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Environmental sub-MeV neutron measurement at the Gran Sasso surface laboratory with a super-fine-grained nuclear emulsion detector by Shiraishi, T.; Akamatsu, S.; Naka, T.; Asada, T.; De Lellis, G.; Tioukov, V.; Rosa, G.; Kobayashi, R.; Ambrosio, N.; Alexandrov, A.; Sato, O. is a scholarly article available to read on EtoBox.

What is Environmental sub-MeV neutron measurement at the Gran Sasso surface laboratory with a super-fine-grained nuclear emulsion detector about?

The measurement of environmental neutrons is particularly important in the search for new physics, such as dark matter particles, because neutrons constitute an often-irreducible background source. The measurement of the neutron energy spectra in the sub-MeV scale is technically difficult because it requires a very good energy resolution and a very high $\gamma$-ray rejection power. In this study, we used a super-fine-grained nuclear emulsion, called Nano Imaging Tracker (NIT), as a neutron detector. The main target of neutrons is the hydrogen (proton) content of emulsion films. Through a topological analysis, proton recoils induced by neutron scattering can be detected as tracks with sub-micrometric accuracy. This method shows an extremely high $\gamma$-ray rejection power, at the level of $5 \times 10^7 ~ \gamma/\rm{cm}^2$, which is equivalent to 5 years accumulation of environmental $\gamma$-rays, and a very good energy and direction resolution even in the sub-MeV energy region. In order to carry out this measurement with sufficient statistics, we upgraded the automated scanning system to achieve a speed of 250 g/year/machine. We calibrated the detector performance of this syste

Author

Shiraishi, T.; Akamatsu, S.; Naka, T.; Asada, T.; De Lellis, G.; Tioukov, V.; Rosa, G.; Kobayashi, R.; Ambrosio, N.; Alexandrov, A.; Sato, O.

Published

2022

Language

EN