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Radon-implanted 214Po and anomalous pulses in sodium iodide detectors for dark matter

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 490:1-2 (2000) 6-8

Authors:

S Cooper, H Kraus, J Marchese

Abstract:

214Po is implanted into surfaces exposed to radon. The implantation rate could be sufficient to explain the rate of low-energy events with anomalously fast scintillation pulses that has been observed in sodium iodide crystals used in a search for WIMP dark matter. The rate should be closely coupled in time to the radon concentration. (C) 2000 Elsevier Science B.V.
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Superconducting phase transition thermometers for X-ray spectroscopy

PHYSICA B 284 (2000) 1998-1999

Authors:

M Bruckmayer, S Cooper, H Kraus, F Probst, W Seidel

Abstract:

We report on a first attempt on a cryogenic imaging spectrometer based on sapphire absorber and two superconducting phase transition thermometers. One-dimensional imaging was achieved over a length of 10 mm with a spatial resolution of approximate to 200 mu m and an energy resolution of 216 eV for 5.89 keV X-rays. (C) 2000 Elsevier Science B.V. All rights reserved.
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The CRESST dark matter search

NUCL PHYS B-PROC SUP 87 (2000) 70-73

Authors:

J Jochum, M Bravin, M Bruckmayer, C Bucci, S Cooper, S Giordano, F Von Feilitzsch, R Keeling, H Kraus, M Loidl, J Lush, J Marchese, O Meier, P Meunier, U Nagel, F Probst, Y Ramachers, J Schnagl, W Seidel, I Sergeyev, M Sisti, L Stodolsky, S Uchaikin, L Zerle

Abstract:

We present the current status of CRESST (Cryogenic Rare Event Search using Superconducting Thermometers) project and new results concerning detector development. The basic technique involved is to search for WIMPs by the measurement of non-thermal phonons, as created by WIMP-induced nuclear recoils. Combined with our newly developed method for the simultaneous measurement of scintillation light, strong background discrimination is possible, resulting in a substantial increase in WIMP detection sensitivity.
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Imaging X-ray spectroscopy with superconducting phase transition thermometers

NUCL INSTRUM METH A 444:1-2 (2000) 208-210

Authors:

M Bruckmayer, S Cooper, H Kraus, F Probst, W Seidel

Abstract:

We report on the development of an imaging cryogenic X-ray spectrometer based upon X-ray absorption in sapphire and readout by two tungsten superconducting phase transition thermometers (SPTs). We achieve one-dimensional imaging over an absorber length of 10 mm with a position resolution of approximate to 200 mu m. (C) 2000 Elsevier Science B.V. All rights reserved.
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Quasiparticle diffusion and edge losses in superconducting tunnel junction detectors with two active electrodes

NUCL INSTRUM METH A 444:1-2 (2000) 15-18

Authors:

L Parlato, G Ammendola, R Cristiano, E Esposito, L Frunzio, H Kraus, M Lisitskii, C Nappi, S Pagano, G Peluso, G Pepe, P Valko, A Barone

Abstract:

A theoretical model to describe the spectral response of SIS tunnel junctions under irradiation in the presence of diffusion and edge losses of non-equilibrium quasiparticles has been developed. The model takes into account the back-tunnelling effect, in the general case of asymmetrical rates of tunnelling, gamma(12) not equal gamma(21). It provides a quantitative estimate of parameters like the edge reflectivity, the diffusion length and the diffusion coefficient, which are important parameters for a diagnostic of STJ-detectors. The predictions of the theory are compared with an experimental spectrum obtained from a Nb-based STJ. (C) 2000 Elsevier Science B.V. All rights reserved.
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