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  • 1
    Electronic Resource
    Electronic Resource
    Beta spectrum studies with cryogenic micro-calorimeters (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 239-244 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low energy beta spectra are studied with sources encapsulated in a superconducting Sn absorber. An NTD germanium thermistor measures the temperature transient (≈5 msec) caused by individual beta decays, and the total energy not given to the neutrino is determined with a resolution of ≈0.5 keV (FWHM) and a threshold of ≈5 keV. The response function is determined from the mono-energetic electron capture and internal conversion source109 Cd, both separately and simultaneously with the beta spectrum. The endpoint of the unique first-forbidden decay107 Pd →107 Ag+e −+ $$\bar v$$ e is found to be37.5±0.1 keV. High statistics results are compared to the unique first-forbidden shape and the atomic exchange correction. The latter is seen for the first time. Preliminary results of a search for heavy neutrino admixtures are0.15±0.33%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693426
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Signal processing for cryogenic micro-calorimetry (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 275-280 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe electronics and signal processing techniques used to acquire data with our micro-calorimeters. The system includes front end electronics with cold FETs, an amplitude-independent trigger, pulse digitization and storage, and digital signal processing in software. We discuss some ideas for processing signals from devices which exhibit a variation in pulse shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693432
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cryogenic micro-calorimeters for low energy beta spectroscopy (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 269-274 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We are using calorimeters with completely encapsulated sources to study low energy beta spectra. Our devices work as true calorimeters in the sense that they totally absorb and sum all the various quanta released in a decay into a single temperature pulse with amplitude proportional to the total energy deposited. We use a neutron transmutation doped (NTD) germanium thermistor as the temperature sensor and superconducting NbTi leads, which form a weak thermal link to the cold stage (≈80 mK). We have been using superconducting tin as our absorber material, and we discuss various techniques for source and absorber preparation. Annealing the absorber leads to shorter pulses with larger amplitude, and significantly improves detector performance. The production of a device to study the beta decay of107Pd presented special difficulties due to the low specific activity of this isotope (halflife 6.5×106 y), and the low enrichment (15%) that was available. This meant it was necessary to incorporate a large amount of palladium into our tin absorber. We found we could avoid a corresponding increase in heat capacity by forming a superconducting PdSn alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693431
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cryogenic micro-calorimeters for beta spectroscopy: A status report (1992)
    Springer
    Hyperfine interactions 75 (1992), S. 409-414 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Status of efforts to develop a cryogenic micro-calorimeter as a beta spectrometer for 17 keV neutrino searches is given. Experimental requirements are derived. Using NTD germanium thermometry, adequate detector performance (1.5 keV resolution at a base temperature of 130 mK) is demonstrated. Exploration of source deposition and encapsulation is underway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398997
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Search for parity and time reversal violations in hindered gamma-decay (1992)
    Springer
    Hyperfine interactions 75 (1992), S. 189-198 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss various possibilities to improve the sensitivity of parity and time reversal asymmetry measurements in gamma decaying nuclei. We compare the best known parity violating case180mHf to a similar isotope178mHf. Although the parity violation may not be as large, the 178 isomer is better suited to eliminate experimental systematic problems. We introduce a new detector to enhance the sensitivity of such measurements. Our first experiments indicate applicability of these detectors to P symmetry tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398976
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    UNISOR on-line nuclear orientation facility (UNISOR/NOF) (1988)
    Springer
    Hyperfine interactions 43 (1988), S. 151-156 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The UNISOR on-line nuclear orientation facility (UNISOR/NOF) consists of a3He−4He dilution refrigerator on line to the isotope separator. Nuclei are implanted directly into a target foil which is soldered to the bottom accessed cold finger of the refrigerator. A 1.5 T superconducting magnet polarizes the ferromagnetic target foils and determines the axis of symmetry. Up to eight gamma detectors can be positioned around the refrigerator, each 9 cm from the target. A unique feature of this system is that the k=4 term in the directional distribution function can be directly and unambigously deduced so that a single solution for the mixing ratio can be found. The first on-line experiment at this facility reported here was a study of the decay of the191Hg and193Hg isotopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398295
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    Paper (German National Licenses)
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