163 research outputs found
GENIUS - A New Underground Observatory for Non-Accelerator Particle Physics
The GENIUS (Germanium in Liquid Nitrogen Underground Setup) project has been
proposed in 1997 [KK-BEY97] as first third generation double beta decay
project, with a sensitivity aiming down to a level of an effective neutrino
mass of < 0.01eV or less. Such sensitivity is important to fix the
structure of the neutrino mass matrix with high accuracy, which cannot be done
by neutrino oscillation experiments alone. GENIUS will allow broad access also
to many other topics of physics beyond the Standard Model of particle physics
at the multi-TeV scale. For search of cold dark matter GENIUS will cover a
large part of the parameter space of predictions of SUSY for neutralinos as
dark matter [Bed-KK2,Ell,KK-LowNu2]. Finally, GENIUS has the potential to be a
real-time detector for low-energy (pp and 7{Be}) solar neutrinos
[Bau-KK,KK-LowNu2]. A GENIUS-Test Facility has just been funded and will come
into operation by end of 2002.Comment: 5 pages, revtex, 6 figures,Talk was presented at International
Workshop on Topics in Astroparticle and Underground Physics (TAUP 2001),
Date: September 8 - 12, 2001, Location: Laboratori Nazionali del Gran Sasso,
Italy, publ. in Nucl. Phys. B (Proc. Suppl.) (2002), eds. A. Bettini et al.,
Conference Info - Home Page: http://taup2001.lngs.infn.it/lucidi/h1.htm, Home
Page of Heidelberg Non-Accelerator Particle Physics Group:
http://www.mpi-hd.mpg.de/non_acc/Talks.htm
85Kr and 39Ar background in GENIUS
GENIUS is a proposal for a large scale detector of rare events like double
beta decay, cold dark matter and low-energy solar neutrinos in real time. The
idea of GENIUS is to operate a large amount of ``naked'' Ge detectors in liquid
nitrogen, with the aim of reducing the background down to a level of 10^(-3)
counts/kg keV y. In this work we investigate the contribution to the background
of GENIUS coming from argon (39Ar) and krypton (85Kr) contamination in the
liquid nitrogen.Comment: In press, Nuclear Instruments and Methods in Physics Research Section
A: Accelerators, Spectrometers, Detectors and Associated Equipment (2003
A digital multi-channel spectroscopy system with 100 MHz flash ADC module for the GENIUS-TF and GENIUS projects
In this paper we will present the first results of applying a digital
processing technology in low-level gamma spectroscopy with HPGE detectors. An
experimental gamma spectrometer using Flash ADC module is built and tested. The
test system is now under development and shows major advantages over the
traditional analog technologies. It will be installed for the GENIUS-TF and
GENIUS projects in Gran-Sasso in early 2003.Comment: 8 pages, latex, 6 figures, Published in NIM, Volume 498, Issues 1-3,
Pages 334-339, also see Home Page of Heidelberg Non-Accelerator Particle
Physics Group: http://www.mpi-hd.mpg.de/non_acc
Neutrino Mass from Laboratory: Contribution of Double Beta Decay to the Neutrino Mass Matrix
Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with oscillation experiments. The most sensitive
experiment - since eight years the HEIDELBERG-MOSCOW experiment in Gran-Sasso -
already now, with the experimental limit of eV practically
excludes degenerate mass scenarios allowing neutrinos as hot dark matter
in the universe for the smallangle MSW solution of the solar neutrino problem.
