1. Integrated Double-beta-decay European Activity
Paris, November 2007
JRA2 - IDEA
Integrated Double-beta-decay European Activity
Status of the activity
Andrea Giuliani
Insubria University, Como, and INFN – Milano, Italy

2. I1 - Isotope enrichment – S. Jullian
See Dominique Lalanne’s talk

3. P1 – 82Se project – D. Lalanne
See Dominique Lalanne’s talk

4. P2 – 150Nd project – S. Pirro Several high T0 thermistors available
Procurement of CaF2, CaMoO4, CdWO4, ZnSe, CaMoO4 crystals
Several high T0 thermistors available
Ge and Si light detectors tested with 55Fe source

5. Ge light detector tested with 55Fe source
P2 – 150Nd project – S. Pirro
Ge light detector tested with 55Fe source
CaF2 - 3x3x3 cm3
DE = eV

6. B1 – Cosmogenic induced activity – S. Cebrian – M. Pavan
p on a TeO2, data analysis and final results on activation yields are being completed
Experiment in design: p beams (CERN) of 1.4 and 24 GeV on Ge targets. MI group + US collaborators.
Experiment running: n on Te at Los Alamos (WNR facility, GEANIE detector). MI group + US collaborators.
Activation on Cu brick at exposed at 2000 m in Modane
Study on Nd Zn Cd
in next months
Natural activation on NaI detectors (ANAIS) – Now activation test
Collaboration with GEANT4: needs of underground community

7. B2 – Underground crystal growth – J. Morales – S. Capelli
Estimation performed. Severe 210Pb contamination
protocol to produce extreme radiopure TeO2 crystals at SICCAS (Bridgman technique)
clear codification and check of all production phases
purpose dedicated production unit, crystal growth facility and clean room, installed at producer.
6 crystals have been produced in spring 2007, following the agreed protocol.
mechanical processing, previously performed at LNGS, have been implemented at producer.
new lapping powders have been selected, based on radiopurity requirements
new polishing pad have been chosen.
new drying and calcination procedures have been tested
ICPMS measurements have been performed of the TeO2 powders.
See Silvia Capelli’s talk

8. B3 – Rejection of surface radioactivity – M. Pedretti
Polyethylene foils to shield the copper frame
Tests on coating of the copper frames with plastic materials
Implementation of a full cleaning procedure for copper
Mechanical + Chemical + Electrolytic + Plasma (LNL – INFN)
First test already made. Second test in progress
See Claudia Nones’ talk
New tests on surface sensitive bolometers with a new approach derived
from the EDELWEISS collaboration

9. B4 – Operation of Ge diodes in liquid nitrogen – S. Schoenert
Development of the argon purification plant.
activated carbon CarboAct has been finally selected
geometry of the column has been determined: a cylinder with f = 130 mm - l = 650 mm
the total mass of the filled in charcoal is 602 g.
the column has been constructed in the MPI-workshop and tested Radon emanation of cryogenic storage tanks  were also continued.
See Grzegorz Zuzel’s talk