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First search for Lorentz andCPTviolation in double beta decay with EXO-200
Albert, J. B.,Barbeau, P. S.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov, M.,Daugherty, S. J.,Davis, C. American Physical Society 2016 Physical Review D Vol.93 No.7
<P>A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of Xe-136 has been performed using an exposure of 100 kg . yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz -violation was found, and a two-sided limit of -2.65 x 10(-5) GeV < (a)(of),(,3r) < 7.60 x 10(-6) GeV (90% C.L.) is placed on the relevant coefficient within the Standard -Model Extension (SME). This is the first experimental study of the effect of the SME-defined oscillation -free and momentum-independent neutrino coupling operator on the double beta decay process.</P>
Search for2νββdecay ofXe136to the01+excited state ofBa136with the EXO-200 liquid xenon detector
Albert, J. B.,Auty, D. J.,Barbeau, P. S.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Chaves, J.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov, M.,Dau American Physical Society 2016 Physical Review C Vol.93 No.3
<P>EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless pp decay of Xe-136 to the ground state of Ba-136. We report here on a search for the two -neutrino pp decay of Xe-136 to the first 0+ excited state, 0(1)(+), of Ba-136 based on a 100 kg yr exposure of Xe-136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 x 10(24) yr. We find no statistically significant evidence for the 20P decay to the excited state resulting in a lower limit of Ti-1/2(7 nu) (0(+) -> 0(1)(+)) > 6.9 x10(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 x 10(25) yr.</P>
Investigation of radioactivity-induced backgrounds in EXO-200
Albert, J. B.,Auty, D. J.,Barbeau, P. S.,Beck, D.,Belov, V.,Benitez-Medina, C.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.1
Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay
Albert, J. B.,Anton, G.,Arnquist, I. J.,Badhrees, I.,Barbeau, P.,Beck, D.,Belov, V.,Bourque, F.,Brodsky, J. P.,Brown, E.,Brunner, T.,Burenkov, A.,Cao, G. F.,Cao, L.,Cen, W. R.,Chambers, C.,Charlebois, American Physical Society 2018 Physical Review C Vol.97 No.6