleus and the neutron) were calculated to determine the decay energy of 13Be, which is being compared with previous results. The cross-section for the nucleon exchange process is being determined.
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