807 research outputs found
Virtual depth by active background suppression: Revisiting the cosmic muon induced background of GERDA Phase II
In-situ production of long-lived isotopes by cosmic muon interactions may
generate a non-negligible background for deep underground rare event searches.
Previous Monte Carlo studies for the GERDA experiment at LNGS identified the
delayed decays of Ge and its metastable state Ge as dominant
cosmogenic background in the search for neutrinoless double beta decay of
Ge. This might limit the sensitivity of next generation experiments
aiming for increased Ge mass at background-free conditions and thereby
define a minimum depth requirement. A re-evaluation of the Ge
background for the GERDA experiment has been carried out by a set of Monte
Carlo simulations. The obtained Ge production rate is (0.210.01)
nuclei/(kgyr). After application of state-of-the-art active background
suppression techniques and simple delayed coincidence cuts this corresponds to
a background contribution of (2.70.3)
cts/(keVkgyr). The suppression achieved by this strategy equals
an effective muon flux reduction of more than one order of magnitude. This
virtual depth increase opens the way for next generation rare event searches.Comment: 9 pages, 5 figure
LArGe: Background suppression using liquid argon (LAr) scintillation for 0 decay search with enriched germanium (Ge) detectors
Measurements with a bare p-type high purity germanium diode (HPGe) submerged
in a 19 kg liquid argon (LAr) scintillation detector at MPIK Heidelberg are
reported. The liquid argon--germanium system (LArGe) is operated as a 4
anti-Compton spectrometer to suppress backgrounds in the HPGe. This R&D is
carried out in the framework of the GERDA experiment which searches for
0 decays with HPGe detectors enriched in Ge. The goal of
this work is to develop a novel method to discriminate backgrounds in
0 search which would ultimately allow to investigate the
effective neutrino mass free of background events down to the inverse mass
hierarchy scale. Other applications in low-background counting are expected.Comment: 3 pages, 6 figures, conference proceedings of the 10th Topical
Seminar on Innovative Particle and Radiation Detectors (IPRD06) 1 - 5 October
2006 Siena, Ital
KriminalitÀt und Devianz in den "Berliner AbendblÀttern"
Die "Berliner AbendblÀtter", das kurzfristige Zeitungsprojekt Heinrich von Kleists (1810/11), erhielten besondere AttraktivitÀt durch Nachrichten und Darstellungen zum aktuellen Kriminalgeschehen. Mit seinen Texten zu diesem Gegenstandsbereich konnte sich Kleist vielfach auf die Polizei-Rapporte des Berliner Polizei-PrÀsidiums beziehen. Welche Strategien er dabei verfolgt, wird mit dem Beitrag erschlossen
Solar and Reactor Neutrinos: Upcoming Experiments and Future Projects
Sub-MeV solar neutrino experiments and long-baseline reactor oscillation
experiments toe the cutting edge of neutrino research. The upcoming experiments
KamLAND and BOREXINO, currently in their startup and final construction phase
respectively, will provide essential information on neutrino properties as well
as on solar physics. Future projects, at present under development, will
measure the primary solar neutrino fluxes via electron scattering and neutrino
capture in real time. High precision data for lepton mixing as well as for
stellar evolution theory will become available in the future. This paper aims
to give an overview of the upcoming experiments and of the projects under
development.Comment: 11 pages, 14 figures, LATEX (espcrc2.sty). Contribution to the
proceedings of "TAUP2001 - Topics in Astroparticle and Underground Physics",
LNGS, Italy (September 8-12, 2001
Theorie der (literarischen) Satire:Ein funktionales Modell zur Beschreibung von Textstruktur und kommunikativer Wirkung
Das entworfene Modell der literarischen Satire geht davon aus, dass satirische Kommunikation innerhalb der institutionalisierten Handlungen literarischer Kommunikation durch eine besondere Funktionalisierung von textuellem System und auĂertextuellen BezĂŒgen gekennzeichnet ist, die fĂŒr die Textstruktur Relevanz hat. Der Beitrag verfolgt dabei auch ein theorie- und fachgeschichtliches Ziel und dokumentiert, wie in den spĂ€ten 1960er und im Laufe der 1970er Jahre in der deutschsprachigen Literaturwissenschaft fĂŒr den Gegenstandsbereich âșTheorie und Geschichte der Satireâč der Anschluss an die internationale Diskussion hergestellt wurde
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