1,742 research outputs found
Radiation effects on silicon Fourth quarterly progress report, Sep. 25 - Dec. 31, 1965
Radiation effects in silicon solar cell
Radiation effects on silicon Final report, Jun. 1, 1964 - May 31, 1965
Radiation effects on silicon - degradation of carrier lifetime in N and P type silicon samples exposed to 30 MeV electron irradiatio
Probing the structure of the cold dark matter halo with ancient mica
Mica can store (for >1 Gy) etchable tracks caused by atoms recoiling from
WIMPs. Ancient mica is a directional detector despite the complex motions it
makes with respect to the WIMP "wind". We can exploit the properties of
directionality and long integration time to probe for structure in the dark
matter halo of our galaxy. We compute a sample of possible signals in mica for
a plausible model of halo structure.Comment: 7 pages, 2 figure
Radiation effects on silicon third quarterly progress report, dec. 1, 1964 - feb. 28, 1965
Radiation effect on silicon - introduction rates of vacancy-phosphorus defect and divacancy in p-type material for solar cell applicatio
Radiation effects on silicon second quarterly progress report, sep. 1 - nov. 30, 1964
Electron spin resonance measurements on P-doped silicon - vacancy phosphorus defec
Comments on "Limits on Dark Matter Using Ancient Mica"
To appear in Phys. Rev. Lett. together with the author's Reply.Comment: Compressed PostScript (filename.ps.Z), 3 pages, no figure
Simulations of the Nuclear Recoil Head-Tail Signature in Gases Relevant to Directional Dark Matter Searches
We present the first detailed simulations of the head-tail effect relevant to
directional Dark Matter searches. Investigations of the location of the
majority of the ionization charge as being either at the beginning half (tail)
or at the end half (head) of the nuclear recoil track were performed for carbon
and sulphur recoils in 40 Torr negative ion carbon disulfide and for fluorine
recoils in 100 Torr carbon tetrafluoride. The SRIM simulation program was used,
together with a purpose-written Monte Carlo generator, to model production of
ionizing pairs, diffusion and basic readout geometries relevant to potential
real detector scenarios, such as under development for the DRIFT experiment.
The results clearly indicate the existence of a head-tail track asymmetry but
with a magnitude critically influenced by two competing factors: the nature of
the stopping power and details of the range straggling. The former tends to
result in the tail being greater than the head and the latter the reverse.Comment: 22 pages, 12 figures, submitted to Astroparticle Physic
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