1,720,988 research outputs found
Single Particle Thermal Detection in Superconducting Rhenium
No full textSingle-particle thermal detection of alpha-particles and gamma-rays in small composite bolometers with superconducting rhenium acting as absorber is successfully demonstrated. It is shown that, at temperatures below 100 mK, the particle energy is quickly thermalized and the effective heat capacitance of the rhenium is slightly higher than the Debye contribution but less than 1% of the electronic contribution of a metal in the normal state
First results of the calorimetric spectrometer for the beta decay of rhenium-187
No full textAn outlook on the relevant progresses in the rhenium experiment with cryogenic detectors that has been made in the past year will be presented. We will discuss how the surrounding environment causes a ripple-like perturbation on the energy spectrum called Beta Environmental Fine Structure (BEFS). In 3 months of effective data acquisition we collected about 6 millions of events, achieving the sensitivity to observe for the first time the BEFS effect in the energy range 300-1600 eV, where its amplitude is at level of 1%. This distortion will have to be taken into account in the experiment in order to identify the kink in the high-energy end of the decay spectrum caused by a light neutrino
Possible detection of the 17KeV neutrino signal in electron capture
No full textThe existence of the 17 keV neutrino can be tested by measuring the ratio P(K)/P(L) of orbital electron capture probabilities from K and L electronic shells in allowed transitions to different nuclear final states. Ba-133 is a suitable candidate. A precise value of Q(EC) is needed. We suggest a method of determining Q(EC) independent on electron capture
Further results on u-Calorimeter with superconducting Absorber
No full textThe thermalization process of the energy released by a-particles in superconducting crystals used as absorber for mu-calorimeters is studied for an extended sample of materials at temperatures between 40 and 100 mK.The simple dependence of the thermalization times on T/T(Debye) already observed is confirmed. Results on the effect of coatings with Bismuth and Copper on Rhenium are also reported
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