604 research outputs found
Mildly mixed coupled models vs. WMAP7 data
Mildly mixed coupled models include massive neutrinos and CDM--DE coupling.
We present new tests of their likelihood vs. recent data including WMAP7,
confirming it to exceed LCDM, although at ~2\sigma's. We then show the impact
on the physics of the dark components of neutrino mass detection in tritium
beta decay or neutrinoless double beta decay experiments.Comment: Proceedings of NOW2010, Conca Specchiulla, Italy, September 4-11,
201
Real-time digital signal processor implementation of self-calibrating pulse-shape discriminator for high purity germanium
Pulse-shape analysis of the ionization signals from germanium gamma-ray
spectrometers is a method for obtaining information that can characterize an
event beyond just the total energy deposited in the crystal. However, as
typically employed, this method is data-intensive requiring the digitization,
transfer, and recording of electronic signals from the spectrometer. A hardware
realization of a real-time digital signal processor for implementing a
parametric pulse shape is presented. Specifically, a previously developed
method for distinguishing between single-site and multi-site gamma-ray
interactions is demonstrated in an on-line digital signal processor, compared
with the original off-line pulse-shape analysis routine, and shown to have no
significant difference. Reduction of the amount of the recorded information per
event is shown to translate into higher duty-cycle data acquisition rates while
retaining the benefits of additional event characterization from pulse-shape
analysis.Comment: Accepted by NIM
Theory and Phenomenology of Neutrino Mixing
We review some fundamental aspects of the theory of neutrino masses and
mixing. The results of neutrino oscillation experiments are interpreted as
evidence of three-neutrino mixing. Implications for the mixing parameters and
the neutrino masses are discussed, with emphasis on the connection with the
measurements of the absolute values of neutrino masses in beta decay and
neutrinoless double-beta decay experiments and cosmological observations.Comment: 16 pages; talks presented at Tau06 (19-22 September 2006, Pisa,
Italy) and HQL06 (16-20 October 2006, Munich, Germany
Constraints from Neutrinoless Double Beta Decay
We examine the constraints from the recent HEIDELBERG-MOSCOW double beta
decay experiment. It leads us to the almost degenerate or inverse hierarchy
neutrino mass scenario. In this scenario, we obtain possible upper bounds for
the Majorana CP violating phase in the lepton sector by incorporating the data
from the neutrino oscillation, the single beta decay experiments, and from the
astrophysical observation. We also predict the neutrino mass that may be
measurable in the future beta decay experiments.Comment: 10 pages, 3 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
The Neutrinoless Double Beta Decay: The Case for Germanium Detectors
An overview of the current status of Neutrinoless Double Beta Decay is
presented, emphasizing on the case of Germanium Detectors.Comment: 5 figures, Invited contribution at the XXX International Meeting on
Fundamental Physics, IMFP2002, February 2002, Jaca, Spain. To appear in Nucl.
Phys. B (Proc. Suppl
Simulation of the Directional Dark Matter Detector (D3) and Directional Neutron Observer (DiNO)
Preliminary simulation and optimization studies of the Directional Dark
Matter Detector and the Directional Neutron Observer are presented. These
studies show that the neutron interaction with the gas-target in these
detectors is treated correctly by GEANT4 and that by lowering the pressure, the
sensitivity to low-mass WIMP candidates is increased. The use of negative ion
drift might allow us to search the WIMP mass region suggested by the results of
the non-directional experiments DAMA/LIBRA, CoGeNT and CRESST-II.Comment: Proceedings of the 3rd International conference on Directional
Detection of Dark Matter (CYGNUS 2011), Aussois, France, 8-10 June 201
A Full Determination of the Neutrino Mass Spectrum from Two-zero Textures of the Neutrino Mass Matrix
We show that it is possible to fully determine the neutrino mass spectrum
from two-zero textures of the neutrino mass matrix. As a consequence, definite
predictions can be obtained for the neutrinoless double beta decay.Comment: LaTex 8 pages. Modifications made. References added. Acknowledgments
change
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
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