A Geant4 simulation package for the TASISpec experimental detector setup

Abstract

The experimental detector setup TASISpec (TASCA in Small Image mode Spectroscopy) comprises composite Geand highly segmented Si-detectors. The setup is constructed to provide multi-coincidence spectroscopic data between γ-rays, X-rays, conversion electrons, fission fragments, and α-particles for heavy and superheavy elements (Z ≥ 100).The full array has been virtually constructed using the Geant4 simulation toolkit. The simulations will not only be used to explore the possibilities of the detector setup itself. More important, however, they will also shed light on the nuclear structure of the heaviest elements. This can be done by comparing the simulated detector response of complex decay modes with the experimental data. Such an iterative or 'self-consistent' way to understand experimental observables will provide more reliability when disentangling the data and deducing experimental decay schemes.

Nuclear structure notes on element 115 decay chains

“…A first high-resolution α-photon coincidence experiment was conducted at the gas-filled 'TransActinide Separator and Chemistry Apparatus' (TASCA) at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Here, 30 decay chains were observed [14,17] in less than three weeks in the TASISpec decay station [18,19]. A similar experiment was performed shortly after using the Berkeley gas-filled separator (BGS) at Lawrence Berkeley National Laboratory (LBNL), United States, resulting in 46 element 115 decay chains and more α-photon coincidence events, thereby confirming the TASISpec data [20].…”

“…Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: [19,26] using the proposed decay schemes in panels (e)-(g) as input. The main features of the decay schemes are highlighted in green.…”

“…Figure 1(d) and Table 1) nor energy-time correlations point to more than one decaying state of 288 115. Feeding the proposed decay scheme of 288 115 shown in Figure 2(e) into the comprehensive TASISpec Geant4 simulations [19,26] results in the green-shaded background displayed in Figure 2(a). This normalized green distribution of 10000 simulated decay events is to be compared with the experimental black curve.…”

Quantum-state-selective decay spectroscopy of Ra213

“…A virtual TASISpec setup encoded with the GEANT4 simulation framework [34] is available [35]. Differences between the present so-called "TRAPSpec" (this work) and the full TASISpec setup can easily be accounted for.…”

Superheavy Element Studies with TASCA at GSI: Spectroscopy of Element 115 Decay Chains

“…The first answer is: perform a self-consistency check with detailed and comprehensive Geant4 simulations of TASISpec and the physics interpretation of the observed data [35,36]! This is exemplified in Fig.…”