{DEMAND}: {A}n organic glass scintillator array for direct measurements of (α,n) and (p,n) reactions in…

Abstract

We have developed an array of up to 20 organic glass scintillator detectors, each consisting of a 3 cm×3 cm×3 cm scintillator cube coupled to a photomultiplier tube. Sensitive to neutrons from a few hundred keV to several tens of MeV, the array was designed for use with recoil separators in inverse-kinematics measurements of astrophysical (α,n) and (p,n) reactions. It provides a prompt start signal for identifying recoil-neutron coincidences from the recoil time of flight. We characterize eight detectors used in an inverse-kinematics measurement of ²²Ne(α,n)²⁵Mg, using source and in-beam data. From the widths of γ-ray Compton-edge peaks at 311, 341, 477, and 1062 keVee, we find an energy resolution described by FWHM(E)/E=√(A²/E+B²/E²+C²), with A=0.00(7), B=0.0618(54), and C=0.135(5). The time-difference spectrum of nearest-neighbor γ-γ coincidences from a ²²Na source (250--600 keVee) gives a FWHM coincidence timing resolution of 910(40) ps, corresponding to a single-detector resolution of 640(30) ps. Mixed neutron-γ fields from the in-beam reaction and a ²⁴¹AmBe source show pulse-shape discrimination with an n-γ figure of merit >1 down to about 100 keVee. Below 100 keVee, the total neutron yield can still be extracted using two-Gaussian fits to energy-gated pulse-shape discrimination spectra. Monte Carlo simulations of the present ²²Ne(α,n)²⁵Mg measurement give a neutron singles detection efficiency of $1.56(45)%$, with uncertainty dominated by systematic effects in the simulation inputs.

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BibTeX

@misc{christian2026demand,
  title = {{DEMAND: An organic glass scintillator array for direct measurements of $(α,n)$ and $(p,n)$ reactions in inverse kinematics}},
  author = {G. Christian and B. J. Reed and G. Lotay and G. Bartram and S. Blackmore and D. T. Doherty and A. Katrusiak and J. Henderson and D. A. Hutcheon and A. Lennarz and M. Loria and J. O'Neill and C. O'Shea and C. J. Paxman and C. Ruiz and L. Wagner and M. Williams},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.40189},
  eprint = {2610.40189},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.40189},
}

RIS

TY  - UNPB
TI  - {DEMAND}: {A}n organic glass scintillator array for direct measurements of (α,n) and (p,n) reactions in inverse kinematics
AU  - G. Christian
AU  - B. J. Reed
AU  - G. Lotay
AU  - G. Bartram
AU  - S. Blackmore
AU  - D. T. Doherty
AU  - A. Katrusiak
AU  - J. Henderson
AU  - D. A. Hutcheon
AU  - A. Lennarz
AU  - M. Loria
AU  - J. O'Neill
AU  - C. O'Shea
AU  - C. J. Paxman
AU  - C. Ruiz
AU  - L. Wagner
AU  - M. Williams
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.40189
UR  - https://arxiv.org/abs/2610.40189
AB  - We have developed an array of up to 20 organic glass scintillator detectors, each consisting of a 3 cm×3 cm×3 cm scintillator cube coupled to a photomultiplier tube. Sensitive to neutrons from a few hundred keV to several tens of MeV, the array was designed for use with recoil separators in inverse-kinematics measurements of astrophysical (α,n) and (p,n) reactions. It provides a prompt start signal for identifying recoil-neutron coincidences from the recoil time of flight. We characterize eight detectors used in an inverse-kinematics measurement of ^22Ne(α,n)^25Mg, using source and in-beam data. From the widths of γ-ray Compton-edge peaks at 311, 341, 477, and 1062 keVee, we find an energy resolution described by FWHM(E)/E=√(A^2/E+B^2/E^2+C^2), with A=0.00(7), B=0.0618(54), and C=0.135(5). The time-difference spectrum of nearest-neighbor γ-γ coincidences from a ^22Na source (250--600 keVee) gives a FWHM coincidence timing resolution of 910(40) ps, corresponding to a single-detector resolution of 640(30) ps. Mixed neutron-γ fields from the in-beam reaction and a ^241AmBe source show pulse-shape discrimination with an n-γ figure of merit >1 down to about 100 keVee. Below 100 keVee, the total neutron yield can still be extracted using two-Gaussian fits to energy-gated pulse-shape discrimination spectra. Monte Carlo simulations of the present ^22Ne(α,n)^25Mg measurement give a neutron singles detection efficiency of $1.56(45)%$, with uncertainty dominated by systematic effects in the simulation inputs.
ER  -

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