Abstract
Nuclides that are considered to be isotopes of element Z = 115 were produced in the reaction 48 Ca + 243 Am at the GSI Helmholtzzentrum fur Schwerionenforschung Darmstadt. The detector setup TASISpec was used. It was mounted behind the gas-filled separator TASCA. Thirty correlated -decay chains were found, and the energies of the particles were determined with high precision. Two important spectroscopic aspects of the o line data analysis are discussed in detail: the handling of digitized preamplified signals from the silicon strip detectors, and the energy reconstruction of particles escaping to upstream detectors relying on pixel-by-pixel dead-layer thicknesses.
Highlights
1 Introduction In November 2012, the TASISpec setup [1] was employed in an experiment aiming at detailed spectroscopic studies of superheavy elements occurring in decay chains originating from the fusionevaporation reaction 48Ca + 243Am
TASISpec comprises five double-sided silicon strip detectors (DSSSDs) in the shape of a box with one side left open for incoming ions
To optimize DSSSD energy resolution from pulse shapes stored during a superheavy element spectroscopy experiment, a specific moving window deconvolution (MWD) algorithm fine-tuned with individually optimized decay constants was worked out
Summary
In November 2012, the TASISpec setup [1] was employed in an experiment aiming at detailed spectroscopic studies of superheavy elements occurring in decay chains originating from the fusionevaporation reaction 48Ca + 243Am. The nuclei of interest are separated from the primary beam and guided to the setup using the TASCA separator [2,3,4], and implanted into the central DSSSD (’implantation detector’) Their subsequent charged-particle decays are detected in it and the surrounding silicon detectors (’upstream detectors’). During 18 days of beam time, 30 correlated alpha decay chains were detected [5] Their α-decay characteristics are by and large consistent with previously published data on element 115 chains [6]. The methods used in processing the pulse shapes, the methods used for pixel-by-pixel determination of the dead layer, and the routine for reconstructing the energy of the decay when it is split between the implantation detector and an upstream detector, are described
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