OUR
FINAL
RESULTS 2006:
OUR
FINAL - SUPER
ARTICLES:
Nr. 1 - 6.4 SIGMA
RESULT !!
Nr. 2 - LESSONS after
EVIDENCE
Nr. 3 - Theoretical
Investigation ...
Nr. 4 - Microscopic
Calculations ...
Nr. 1: Please click here to print the pdf
file of
our NEW Article
- Modern Physics Letters A Vol. 21 (2006) 1547-1566:
"The pulse shape selected spectrum (selected
by neuronal net-NN) with detectors 2,3,4,5, from 1995 to 2003 in the energy
interval 2000-2100 keV. The signal at Qbeta-beta has a confidence
level of 6.4 sigma (7.05 +- 1.11 events)."
"The pulse shape selected spectrum (selected
by neuronal net-NN) with detectors 2,3,4,5, from 1995 to 2003 in the energy
interval 2000-2060 keV. The signal at Qbeta-beta has a confidence
level of 6.6, 7.2 and 6.7 sigma respectively for cutting boundary areas of
0(1)(2) mm are shown."
"Lines
from the neuronal net (NN) pulse shape selected spectrum measured 1995-2003 for
detectors 2,3,4,5, in the energy of some strong background lines. E.g. 2505.7
keV line originating from summation of the subsequent 1173.2 and 1332.5 keV
gamma-lines from 60Co naturally expected to be a multiple site event
is erased to 100% (please compare with pulse shape selected MSE spectrum, second
figure (rosa))."
Nr. 2: Please click here to print the pdf
file
of our LESSONS
Physics Scripta T 127 (2007) 40-42:
H.V. Klapdor-Kleingrothaus
-------- Abstract --------
This paper describes the lessons we have to draw
after the observation of neutrinoless beta-beta decay
by the enriched 76Ge experiment,
for present and future experiments
(a) to fulfill the task to confirm the present result
(b) to deliver additional information on the main contributions,
of effective neutrino mass and right-handed weak currents etc.
to the 0nu beta-beta amplitude.
It is pointed out that
presently running and planned experiments are
probably
not sensitive enough to check the present evidence on a reasonable time scale.
More important,
the only way to get more information on the individual contributions
of m, eta, lambda etc. to the 0nu beta-beta amplitude
is to go to completely different types of
experiments,
e.g. mixed-mode beta^+ EC decay experiments, such as 124Xe decay.
-------- Abstract --------
Nr. 3 : Here You will find another article -
pdf file of the new article
Phys. Rev D 73 (2006) 013010
H.V. Klapdor-Kleingrothaus, I.V. Krivosheina and I.V. Titkova
"Theoretical Investigation of the Dependence of
Double Beta Decay
Tracks in a Ge Detector on Particle and Nuclear Physics
Parameters and Separation from Gamma Ray Events"
-------- Abstract --------
The key to probe the existence of 0nu beta-beta decay
beyond
observation of a signal at the Q value of the process, Q
beta-beta, is
the discrimination of beta-beta events from background gamma events (or other
events), in almost
any double beta decay experiment (see Phys. Lett. B
586 (2004) 198 and NIMA 522 (2004) 371). In this paper Monte Carlo simulations
of neutrino-accompanied (2nu beta-beta) and neutrinoless double beta decay (0nu
beta-beta) events, and of various kinds of background processes such as multiple
and other gamma interactions are reported for a Ge detector. The time history of
the evolution of the individual events is followed and the sizes of the events (volumes
in the detector inside which the energy of the event is released) are
investigated. Effects of the angular correlations of the two electrons in
beta-beta decay, which again depend on nuclear and (for 0nu beta-beta decay) on
particle physics parameters, are taken into account and have been calculated for
this purporse for the first time on basis of the experimental half-life of
76Ge and of realistic nuclear matrix elements. The sizes determine,
together with the location of the events, in the detector, the pulse shapes
to be observed. It is shown for beta-beta decay of
76Ge, that
beta-beta events are separable from Compton scattering of gamma events of the
same energy, while double escape peaks of gamma-lines show very similar
behaviour as 0nu beta-beta events, and in that sense can be useful for
corresponding 'calibration' of pulse shapes of the detector.
----------------
Nr. 4: Another NEW article (pdf file)
Phys. Lett. B 636 (2006) 235-247
H.V. Klapdor-Kleingrothaus, I.V. Krivosheina, V. Mironov and I.V. Titkova
"Microscopic Calculations of Signals of Double
Beta Decay in
a 76Ge Detector and first Application
to the Heidelberg-Moscow Experiment"
-------- Abstract --------
The identification of signals of neutrinoless double beta decay is a
question of extreme interest. Starting from the Monte Carlo calculated time
history and spatial energy distribution of neutrinoless double beta events, for
the first time the expected
pulse shapes to be observed in a big
76Ge detector have been calculated
'microscopically' , by using
the Poisson Superfish code for determination of the field distribution in the
detector. It is shown, that for the majority of 0nu beta-beta events it is not
possible to differentiate between the contributions of different particle
physics parameters entering into the \onbb decay process - in the mass mechanism
the effective neutrino mass and the right-handed weak current parameters lambda,
eta. It is shown, that on the other hand it is possible in a
76Ge
double beta decay experiment to reject a background of larger sizes (high
multiplicity) gamma events by selecting low size (low multiplicity) events.
First application of the theoretical beta-beta pulses to events from the
line observed at 0nu beta-beta (Phys. Lett. B 586 (2004) 198 and NIMA 522 (2004)
371) show very good
agreement. It is shown further that a good position
determination of beta-beta events in the detector is possible. By the same type
of calculation it is shown that use of the pulse shapes of the 1592 keV double
escape line of the 2614 keV gamma-transition from
228Th for
calibrating a neuronal net for search of events of neutrinoless double beta
decay has a sound basis.
----------------
Last modification (I.Krivosheina): 25/12/2007