Upgrading the lithium fluoride target holder for quenching factor studies
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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

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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.


Upgrading the lithium fluoride target holder for quenching factor studies

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).


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