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Agenda
for the parallel workshop sessions in Double Beta Decay, Neutrino Mass.
All links marked with a⇓ can be used to show/hide the abstracts and presentations.
Click here to show/hide all presentations and abstracts and here for a print version.
You may also download the compact program booklet (PDF, 1.9 MB)
and an abstract booklet (PDF, 0.4 MB).
As long as authors provided us with PDF versions of their slides, the corresponding downloads are available on this page.
Monday – Sep 5, 2011
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14:30 – 16:10 |
Double Beta Decay, Neutrino Mass W1
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Parallel Session (Clubraum 1) – Chair:
Giorgio Gratta
14:30
(15' + 5')
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Results of the NEMO-3 experiment⇓
slides
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Laurent Simard (LAL, Université Paris-Sud 11)
The NEMO-3 detector searches for the neutrinoless double beta; the observation of this process, beyond the Standard Model, would prove that the neutrino is a Majorana particle. The NEMO-3 detector is a tracko-calo low-background detector: electron trajectories are reconstructed, then their energies are arrival times are measured. It has taken data between 2003 and 2011.
Preliminary results for the neutrinoless double beta decay of 82Se and 100Mo will be given. Results concerning the allowed process in the standard model, which is the double beta decay with 2-neutrino emission, will also be given for the different isotopes (100Mo, 82Se, 130Te, 116Cd, 96Zr, 150Nd, 48Ca).
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14:50
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CUORICINO: Final results⇓
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Sergio Di Domizio (Università di Genova and INFN Sezione di Genova)
CUORICINO, the predecessor experiment of CUORE, was operated in Gran Sasso National Laboratories in Italy and demonstrated the CUORE feasibility. The CUORICINO detector was an array of large cubic TeO2 crystals summing up to the total mass of 40 kg. CUORICINO stopped the data taking in middle 2008. In this talk we will present the Cuoricino detector performances and experimental final results in DBD, on ground and excited states of Te-130 and on Te-120, together with the total data analysis that is of fundamental interest in the prediction of the expected CUORE-0 and CUORE background.
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15:10
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Project 8: Measuring neutrino masses using radio-frequency techniques⇓
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Joseph Formaggio (Massachusetts Institute of Technology)
Although the neutrino mass affects the spectral shape of tritium beta decay electrons, no experiment has yet observed this distortion. The Project 8 Experiment proposes to measure that spectral distortion in a novel way: through coherent cyclotron emission of the beta electrons confined in a magnetic field. The relativistic frequency shift of emitted radiation depends on the total energy of the electron and may provide greater resolution than other techniques. This presentation covers the status of a prototype to demonstrate single-electron detection at energies near the tritium endpoint, 18.6 keV, through cyclotron emission. Results from the prototype experiment are expected to be of value in estimating the scale and sensitivity of a neutrino mass experiment based on this technique.
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15:30
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The MAJORANA DEMONSTRATOR: A search for neutrinoless double-beta decay of Germanium 76⇓
slides
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John Wilkerson (University of North Carolina)
The observation of neutrinoless double-beta decay would show that neutrinos are Majorana particles and provide information on the absolute scale of neutrino mass. Attaining sensitivities for neutrino masses in the inverted hierarchy region requires large, tonne scale detectors with extremely low backgrounds, ~ < 10-4 counts/(keV kg yr) in the region of interest. The MAJORANA collaboration is constructing the DEMONSTRATOR to show the feasibility for a future tonne scale experiment. It consists of 40 kg of p-type point contact germanium detectors, at least half of which will be enriched to 86% in 76Ge that are placed into two Cu cryostats fabricated out of ultra-low activity Cu that has been electroformed underground. The cryostats will be surrounded by a graded compact shield.
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15:50
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Status report of the GERDA experiment⇓
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Carla Maria Cattadori (INFN)
The GERDA experiment, designed to search for neutrinoless double beta decay of Ge-76, started the technical runs in 2010, with a pilot string of 3 non-enriched Ge detector.
