The Majorana project Elliott, Steven Ray; Elliott, Steve; Gehman, V M ...
01/2008, Letnik:
173
Conference Proceeding
Recenzirano
Odprti dostop
Building a 0{nu}{beta}{beta} experiment with the ability to probe neutrino mass in the inverted hierarchy region requires the combination of a large detector mass sensitive to 0{nu}{beta}{beta}, on ...the order of 1 ton, and unprecedented background levels, on the order of or less than 1 count per year in the 0{nu}{beta}{beta} signal region. The MAJORANA Collaboration proposes a design based on using high-purity enriched {sup 76}Ge crystals deployed in ultra-low background electroformed Cu cryostats and using modern analysis techniques that should be capable of reaching the required sensitivity while also being scalable to a 1-ton size. To demonstrate feasibility, the collaboration plans to construct a prototype system, the MAJORANA Demonstrator, consisting of 30 kg of 86% enriched {sup 76}Ge detectors and 30 kg of natural or isotope-76-depleted Ge detectors. We plan to deploy and evaluate two different Ge detector technologies, one based on a p-type configuration and the other on n-type.
The change in species composition from E. obliqua to about equal proportions of E. dives and E. radiata is associated with high overwood densities, favouring the establishment and development of the ...more shade tolerant and persistent peppermints. Regeneration of messmate, the preferred timber species, requires lower levels of overwood competition in association with adequate seedbed and seed supply.
Reduction in basal area increment of Eucalyptus obliqua following crown scorch [fire effects] Kellas, J.D; Squire, R.O. (Victorian Dept. of Conservation, Forests and Lands, Creswick (Australia)); Incoll, W.D. (Victorian Dept. of Conservation, Forests and Lands, Sherbrooke (Australia). Mountain Forest Research Station)
Australian forestry,
(1984), Letnik:
47, Številka:
3
Journal Article
Nucl.Instrum.Meth. A425 (1999) 480-489 The 8.4 Tesla, 10 m long transverse magnetic field of a twin aperture LHC
bending magnet can be utilized as a macroscopic coherent solar axion-to-photon
...converter. Numerical calculations show that the integrated time of alignment
with the Sun would be 33 days per year with the magnet on a tracking table
capable of $\pm 5^o$ in the vertical direction and $\pm 40^o$ in the horizontal
direction. The existing lower bound on the axion-to-photon coupling constant
can be improved by a factor between 50 and 100 in 3 years, i.e.,
$g_{a\gamma\gamma} \lesssim 9\cdot 10^{-11} GeV^{-1}$ for axion masses
$\lesssim$ 1 eV. This value falls within the existing open axion mass window.
The same set-up can simultaneously search for low- and high-energy celestial
axions, or axion-like particles, scanning the sky as the Earth rotates and
orbits the Sun.
The 8.4 Tesla, 10 m long transverse magnetic field of a twin aperture LHC bending magnet can be utilized as a macroscopic coherent solar axion-to-photon converter. Numerical calculations show that ...the integrated time of alignment with the Sun would be 33 days per year with the magnet on a tracking table capable of \(\pm 5^o\) in the vertical direction and \(\pm 40^o\) in the horizontal direction. The existing lower bound on the axion-to-photon coupling constant can be improved by a factor between 50 and 100 in 3 years, i.e., \(g_{a\gamma\gamma} \lesssim 9\cdot 10^{-11} GeV^{-1}\) for axion masses \(\lesssim\) 1 eV. This value falls within the existing open axion mass window. The same set-up can simultaneously search for low- and high-energy celestial axions, or axion-like particles, scanning the sky as the Earth rotates and orbits the Sun.
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