Neutron background measurements in the Underground Laboratory of Modane

Chazal, V.; Brissot, R.; Cavaignac, J.F.; Chambon, B.; Jésus, M. de; Drain, D.; Giraud‐Héraud, Y.; Pastor, C.; Stutz, A.; Vagneron, L.

doi:10.1016/s0927-6505(98)00012-7

Cited by 79 publications

(22 citation statements)

References 28 publications

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“…Radioassays of the concrete yielded 1:90 AE 0:05 ppm 232 Th and 0:850 AE 0:081 ppm 238 U, of the steel, 3:20 AE 0:25 ppb 232 Th and 2:9 AE 0:2 ppb 238 U. The results are at the same level as those recorded in other underground locations such as Canfranc, Modane, and Gran Sasso [12][13][14]. Monte Carlo simulations of the on-detector neutron field, which include all shielding materials and account for spontaneous fission plus decay-induced (, n) reactions, show negligible variations for concrete thicknesses !…”

supporting

confidence: 76%

First Results of the Phase II SIMPLE Dark Matter Search

et al. 2010

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We report results of a 14.1 kg d measurement with 15 superheated droplet detectors of total active mass 0.208 kg, comprising the first stage of a 30 kg d Phase II experiment. In combination with the results of the neutron-spin sensitive XENON10 experiment, these results yield a limit of |a(p)|<0.32 for M(W)=50 GeV/c² on the spin-dependent sector of weakly interacting massive particle-nucleus interactions with a 50% reduction in the previously allowed region of the phase space, formerly defined by XENON, KIMS, and PICASSO. In the spin-independent sector, a limit of 2.3×10⁻⁵ pb at M(W)=45 GeV/c² is obtained.

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supporting

confidence: 76%

First Results of the Phase II SIMPLE Dark Matter Search

et al. 2010

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“…It was created in 1983 in order to conduct particle physics and astrophysics experiments in a strongly reduced cosmic ray background environment. Due to the depth of the LSM, the average particle flux inside the laboratory is extremely reduced [26]: about 4 muons/ m 2 /day corresponding to a two million reduction factor compared to the flux at sea-level; a few 10 3 fast neutrons/m 2 /day (depending on the neutron energy and the measurement location in the laboratory) emitted by natural radioactivity from the rock, the neutron component of cosmic rays being totally eliminated at this depth. In addition, the Radon in the laboratory is maintained at a very low rate of $20 Bq/m 3 owing to an air purification system which totally renews the volume of the air inside the laboratory twice an hour.…”

Section: The Underground Laboratory Of Modane (Lsm)mentioning

confidence: 99%

Soft-errors induced by terrestrial neutrons and natural alpha-particle emitters in advanced memory circuits at ground level

Autran

Munteanu

Roché

et al. 2010

Microelectronics Reliability

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“…The neutron background at deep underground laboratories was investigated by several research groups. The 6 Li-loaded liquid scintillator detectors were used at Modane (France) [4] and at Gran Sasso (Italy) underground laboratories [5]. 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].…”

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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Neutron background measurements in the Underground Laboratory of Modane

Cited by 79 publications

References 28 publications

First Results of the Phase II SIMPLE Dark Matter Search

First Results of the Phase II SIMPLE Dark Matter Search

Soft-errors induced by terrestrial neutrons and natural alpha-particle emitters in advanced memory circuits at ground level

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

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