This paper outlines some of the physics opportunities available with the GSI RISING active stopper and presents preliminary results from an experiment aimed at performing beta-delayed gamma-ray spectroscopic studies in heavy-neutron-rich nuclei produced following the projectile fragmentation of a 1 GeV per nucleon ²⁰⁸Pb primary beam. The energy response of the silicon active stopping detector for both heavy secondary fragments and beta-particles is demonstrated and preliminary results on the decays of neutron-rich Tantalum (Ta) to Tungsten (W) isotopes are presented as examples of the potential of this technique to allow new structural studies in hitherto experimentally unreachable heavy, neutron-rich nuclei. The resulting spectral information inferred from excited states in the tungsten daughter nuclei are compared with results from axially symmetric Hartree–Fock calculations of the nuclear shape and suggest a change in ground state structure for the N = 116 isotone ¹⁹⁰W compared to the lighter isotopes of this element.

This work is supported by the EPSRC and STFC(UK), the EU Access to Large Scale Facilities Programme (EURONS, EU contract 506065), The Spanish Ministerio de Educacion y Ciencia and The German BMBF.

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FIRST RESULTS WITH THE RISING ACTIVE STOPPER

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