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150 Nd Project

150 Nd Project. Why not 150 Nd experiments so far ?. Bolometers requirements. Nd crystals. Working group’s. Time schedule. Two Crystal compounds. NdF 3. Already tested during the past. 10 g sample. Regarding the NdF 3 we observed the same behaviour observed in the past.

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150 Nd Project

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  1. 150Nd Project • Why not 150Nd experiments so far ? • Bolometers requirements • Nd crystals • Working group’s • Time schedule Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  2. Two Crystal compounds NdF3 Already tested during the past 10 g sample Regarding the NdF3 we observed the same behaviour observed in the past. A very big heat load/capacity prevents the cooling of the crystal. 16 g sample 200 g sample NdGaO3 Good “theoretical” candidate The small sample was tested at sea level @ Milano-Bicocca and Firenze The big sample was tested deep underground @ LNGS Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  3. NdGaO3 Milano-Bicocca Test PTFE supports 1.3x1.3x1.3 cm3 Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  4. Paramagnetic heat capacitance NdGaO3 Milano-Bicocca Test Final temperature 38.5 mK Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  5. NdGaO3 Firenze Test The main difference was in the choice of the thermal conductance between crystal and Cryostat. The choice was a hard contact in order to cool down the crystal to lower temperatures with respect the ones reached in Milano. Nylon wires 1.5 cm2 thermalization surface Cu-NdGaO3 Mixing chamber Temperature: 20 mK Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  6. NdGaO3 Firenze Test Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  7. NdGaO3 LNGS Test 200 g 3x3x3 cm3 PTFE supports (low conductance) Two different set-up were used Low conductance set-up High conductance set-up Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  8. NdGaO3 LNGS Low Conductance Lowest temperature reached: 58 mK Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  9. NdGaO3 LNGS high conductance After 10 days the temperature reached was ~34 mK After 50 days (now) the temperature reached ~19 is mK We see thermal pulses, but some doubts arise on the identification of particle pulses Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  10. First year Program • Study on low temperature specific heat of Nd compounds ( NdF3 – NdGaO3 ) • Study of bolometric behaviour of NdF3 and NdGaO3 bolometers What shall to be done in the future ? Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

  11. Other crystals Several tests were made in the R&D cryostat @LNGS during the lasts months The idea is to move towards a active background rejection Double readout heat - light 100Mo 3034 keV PbMoO4 Nuclei with Q-Value above the 208Tl -  line 48Ca 4271 keV CaMoO4 Preliminary results shows that the scintillation of CaMoO4 is a factor 2 larger with respect PbMoO4 Stefano Pirro, IDEA Meeting - Heidelberg October 21, 2004

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