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Study of Columnar Recombination in Xe+trymethilamine Mixtures using a Micromegas-TPC

6 Jun 2014, 12:00
Graanbeurszaal (Beurs van Berlage)


Beurs van Berlage

Oral Sensors: 1c) Gaseous Detectors I.c Gaseous


Ms Diana Carolina Herrera Muñoz (University of Zaragoza)


Electron-ion recombination is experimentally studied in Xe+trimethylamine mixtures, motivated by its potential use for directional dark matter searches. A time projection chamber of 2.4 l with a novel configuration formed by two symmetric drift regions with two microbulk-Micromegas readouts is used to measure the recombination of $\alpha$- and $\gamma$-particles, which are emitted in coincidence by an $^{241}$Am source. A gas mixture of 98\%Xe+2\%TMA is used, varying the pressure from 2 to 10 bar, and the reduced drift field within 10-400 V/cm/bar range. Both $\alpha$-and $\gamma$-particles exhibit recombination as the electric drift field decreases, being stronger for $\alpha$- particles. This is partially explained by columnar recombination due to the dependency observed with the track angle (relative to the direction of electric drift field). The comparison of the data with the theoretical models for recombination will be shown and discussed. These results support a suggestion that has been recently put forward on how to obtain a directional signal in the recoils induced by Dark Matter interactions with xenon-gas. In fact, there are already efforts trying to pursue directionality but with very low masses.

Primary author

Ms Diana Carolina Herrera Muñoz (University of Zaragoza)


Dr Azriel Goldschmidt (UC Berkeley /Lawrence Berkely National Lab) Carlos Alberto Bastos De Oliveira (Lawrence Berkeley National Lab, CA, USA) Diego Gonzalez Diaz (Universidad de Zaragoza (ES)) Francisco Jose Iguaz Gutierrez (Universidad de Zaragoza (ES)) Dr Gloria Luzon (Universidad de Zaragoza) Igor Garcia Irastorza (Universidad de Zaragoza (ES)) Joshua Renner (UC Berkeley / Lawrence Berkeley National Lab) Megan Long (L) Dr Susana Cebrian (Universidad de Zaragoza (ES)) Mr Theopisti Dafni (Universidad de Zaragoza (ES))

Presentation materials