Etude d'un système de trajectographie Micromegas pour le spectromètre dimuon d'ALICE

ALICE (A Large Ion Collider Experiment) will be the only LHC (Large Hadron Collider) experiment dedicated to the study of ultra-relativistic heavy ion collisions at CERN. Related to the design of this detector at Subatech, an R and D program has been carried out on the ALICE dimuon spectrometer tracking chambers using Micromegas detectors. The first aim of this work was to study the performances of this kind of strip detector and to validate their integration feasibility in the spectrometer tracking system. Simulations of the tracking system have exhibit the necessity of an intrinsic two dimensional localization capability, leading to the development of resistive strips for these detectors. With an Ar/CO2 gas mixture and a gain of 104, laboratory and in-beam tests at PS (CERN) have given an efficiency better than 95 pc and an energy resolution of 20 pc. Perpendicular to the strips, a spatial resolution of 43 μm has been obtained using the charge barycentre reconstruction. Along the strip, the charge division of the avalanche signal at both ends of the resistive strips leads to a linear reconstruction of the impact position. Depending on the signal to noise ratio, 1.1 mm to 500 μm spatial resolutions have been obtained. (author

Benchmarking GEANT4 nuclear models for hadron therapy with 95 MeV/nucleon carbon ions

In carbon-therapy, the interaction of the incoming beam with human tissues may lead to the production of a large amount of nuclear fragments and secondary light particles. An accurate estimation of the biological dose deposited into the tumor and the surrounding healthy tissues thus requires sophisticated simulation tools based on nuclear reaction models. The validity of such models requires intensive comparisons with as many sets of experimental data as possible. Up to now, a rather limited set of double di erential carbon fragmentation cross sections have been measured in the energy range used in hadrontherapy (up to 400 MeV/A). However, new data have been recently obtained at intermediate energy (95 MeV/A). The aim of this work is to compare the reaction models embedded in the GEANT4 Monte Carlo toolkit with these new data. The strengths and weaknesses of each tested model, i.e. G4BinaryLightIonReaction, G4QMDReaction and INCL++, coupled to two di fferent de-excitation models, i.e. the generalized evaporation model and the Fermi break-up are discussed

A Century Recalled: Essays in Honor of Bryn Mawr College

Table of Contents A Century Recalled: Introduction, Patricia Hochschild Labalme In Appreciation, Eudora Welty A Renewal of Mind: The Centennial Convocation Heavenly and Earthly Wisdom: The Quaker Heritage of Bryn Mawr, Millicent Carey McIntosh Rise to these Responsibilities: Faculty Powers and How They Grew, Mabel L. Lang Desirable Elements: Refugee Professors at Bryn Mawr in the Thirties and Forties, Felix Gilbert To Leap, Katharine Houghton Hepburn Pledged to an Idea: An Experiment in Self-Governance, Anne Hobson Freeman Rite and Ritual: Traditions at Bryn Mawr, Francine du Plessix Gray Given Two Bridge-Builders, a Man, and a Woman: Feminism at Bryn Mawr, Patricia Hochschild Labalme More Steeply to the Heights: The Graduate School of Social Work and Social Research, Dolores Griffin Norton The Key to the Fields: The Classics at Bryn Mawr, Emily Townsend Vermeule Remarkable Participation: Some Beginnings in Science at Bryn Mawr, Jane M. Oppenheimer Reflections on Social Science as a Liberal—and Liberating—Art, Rosabeth Moss Kanter Far Beyond Bryn Mawr: The Inernational Network, Elizabeth Gray Vining Just Beyond Bryn Mawr: The Haverford Connection, Jonathan E. Rhoads Shadows of Dreams, Richmond Lattimorehttps://repository.brynmawr.edu/bmc_books/1027/thumbnail.jp

A Century Recalled: Essays in Honor of Bryn Mawr College

Table of Contents A Century Recalled: Introduction, Patricia Hochschild Labalme In Appreciation, Eudora Welty A Renewal of Mind: The Centennial Convocation Heavenly and Earthly Wisdom: The Quaker Heritage of Bryn Mawr, Millicent Carey McIntosh Rise to these Responsibilities: Faculty Powers and How They Grew, Mabel L. Lang Desirable Elements: Refugee Professors at Bryn Mawr in the Thirties and Forties, Felix Gilbert To Leap, Katharine Houghton Hepburn Pledged to an Idea: An Experiment in Self-Governance, Anne Hobson Freeman Rite and Ritual: Traditions at Bryn Mawr, Francine du Plessix Gray Given Two Bridge-Builders, a Man, and a Woman: Feminism at Bryn Mawr, Patricia Hochschild Labalme More Steeply to the Heights: The Graduate School of Social Work and Social Research, Dolores Griffin Norton The Key to the Fields: The Classics at Bryn Mawr, Emily Townsend Vermeule Remarkable Participation: Some Beginnings in Science at Bryn Mawr, Jane M. Oppenheimer Reflections on Social Science as a Liberal—and Liberating—Art, Rosabeth Moss Kanter Far Beyond Bryn Mawr: The Inernational Network, Elizabeth Gray Vining Just Beyond Bryn Mawr: The Haverford Connection, Jonathan E. Rhoads Shadows of Dreams, Richmond Lattimorehttps://repository.brynmawr.edu/bmc_books/1027/thumbnail.jp

