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Pulse-tube based dilution refrigerators are massively employed in lowtemperature physics. They allow to reduce the running costs and to be operatedwith unprecedented easiness. However, the main drawback of this technology isthe mechanical vibrations induced by the pulse-tube cryocooler. Theseperturbations can cause extra-noises drastically affecting the detectorperformance. In this paper, we propose a solution to mitigate the impact ofthese vibrations by mounting the detectors in an elastic-pendulum basedsuspended tower. Based on vibration modeling and experimental tests, we showthat the vibration levels are attenuated by up to two orders of magnitude atmost frequencies, especially above $\sim20$ Hz, for both vertical and radialdirections. Thanks to this passive isolation solution, vibration levels, bothalong vertical and radial directions, below 1 $\mu\textrm{g/}\sqrt{\text{Hz}}$in the frequency range [1-1000] Hz are obtained. This provides a convenientenvironment to test the ultimate performance of low temperature detectors. As aresult, we report an improvement by one to two orders of magnitude on the noiselevels of massive cryogenic bolometers, leading to thermal energy resolutionsimproved by a factor 5 to 40. Finally, we conclude that the energy resolutionof our cryogenic bolometers are no longer limited from any residual vibrations,hence allowing the perspective of further improving our bolometer performancein the context of low-mass dark matter searches and neutrino physicsapplications.

Vibration decoupling system for massive bolometers in dry cryostats