[en] By using the fusion-evaporation reaction ²⁸Si(³⁶Ar,p3n) and spectroscopy of β-delayed γ rays and charged particles on mass-separated sources, β-decay properties of the neutron-deficient isotope ⁶⁰Ga were studied for the first time. The half-life of ⁶⁰Ga was determined to be 70(15) ms, and, based on β_γγ coincidences, the isobaric-analogue state in ⁶⁰Zn was identified at 4851.9(7) keV. A semiempirical proton separation energy value of 70(70) keV was deduced for ⁶⁰Ga. The experimental results on half-life, mass excess, proton separation energy, and structure of the ⁶⁰Zn daughter states are discussed in comparison with various model predictions, including large scale shell model calculations. (orig.)

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[en] The high-spin investigation of ⁵²Fe (N=Z=26) presents a particular difficulty due to the presence of a 12⁺ isomer, with T_1/2=45.9(6) s which acts as a ''trap'' for the de-exciting γ-ray flux. In this contribution we present results from our investigations on the γ and β decays of the 12⁺ isomer performed at the GSI on-line mass separator. The excitation energy and precise γ-de-excitation branching ratios per parent decay have been established and are compared with the large-scale shell-model calculations performed with the KB3G and FPD6 interactions. (orig.)

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[en] The internal ionization accompanying the first-forbidden unique electron-capture decay of ⁴¹Ca was investigated. The integrated probability of electron ejection with energy greater than 38 keV was found to be (0.17±0.02) x 10^-5 per K-capture. In this energy range, the measured spectrum of ejected electrons is fairly close to predictions of the simple theory of Primakoff and Porter, and of the relativistic theory of Mukoyama et al. By a model-dependent extrapolation of this spectrum toward low energies, the total probability of internal ionization in ⁴¹Ca was estimated and compared with relevant experimental results for other isotopes. (orig.)

[en] The decay of extremely neutron-deficient isotope ⁴⁵Fe has been studied by using a new type of gaseous detector in which a technique of optical imaging is used to record tracks of charged particles. The two-proton radioactivity and the β-decay channels accompanied by proton(s) emission were clearly identified. For the first time, the angular and energy correlations between two protons emitted from the ⁴⁵Fe ground-state were measured. The obtained distributions were confronted with predictions of a three-body model. Studies of β-decay channels of ⁴⁵Fe provided first unambiguous evidence for the β-delayed three proton emission. (author)

[en] Short note. 6 refs

[en] The second forbidden unique β⁺ decay of ⁵⁴Mn has been investigated. An upper limit of 1.4 x 10^-7 for theβ⁺ branching ratio was achieved. This corresponds to the lower limit of 6.1 x 10⁶ years for the partial half-life and value of 12.8 for the lower limit of logft of this second forbidden unique transition. 3 figs., 6 refs. (author)

[en] The β decay of ⁵⁸Cu has been studied by means of total absorption γ-ray spectroscopy. The β feeding to the ⁵⁸Ni states has been measured, and the strength of the ⁵⁸Cu(1⁺) → ⁵⁸Ni(0⁺) Gamow-Teller transition has been determined with improved accuracy. (orig.)