The study of the thermal neutron flux in the deep underground laboratory DULB-4900

Алексеенко, В. В.; Gavrilyuk, Yu. M.; Gangapshev, A. M.; Gezhaev, A. M.; Dzhappuev, D. D.; Kazalov, V. V.; Kudzhaev, A. U.; Kuzminov, V. V.; Panasenko, S. I.; Ratkevich, S. S.; Tekueva, D. A.; Yakimenko, S. P.

doi:10.1134/s1063779616060022

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…At Baksan Neutrino Observatory (Russia) neutron flux was studied by using a liquid scintillator detector combined with 3 He proportional counters uniformly distributed within the scintillator volume [6]. In addition, the thermal neutron flux was measured recently at the Baksan Neutrino Observatory [7] by using a scintillator detector based on 6 LiF:ZnS(Ag) components. The 3 He proportional counters were used at Canfranc Underground Laboratory (Spain) [8], Kamioka neutrino observatory (Japan) [9], and YangYang underground laboratory (South Korea) [10].…”

Section: Introductionmentioning

confidence: 99%

A large area detector for thermal neutron flux measurements at the KamLAND site

Kozlov

Chernyak

2018

Nuclear Instruments and Methods in Physics Research Section A:

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A large area (0.5 m × 0.5 m) thermal neutron detector was developed based on 0.32 mm-thick 6 LiF:ZnS(Ag) scintillator sheets. The detector was constructed for measurements of seasonal variations in low intensity thermal neutron flux at deep underground sites. The detector response to neutrons was studied using a low intensity 241 Am/ 9 Be(α,n) neutron source. The digital pulse shape discrimination technique was applied to separate neutron capture events from the background caused by traces of α-emitters from Uranium and Thorium decay chains in scintillator components. The thermal neutron detection efficiency was 0.368±0.018 (0.155±0.009) before (after) event selection based on the digital pulse shape discrimination method. The measured α-particle background event rate in the 6 LiF:ZnS(Ag) scintillator was (4.88±0.06(stat))×10 −6 α cm −2 sec −1 . As a test of detector performance we measured the thermal neutron flux at the KamLAND area of the Kamioka neutrino observatory and compared it with result of the neutron flux measurement carried out at the Super-Kamiokande site. The thermal neutron flux at KamLAND was (6.43±0.50)×10 −6 n cm −2 sec −1 that included ∼10 % contribution from neutrons with energies above 1 eV. During the detector construction we identified a source of high amplitude noise pulses generated by 5-inch R1250 photomultipliers manufactured by Hamamatsu Photonics K. K..

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Section: Introductionmentioning

confidence: 99%

A large area detector for thermal neutron flux measurements at the KamLAND site

Kozlov

Chernyak

2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…At DULB-4900 (4900 m.w.e.) the same authors observed a seasonal variation in the absolute air humidity with maximum in summer and a correlated variation of ≈ 5% in the thermal neutron rate [21]. The increase of the thermal rate with the humidity was attributed to a better moderation of the neutrons both in the humid air and when exiting from a humid rock as well as higher albedo of the neutrons incoming into the rock.…”

Section: Long-term Evolution Of the Environmental Datamentioning

confidence: 82%

“…A limited number of studies show the time evolution of the thermal neutron rate in UG laboratories, employing 6 LiF+ZnS(Ag) scintillators with sensitivity to the thermal range [15,20,21]. The present study is, to our knowledge, the first long-term measurement carried out with a spectrometer composed of moderated 3 He counters with sensitivity over a wide range of neutron energies.…”

Section: Introductionmentioning

confidence: 88%

Long-term evolution of the neutron rate at the Canfranc Underground Laboratory

Orrigo

Taı́n

Mont-Geli³

et al. 2022

Eur. Phys. J. C

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We report results on the long-term variation of the neutron counting rate at the Canfranc Underground Laboratory, of importance for several low-background experiments installed there, including rare-event searches. The measurement campaign was performed employing the High Efficiency Neutron Spectrometry Array (HENSA) mounted in Hall A and lasted 412 live days. The present study is the first long-term measurement of the neutron rate with sensitivity over a wide range of neutron energies (from thermal up to 0.1 GeV and beyond) performed in any underground laboratory so far. Data on the environmental variables inside the experimental hall (radon concentration, air temperature, air pressure and humidity) were also acquired during all the measurement campaign. We have investigated for the first time the evolution of the neutron rate for different energies of the neutrons and its correlation with the ambient variables.

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Section: Introductionmentioning

confidence: 89%

Long-term evolution of the neutron rate at the Canfranc Underground Laboratory

Orrigo¹,

Tain²,

Mont-Geli³

et al. 2022

Preprint

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We report results on the long-term variation of the neutron rate at the Canfranc Underground Laboratory, of importance for the rare event searches located there. The measurement campaign was performed employing the High Efficiency Neutron Spectrometry Array (HENSA) mounted in Hall A and lasted 412 live days. The present study is the first long-term measurement of the neutron rate with sensitivity over a wide range of neutron energies (from thermal to 10 GeV) carried on in any underground laboratory so far. Data on the environmental variables inside the experimental hall (radon concentration, air temperature, pressure and humidity) were also acquired during all the measurement campaign. We have investigated for the first time the evolution of the neutron rate for different energies of the neutrons and its connection with the ambient variables.

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The study of the thermal neutron flux in the deep underground laboratory DULB-4900

Cited by 6 publications

References 7 publications

A large area detector for thermal neutron flux measurements at the KamLAND site

A large area detector for thermal neutron flux measurements at the KamLAND site

Long-term evolution of the neutron rate at the Canfranc Underground Laboratory

Long-term evolution of the neutron rate at the Canfranc Underground Laboratory

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