scholarly journals Status of the Design of an Annihilation Detector to Observe Neutron-Antineutron Conversions at the European Spallation Source

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 76
Author(s):  
Sze-Chun Yiu ◽  
Bernhard Meirose ◽  
Joshua Barrow ◽  
Christian Bohm ◽  
Gustaaf Brooijmans ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Invariant Mass ◽  
Cosmic Ray ◽  
Baryon Number ◽  
Particle Identification ◽  
Design Studies ◽  
Baryon Number Violation ◽  
Spallation Source ◽  
Number Violation

The goal of the HIBEAM/NNBAR program is to search for baryon number violation via the conversion or oscillation of neutrons into sterile neutrons and/or antineutrons at the European Spallation Source. A key experimental component of the program is the construction of an annihilation detector to directly observe the production of an antineutron following the oscillation. Design studies for the annihilation detector are presented. The predicted response of the detector models are studied using Geant4 simulations made with Monte Carlo simulations of the annihilation signal topology and cosmic ray backgrounds. Particle identification and sensitive discriminating observables, such as invariant mass and sphericity, are shown.

scholarly journals Monte Carlo simulations and n-p differential scattering data measured with Proton Recoil Telescopes

2020 ◽  
Vol 239 ◽  
pp. 01024
Author(s):  
N. Terranova ◽  
O. Aberle ◽  
V. Alcayne ◽  
S. Amaducci ◽  
J. Andrzejewski ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Cross Section ◽  
Fission Cross Section ◽  
Particle Identification ◽  
Scattering Data ◽  
Section Data ◽  
Technology Applications ◽  
Primary Reference ◽  
Proton Recoil

The neutron-induced fission cross section of 235U, a standard at thermal energy and between 0.15 MeV and 200 MeV, plays a crucial role in nuclear technology applications. The long-standing need of improving cross section data above 20 MeV and the lack of experimental data above 200 MeV motivated a new experimental campaign at the n_TOF facility at CERN. The measurement has been performed in 2018 at the experimental area 1 (EAR1), located at 185 m from the neutron-producing target (the experiment is presented by A. Manna et al. in a contribution to this conference). The 235U(n,f) cross section from 20 MeV up to about 1 GeV has been measured relative to the 1H(n,n)1H reaction, which is considered the primary reference in this energy region. The neutron flux impinging on the 235U sample (a key quantity for determining the fission events) has been obtained by detecting recoil protons originating from n-p scattering in a C2H4 sample. Two Proton Recoil Telescopes (PRT), consisting of several layers of solid-state detectors and fast plastic scintillators, have been located at proton scattering angles of 25.07° and 20.32°, out of the neutron beam. The PRTs exploit the ΔE-E technique for particle identification, a basic requirement for the rejection of charged particles from neutron-induced reactions in carbon. Extensive Monte Carlo simulations were performed to characterize proton transport through the different slabs of silicon and scintillation detectors, to optimize the experimental set-up and to deduce the efficiency of the whole PRT detector. In this work we compare measured data collected with the PRTs with a full Monte Carlo simulation based on the Geant-4 toolkit.

Baryon-number violation at accelerator energies

1983 ◽  
Vol 28 (9) ◽  
pp. 2248-2257 ◽  
Author(s):  
Paul Langacker ◽  
Deshdeep Sahdev
Keyword(s):  
Baryon Number ◽  
Baryon Number Violation ◽  
Number Violation
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