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Upgrading the Lithium Fluoride Target Holder for Quenching Factor Studies

Upgrading the Lithium Fluoride Target Holder for Quenching Factor Studies. Aaron Magner Grayson Rich Phil Barbeau. The 7 Li( p,n ) Reaction. Used for a monochromatic, tunable neutron source

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Upgrading the Lithium Fluoride Target Holder for Quenching Factor Studies

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  1. Upgrading the Lithium Fluoride Target Holder for Quenching Factor Studies Aaron Magner Grayson Rich Phil Barbeau

  2. The 7Li(p,n) Reaction • Used for a monochromatic, tunable neutron source • Neutrons used for calibration of new low-threshold detectors for neutrino and dark matter experiments (from Lee)

  3. Focus: Proton Beam and Target Health • Use the tandem accelerator at TUNL as energetic proton source • Determine proton flux at target; this is related to the rate of neutron production • Neutron production can be influenced by contamination of the target (pump oil, for example)

  4. The Target Holder • Determine composition of target (consider them as surface impurities on the Al backing) via proton back-scattering • Know scattering elements by kinematics

  5. The Target Holder • Determine composition of target (consider them as surface impurities on the Al backing) via proton back-scattering • Know scattering elements by kinematics; see Backscattering Spectrometry, Chu.

  6. The Runs: Pileup • Evident in runs with higher target current (hundreds of nanoamps) Reduce with baffles?

  7. The Runs: Pileup • Evident in runs with higher target current (hundreds of nanoamps) Reduce with baffles?

  8. The Spectra • Ratios of positions are appropriate for Li, F, and Al. • Other contaminants? Possibly Be, B, N, and O.

  9. N Be B O

  10. Future Work • Calibrate channels to energy • Add baffles to reduce protons scattering from wall before reaching detector • Cool the detector • Put LiF on thin C substrate, separated from Al, to reduce deep scatters Al LiF on C

  11. References • Chu, Wei-Kan. Backscattering Spectrometry. 1978. Academic Press, Inc: San Diego, California • Lee, Zhou, “Thick target neutron yields for the 7Li(p,n)Be reaction near threshold,” Nucl. Instr. and Meth. B 152, 1-11 (1999).

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