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Your search keyword '"Chaplinsky, L."' showing total 3 results
Start Over Author "Chaplinsky, L." Publisher escholarship, university of california
3 results on '"Chaplinsky, L."'

1. A portable and monoenergetic 24 keV neutron source based on 124Sb-9Be photoneutrons and an iron filter

Author

Biekert, A, Chang, C, Chaplinsky, L, Fink, CW, Frey, WD, Garcia-Sciveres, M, Guo, W, Hertel, SA, Li, X, Lin, J, Lisovenko, M, Mahapatra, R, McKinsey, DN, Mehrotra, S, Mirabolfathi, N, Patel, PK, Penning, B, Pinckney, HD, Reed, M, Romani, RK, Sadoulet, B, Smith, RJ, Sorensen, P, Suerfu, B, Suzuki, A, Velan, V, Wang, G, Wang, Y, Watkins, SL, Williams, MR, and collaboration, The SPICE HeRALD

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Affordable and Clean Energy, Dark Matter detectors, Detector alignment and calibration methods, Engineering, Nuclear & Particles Physics, Physical sciences
Abstract

A portable monoenergetic 24 keV neutron source based on the 124Sb-9Be photoneutron reaction and an iron filter has been constructed and characterized. The coincidence of the neutron energy from SbBe and the low interaction cross-section with iron (mean free path up to 29 cm) makes pure iron specially suited to shield against gamma rays from 124Sb decays while letting through the neutrons. To increase the 124Sb activity and thus the neutron flux, a >1 GBq 124Sb source was produced by irradiating a natural Sb metal pellet with a high flux of thermal neutrons in a nuclear reactor. The design of the source shielding structure makes for easy transportation and deployment. A hydrogen gas proportional counter is used to characterize the neutrons emitted by the source and a NaI detector is used for gamma background characterization. At the exit opening of the neutron beam, the characterization determined the neutron flux in the energy range 20-25 keV to be 6.00±0.30 neutrons per cm2 per second and the total gamma flux to be 245±8 gammas per cm2 per second (numbers scaled to 1 GBq activity of the 124Sb source). A liquid scintillator detector is demonstrated to be sensitive to neutrons with incident kinetic energies from 8 to 17 keV, so it can be paired with the source as a backing detector for neutron scattering calibration experiments. This photoneutron source provides a good tool for in-situ low energy nuclear recoil calibration for dark matter experiments and coherent elastic neutrino-nucleus scattering experiments.

Published
2023

2. A backing detector for order-keV neutrons

Author

Biekert, A, Chaplinsky, L, Fink, CW, Garcia-Sciveres, M, Gillis, WC, Guo, W, Hertel, SA, Heuermann, G, Li, X, Lin, J, Mahapatra, R, McKinsey, DN, Patel, PK, Penning, B, Pinckney, HD, Platt, M, Pyle, M, Romani, RK, Serafin, A, Smith, RJ, Suerfu, B, Velan, V, Wang, G, Wang, Y, Watkins, SL, and Williams, MR

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Neutrondetector, Darkmatter, Nuclearrecoilcalibration, (6)Liscintillator, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
Abstract

We have designed and tested a large-area (0.15 m2) neutron detector based on neutron capture on 6Li. The neutron detector design has been optimized for the purpose of tagging the scattering angle of keV-scale neutrons. These neutron detectors would be employed to calibrate the low-energy (

Published
2022

3. SENSEI: Characterization of Single-Electron Events Using a Skipper Charge-Coupled Device

Author

Barak, L, Barak, L, Bloch, IM, Botti, A, Cababie, M, Cancelo, G, Chaplinsky, L, Chierchie, F, Crisler, M, Drlica-Wagner, A, Essig, R, Estrada, J, Etzion, E, Fernandez Moroni, G, Gift, D, Holland, SE, Munagavalasa, S, Orly, A, Rodrigues, D, Singal, A, Haro, MS, Stefanazzi, L, Tiffenberg, J, Uemura, S, Volansky, T, Yu, TT, Barak, L, Barak, L, Bloch, IM, Botti, A, Cababie, M, Cancelo, G, Chaplinsky, L, Chierchie, F, Crisler, M, Drlica-Wagner, A, Essig, R, Estrada, J, Etzion, E, Fernandez Moroni, G, Gift, D, Holland, SE, Munagavalasa, S, Orly, A, Rodrigues, D, Singal, A, Haro, MS, Stefanazzi, L, Tiffenberg, J, Uemura, S, Volansky, T, and Yu, TT

Abstract

We use a science-grade skipper charge-coupled device (skipper CCD) operating in a low-radiation background environment to develop a semiempirical model that characterizes the origin of single-electron events in CCDs. We identify, separate, and quantify three independent contributions to the single-electron events, which were previously bundled together and classified as "dark counts": dark current, amplifier light, and spurious charge. We measure a dark current, which depends on exposure, of (5.89±0.77)×10-4e-/pix/day, and an unprecedentedly low spurious charge contribution of (1.52±0.07)×10-4e-/pix, which is exposure independent. In addition, we provide a technique to study events produced by light emitted from the amplifier, which allows the detector's operation to be optimized to minimize this effect to a level below the dark-current contribution. Our accurate characterization of the single-electron events allows one to greatly extend the sensitivity of experiments searching for dark matter or coherent neutrino scattering. Moreover, an accurate understanding of the origin of single-electron events is critical to further progress in ongoing research and development efforts of skipper and conventional CCDs.

Published
2022

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