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

Abstract

We present a detailed study on detector response to different radioactive sources and the measurements of non-reactor environmental backgrounds with the Indian Scintillator Matrix for Reactor Anti-Neutrinos (ISMRAN) detector setup consisting of 9$\times$10 Plastic Scintillator Bars (PSBs) array at BARC, Mumbai. These measurements are useful in the context of the ISMRAN detector setup, which will be used to detect the reactor anti-neutrinos (${\bar{\ensuremathν}}_{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 muon-induced 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 $\gamma$ + positron source such as ${}^{22}\mathrm{Na}$ 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 ( $\tau$ ) of 68.29 $\pm$ 9.48 $\mu$s is in good agreement with $\sim$65 $\mu$s 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.

arXiv comment25 pages, 21 figures

References in corpus (29)

• Observation of electron-antineutrino disappearance at Daya Bay
• Observation of Reactor Electron Antineutrino Disappearance in the RENO Experiment
• The Reactor Antineutrino Anomaly
• Indication for the disappearance of reactor electron antineutrinos in the Double Chooz experiment
• Improved Predictions of Reactor Antineutrino Spectra
• On the determination of anti-neutrino spectra from nuclear reactors
• Sterile neutrino search at NEOS Experiment
• Measurement of electron antineutrino oscillation with 1958 days of operation at Daya Bay
• Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO
• Improved Short-Baseline Neutrino Oscillation Search and Energy Spectrum Measurement with the PROSPECT Experiment at HFIR
• Improved Sterile Neutrino Constraints from the STEREO Experiment with 179 Days of Reactor-On Data
• Online Monitoring of the Osiris Reactor with the Nucifer Neutrino Detector
• Spectral Measurement of the Electron Antineutrino Oscillation Amplitude and Frequency using 500 Live Days of RENO Data
• Experimental Results from an Antineutrino Detector for Cooperative Monitoring of Nuclear Reactors
• The 5 MeV bump - a nuclear whodunit mystery
• Fuel-composition dependent reactor antineutrino yield at RENO
• Extraction of the ${}^{235}$U and ${}^{239}$Pu Antineutrino Spectra at Daya Bay
• Reactor antineutrino monitoring with a plastic scintillator array as a new safeguards method
• Measurement of the Antineutrino Spectrum from ${}^{235}$U Fission at HFIR with PROSPECT
• Background Radiation Measurements at High Power Research Reactors
• A plastic scintillator array for reactor based anti-neutrino studies
• Search for Sub-eV Sterile Neutrino at RENO
• Measuring the Cosmic Ray Muon-Induced Fast Neutron Spectrum by (n,p) Isotope Production Reactions in Underground Detectors
• Active-sterile neutrino mixing constraint using reactor antineutrinos with the ISMRAN set-up
• Measurements using a prototype array of plastic scintillator bars for reactor based electron anti-neutrino detection
• Characterization of plastic scintillator bars using fast neutrons from D-D and D-T reactions
• Cosmic ray measurements using the ISMRAN setup in a non-reactor environment

Cited by in corpus (2)

• The neutron array of the compact spectrometer for heavy ion experiments in Fermi energy region
• Measurement of cosmic muon-induced neutron background with ISMRAN detector in a non-reactor environment