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SUMMARY:Spectrometry of cosmic-ray neutrons with the High Efficiency Neutr
 on Spectrometry Array
DTSTART;VALUE=DATE-TIME:20251120T091500Z
DTEND;VALUE=DATE-TIME:20251120T093000Z
DTSTAMP;VALUE=DATE-TIME:20260420T232342Z
UID:indico-contribution-29019@indico.ific.uv.es
DESCRIPTION:Speakers: Nil Mont Geli (Universitat Politècnica de Catalunya
 )\nThe High Efficiency Neutron Spectrometry Array (HENSA) project focuses 
 on the development and scientific application of high-efficiency neutron s
 pectrometers [1]\, with uses in underground laboratories\, rare-events exp
 eriments\, cosmic-ray neutron studies\, space weather research\, and envir
 onmental dosimetry. The detection principle of HENSA is based on the Bonne
 r Spheres System (BSS) [2]\, but incorporates a topological modification i
 n detector geometry\, achieving up to a tenfold increase in overall detect
 ion efficiency compared to standard BSS [3]. The extended-energy-range ver
 sion of HENSA is sensitive to neutrons from thermal energies up to 10 GeV\
 , enabling full-spectrum measurements of cosmic-ray neutrons. Its high eff
 iciency and wide energy sensitivity allow for the determination of the neu
 tron spectrum and the ambient neutron dose equivalent within 30–60-minut
 e intervals\, complementing ground data from the Neutron Monitor Network [
 4]. This capability enables near real-time analysis of spectral fluctuatio
 ns throughout the solar cycle and during high-intensity solar events\, suc
 h as Ground Level Enhancements (GLEs) and Forbush Decreases (FDs).\n\nIn 2
 020\, a HENSA detector was deployed in a measurement campaign to study the
  cosmic-ray neutron spectrum under quiet solar conditions at the beginning
  of Solar Cycle 25. This campaign enabled the mapping of cosmic-ray neutro
 ns across magnetic rigidities from 5.5 to 8.5 GV and altitudes from sea le
 vel to 3000 m\, complementing previous studies [5]. Building on these resu
 lts\, a new spectrometer\, HENSA++\, has been developed with optimized ene
 rgy resolution for cosmic-ray neutron studies. Since 2024\, HENSA++ has be
 gun commissioning\, first in Valencia city (sea level\, Rc = 7.5 GV) and l
 ater at the Observatorio Astrofísico de Javalambre (OAJ) in Teruel\, Spai
 n (1957 m above sea level\, Rc = 7.07 GV) [6].\n\nIn this talk\, we presen
 t an overview of the HENSA project for cosmic-ray neutron studies\, includ
 ing results from the 2020 measurement campaign and preliminary findings fr
 om the commissioning phase. Finally\, we discuss the status and future per
 spectives for continuous cosmic-ray neutron monitoring with HENSA++ during
  the second half of Solar Cycle 25.\n\n**References**\n[1] https://www.hen
 saproject.org/\n[2] D.J. Thomas and A.V. Alevra (2002). NIMA\, 476\, p. 12
 –20.\n[3] B. Wiegel\,  A.V. Alevra (2002). NIMA 476 (2002) 36–41.\n[4]
  https://www.nmdb.eu/\n[5] M. S. Gordon\, et al. (2004). IEEE Transactions
  on Nuclear Science\, 51(6)\n[6] https://www.cefca.es/observatorio/descrip
 cion\n\nhttps://indico.ific.uv.es/event/8035/contributions/29019/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29019/
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