New Results on the Basic Properties of Superheated Granules Detectors

First results with the ORPHEUS dark matter detector

“…A.1). The sensitivity of SSG detectors to minimumionising particles [19], X rays [20], and α particles [21,22] has been proved in past experiments. The response of SSG devices to nuclear recoil energies down to 1 keV has been explored irradiating SSG granules with a 70 MeV neutron beam [23].…”

Threshold Effects and Lorentz Symmetry

“…These events, besides challenging our knowledge of mechanisms that allow accelerating cosmic particles to such high energies, may imply in a violation of Lorentz invariance as only through this violation that new threshold effects may arise and the resonant scattering reactions with photons of the Cosmic Microwave Background (CMB), e.g. p + γ 2.73K → ∆ 1232 , are suppressed [6,7,8,9]. An astrophysical solution to this paradox is possible and imply identifying viable sources at distances within, D Source ∼ < 50 − 100 M pc [10,11], so that the travelling time of the emitted particles is shorter than the attenuation time due to particle photoproduction on the CMB.…”

Cryogenic detectors of particles: hopes and challenges

“…c) The device could be made insensitive to minimum ionization deposition. This may be interesting for transition radiation [21].…”

“…admittedly crude, methods, a large number of granules seem to be insensitive, leading to low overall quantum efficiency even though high efficiency has been claimed for the sensitive grains [23]. But rapid progress in manufacturing and packaging is claimed by some of the groups involved [21].…”

“…a) Manufacturing of regular enough spheres [21]. In addition to the obvious dependence of the heat capacity of spheres on the cube of their radius, there may be variation of sensitivity due to the internal structure and the orientation of the grains [22].…”