In this talk we will report the results on background characterization, from the first year of data taking, as well as the forthcoming phase I physics program which foresee the deployment of the enriched germanium detectors.
Finally, the status of the GERDA phase II preparation, and of the related R&D will be summarized.
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Tuesday – Sep 6, 2011
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14:30 – 16:10 |
Double Beta Decay, Neutrino Mass W2
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Parallel Session (Clubraum 1) – Chair:
Stefan Schoenert
14:30
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LUCIFER: A scintillating bolometer array for the search of neutrinoless double beta decay⇓
slides
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Laura Cardani (Università Roma "la Sapienza")
Neutrinoless Double Beta Decay (0nDBD) is the most promising process to
understand the nature of the neutrino (Dirac or Majorana).
The goal of the LUCIFER project, financed by a ERC-AdG, is the study of
the 82Se 0νDBD through an array of ZnSe scintillating bolometers.
A high sensitivity on this rare decay will be achieved through the
simultaneous read-out of the heat and light signals. This will provide a
background discrimination, and it will allow to reach a level of < 0.001
counts/kg/keV/year.
In addition, a large source mass will be achieved through the enrichment
of Se into 82Se.
The feasibility of the isotopic enrichment as well as the growth of
radio-pure ZnSe crystals will be discussed in this talk.
The recent results of the R&D on ZnSe crystals will also be presented.
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14:50
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SuperNEMO double beta decay experiment⇓
slides
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Alexander Barabash (Institute of Theoretical and Experimental Physics)
Main objective of SuperNEMO experiment is search for neutrinoless double beta decay of 82Se with sensitivity ≈ (1-2)×1026 yr that corresponds to sensitivity to effective Majorana neutrino mass ≈ 0.05-0.1 eV. The detector will consist of 20 independent modules surrounded with passive shield and placed deeply underground (Frejus Underground Laboratory, 4800 mwe). In present time Collaboration has started creation of installation the Demonstrator which to be the first module of SuperNEMO and it is intended for studying and optimization of all characteristics of the detector. Besides, on installation the Demonstrator is supposed to investigate 7 kg of 82Se with sensitivity 6.5times;1024 yr (≈0.2-0.6 eV). The present status of SuperNEMO program and plans for the future are discussed.
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15:10
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Implications of finite one-loop corrections on see-saw neutrino masses⇓
slides
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Diego Aristizabal (Universite de Liege)
In the standard seesaw model, finite corrections to the neutrino mass matrix arise from one-loop self-energy diagrams mediated by a heavy neutrino. In this talk I will discuss the impact that these corrections may have on the different low-energy neutrino observables paying special attention to their dependence with the seesaw model
parameters. It will be shown that sizable deviations from the tribimaximal mixing pattern can be obtained when these corrections are
taken into account.
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15:30
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Study of 48Ca double beta decay by CANDLES⇓
slides
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Izumi Ogawa (University of Fukui)
CANDLES is the project to search for double beta decay (DBD) of 48Ca by using CaF2 scintillators. The Q-value of 48Ca, which is the highest (4.27 MeV) among potential DBD nuclei, is far above energies of γ-rays from natural radioactivities (maximum 2.615 MeV from 208Tl decay), therefore we can naturally expect small backgrounds in the energy region we are interested in. We have constructed the prototype detector, CANDLES III in our laboratory (Osaka U.) at sea level and studied the basic performance of the system, including the light collection, position reconstruction and background rejection. After R&D study we moved the detector system to new experimental room at Kamioka underground laboratory. Present status of the CANDLES III detector will be presented
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15:50
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CUORE detector: An update⇓
slides
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Paolo Gorla (INFN - Roma Tor Vergata)
CUORE is a bolometric detector composed of 988 TeO2 crystals, with a total mass of about 200 kg of Te-130, currently under construction at the Gran Sasso National Laboratories in Italy. It will probe the neutrinoless double beta decay (0nuDBD) of Te-130, a tool to test the neutrino nature and mass at the level relevant for exploring the inverted neutrino mass hierarchy. On the road towards CUORE, the first tower (CUORE-0) will be assembled and operated in near future. Detailed information on this detector and on the expected performance
will be given. We will then discuss the status of the CUORE experiment, including a discussion of CUORE critical points, the recent R&D efforts and its sensitivity.