It probes cosmological models including hot dark matter already now on the
level of future satellite experiments MAP and PLANCK. It further probes many
topics of beyond SM physics at the TeV scale. Future experiments should give
access to the multi-TeV range and complement on many ways the search for new
physics at future colliders like LHC and NLC. For neutrino physics some of them
(GENIUS) will allow to test almost all neutrino mass scenarios allowed by the
present neutrino oscillation experiments.Comment: 5 pages, revtex, 6 figures, Talk was presented at International
Europhysics Neutrino Oscillation Workshop, Conca Specchiulla (Otranto,
Italy), September 9-16, 2000, to be published in Nucl. Phys. B (2001), Home
Page of Heidelberg-Moscow Experiment: http://www.mpi-hd.mpg.de/non_acc
First 10 kg of Naked Germanium Detectors in Liquid Nitrogen installed in the GENIUS-Test-Facility
The first four naked high purity Germanium detectors were installed
successfully in liquid nitrogen in the GENIUS-Test-Facility (GENIUS-TF) in the
GRAN SASSO Underground Laboratory on May 5, 2003. This is the first time ever
that this novel technique aiming at extreme background reduction in search for
rare decays is going to be tested underground. First operational parameters are
presented.Comment: 10 pages, latex2e, 8 figures, Was presented (first presentation) at
4th International Conference on Particle Physics Beyond the Standard Model
BEYOND'2003, Castle Ringberg, Germany, 9-14 June, 2003, Springer, Heidelberg,
Germany, 2003, edited by H.V. Klapdor-Kleingrothau
Search for Dark Matter by GENIUS-TF and GENIUS
The new project GENIUS will cover a wide range of the parameter space of
predictions of SUSY for neutralinos as cold dark matter. Together with DAMA it
will be the only experiment which can probe the seasonal modulation signal.
Concerning hot dark matter GENIUS will be able to fix the (effective) neutrino
mass with high accuracy. A GENIUS Test Facility has just been funded and will
come into operation by end of 2002.Comment: 3 pages, revtex, 2 figures, Talk was presented at International
Workshop on Topics in Astroparticle and Underground Physics (TAUP 2001),
September 8 - 12, 2001, Laboratori Nazionali del Gran Sasso, Italy, publ. in
Nucl. Phys. B (Proc. Suppl.) (2002), eds. A. Bettini et al., Conference Info
- Home Page: http://taup2001.lngs.infn.it/lucidi/b2/b2.pdf, Home Page of
Heidlberg Non-Accelerator Particle Physics Group:
http://www.mpi-hd.mpg.de/non_acc/Talks.htm
Measurement of the 214Bi spectrum in the energy region around the Q-value of 76Ge neutrinoless double-beta decay
In this work we present the results obtained measuring the 214Bi spectrum
from a 226Ra source with a high purity germanium detector. Our attention was
mostly focused on the energy region around the Q-value of 76Ge neutrinoless
double-beta decay (2039.006 keV). The results of this measurement are strongly
related to the first indication for the neutrinoless double beta decay of 76Ge,
given by a recent analysis \cite{Evidence,KK02-PN,KK02-Found,KK-BigArt02} of
the data collected during ten years of measurements from the HEIDELBERG-MOSCOW
experiment.Comment: 10 pages, latex2e, 5 figures, see also Home Page of HEIDELBERG
Non-Accelerator Particle Physics Group: http://www.mpi-hd.mpg.de/non_acc
Confronting Dilaton-exchange gravity with experiments
We study the experimental constraints on theories, where the equivalence
principle is violated by dilaton-exchange contributions to the usual
graviton-exchange gravity. We point out that in this case it is not possible to
have any CPT violation and hence there is no constraint from the CPT violating
measurements in the system. The most stringent bound is obtained from the
mass difference. In contrast, neither neutrino oscillation
experiments nor neutrinoless double beta decay imply significant constraints.Comment: 7 page
A superformula for neutrinoless double beta decay II: The short range part
A general Lorentz-invariant parameterization for the short-range part of the
0vBB decay rate is derived. Combined with the long range part already published
this general parameterization in terms of effective B-L violating couplings
allows one to extract the 0vBB limits on arbitrary lepton number violating
theories.Comment: 8 pages, LaTeX, 2 figure
Support of Evidence for Neutrinoless Double Beta Decay
Indirect support for the evidence of neutrinoless double beta decay reported
recently, is obtained by analysis of other Ge double beta experiments, which
yield independent information on the background in the region of Q_(beta-beta).
Some statistical features as well as background simulations with GEANT 4 of the
HEIDELBERG-MOSCOW experiment are discussed which disprove recent criticism.Comment: 15 pages, latex2e, 13 figure
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