10 research outputs found
{Rebuttal to: Comments on 'The HARP Time Projection Chamber: Characteristics and physics performance'}
No full textMeasurement of the production cross-section of positive pions in p-Al collisions at 12.9 GeV/c
No full textA precision measurement of the double-differential production cross-section, , for pions of positive charge, performed in the HARP experiment is presented. The incident particles are protons of 12.9 GeV/c momentum impinging on an aluminium target of 5% nuclear interaction length. The measurement of this cross-section has a direct application to the calculation of the neutrino flux of the K2K experiment. After cuts, 210000 secondary tracks reconstructed in the forward spectrometer were used in this analysis. The results are given for secondaries within a momentum range from 0.75 GeV/c to 6.5 GeV/c, and within an angular range from 30 mrad to 210 mrad. The absolute normalization was performed using prescaled beam triggers counting protons on target. The overall scale of the cross-section is known to better than 6%, while the average point-to-point error is 8.2%.A precision measurement of the double-differential production cross-section, d 2 σ π + / d p d Ω , for pions of positive charge, performed in the HARP experiment is presented. The incident particles are protons of 12.9 GeV / c momentum impinging on an aluminium target of 5% nuclear interaction length. The measurement of this cross-section has a direct application to the calculation of the neutrino flux of the K2K experiment. After cuts, 210 000 secondary tracks reconstructed in the forward spectrometer were used in this analysis. The results are given for secondaries within a momentum range from 0.75 to 6.5 GeV/ c , and within an angular range from 30 mrad to 210 mrad. The absolute normalization was performed using prescaled beam triggers counting protons on target. The overall scale of the cross-section is known to better than 6%, while the average point-to-point error is 8.2%.A precision measurement of the double-differential production cross-section, , for pions of positive charge, performed in the HARP experiment is presented. The incident particles are protons of 12.9 GeV/c momentum impinging on an aluminium target of 5% nuclear interaction length. The measurement of this cross-section has a direct application to the calculation of the neutrino flux of the K2K experiment. After cuts, 210000 secondary tracks reconstructed in the forward spectrometer were used in this analysis. The results are given for secondaries within a momentum range from 0.75 GeV/c to 6.5 GeV/c, and within an angular range from 30 mrad to 210 mrad. The absolute normalization was performed using prescaled beam triggers counting protons on target. The overall scale of the cross-section is known to better than 6%, while the average point-to-point error is 8.2%
Measurement of the production cross-section of positive pions in the collision of 8.9 GeV/c protons on beryllium
No full textThe double-differential production cross-section of positive pions, d 2σπ+/d pdΩ, measured in the HARP experiment is presented. The incident particles are 8.9 GeV/c protons directed onto a beryllium target with a thickness of 5% of a nuclear interaction length. The measured cross-section has a direct impact on the prediction of neutrino fluxes for the MiniBooNE and SciBooNE experiments at Fermilab. After cuts, 13 million protons on target produced about 96000 reconstructed secondary tracks which were used in this analysis. Cross-section results are presented in the kinematic range 0.75∈GeV/c≤pπ≤ 6.5∈GeV/c and 30∈mrad≤θπ≤ 210∈mrad in the laboratory frame. © 2007 Springer-Verlag / Società Italiana di Fisica
Particle identification algorithms for the HARP forward spectrometer
No full textThe particle identification (PID) methods used for the calculation of secondary pion yields with the HARP forward spectrometer are presented. Information from time of flight and Cherenkov detectors is combined using likelihood techniques. The efficiencies and purities associated with the different PID selection criteria are obtained from the data. For the proton–aluminium interactions at 12.9 GeV/c incident momentum, the PID efficiencies for positive pions are 86% in the momentum range below 2 GeV/c, 92% between 2 and 3 GeV/c and 98% in the momentum range above 3 GeV/c. The purity of the selection is better than 92% for all momenta. Special emphasis has been put on understanding the main error sources. The final PID uncertainty on the pion yield is 3.3%
Proposal to study hadron production for the neutrino factory and for the atmospheric neutrino flux
No full text
The first precision drift tube chambers for the ATLAS muon spectrometer
No full textThe muon spectrometer of the ATLAS detector for the Large Hadron Collider is designed to provide a muon transverse momentum resolution of 2%-10% for momenta between 6 GeV and 1 TeV over a pseudo-rapidity range of |η|≤2.7. This required the development of precision drift chambers with a track position resolution of 40 μm, the Monitored Drift Tube (MDT) chambers. We report about the construction of the three main types of MDT chambers for ATLAS, test results and the first production experience. © 2002 Elsevier Science B.V. All rights reserved
Proposal for hadron production measurements using the NA49 detector for use in long-baseline and atmospheric neutrino flux calculations
No full textProposal to study helium-induced hadron production for the atmospheric neutrino flux: addendum to the HARP proposal
No full textEfecto en detección de neutrones térmicos por películas delgadas de grafeno dopado con boro y litio en Detectores GEM
No full textEste trabajo explora el uso de grafeno dopado con boro y litio como material convertidor para la detección de neutrones térmicos en detectores tipo GEM. Se sintetizaron y caracterizaron películas delgadas con distintas configuraciones de dopaje, evaluando su respuesta ante radiación mediante pruebas experimentales con fuente 241 Am-Be y simulaciones en Geant4. Los resultados muestran una mejora en la eficiencia de conversión, especialmente en las muestras con boro, y evidencian el potencial del material para futuras aplicaciones en instrumentación nuclear.Este trabajo presenta un estudio sobre el efecto del dopaje de grafeno con boro y litio en la detección de partículas, con miras a su posible aplicación en detectores GEM (Gas Electron Multiplier). Se sintetizaron películas delgadas de grafeno con distintos dopantes, utilizando métodos de exfoliación electroquímica e intercalación solvotermal, y se caracterizaron mediante espectroscopía Raman, FTIR, UV-Vis y microscopía electrónica de barrido (SEM), confirmando la incorporación efectiva de los dopantes y la modificación estructural del material.
A nivel experimental, se evaluó la respuesta de las películas dopadas ante radiación proveniente de una fuente moderada de 241Am-Be, observándose un aumento en los conteos de partículas en algunas muestras, especialmente en aquellas dopadas con boro. Los resultados fueron complementados con simulaciones en Geant4, que modelaron la interacción de neutrones térmicos con las películas y revelaron una producción significativa de partículas α en los materiales dopados, alcanzando eficiencias de hasta 3,1 % en las configuraciones más favorables.
Los hallazgos sugieren que el dopaje con boro y litio mejora la capacidad del grafeno para actuar como convertidor de neutrones térmicos, constituyendo una base sólida para su futura integración en detectores GEM. Se proponen recomendaciones para continuar la investigación mediante simulaciones más complejas y una caracterización cuantitativa del dopaje.Pregrad
