[APEX] a low energy dark matter experiment

[Jay Benesch]

interesting arxiv posting.  SLAC may have enough stuff lying around to 
set this up.  15 MeV electron source needed, but those are commercially 
available if SLAC has cleaned out the attic.

https://arxiv.org/abs/1807.04604

Electrodisintegration of Deuteron into Dark Matter and Proton Close to 
Threshold
A. N. Ivanov, R. Höllwieser, N. I. Troitskaya, M. Wellenzohn, Ya. A. 
Berdnikov
(Submitted on 12 Jul 2018)

     We discuss an investigation of the dark matter decay modes of the 
neutron, proposed by Fornal and Grinstein (Phys. Rev. Lett. 120 191801 
(2018)) and Ivanov et al. ( arXiv:1806.10107 [hep-ph]) for solution of 
the neutron lifetime anomaly problem, through the analysis of the 
electrodisintegration of the deuteron d into dark matter fermions chi 
and protons p close to threshold. We calculate the triple-differential 
cross section for the reaction e^- + d ->\chi + p + e^- and propose to 
search for such a dark matter channel in coincidence experiments on the 
electrodisintegration of the deuteron e^- + d -> n + p + e^- into 
neutrons n and protons close to threshold with outgoing electrons, 
protons and neutrons in coincidence. A missing of neutron signals should 
testify a detection of dark matter fermions.

Comments: 	6 pages, no figures