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Wednesday – Sep 7, 2011
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14:30 – 16:10 |
Double Beta Decay, Neutrino Mass W3
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Parallel Session (Clubraum 1) – Chair:
Alexander Barabash
14:30
(15' + 5')
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Status of calculations of the nuclear matrix elements for double beta decay⇓
slides
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Vadim Rodin (Universität Tübingen)
The present status of calculations of the nuclear matrix elements for neutrinoless double beta decay is reviewed. Advantages and disadvantages of different nuclear structure models used for the calculations are discussed in detail. A proposal of a direct measurement of the Fermi matrix element for neutrinoless double beta decay is briefly presented.
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14:50
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Nuclear matrix elements for double beta processes⇓
slides
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Jouni Suhonen (University of Jyväskylä)
Two-neutrino and neutrinoless double beta decays to ground states and various excited states (0+,2+) are recently studied in the framework of a higher QRPA theory. Different characteristics of the ground-state and excited-state decays are analysed in terms of decompositions of the associated nuclear matrix elements (NMEs). Special interest is directed to seldom discussed nuclei for the double beta minus decays and to nuclei that are double positron/electron-capture candidates. The most intriguing resonant neutrinoless double electron capture is discussed for several potential cases. For the neutrinoless decays the short-range correlations and other relevant effects are included in the formalism. The results have been submitted to Nucl. Phys. A and Phys. Lett. B for publication.
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15:10
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Magnetic tracking detector DCBA/MTD for neutrinoless double beta decay experiments⇓
slides
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Nobuhiro Ishihara (KEK)
Magnetic tracking detector is in progress at KEK for neutrinoless double beta decay experiments. Drift Chamber Beta-ray Analyzer (DCBA) is an R&D program. A prototype called DCBA-T2 has been constructed and operated. The obtained energy resolution is about 150 keV (FWHM) at 980 keV. Its engineering run has been made with a source of natural Mo. So far we have obtained 20 candidates of two-neutrino double beta decay from Mo-100 of 0.036 mol, and 39 events of the decay from Bi-214 to Po-214. Another prototype DCBA-T3 is now under construction. Its energy resolution is expected to be less than 100 keV (FWHM). On the basis of DCBA-T2&T3, we have designed a future project temporarily called Magnetic Tracking Detector (MTD). One module of MTD will be able to accommodate decay source of 32 kg.
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15:30
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Discovering neutrinoless double beta decay with NEXT100 detector⇓
slides
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Francesc Monrabal Capilla (IFIC)
NEXT is a neutrinoless double beta decay experiment, based on a 100kg high pressure gas Xenon. It is now completing the final stages of R&D and will start construction next year. We plan to start data taking at the Canfranc laboratory in 2014.
NEXT proposes a novel detection technique called SOFT (Separated Optimized Function TPC).That concept optimizes the measurement of the topological signature of the event. This result in a powerful background rejection, which, combined with a carefully screened radiopure detector will allow NEXT to be competitive with existing proposals for next-generation neutrinoless double-beta decay experiments.
First prototypes have been operating successfully in different laboratories giving first results on energy resolution. Results give a resolution of 1%@Qbb
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15:50
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The Enriched Xenon Observatory (EXO) double beta decay experiment: Status and early results⇓
slides
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Phillip Barbeau (Stanford University)
The EXO experimental program is aimed at searching for neutrinoless double beta decay of Xe-136. Observation of this decay would establish the Majorana nature of the neutrino and set the absolute mass scale of neutrinos. The EXO-200 detector contains 200 kg of xenon enriched to 80% in Xe-136 in an ultra-low background TPC. The detector is currently operational at the WIPP site and was commissioned with natural xenon to study its performance; preparations for physics runs are underway. Preliminary results from the EXO-200 experiment will be presented and its science program illustrated. The collaboration is performing R&D to realize a background-free search for which the double beta decay daughter nucleus is also detected. The prospects for a ton scale experiment are also discussed.
