The major achievements of the OPERA experiment and its legacy

2021 ◽  
pp. 2130004
Author(s):  
Giovanni De Lellis ◽  
Giuliana Galati
Keyword(s):  
Nuclear Emulsion ◽  
Neutrino Oscillations ◽  
Lead Target

The OPERA experiment was designed to discover the [Formula: see text] appearance in a pure [Formula: see text] beam, resulting from neutrino oscillations. The detector, located in the underground Gran Sasso Laboratory, consisted of an emulsion/lead target complemented by electronic detectors and was exposed, from 2008 to 2012, to the (CERN Neutrinos to Gran Sasso (CNGS)) beam, an almost pure [Formula: see text] beam with a baseline of 730 km, collecting a total of [Formula: see text] protons on target. OPERA was unique in its capability of detecting all three neutrino flavors. OPERA discovered [Formula: see text] oscillations in appearance mode with a significance of [Formula: see text]. In this review, we report the major achievements of the OPERA experiment and its legacy in the nuclear emulsion technology.

scholarly journals OPERA tau neutrino charged current interactions

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
N. Agafonova ◽  
A. Alexandrov ◽  
A. Anokhina ◽  
S. Aoki ◽  
A. Ariga ◽  
...  
Keyword(s):  
Neutrino Oscillations ◽  
Statistical Significance ◽  
Open Data ◽  
Photographic Emulsion ◽  
Charged Current ◽  
Lead Target ◽  
Tau Neutrino ◽  
Data Portal

AbstractThe OPERA experiment was designed to discover the vτ appearance in a vμ beam, due to neutrino oscillations. The detector, located in the underground Gran Sasso Laboratory, consisted of a nuclear photographic emulsion/lead target with a mass of about 1.25 kt, complemented by electronic detectors. It was exposed from 2008 to 2012 to the CNGS beam: an almost pure vμ beam with a baseline of 730 km, collecting a total of 1.8·1020 protons on target. The OPERA Collaboration eventually assessed the discovery of vμ→vτ oscillations with a statistical significance of 6.1 σ by observing ten vτ CC interaction candidates. These events have been published on the Open Data Portal at CERN. This paper provides a detailed description of the vτ data sample to make it usable by the whole community.

Neutrino oscillations in a medium with variable density

1986 ◽  
Vol 150 (12) ◽  
pp. 632
Author(s):  
S.P. Mikheev ◽  
A.Yu. Smirnov
Keyword(s):  
Neutrino Oscillations ◽  
Variable Density

Development of neutron spectrum unfolding method for advanced nuclear emulsion

2014 ◽  
Vol 4 ◽  
pp. 665-669 ◽  
Author(s):  
Shigetaka Maeda ◽  
Chikara Ito ◽  
Kohei Ishihara ◽  
Keisuke Takagi ◽  
Haruna Minato ◽  
...  
Keyword(s):  
Neutron Spectrum ◽  
Nuclear Emulsion ◽  
Spectrum Unfolding ◽  
Neutron Spectrum Unfolding ◽  
Unfolding Method

Weakly bound halo breakup of neutron- Li7 and nucleon- Be7 on a lead target

2020 ◽  
Vol 102 (6) ◽  
Author(s):  
B. Mukeru ◽  
T. Frederico ◽  
Lauro Tomio
Keyword(s):  
Lead Target ◽  
Weakly Bound

scholarly journals Neutrino oscillations with the MINOS, MINOS+, T2K, and NOvA experiments

2016 ◽  
Vol 18 (1) ◽  
pp. 015009 ◽  
Author(s):  
Tsuyoshi Nakaya ◽  
Robert K Plunkett
Keyword(s):  
Neutrino Oscillations

scholarly journals Neutron Imaging Using a Fine-Grained Nuclear Emulsion

2021 ◽  
Vol 7 (1) ◽  
pp. 4
Author(s):  
Katsuya Hirota ◽  
Tomoko Ariga ◽  
Masahiro Hino ◽  
Go Ichikawa ◽  
Shinsuke Kawasaki ◽  
...  
Keyword(s):  
Image Analysis ◽  
High Resolution ◽  
Neutron Detector ◽  
Nuclear Emulsion ◽  
Neutron Imaging ◽  
The Other ◽  
Crystal Oscillator ◽  
Fine Grained ◽  
Cold Neutrons ◽  
Track Analysis

A neutron detector using a fine-grained nuclear emulsion has a sub-micron spatial resolution and thus has potential to be applied as high-resolution neutron imaging. In this paper, we present two approaches to applying the emulsion detectors for neutron imaging. One is using a track analysis to derive the reaction points for high resolution. From an image obtained with a 9 μm pitch Gd grating with cold neutrons, periodic peak with a standard deviation of 1.3 μm was observed. The other is an approach without a track analysis for high-density irradiation. An internal structure of a crystal oscillator chip, with a scale of approximately 30 μm, was able to be observed after an image analysis.

Sign in / Sign up

Export Citation Format

Share Document