The measurement of the direction of WIMP-induced nuclear recoils is a
compelling but technologically challenging strategy to provide an unambiguous
signature of the detection of Galactic dark matter. Most directional detectors
aim to reconstruct the dark-matter-induced nuclear recoil tracks, either in gas
or solid targets. The main challenge with directional detection is the need for
high spatial resolution over large volumes, which puts strong requirements on
the readout technologies. In this paper we review the various detector readout
technologies used by directional detectors. In particular, we summarize the
challenges, advantages and drawbacks of each approach, and discuss future
prospects for these technologies.Comment: 58 pages, 26 figures, accepted by Physics Report
The gamma strength function and level density of 1^{-} states in ^{96}Mo have been extracted from a high-resolution study of the (p[over →], p[over →]^{'}) reaction at 295 MeV and extreme forward angles. By comparison with compound nucleus γ decay experiments, this allows a test of the generalized Brink-Axel hypothesis in the energy region of the pygmy dipole resonance. The Brink-Axel hypothesis is commonly assumed in astrophysical reaction network calculations and states that the gamma strength function in nuclei is independent of the structure of the initial and final state. The present results validate the Brink-Axel hypothesis for ^{96}Mo and provide independent confirmation of the methods used to separate gamma strength function and level density in γ decay experiments.
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