Simulation study on light ions identification methods for carbon beams from 95 to 400 MeV/A

Monte Carlo simulations have been performed in order to evaluate the efficiencies of several light ions identification techniques. The detection system was composed with layers of scintillating material to measure either the deposited energy or the time-of-flight of ions produced by nuclear reactions between 12C projectiles and a PMMA target. Well known techniques such as (DELTA) E--Range, (DELTA) E--E--ToF and (DELTA)E--E are presented and their particle identification efficiencies are compared one to another regarding the generated charge and mass of the particle to be identified. The simulations allowed to change the beam energy matching the ones proposed in an hadron therapy facility, namely from 95 to 400 MeV/A

Cindré – Château de Puyfol

Préalablement à la réhabilitation du réseau d’assainissement du château de Puyfol, dans la commune de Cindré, un diagnostic archéologique a été réalisé par le Sapda du 9 au 12 août 2021. Cette opération a permis de sonder 110 m2 grâce à l’ouverture de deux sondages, soit 23 % de la superficie totale accessible, qui s’élevait à 470 m2 (fig. 1). La totalité de l’emprise n’était pas accessible à cause de la topographie du terrain. En effet, elle est cernée par le tureau calcaire du côté est..

Yzeure – La motte castrale de La Mouzière

Préalablement à la construction d’un hangar agricole au lieu-dit La Mouzière, dans la commune d’Yzeure, un diagnostic archéologique a été réalisé par le Sapda de l’Allier du 29 novembre au 2 décembre 2021. Cette opération a permis de sonder 461,20 m2 grâce à l’ouverture de trois sondages, soit 12,55 % de la superficie totale accessible, s’élevant à 3 674 m2 (fig. 1). La totalité de l’emprise n’a pas été prise en compte puisque seule cette petite partie était affectée par les travaux d’amé..

Bessay-sur-Allier – Zac de la Garde

Préalablement à la création d’une Zac au lieu-dit La Garde, dans la commune de Bessay-sur-Allier, un diagnostic archéologique a été réalisé par le Sapda du 15 au 23 mars 2021. Cette opération a permis de sonder 2 702,15 m2 grâce à l’ouverture de seize sondages (fig. 1), soit 8 % de la superficie totale qui s’élève à 33 750 m2. La totalité de l’emprise n’était pas accessible en raison, notamment, de la végétation qu’il était précisé de ne pas impacter.Fig. 1 – Plan général de l’implantatio..

Double di ffential fragmentation cross sections measurements of 95 MeV/u 12C on thin targets for hadrontherapy

During therapeutic treatment with heavy ions like carbon, the beam undergoes nuclear fragmentation and secondary light charged particles, in particular protons and alpha particles, are produced. To estimate the dose deposited into the tumors and the surrounding healthy tissues, an accurate prediction on the fluences of these secondary fragments is necessary. Nowadays, a very limited set of double di ffential carbon fragmentation cross sections are being measured in the energy range used in hadrontherapy (40 to 400 MeV/u). Therefore, new measurements are performed to determine the double di ffential cross section of carbon on di erent thin targets. This work describes the experimental results of an experiment performed on May 2011 at GANIL. The double di ffential cross sections and the angular distributions of secondary fragments produced in the 12C fragmentation at 95 MeV/u on thin targets (C, CH2, Al, Al2O3, Ti and PMMA) have been measured. The experimental setup will be precisely described, the systematic error study will be explained and all the experimental data will be presented.Comment: Submitted to PR

Zero degree measurements of 12C fragmentation at 95 MeV/nucleon on thin targets

During therapeutic treatments using ions such as carbon, nuclear interactions between the incident ions and nuclei present in organic tissues may occur, leading to the attenuation of the incident beam intensity and to the production of secondary light charged particles. As the biological dose deposited in the tumor and the surrounding healthy tissues depends on the beam composition, an accurate knowledge of the fragmentation processes is thus essential. In particular, the nuclear interaction models have to be validated using experimental double differential cross sections which are still very scarce. An experiment was realized in 2011 at GANIL to obtain these cross sections for a 95 MeV/nucleon carbon beam on different thin targets for angles raging from 4 to 43{\deg} . In order to complete these data, a new experiment was performed on September 2013 at GANIL to measure the fragmentation cross section at zero degree for a 95 MeV/nucleon carbon beam on thin targets. In this work, the experimental setup will be described, the analysis method detailed and the results presented