Measurement of the Spectral Shape of the beta-decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory

6533b872fe1ef96bd12d3902

RESEARCH PRODUCT

Measurement of the Spectral Shape of the beta-decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory

S. Al Kharusi G. Anton I. Badhrees P. S. Barbeau D. Beck V. Belov T. Bhatta M. Breidenbach T. Brunner G. F. Cao W. R. Cen C. Chambers B. Cleveland M. Coon A. Craycraft T. Daniels L. Darroch S. J. Daugherty J. Davis S. Delaquis A. Der Mesrobian-kabakian R. Devoe J. Dilling A. Dolgolenko M. J. Dolinski J. Echevers W. Fairbank D. Fairbank J. Farine S. Feyzbakhsh P. Fierlinger D. Fudenberg P. Gautam R. Gornea G. Gratta C. Hall E. V. Hansen J. Hoessl P. Hufschmidt M. Hughes A. Iverson A. Jamil C. Jessiman M. J. Jewell A. Johnson A. Karelin L. J. Kaufman T. Koffas J. Kostensalo R. Kr��cken A. Kuchenkov K. S. Kumar Y. Lan A. Larson B. G. Lenardo D. S. Leonard G. S. Li S. Li Z. Li C. Licciardi Y. H. Lin R. Maclellan T. Mcelroy T. Michel B. Mong D. C. Moore K. Murray P. Nakarmi O. Njoya O. Nusair A. Odian I. Ostrovskiy A. Piepke A. Pocar F. Reti��re A. L. Robinson P. C. Rowson D. Ruddell J. Runge S. Schmidt D. Sinclair K. Skarpaas A. K. Soma V. Stekhanov J. Suhonen M. Tarka S. Thibado J. Todd T. Tolba T. I. Totev R. Tsang B. Veenstra V. Veeraraghavan P. Vogel J. -L. Vuilleumier M. Wagenpfeil J. Watkins M. Weber L. J. Wen U. Wichoski G. Wrede S. X. Wu Q. Xia D. R. Yahne L. Yang Y. -R. Yen O. Ya. Zeldovich T. Ziegler

subject

Nuclear Theory (nucl-th)Nuclear Theory FOS: Physical sciences Nuclear Experiment (nucl-ex)Nuclear Experiment

description

We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden non-unique $\beta$-decay transition $^{137}\textrm{Xe}(7/2^-)\to\,^{137}\textrm{Cs}(7/2^+)$. The experimental data were acquired by the EXO-200 experiment during a deployment of an AmBe neutron source. The ultra-low background environment of EXO-200, together with dedicated source deployment and analysis procedures, allowed for collection of a pure sample of the decays, with an estimated signal-to-background ratio of more than 99-to-1 in the energy range from 1075 to 4175 keV. In addition to providing a rare and accurate measurement of the first-forbidden non-unique $\beta$-decay shape, this work constitutes a novel test of the calculated electron spectral shapes in the context of the reactor antineutrino anomaly and spectral bump.

year	journal	country	edition	language
2020-01-31

10.1103/physrevlett.124.232502 http://arxiv.org/abs/2002.00108