The coherent elastic neutral current neutrino-nucleus scattering [D. Z. Freedman, D. N. Schramm, and D. L. Tubbs, Ann. Rev. Nucl. Part. Sci. 27, 167 (1977)] has never been observed. In this process, a neutrino of any flavor scatters off a nucleus at low momentum transfer Q such that the nucleon wave function amplitudes are in phase and add coherently. K. Scholberg and collaborators including D. Markoff, have proposed a new measurement of this cross section using the Spallation Neutron Source at Oak Ridge as a source of pulsed neutrinos [K. Scholberg, Phys. Rev. D73, 033005 (2006), hepex/0511042]. The specific detector we plan to build is called CLEAR (Coherent Low Energy A (Nuclear) Recoils. We have selected a single-phase design which allows interchangeable noble liquid target materials. Multiple targets are desirable to test for physics beyond the Standard Model.
The NCCU experimental team will be responsible for the outer region, veto detector. In addition, associated with the CREST center, NCCU faculty and students are involved in the development of simulation codes to model the experiment. We are currently focusing on building the geometry model of the detector and in studying systematics. The collaboration has chosen to use RAT, a Monte Carlo and analysis tool developed by the Braidwood collaboration [http://braidwood.uchicago.edu/] for modeling the behavior of a liquid scintillator detector surrounded by photomultiplier tubes. The analysis tool is based on the GEANT4 code package for the simulation of particle interactions [Ago03]. This summer, NCCU undergraduate student James Walker helped to install and implement the RAT program on the CLEAR computers at Duke University, developed the initial veto region geometry, and ran preliminary simulations to study systematics associated with background events. His work was used to compare to previous GEANT based calculations with the intention of establishing confidence in the RAT code.