scholarly journals Design and Diagnostics of High-Precision Accelerator Neutrino Beams

2021 ◽  
Vol 11 (4) ◽  
pp. 1644
Author(s):  
Nikolaos Charitonidis ◽  
Andrea Longhin ◽  
Michelangelo Pari ◽  
Elisabetta Giulia Parozzi ◽  
Francesco Terranova
Keyword(s):  
Ab Initio ◽  
Neutrino Oscillation ◽  
High Precision ◽  
Cross Sections ◽  
Neutrino Energy ◽  
Event Reconstruction ◽  
Cent Level ◽  
The Cross

Neutrino oscillation physics has entered a new precision era, which poses major challenges to the level of control and diagnostics of the neutrino beams. In this paper, we review the design of high-precision beams, their current limitations, and the latest techniques envisaged to overcome such limits. We put emphasis on “monitored neutrino beams” and advanced diagnostics to determine the flux and flavor of the neutrinos produced at the source at the per-cent level. We also discuss ab-initio measurements of the neutrino energy–i.e., measurements performed without relying on the event reconstruction at the ν detector–to remove any flux induced bias in the determination of the cross sections.

scholarly journals Nuclear Effects in Neutrino Interactions and Their Impact on the Determination of Oscillation Parameters

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Omar Benhar ◽  
Noemi Rocco
Keyword(s):  
Neutrino Oscillation ◽  
Cross Sections ◽  
Reaction Mechanisms ◽  
Quantitative Description ◽  
Impulse Approximation ◽  
Neutrino Energy ◽  
Long Baseline ◽  
Nuclear Effects ◽  
The Impact

The quantitative description of the effects of nuclear dynamics on the measured neutrino-nucleus cross sections—needed to reduce the systematic uncertainty of long baseline neutrino oscillation experiments—involves severe difficulties. Owing to the uncertainty on the incoming neutrino energy, different reaction mechanisms contribute to the cross section measured at fixed energy and scattering angle of the outgoing lepton, and must therefore be consistently taken into account within a unified model. We research the theoretical approach based on the impulse approximation and the use of realistic nucleon spectral functions, allowing one to describe a variety of reaction mechanisms active in the broad kinematical range covered by neutrino experiments. The extension of this scheme to include more complex mechanisms involving the two-nucleon currents, which are believed to be important, is also outlined. The impact of nuclear effects on the determination of neutrino oscillation parameters is illustrated by analyzing the problem of neutrino energy reconstruction.

The determination of the cross sections for the reactions 27 Al( n , α ) and 56 Fe( n , p ) for 14 MeV neutrons by an absolute method

1966 ◽  
Vol 292 (1429) ◽  
pp. 180-192 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Standard Error ◽  
Particle Method ◽  
Systematic Errors ◽  
Aluminium Foil ◽  
The Mean ◽  
The Cross ◽  
Experimental Values

Measurements of the cross sections for the reactions 27 Al( n , α ) 24 Na and 56 Fe( n, p ) 56 Mn for neutrons of energy 13.5 ± 0.1 MeV have been made by a radioactivation method. The neutron flux was determined by a variant of the 'associated particle’ method, in which the α -particles produced concurrently with the neutrons from the D + T reaction were estimated in terms of the volume of helium which accumulated when they were brought to rest in an aluminium foil. Cross section values obtained at 13.5 MeV were: for 27 Al( n , α ): 118.1 ± 6.0 mb : for 56 Fe( n, p ): 106.7 ± 4.7 mb. The errors quoted include both the standard error on the mean of the experimental values and an estimate of possible residual systematic errors. The excitation functions for both reactions in the energy region 13.5 to 14.8 MeV have also been investigated, in order to provide secondary cross section values over this range of energies. At 14.8 MeV the values found were: 27 Al( n , α )103.6 ± 5.5 mb; 56 Fe( n, p )96.7 ± 4.5 mb.

scholarly journals Determination of the cross sections for the production of fragments from relativistic nucleus-nucleus interactions. II. Parametric fits

1990 ◽  
Vol 42 (6) ◽  
pp. 2530-2545 ◽  
Author(s):  
J. R. Cummings ◽  
W. R. Binns ◽  
T. L. Garrard ◽  
M. H. Israel ◽  
J. Klarmann ◽  
...  
Keyword(s):  
Cross Sections ◽  
Relativistic Nucleus ◽  
The Cross

Ab initio calculation of the cross sections for electron impact vibrational excitation of CO via the 2Π shape resonance

2016 ◽  
Vol 144 (10) ◽  
pp. 104303 ◽  
Author(s):  
Michael F. Falcetta ◽  
Mark C. Fair ◽  
Emily M. Tharnish ◽  
Lorna M. Williams ◽  
Nathan J. Hayes ◽  
...  
Keyword(s):  
Ab Initio ◽  
Electron Impact ◽  
Cross Sections ◽  
Ab Initio Calculation ◽  
Vibrational Excitation ◽  
Shape Resonance ◽  
The Cross

scholarly journals Automated flow injection method for the high precision determination of drift tube ion mobility collision cross sections

