Influence of energy summing of α-particles and conversion electrons on the shapes of α-spectra in the region of the heaviest nuclei

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Abstract

Measured α-decay spectra of the isotopes 215Th and 213Ra were used to investigate the influence of energy summing of α-particles and conversion electrons, and Auger electrons, respectively, emitted after α-decays into excited daughter levels, on the shape of α-spectra. The isotopes were produced in heavy ion fusion reactions and were implanted into silicon surface barrier detectors after in-flight separation from the projectile beam. It was shown that the summing effects will cause (a) the occurrence of additional lines in the α-energy spectra and (b) a change in the relative intensities of α-lines belonging to the α-decay pattern of a certain isotope. The results for 215Th and 213Ra are used for a discussion of the α-decay properties of the isotope 255104 and its α-decay products 251No and 247Fm. Especially the large discrepancies of the α-energies of 247Fm measured in our experiments and literature values are interpreted as due to a summing between α and electron energies.

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