7,179 research outputs found
High-field (high-frequency) EPR spectroscopy and structural characterization of a novel manganese(III) corrole
The X-ray structure, magnetic susceptibility, and high-field (high-frequency) EPR spectrum of manganese 5,10,15-tris(pentafluorophenyl) corrole unambiguously establish that the complex contains an isolated, slightly rhombic, manganese(III) center
From dense-dilute duality to self duality in high energy evolution
I describe recent work on inclusion of Pomeron loops in the high energy
evolution. In particular I show that the complete eikonal high energy evolution
kernel must be selfdual.Comment: Talk given at DIS05, April 2005, Madiso
Implications of a solar-system population of massive 4th generation neutrinos for underground searches of monochromatic neutrino-annihilation signals
It has been recently pointed out that any primary galactic population of
Weakly Interacting Massive Particles (WIMP) generates, through collisions with
solar matter, a secondary population of ``slow'' WIMPs trapped in the inner
solar system. We show that taking into account this ``slow'' solar-system
population dramatically enhances the possibility to probe the existence of
stable massive neutrinos (of a 4th generation) in underground neutrino
experiments. Our work suggests that a reanalysis of existing underground
neutrino data should be able to bring extremely tight constraints on the
possible existence of a stable massive 4th neutrino.Comment: 15 pages, 4 figure
Galactic Gamma Halo by Heavy Neutrino annihilations?
The diffused gamma halo around our Galaxy recently discovered by EGRET could
be produced by annihilations of relic neutrinos N (of fourth generation), whose
mass is within a narrow range (Mz /2 < M < Mz). Neutrino annihilations in the
halo may lead to either ultrarelativistic electron pairs whose inverse Compton
Scattering on infrared or optical galactic photons could be the source of the
observed GeV gamma rays, or to prompt 100 MeV- 1 GeV photons (due to neutral
pion secondaries) born by N - anti N --> Z--> quark pairs reactions. The
consequent gamma flux (10 ^(-7)- 10^(-6) cm ^(-2) s^(-1) sr^(-1)) is well
comparable to the EGRET observed one and it is also compatible with the narrow
window of neutrino mass : 45 GeV < M < 50 GeV recently required to explain the
underground DAMA signals. The presence of heavy neutrinos of fourth generation
do not contribute much to solve the dark matter problem of the Universe, but it
may be easily detectable by outcoming LEP II data.Comment: 16 pages, Latex text,in press in Astroparticle Physics 199
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