H. Daniel

Dasβ-Spektrum des Cs137

Theβ-ray spectrum of Cs137 has been measured with an iron-free spectrometer. The energy of the soft component was found to beE0=514±2 keV. The parameterk of the hard-component shape factorC2VA(2)(W)=q2+kp2 was determined to bek=0.015±0.004. Theβ intensities amount to 6.5% (hard component) and 93.5% (soft component). TheK conversion coefficient of the isomeric transition was measured to beαK=0.093±0.003, in excellent agreement withSlivs theoretical value.

Aufbau eines automatisch arbeitenden π√2-Spektrometers und Untersuchung des Konversionslinienspektrums von In114m und ThB mit Folgeprodukten

An automatically operatedπ√2 spectrometer is described. The regulated current supply is transistorized. With this spectrometer the electron spectra of In114m and of ThB with daughter products have been investigated. TheK/L ratio of the 191 keV isomeric transition in In114m was found to be 1·25±0·03, in excellent agreement with the theoretical value ofSliv andBand. In the electron spectrum of ThB and daughter products 46 lines were found betweenBϱ=1750Г cm andBϱ=10000Г cm. Some of them are new. Most important is a new weak line atBϱ=7030Г cm which fixes a new level atE=1·807 MeV in ThC′ (Po212). Simultaneously the earlier reported discrepancy between electron andγ-ray intensities for 1·8 MeV transition energy is resolved. There is anE0 transition of 1·800 MeV while the new line is theK conversion line of a new radiative transition (most probablyM2). A spin ofI=2+ is assigned to the 1·680 MeV level of ThC′. The 0·953 MeV transition from this level isM1, withE0 admixture.

Das β-Spektrum des In114

The shape of the In114β-spectrum has been measured with a magnetic lens spectrometer. The shape factor was found to be essentially allowed. A least square fit gave the following result for the deviation termb/W:b=(5±2)·10−2 mc2. The stated error is the standard deviation only. This result does not agree with the large deviation reported byLanger et al. Additional information is given for the isomeric transition.

β-Übergang zwischen den Grundzuständen von Co58 und Fe58

The method of ga /sup +/ spectrum of Co/sup 58/ was investigated with a double focusing method of ga spectrometer. A double forbidden transition between the ground states of Co/sup 58/ and Fe/sup 58/ was found with an intensity of approximately 6 x 10/sup -6/ per decay. (tr-auth)ZusammenfassungDas β+-Spektrum des Co58 wurde mit einem doppelfokussierendenβ-Spektrometer untersucht. Es wurde ein zweifach verbotener Übergang zwischen den Grundzuständen von Co58 und Fe58 gefunden, der eine Intensität von etwa 6 · 10−6 pro Zerfall besitzt.