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First results of the Ge semi-planar detector in LSM

First results of the Ge semi-planar detector in LSM. Pia Loaiza. Laboratoire Souterrain de Modane. ILIAS JRA1 meeting-Zaragoza, 23 rd November 2007. Low-background semi-planar Ge. Collaboration with CANBERRA and CENBG (Centre d’Etudes Nucléaires de Bordeaux Gradignan)

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First results of the Ge semi-planar detector in LSM

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  1. First results of the Ge semi-planar detector in LSM Pia Loaiza Laboratoire Souterrain de Modane ILIAS JRA1 meeting-Zaragoza, 23rd November 2007

  2. Low-background semi-planar Ge Collaboration with CANBERRA and CENBG (Centre d’Etudes Nucléaires de Bordeaux Gradignan) Arrived on September 20th at LSM BEGe: Crystal dimensions:  = 80 mm h=30 mm Vol = 150 cm3 Mass=0.8 kg Pulse-tube Pulse-tube controller Due to the semiplanar geometry: Suited for E<600 keV Good resolution at low energies We use a pulse-tube to cool down instead of liquid Nitrogen (for the first time in a HPGe in LSM) Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  3. Conception Ge Ge Standard configuration Configuration of the Ge semi-planar at LSM Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  4. Background simulations GEANT3 and GEANT4 At 238 keV, in counts/day: Simulation of background due to internal components, 1000 days counting Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  5. Shielding Pb archeo Pb standard Flush Radon-reduced air Pb archeo 5 cm archeological lead, 210Pb < 0.2 Bq/kg 15 cm Pb standard lead , approx 10-20 Bq/kg Pb standard Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  6. Background measurements PRELIMINAR 220Rn desintegration (1/2 = 55.6 sec) 222Rn desintegration (1/2 = 3.66 days) without shielding with shielding Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  7. Background measurements PRELIMINAR Number of counts: continuous plus peak without shielding with shielding Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  8. The problem of the resolution Source 152Eu Source 152Eu Source 22Na Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  9. Efficiency Standard IAEA RGU-1: Silica (SiO2) Uranium ore: 40 mm diam 3 mm high Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  10. Conclusion • LSM got its first own detector on Sept. 20th, 2007 (ILIAS-JRA1 funding) • Semi-planar Ge, suited for E<600 keV: • modified standard configuration • cooled with a pulse-tube • Excellent background level • Possibility to make very sensitive measurements for ‘planar’ geometries • at low energies • On-going studies to understand the origin of the remaining background Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

  11. Pia Loaiza, JRA1, Zaragoza, November 23th, 2007

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