Bret Crawford Physics Department Gettysburg college Gettysburg, PA 17325 Tel: 717-337-6054 Fax: 717-337-6027 E-mail: bcrawfor@gettysburg.edu

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I teach a variety of physics courses in the Physics Department at Gettysburg College.  I received my Ph.D. in 1997, in experimental nuclear physics from Duke University, where I worked at the Triangle Universities Nuclear Laboratory (TUNL).  My physics interests include parity violation in the compound nucleus, neutron scattering, and using low-energy proton accelerators in the undergraduate laboratory.  If you're interested, here's my CV in pdf. Courses Elementary Physics I (life-science majors) Elementary Physics II (life-science majors)) Intermediate Physics (EnM for PHY majors) Classical Mechanics (Jr/Sr PHY majors) Electricity and Magnetism (Jr/Sr PHY majors) Analog and Digital Electronics (Jr/Sr PHY majors) Introductory Quantum Mechanics (Jr PHY majors) Experiments in Quantum Physics (Jr/Sr PHY majors) Physics of Music (non-majors) Energy: Production, Use, and Environmental Impact (ES majors) Research Projects Measurement of the parity-violating spin rotation of transversely polarized cold neutrons traveling through liquid helium.  My students and I have been working on some computer simulations for the experiment at Los Alamos National Laboratory (LANSCE) and the National Institute of Standards and Technology (NCNR).  The NSR collaboration also uses this neutron polarimeter to place limits on possible exotic millimeter-range fifth forces. Measurement of the neutron lifetime using the beam method. The BL2 collaboration is currently repeating 2005 measurements with an improved apparatus. My students and I have been using simulations to study possible systematic effects. Measurement of the neutron-neutron scattering length at the YAGUAR reactor in Snezhinsk, Russia.  I worked on simulations of the neutron gas created within the central void of an annular, pulsed reactor. We also have a 250-keV Van de Graaff accelerator laboratory on campus.  The 1960s era accelerator was generously donated by TUNL. The proton accelerator is used in student projects. My Ph.D. graduate work involved measurements of parity non-conservation (PNC) asymmetries in resonant neutron cross sections for longitudinally polarized epithermal neutrons incident on Mass-100 and Mass-230 targets.  This work was done by the TRIPLE Collaboration at the Los Alamos National Laboratory.  While getting my masters at the University of Vermont, I investigated the transistor patent's of Julius E. Lilienfeld dating from the late 1920s and early 1930s.  Using 1930s laboratory techniques, we built transistor-like devices following Lilienfeld's 1933 patent (#1,900,018).  You can read all about it in my Masters thesis.

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