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Thursday – Sep 8, 2011
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14:30 – 16:10 |
Double Beta Decay, Neutrino Mass W4
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Parallel Session (Clubraum 1) – Chair:
Jouni Suhonen
14:30
(15' + 5')
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Relic antineutrino capture on 163Ho decaying nuclei⇓
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Marco Vignati (Sapienza, Università di Roma and INFN)
The electron capture decay of the isotope 163Ho has been proposed since a long time as a candidate for measuring the electron neutrino mass and recently the interest on this idea has been renewed. We note that a direct observation of the cosmic antineutrino background could be made using a target made of this isotope. We further discuss the requirements for an experiment aiming to obtain this result.
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14:50
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Low energy signatures of the TeV scale see-saw mechanism⇓
slides
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Emiliano Molinaro (CFTP - IST)
We study a type I see-saw scenario where the right-handed (RH) neutrinos, responsible for the light neutrino mass generation, lie at the electroweak scale. Under certain conditions, the strength of the charged and neutral current weak interactions of the Standard Model particles with the heavy RH neutrinos can be large enough to allow the production of the latter at the LHC. We show that all present experimental constraints on this scenario still allow i) for an enhancement of the rate of neutrinoless double beta decay and and ii) for the predicted mu to e+gamma decay rate to be within the sensitivity range of the MEG experiment.
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15:10
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Recent progress of the COBRA experiment⇓
slides
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Christian Oldorf (Universität Hamburg)
The COBRA experiment uses CdZnTe semiconductor detectors to search for neutrinoless double beta decays. The main focus is on the isotope Cd-116, with a decay energy of 2809 keV well above the highest naturally occurring gamma lines. Also 130Te and 106Cd, a double β+ emitter, are under investigation.
An overview of the recent improvements of the COBRA low-background setup at the LNGS underground laboratory is given, including first results obtained with new FADC readout electronics which allows background reduction by pulse-shape analysis. Furthermore studies on detector characterization, the use of liquid scintillator for background suppression and Monte-Carlo simulations of the shielding are presented. Finally, concepts for a large-scale setup will be shown.
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15:30
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Searches for neutrinoless resonant 2e captures at LNGS⇓
slides
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Vladimir Tretyak (Institute for Nuclear Research, Kyiv, Ukraine)
Searches for neutrinoless resonant double electron captures (0ν2e) are considered now as possible alternative for 0ν2β- decays in testing the non-zero Majorana neutrino mass. Series of experiments was performed at LNGS to search for 0ν2e processes in 96Ru, 106Cd, 136Ce, 156Dy, 180W, 190Pt by ultra-low background HP Ge gamma spectrometry, and with ZnWO4 and enriched 106CdWO4 crystal scintillators. New T1/2 limits on these processes were established, many of them obtained at the first time or more stringent than those known previously. In particular, T1/2 limits for 96Ru are on the level of 1019 yr, and for 106Cd – on the level of 1020 yr.
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15:50
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Neutrinoless double beta decay with SNO+⇓
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Jeffrey Hartnell (University of Sussex)
SNO+ will perform a sensitive search for neutrinoless double beta decay using 800 tons of Nd-doped liquid scintillator. Conversion of the SNO detector to SNO+ is proceeding well: a short light-water phase will begin next year followed by physics runs with scintillator in early 2013. Doping the LAB liquid scintillator at around 0.1% by mass with Nd allows a ton-scale experiment to be performed, probing down to the 100 meV neutrino mass scale and beyond. The first phase will be with natural-Nd but enrichment for a second phase is a strong possibility.
