Observation of two-neutrino double electron capture in 124Xe with XENON1T

@article{AprileAalbersAgostiniAlfonsiAlthueserAmaroAn2,
  title={Observation of two-neutrino double electron capture in 124Xe with XENON1T},
  author={E. J. F. M. L. F. D. M. V. C. F. L. B. M. L. T. P. A. Aprile Aalbers Agostini Alfonsi Althueser Amaro An and Elena Aprile and J. Aalbers and F. Agostini and Matteo Alfonsi and L. Althueser and Fernando Domingues Amaro and Matthew Anthony and Vasile Cristian Antochi and Francesco Arneodo and L. Baudis and Boris Bauermeister and Mohamed Lotfi Benabderrahmane and Thomas Berger and Pieter A Breur and A. M. Brown and A. M. Brown and Ethan Brown and S. Bruenner and Gianmarco Bruno and Ranny Budnik and Chiara Capelli and Jo{\~a}o M. R. Cardoso and Dominick Cichon and Daniel Coderre and Auke-Pieter Colijn and Jan Conrad and J. P. Cussonneau and M. P. Decowski and Patrick de Perio and Pietro Di Gangi and Adriano Di Giovanni and Sara Diglio and A. Elykov and Guillaume Eurin and Jia Fei and Alfredo D. Ferella and Alexander Fieguth and Walter Fulgione and Andrea Gallo Rosso and Michelle Galloway and F. Gao and Marco Garbini and Luca Grandi and Zachary Greene and Constanze Hasterok and Erik J. Hogenbirk and Joseph Howlett and Michele Iacovacci and Ran Itay and F. Joerg and Basho Kaminsky and Shingo Kazama and Alexander Kish and G. Koltman and Abigail Kopec and Hagar Landsman and Rafael F. Lang and Lorne Levinson and Q. Lin and Sebastian Lindemann and Manfred Lindner and Francesco Lombardi and Jos{\'e} A. M. Lopes and Ernesto L{\'o}pez Fune and Carla Macolino and J. Mahlstedt and Alessandro Manfredini and Fabrizio Marignetti and Teresa Marrod'an Undagoitia and Julien Masbou and Darryl Masson and Stefano Mastroianni and Marcello Messina and K. Micheneau and K. Miller and Andrea Molinario and Knut Dundas Mora and Michael Murra and Junji Naganoma and Kaixiang Ni and Uwe G. Oberlack and Kelly Odgers and Bart Pelssers and R. Peres and Francesco Piastra and Jacques L. Pienaar and V. Pizzella and Guillaume Plante and R. B. Podviianiuk and Nadav Priel and Hao Qiu and D. Ram{\'i}rez Garc{\'i}a and Shayne Reichard and Benedikt Riedel and Alfio Rizzo and A. Rocchetti and Natascha Rupp and Joaquim Marques Ferreira dos Santos and Gabriella Sartorelli and N. {\vS}ar{\vc}evi{\'c} and M. Scheibelhut and Sabine Schindler and Jochen Schreiner and Daniel Schulte and Marc Schumann and Luca Scotto Lavina and Marco Selvi and Peter Shagin and Evan Shockley and M. Silva and Hardy Simgen and C. Therreau and D. Thers and Francesco Toschi and G. C. Trinchero and Christopher Tunnell and N. Upole and M. A. Vargas and Oskar K. Wack and H. G. Wang and Z. Wang and Y. Wei and Christian Weinheimer and Daniel Wenz and Christian Wittweg and Julien Wulf and J. Ye and Y. Zhang and T. Zhu and J. P. Zopounidis},
  journal={Nature},
  year={2019},
  volume={568},
  pages={532 - 535}
}
Two-neutrino double electron capture (2νECEC) is a second-order weak-interaction process with a predicted half-life that surpasses the age of the Universe by many orders of magnitude1. Until now, indications of 2νECEC decays have only been seen for two isotopes2–5, 78Kr and 130Ba, and instruments with very low background levels are needed to detect them directly with high statistical significance6,7. The 2νECEC half-life is an important observable for nuclear structure models8–14 and its… 
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Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For Xe124 this process has not yet been observed and its detection
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The possibility of observing the neutrinoless double {beta} decay and thus proving the Majorana nature of neutrinos as well as providing a sensitive measure of its mass is a major challenge of
Double beta decays of 124 Xe investigated in the QRPA framework
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The results of the experimental search for two-neutrino $2K$-capture in $^{124}$Xe with a large copper proportional counter obtained by processing the data for an exposure of 37.7 kg$\times$day are
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TLDR
A search for weakly interacting massive particles (WIMPs) using 278.8 days of data collected with the XENON1T experiment at LNGS finds no significant excess over background, and a profile likelihood analysis parametrized in spatial and energy dimensions excludes new parameter space for the WIMP-nucleon spin-independent elastic scatter cross section.
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