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SUMMARY:Unfolding methods for reconstructing the spectrum of spectator neu
 trons obtained by the HGND prototype in the BM@N experiment
DTSTART;VALUE=DATE-TIME:20261028T132000Z
DTEND;VALUE=DATE-TIME:20261028T133500Z
DTSTAMP;VALUE=DATE-TIME:20261028T172923Z
UID:indico-contribution-6329@cern.ch
DESCRIPTION:Speakers: Aleksandr Zubankov (INR RAS)\nThe development of a H
 ighly Granular Time-of-Flight Neutron Detector (HGND) for measuring neutro
 n yields and flow in the 0.3-4 GeV kinetic energy range in nuclear collisi
 ons at the BM@N experiment is almost finished. To validate the concept of 
 the full-scale HGND\, a compact HGND prototype was tested in 3.8A GeV 124X
 e collisions with a CsI target in the BM@N experiment in 2022. The prototy
 pe was positioned at an angle of 0 degrees to the undeflected beam axis in
  order to measure the yields of spectator neutrons resulting from hadronic
  interactions of nuclei\, as well as the yields of neutrons resulting from
  electromagnetic dissociation (EMD) of projectile nuclei [2].\n\nDespite t
 he high neutron detection efficiency and relatively good time resolution o
 f the HGND prototype of approximately 270 ps\, it is insufficient for meas
 uring high-energy neutrons. The measured neutron kinetic energy spectra\, 
 reconstructed using the time-of-flight method\, are significantly smeared 
 due to the contribution of the time resolution. In order to restore the tr
 ue neutron kinetic energy spectrum from the distorted reconstructed spectr
 um\, an unfolding procedure was used [3]. This method of spectrum reconstr
 uction uses the measured kinetic energy spectrum as input data\, as well a
 s the detector response matrix and background estimations obtained through
  the detector response simulation in the complete geometry of the BM@N set
 up using the DCM-QGSM-SMM and UrQMD-AMC models as event generators. An int
 ercomparison of the various unfolding methods implemented in the RooUnfold
  framework for reconstructing the neutron spectrum was conducted.\n\nThis 
 approach allows the measurement of double-differential inclusive cross sec
 tions of forward neutron emission as a function of rapidity and solid angl
 e even with limited time resolution. In order to validate the approach\, m
 easurements of neutrons from EMD were performed\, as these neutrons are ch
 aracterised by a very narrow energy distribution\, centred around the proj
 ectile beam energy [4].\n\nReferences\n\n 1. S. Morozov et al.\, Nucl. Ins
 trum. Meth. A 1072\, 170152 (2025).\n 2. A. Zubankov et al.\, Nucl. Sci. T
 ech. 36\, 226 (2025).\n 3. L. Brenner et al.\, Int. J. Mod. Phys. A\, 35 (
 24)\, 2050145 (2020).\n 4. I.A. Pshenichnov et al.\, Int. J. Mod. Phys. E 
 33\, 2441007 (2024).\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6329/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6329/
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