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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

Upgrading the Lithium Fluoride Target Holder for Quenching Factor Studies

Aaron Magner

Grayson Rich

Phil Barbeau

the 7 li p n reaction
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)

focus proton beam and target health
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)
the target holder
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
the target holder1
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.
the runs pileup
The Runs: Pileup
  • Evident in runs with higher target current (hundreds of nanoamps) Reduce with baffles?
the runs pileup1
The Runs: Pileup
  • Evident in runs with higher target current (hundreds of nanoamps) Reduce with baffles?
the spectra
The Spectra
  • Ratios of positions are appropriate for Li, F, and Al.
  • Other contaminants? Possibly Be, B, N, and O.
slide9

N

Be

B

O

future work
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

references
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).