Neutron events in the underground monitor of the Tien Shan high-altitude station

Chubenko, A. P.; Shchepetov, A. L.; Vildanova, L. I.; Vildanova, Marina; Chubenko, P. A.

doi:10.3103/s1068335607040033

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…The top pair of spectra shown in this plot were calculated for the events registered in either the upper or in the lower unit of the vertical neutron calorimeter under the control of the corresponding internal trigger which has been generated at the moment of the fast transient increase of neutron multiplicity inside the unit; generally, these spectra are similar to old ones published in [11]. Another spectra pair with much lower absolute intensity shown at the bottom of Fig.…”

Section: First Eas Measurementssupporting

confidence: 55%

Modern status of the Tien-Shan cosmic ray station

et al. 2017

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Section: First Eas Measurementssupporting

confidence: 55%

Modern status of the Tien-Shan cosmic ray station

et al. 2017

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“…The underground neutron detectors. The development of the large-sized neutron detector complex in the underground room of the Tien Shan moun- tain station was inspired by former observation there of numerous neutron events whose intensity seems to be unexpectedly high in comparison with what should be expected from the nuclear interaction of cosmic ray muons, and which nature still remains unclear [41,42]. Originally, the newly planned set of underground neutron detectors was constructed mainly for the study of this phenomenon.…”

Section: Neutron Detectors Of the Nuclear-active Cosmic Ray Componentmentioning

confidence: 99%

New complex EAS installation of the Tien Shan mountain cosmic ray station

Chubenko

Shepetov

Antonova

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper we present a description of the new complex installation for the study of extensive air showers which was created at the Tien Shan mountain cosmic ray station, as well as the results of the test measurements made there in 2014-2016. At present, the system for registration of electromagnetic shower component consists of ∼100 detector points built on the basis of plastic scintillator plates with the sensitive area of 0.25m 2 and 1m 2 , spread equidistantly over ∼10 4 m 2 space. The dynamic range of scintillation amplitude measurements is currently about (3 − 7) · 10 4 , and there is a prospect of it being extended up to ∼10 6 . The direction of shower arrival is defined by signal delays from a number of the scintillators placed cross-wise at the periphery of the detector system. For the investigation of nuclear active shower components there was created a multi-tier 55m 2 ionization-neutron calorimeter with a sum absorber thickness of ∼1000g/cm 2 , typical spatial resolution of the order of 10cm, and dynamic range of ionization measurement channel about ∼10 5 . Also, the use of saturation-free neutron detectors is anticipated for registration of the high-and lowenergy hadron components in the region of shower core. A complex of underground detectors is designed for the study of muonic and penetrative nuclear-active components of the shower.The full stack of data acquisition, detector calibration, and shower parameters restoration procedures are now completed, and the newly obtained shower size spectrum and lateral distribution of shower particles occur in agreement with conventional data. Future studies in the field of 10 14 − 10 17 eV cosmic ray physics to be held at the new shower installation are discussed.

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“…Same Geant4 simulation model can be of use to answer the question which was put in [1] on nature of the underground neutron events. Taking into consideration the spectrum of energy deposits from penetrative cosmic ray particles which has been measured earlier in the same underground room of Tien Shan station in experiments with the ionization calorimeter [8], and using it as the input for the Geant4 simulation series with µ ± type primaries one can obtain the expected neutron multiplicity spectrum of underground events.…”

Section: The Underground Neutron Monitormentioning

confidence: 99%

“…Investigation of the events of multiple neutron production in underground detectors of the Tien Shan mountain cosmic ray station was started about a decade ago. Phenomenological results which have been obtained then on the properties of these events were reported in [1,2,3]; in these publications it was stated that the original nature of neutron events observed underground still remains unclear. After completion of modification period of the complex detector system for the cosmic ray studies at Tien Shan station [4], and after systematic introduction of the Geant4 package based simulation methods for determination of the properties of its particle detectors it became possible to return to the problem of underground neutron events at new stage of experimental technique.…”

Section: Introductionmentioning

confidence: 99%

Underground neutron events at Tien Shan and the properties of the $10^{14}-10^{17}$ eV EAS muonic component

Shepetov,

Chubenko,

Kryakunova

et al. 2019

Preprint

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The events of multiple neutron production under 2000 g/cm 2 thick rock absorber were studied at the Tien Shan mountain cosmic ray station, at the altitude of 3340 m above the sea level. From comparison of the experimental and Geant4 simulated neutron multiplicity spectra it follows that the great bulk of these events can be explained by interaction of cosmic ray muons with internal material of the neutron detector. In synchronous operation of the underground neutron monitor with the Tien Shan shower detector system it was found that the characteristics of the muonic component of extensive air showers which is seemingly responsible for generation of the neutron events underground do change noticeably within the energy range of the knee of primary cosmic ray spectrum. Some peculiar shower events were detected when the neutron signal reveals itself only ∼(100-1000) µs after the passage of the shower particles front which probably means an existence of corresponding delay of the muon flux in such events.

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Neutron events in the underground monitor of the Tien Shan high-altitude station

Cited by 8 publications

References 3 publications

Modern status of the Tien-Shan cosmic ray station

Modern status of the Tien-Shan cosmic ray station

New complex EAS installation of the Tien Shan mountain cosmic ray station

Underground neutron events at Tien Shan and the properties of the $10^{14}-10^{17}$ eV EAS muonic component

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