Speaker
Ms
Diana Carolina Herrera Muñoz
(University of Zaragoza)
Description
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)
Co-authors
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))
