[APEX] a low energy dark matter experiment

[Pete E.C. Markowitz]

I am not sure Bogdan.  I think if you put a tank of hydrogen (gas? 
probably) there to detect the neutrons, np scattering cross sections are 
pretty well known in the MeV region.  And TUNL could also be used to 
measure the efficiency for such a detector, couldn't it?

On 7/13/18 11:45 AM, Bogdan Wojtsekhowski wrote:
> Detection of neutron at such energy has low and unreliable efficiency.
>
> ----- Original Message -----
> From: "Jay Benesch" <benesch at jlab.org>
> To: "Natalia Toro" <ntoro at slac.stanford.edu>, "apex" <apex at jlab.org>
> Sent: Friday, July 13, 2018 7:33:37 AM
> Subject: [APEX] a low energy dark matter experiment
>
> 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://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_1807.04604&d=DwIGaQ&c=lhMMI368wojMYNABHh1gQQ&r=GbQjY3Pcc5hOhorqJZdTwQ&m=xr8W1lbhD0_f0isqPVrDMqEHPGoUMAnVEv9kuu4L7EI&s=wDPEBLCbi5yhO_wNWZv4-aS3N0uzULIrWB7-vKoS348&e=
>
> 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
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-- 
Dr. Pete Markowitz
Professor of Physics and Fellow of the Honors College
11200 SW 8 Street
Miami, FL 33199