Hope College Physics Department
Research Experiences for Undergraduates
|Project Title:||Analysis of 13Be Created by a Charge Exchange Reaction|
|Student Name:||Braden Marks|
|Student's Home Institution:||Hope College|
|Research Advisor:||Dr. Paul DeYoung and Dr. Graham Peaslee|
|Source of Support:||
This material is based upon work supported by the National Science Foundation under grant No. PHY-0969058.
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
(NSCL) at Michigan State Univ (MSU). 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 results1, 2. The cross-section for the charge
exchange process will be calculated from the number of 13Be events.
 Y. Kondo et al./ Physics Letters B 690 (2010) 245.
 Yu. Asyutina et al./ Physical Reveiw C 87, 064316 (2013).
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