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Neutron spectroscopy with N₂-filled high-pressure large-volume spherical proportional counters

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arxiv 2107.02682 v1 pith:3SCRJILQ submitted 2021-07-06 physics.ins-det hep-ex

Neutron spectroscopy with N$_2$-filled high-pressure large-volume spherical proportional counters

classification physics.ins-det hep-ex
keywords neutronproportionalsphericalcountersdarkfastmattermeasurements
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

Precise in-situ measurements of the neutron flux in underground laboratories is crucial for direct dark matter searches, as neutron induced backgrounds can mimic the typical dark matter signal. The development of a novel neutron spectroscopy technique using Spherical Proportional Counters is investigated. The detector is operated with nitrogen and is sensitive to both fast and thermal neutrons through the $^{14}$N(n, $\alpha$)$^{11}$B and $^{14}$N(n, p)$^{14}$C reactions. This method holds potential to be a safe, inexpensive, effective, and reliable alternative to $^3$He-based detectors. Measurements of fast and thermal neutrons from an Am-Be source with a Spherical Proportional Counter operated at pressures up to 2 bar at Birmingham are discussed.

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