Low Radioactivity Techniques 2017

Session

Session 8

26 May 2017, 14:50

Seoul

Conveners

Session 8: Purification techniques for solids

• Mark Chen (Queen's University)

Session 8: Purification techniques for solids

• Mark Chen (Queen's University)

55. Improving background levels of CaWO${}_4$ detectors for the CRESST dark matter search

Dr Raimund Strauss (Max-Planck-Institut für Physik München)

26/05/2017, 14:50

Oral

The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment, its third phase has successfully started in summer 2016, aims at the direct detection of dark matter particles. CRESST uses CaWO${}_4$ crystals operated as cryogenic detectors at a temperature of ~10mK. During recent years, the intrinsic radiopurity of CaWO${}_4$ crystals, the capability to reject recoil events...

29. Impact and Mitigation of Naturally Occurring ${}^{32}$Si

Dr Mary Bliss (Pacific Northwest National Laboratory)

26/05/2017, 15:10

Oral

The recent observation by the DAMIC experiment of ~80 events/day/kg, associated with trace levels of ${}^{32}$Si in their CCDs, is a concern for future Si-based dark matter detectors. These data suggest a ${}^{32}$Si concentration of ~1 in 10${}^{18}$ Si atoms. With a half-life of order 153 years, any geologically aged silicon source should be nearly devoid of ${}^{32}$Si. Yet the DAMIC silicon is...

31. Progress in Ultra-Low-Radioactive titanium production

Mr Alexander Chepurnov (SINP MSU)

26/05/2017, 15:30

Oral

Basic principles of titanium production together with very high technological culture of titanium industry predefined a possibility to develop a technological cycle of the ultra-low-radioactive titanium (ULR-Ti) production. It was confirmed experimentally that it is possible to produce a titanium sponge with a level of contaminations below 1 mBq/kg of U and Th within an industrial...

46. MoO3 and NaI powder purification for AMoRE and COSINE to make ultra-low background crystals

Dr Olga Gileva (Center for Underground Physics, IBS)

26/05/2017, 16:10

Oral

The AMoRE (Advanced Mo based Rare process Experiment) is searching for neutrinoless double beta decay of 100Mo using radiopure molybdate-based crystals. The COSINE collaboration is searching for dark matter with ultra-low background NaI crystals either to confirm or to refute the DAMA signal. Since there are no commercially available powders with required purity levels to grow Mo-based crystal...

48. Organic Scintillator and Tellurium Purification Techniques of the SNO+ Double Beta Decay Experiment

Dr Szymon Manecki (Queen's University)

26/05/2017, 16:30

Oral

SNO+ will be a successor to the Sudbury Neutrino Observatory (SNO) that will be filled with an organic liquid scintillator and optimized to maximize its sensitivity to neutrinoless double beta (NLDBD). The project will be executed in three phases; In the first phase, that is currently approaching completion, the detector will be filled with light water, that would then be displaced by 780...

64. Developing Radiopure Copper Alloys for High Strength Low Background Applications

Mr E. W. Hoppe (Pacific Northwest National Laboratory)

26/05/2017, 16:50

Oral

High purity copper continues to play an important role for ultra-low-background detectors. Measurements of rare nuclear decays, e.g. neutrinoless double-beta decay, and searches for dark matter can require construction materials that have high thermal and electrical conductivity with bulk radiopurity less than one micro-Becquerel per kilogram. However, experiments currently using components...

71. Precursors preparation for growth of low-background scintillation crystals

Dr Vladimir Shlegel (Nikolaev Institute of Inorganic Chemistry(NIIC))

26/05/2017, 17:10

Oral

Precursors play important role in obtaining crystals with preassigned functional properties. Impurities in precursors significantly influence optical properties, radiation hardness and light output of scintillating crystals, concentration of impurities directly correlates with radioactive background of scintillating crystals. As an example, during BGO growth the methods of purification and...