Machine learning technique to improve anti-neutrino detection efficiency for the ISMRAN experiment

Mulmule, D.; Netrakanti, P. K.; Pant, L. M.; Nayak, B.

doi:10.1088/1748-0221/15/04/p04021

Cited by 7 publications

(5 citation statements)

References 47 publications

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“…6 (a)-(d), which are constructed from the sum energy, number of bars hit and energy depositions profile (E max and E 1 ) on event by event basis. The prompt signal from IBD and fast neutron exhibit characteristic differences in energy deposition profile [16]. These variables are selected from a variety of other variables and gives the best discriminatory powers.…”

Section: Status Of Ismran Experimentsmentioning

confidence: 99%

Status of ISMRAN experiment

Netrakanti

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experiment is the first indigenous effort in the country to measure the reactor based antineutrinos at very close distances (∼13 m) from the reactor core. The experiment is setup in DHRUVA research reactor and has been in the data taking mode since January 2022. The main goal of ISMRAN is to understand the Reactor Anti-neutrino Anamoly from a reactor core, which utilizes natural uranium as fuel. All previous measurements are performed using highly enriched 235 U fuel and observed a deficit of 4-6% in the antineutrino yield when compared with theory predictions. In this proceedings, we present first results from the complete ISMRAN setup at DHRUVA reactor hall. We will summarize the foreground activities that were carried out for the understanding of the ISMRAN detector response. A new generation of experiments for future, involving the measurement of reactor antineutrinos using coherent elastic scattering will also be discussed.

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Section: Status Of Ismran Experimentsmentioning

confidence: 99%

Status of ISMRAN experiment

Netrakanti

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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“…The measured timing resolution of ∼4 ns leads to a parameterized position resolution of ∼20 cm in a single PSB [29,35] and is almost uniform among the different bars. Due to the segmented geometry of the ISMRAN detector, we can exploit the timing and position information for the localization of an event in the ISMRAN array to differentiate an ν e event from a background event arising due to fast neutron [36,37]. The complex absorption and re-emission processes of optical photons are known to be an important source of the non-linear and non-uniform response of the charge deposition in the PSBs.…”

Section: Ismran Detector Responsementioning

confidence: 99%

Evaluation of the response of plastic scintillator bars and measurement of neutron capture time in non-reactor environment for the ISMRAN experiment

Dey,

Netrakanti,

Mishra

et al. 2022

Preprint

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We present a detailed study on detector response to different radioactive sources and the measurements of nonreactor environmental backgrounds with the Indian Scintillator Matrix for Reactor Anti-Neutrinos (ISMRAN) detector setup consisting of 9×10 Plastic Scintillator Bars (PSBs) array at BARC, Mumbai. These measurements are useful in the context of the ISMRAN detector setup, which will be used to detect the reactor anti-neutrinos (ν e ) and measure its energy spectra, through the inverse beta decay (IBD) process. A GEANT4 based Monte Carlo (MC) simulation is used to understand the optical transmission, energy resolution and energy non-linearity of the ISMRAN detector. A detailed analysis procedure has been developed to understand the natural radioactive, cosmogenic and cosmic muoninduced backgrounds with the ISMRAN detector setup in a non-reactor environment, based on their energy deposition, number of bars hit as well as topological event selection criteria in position and time for triggered events. Data and MC simulated distributions of reconstructed sum energy and number of bars hit has been compared for the radioactive γ + positron source such as 22 Na placed at the center of the ISMRAN array. Fast neutron energy response and capture time distribution in ISMRAN array has been studied using a novel technique involving Time of Flight (TOF) of the measured fast neutrons. The observed characteristic neutron capture time ( τ ) of 68.29 ± 9.48 µs is in good agreement with ∼65 µs obtained from MC simulation. These experimentally measured results will be useful for discriminating the correlated and uncorrelated background events from the true IBD events in reactor ON and OFF conditions inside the reactor hall.

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“…Stricter selection criteria based on event topology in segmented geometry and timing distribution among the PS bars can further improve the efficiency of prompt IBD events while rejecting the fast neutron background events. A machine learning approach using multi-layer perceptrons, the fast neutron background is discriminated with an efficiency of 80% from the prompt IBD signal [24]. However, due to small number of bars used in the current experimental setup, results from such a approach would be difficult to interpret and hence are not discussed in present work.…”

Section: Jinst 16 P08029mentioning

confidence: 99%

“…Hence, a detailed knowledge of the fast neutron deposited energy spectrum and response from fast neutrons in the PS bars would enable better optimization of efforts to identify such background events from true IBD events. A machine learning approach, using monte-carlo based simulated IBD events in ISMRAN detector, is used to demonstrate the discriminating capabilities of various backgrounds from real IBD events [24]. Fast neutron response using 𝐷-𝐷 and 𝐷-𝑇 reactions with plastic scintillator bars are earlier performed to estimate the energy response and sensitivity to the neutron flux in deep underground experiments [25].…”

Section: Introductionmentioning

confidence: 99%

Characterization of plastic scintillator bars using fast neutrons from D-D and D-T reactions

et al. 2021

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We report results of fast neutron response in plastic scintillator (PS) bars from deuterium-deuterium (D-D) and deuterium-tritium (D-T) reactions using Purnima Neutron Generator Facility, BARC, Mumbai. These measurements are useful in context of Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) detection, an array of 10×10 PS bars, used to measure reactor anti-neutrinos through inverse beta decay (IBD) signal. ISMRAN detector, an above-ground experiment close to the reactor core (∼13m), deals with an active fast neutron background inside the reactor hall. A good understanding of fast neutron response in PS bars is an essential pre-requisite for suppression and discrimination of fast neutron background from IBD events. A monoenergetic neutron beam from the fusion reaction of D-D at 2.45 MeV and D-T at 14.1 MeV are used to characterize the energy response in these bars. The neutron energy response function has been simulated using the GEANT4 package and are compared with the measured data. A reasonable agreement of deposited energies by fast neutrons in PS bars between data and simulation are obtained for these reactions. The ratio of energy deposition in adjacent bars is used to discriminate between prompt IBD, fast neutron and neutron capture cascade gamma events.

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Machine learning technique to improve anti-neutrino detection efficiency for the ISMRAN experiment

Cited by 7 publications

References 47 publications

Status of ISMRAN experiment

Status of ISMRAN experiment

Evaluation of the response of plastic scintillator bars and measurement of neutron capture time in non-reactor environment for the ISMRAN experiment

Characterization of plastic scintillator bars using fast neutrons from D-D and D-T reactions

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