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16:50 – 18:30 |
Double Beta Decay, Neutrino Mass W5
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Parallel Session (Clubraum 1) – Chair:
Oliviero Cremonesi
16:50
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Experiment TGV-2: Search for double beta decay of 106Cd⇓
slides
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Nikolay Rukhadze (Joint Institute for Nuclear Research)
Search for ECEC decay of 106Cd was performed at LSM (France, 4800 mwe) using the spectrometer TGV-2. The basic detection cell is a sandwich-like pair of face-to-face planar type detectors (20.4cm2x0.6cm) with foils of enriched 106Cd placed between them. The coincidences between two X-rays of Pd (~21 keV) detected in neighboring detectors were analyzed to search for 2νECEC decay of 106Cd. A small increase in the number of X(Pd)-X(Pd) events above background was obtained in TGV-2 experiment lasted 12900h. This may point to the presence of the 2νECEC decay of 106Cd at the level of T1/2 ~ 4.5 × 1020 yr (at 77% CL).New limit (at 90% CL) on 0νECEC resonant decay of 106Cd to 2741 keV excited state of 106Pd – T1/2 ≥ 1.8 × 1020 yr was obtained. A new measurement of 106Cd is in preparation.
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17:10
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Search for double beta decay of Cadmium 106 by using isotopically enriched cadmium tungstate crystal scintillator⇓
slides
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Fedor Danevich (Institute for Nuclear Research, Kyiv, Ukraine)
An experiment to search for double beta processes in 106Cd was carried out over 6549 h in the DAMA R&D set-up at the Gran Sasso Laboratory with the help of enriched in 106-Cd (66%) cadmium tungstate (106CdWO4) crystal scintillator (mass 215 g). New limits on different modes and channels of double beta decay of 106Cd have been established on the level of 1019-1021 yr. A possible resonant enhancement of the neutrinoless double electron capture is estimated in the framework of the QRPA approach. Sensitivity of the experiment can be improved by placing the 106CdWO4 crystal scintillator inside the ultra-low background set-up with four 225cm3 HP Ge detectors to use both coincidence and anti-coincidence information.
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17:30
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Leptogenesis and neutrino phenomenology with μτ symmetric four zero Yukawa textures⇓
slides
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Probir Roy (Saha Institute of Nuclear Physics)
Allowed four zero neutrino Yukawa textures in a specified weak basis, combined with μτ symmetry and type-I seesaw, yield a highly constrained and predicitve scheme. Oscillation data as well as the cosmological bound on the
neutrino mass sum and the requirement
of the generation of the right baryon
asymmetry via leptogenesis severely restrict the parameter space of the scheme resulting in the prediction of neutrino masses and their Majorana phases within definite ranges. Interesting rates emerge for 0νββ decay and
laboratory CP violation.
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17:50
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AMoRE experiment: A search for neutrinoless double beta decay of 100Mo isotope with 40Ca100MoO4 cryogenic scintillation detector⇓
slides
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Vasily Kornoukhov (ITEP)
AMoRE (Advanced Mo based Rare process Experiment) collaboration will use calcium molybdate crystals as cryogenic scintillation detector in a search for neutrinoless DBD of 100Mo isotope. Two detection mechanisms, phonons and light, will be used for the active rejection of backgrounds. A FWHM resolution of 0.2% in the phonon channel has been achieved with a 0.5 cm3 crystal. Several 0.55 kg 40Ca100MoO4 crystals have been produced from enriched 100Mo and 48Ca depleted materials. The light yield of these crystals has been shown to be comparable with reference CaMoO4 scintillators for temperatures ranging down to 8 K. The content of dangerous radioisotopes in the crystals is under measurement. The projected sensitivity of the experiment for a 250 kg-years data-taking period is 3x1026 years.
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18:10
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Status of the KamLAND-Zen experiment⇓
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Alexandre Kozlov (Tokyo university, IPMU)
The talk will be focused on preparations towards the KamLAND-Zen experiment.KamLAND-Zen physics goals and future plans will be also discussed. Currently we hope to begin the double-beta decay experiment using Xenon-136 within the next several month. Work to load a liquid scintillator containing Xenon-136 into a small central balloon is scheduled to summer of 2011.
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