The Analyst ◽  
2018 ◽  
Vol 143 (7) ◽  
pp. 1556-1559 ◽  
Author(s):  
Charles M. Nichols ◽  
Jody C. May ◽  
Stacy D. Sherrod ◽  
John A. McLean
Keyword(s):  
High Precision ◽  
Cross Sections ◽  
Flow Injection ◽  
Ion Mobility ◽  
Drift Tube ◽  
Automated Method ◽  
Precision Determination ◽  
Collision Cross Sections ◽  
High Precision Determination

This work presents a fully automated method to generate absolute Collision Cross Sections for annotated libraries.

scholarly journals Deuteron breakup at zero angle in the Coulomb nuclear field

2019 ◽  
Vol 204 ◽  
pp. 10011
Author(s):  
Igor Sitnik
Keyword(s):  
Cross Section ◽  
High Precision ◽  
Cross Sections ◽  
High Energy Physics ◽  
Nuclear Research ◽  
High Energy ◽  
Deuteron Breakup ◽  
The Cross ◽  
Cross Section Maximum ◽  
Energy Physics

Deuteron breakup cross sections on the C and CH2 targets have been measured up to the proton internal momenta of 0.3 GeV/c. The cross-sections 12C(d, p)X and 1H(d, p)X reactions have been obtained with high precision. The obtained data are compared with previous measurements. The behavior features in the vicinity of the cross section maximum were studied in dependence on the transversal momentum in the region of 0.01 < pt < 0.16 GeV/c. The measurements have been performed at the Veksler Baldin Laboratory of High Energy Physics of the Joint Institute for Nuclear Research.

Processus non réactifs dans les collisions H2 + H(2s) aux énergies thermiques

1990 ◽  
Vol 68 (2) ◽  
pp. 206-213
Author(s):  
B. Stern
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Rotation ◽  
Collision Energy ◽  
Close Coupling ◽  
Interference Phenomenon ◽  
The Cross ◽  
Energy Surfaces

Ab initio calculations of energy surfaces of the system [Formula: see text] corresponding to dissociation into H(2s) + H2 (X, 1Σg+) and H(2p0) + H2(X) are presented. For a thermal collision energy (0,064 eV), multistate close-coupling calculations are performed. In relation to experiments in progress, elastic and inelastic differential rotation cross sections are shown. For the quenching of H(2s) by H2:[Formula: see text]the cross section is obtained from an interference phenomenon between the elastic amplitudes associated to the two molecular states related to the entrance and exit channels, respectively. After criticizing the models used for the collision, which are valid only for small scattering angles, improvements are proposed in conclusion.[Journal translation]

scholarly journals Resonance phenomena in the interaction of fast neutrons with beryllium and aluminium

1947 ◽  
Vol 192 (1028) ◽  
pp. 114-127 ◽  
Keyword(s):  
Energy Level ◽  
Cross Section ◽  
Neutron Energy ◽  
Cross Sections ◽  
Accurate Determination ◽  
Fast Neutrons ◽  
Transmission Method ◽  
The Cross ◽  
Scattering Cross Sections

The total scattering cross-sections of beryllium and aluminium have been measured by a transmission method for neutrons of energies between 0∙35 and 0∙55 MeV and 1∙8 and 4∙0 MeV. Resonances have been found in the scattering by beryllium at a neutron energy of 2∙6 MeV and in the scattering by aluminium at neutron energies of 2∙4 and 2∙9 MeV. It has been shown that the cross-section for the reaction 9 Be ( n , α ) 6 He also has a resonance at 2∙6 MeV, and an accurate determination of the cross-section for this reaction has been made. A discussion is given of the properties of the energy level in 10 Be responsible for the resonances in the case of beryllium.

The determination of cross sections for quenching of resonance radiation of metal atoms III. Results for thallium

1968 ◽  
Vol 303 (1475) ◽  
pp. 467-475 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Cross Section ◽  
Cross Sections ◽  
Rate Constants ◽  
Resonance Radiation ◽  
Metal Atoms ◽  
The Cross

The intensity of fluorescence of thallium has been measured in hydrogen-oxygen flames diluted with each of the gases, argon, helium, nitrogen and carbon dioxide and the measurements used to obtain the following values for the quenching cross section (Å 2 ) for the 7 s 2 S ½ state of thallium σ 2 H 2 = 0.03, σ 2 O 2 = 13.2 ± 1.5, σ 2 N 2 = 6.4 ± 0.2, σ 2 H 2 O = 1.75 ± 0.2, σ 2 CO = 13.6 ± 0.8, σ 2 CO 2 = 32.5 ± 1.5, σ 2 Ar ≤ 0.1, σ 2 He ≤ 0.12. These values for the cross sections have been used to re-calculate the rate constants of the reactions, Tl + H + X → H X + Tl*, where X = H, OH, Cl or Br, from the data obtained by Phillips & Sugden (1961). The re-calculated values are lower than the original ones by a factor of 2.2.

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