JRA2 - IDEA

1
Prague, 20/04/2006
JRA2 - IDEA
Andrea Giuliani
University of Insubria (Como) and INFN - Milano
2
IDEA presentation of the tasks
3
Milestones/deliverables to be achieved within
31/3/2006
4
Working packages with important changes in the
program

• P2 - 150Nd project

• B2 - Underground crystal growth

5
P2 - 150Nd project status

• Several Nd-based bolometers were realized and
  tested
• (foreseen deliverable).
• Another due deliverable (NDT sensors spanning a
  wide
• temperature operation range) has been
  achieved.

results
NdGaO3 detectors
10x10x10 mm
30x30x30 mm
Cooling down curves
6
P2 - 150Nd project status
The NdGaO3 detector responds to thermal
excitations injected by a heater, but not
satisfactorily to equivalent energies delivered
by elementary particles
Possible explanation of this fact is that
elementary particles, unlike Joule heating
injections, produce excitations (e-h pairs
before and ballistic phonons after) which couple
to the nuclear spin system of the crystals,
whose specific heat is huge
This effect should disappear in a pure
150Nd crystal, since the nuclear spin is due to
the odd A isotopes 143Nd (12.2 ) and 145Nd (8.3
)

• Three steps program
• find, rent or purchase 50 g Nd enriched as much
  as possible in 150Nd
• grow a crystal with this isotopic pure material
• operate the crystal as a bolometer

7
P2 - 150Nd project
Reformulation of the objectives keeping the
spirit of the task
- Use of the bolometric technique in order to
study promising candidates for neutrinoless
double beta decay with high Q-value (as
150Nd), such as 116Cd and 100Mo. - An
additional feature will be to measure
scintillation light besides heat, in order to
reject alpha background that dominates over 2.6
MeV.
impressive results obtained with a CdWO4 crystal
the natural radioactivity background for 0n-DBD
can be totally suppressed
new name for the task
Scintillating bolometers for high Q-value DBD
candidates
8
B2 - Underground Crystal Growth status for TeO2
Contac with two crystal companies in the US to
explore the possibility to grow crystals with the
CZ method. The traditional provider (SICCAS,
Shanghai, China) does not use and does not intend
to implement the CZ method.
TeO2 crystal production facilities contacted in
USA
Company Integrated Photonics Inc. (IPI),
Hillsborough NJ
Company Crystal Technology Inc. (CTI), Palo Alto
CA
One 3x3x3 cm3 crystal was purchased and
successfully tested as a bolometer in LNGS Four
5x5x5 cm3 crystals (a complete CUORE single
module) are under test in CUORE-like
configuration
9
B2 - Underground Crystal Growth status for TeO2
An interesting point which is emerging from B1
activity is that activation mechanisms for Te are
less relevant than expected initially, and could
lead to reformulate activities in B2.
analysis of steps and controls required to get
extreme radio-pure TeO2 crystals
example analysis of the SICCAS production cycle
HNO3
???? 2Te9HNO3 ? Te2O3(OH)NO38NO24H2O Chemical
reaction Te2O3(OH)NO3?2 TeO2HNO3
?? Washing
TeO2
Te
all reactives tested, OK
already tested, OK
HCl
?? Filtration
???? TeO2HCl?TeCl4H2O Chemical reaction
???? TeCl44NH4OH?Te(OH)44NH4Cl Chemical
reaction Te(OH)4?TeO2H2O
NH4OH
?? Washing
glass funnel and ceramic filter
?? Washing
??? Dryness
?? Removing water
TeO2 final product purity
99.99
10
Financial situation and third pre-financing
request for III prefinancing
175000
140000
25000
11
Financial situation and third pre-financing
2500
3600
55000
6000
12
Financial situation and third pre-financing
9000
3300
2000
1400