Abstract
Several applications in modern nuclear physics, research and engineering are limited by a lack of precise knowledge in spectral shape data for beta-decays. Specifically the interest aims to study spectral data for forbidden decays with respectively long half-lives, which is one of the central activities of our group. For the investigation of those rare beta-decays the group operates a setup of six PIPS detectors in a vacuum chamber built out of low-radioactivity materials. In the long term the setup will be used as low-background-detector for the investigation of rare beta-decays. In order to reduce the measuring-background a muon veto was installed. The characterization of the setup in the energy-range from 20..1000 keV using conversion-electrons is described. A set of useful calibration-nuclides was established to determine energy calibration and efficiencies.
Highlights
Several applications in modern nuclear physics, research and engineering are limited by a lack of precise knowledge in spectral shape data for beta-decays
For the investigation of those rare beta-decays the group operates a setup of six PIPS detectors in a vacuum chamber built out of low-radioactivity materials
At the ‘Institute of Nuclear- and Particle physics’ (IKTP) at TU-Dresden a Low-Background PIPS-detector (Passivated Implanted Planar Silicon) setup was installed for precise spectral shape measurements especially for investigation of forbidden decays with a maximum Beta-Endpoint-Energy of Eβ ≈ 1 MeV
Summary
The study of beta-spectral-shapes was of great interest in the 1950 to the 70-ties. The present work aims for new precision measurements, especially for forbidden decays. At the ‘Institute of Nuclear- and Particle physics’ (IKTP) at TU-Dresden a Low-Background PIPS-detector (Passivated Implanted Planar Silicon) setup was installed for precise spectral shape measurements especially for investigation of forbidden decays with a maximum Beta-Endpoint-Energy of Eβ ≈ 1 MeV. The ion-implanted front-contact with a maximum thickness of 50 nm is a special feature of the used PIPS detectors in order to provide a minimal entrance radiation-window. In order to achieve a minimal background-level the setup was shielded actively and passively for ionising radiation from natural radioactivity and cosmic rays. The modular system biases the connected detectors with the high-voltage (iseg 203M), amplifies and shapes the detector-signal where the output signals have an energy-proportional pulse-height. Those signals from the PIPSs and the veto-detector are acquired with a FAST-Comtec MPA4 multiparameter-system, which allows a coincidence-/ anticoincidence analysis
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