Application of in-trap α spectroscopy to lifetime measurements with MLLTRAP

Abstract : MLLTRAP is a double Penning-trap designed for high precision mass measurements of exotic nuclei. It was built and commissioned off-line at the Maier-Leibnitz Laboratory (MLL) in Garching and is currently installed at the ALTO facility at IPNO, awaiting online commissioning. A complementary double-trap assembly dedicated to in-trap decay spectroscopy is being studied, in which the central electrode of the second trap has been replaced by an arrangement of four silicon-strip detectors (SSD) set at the trapping potential. By using the well-known buffer-gas cooling technique in the first trap we will be able to deliver a spot-like ion cloud of high purity to the detector trap. The decay products being emitted in-flight and not from an implantation material, we expect to achieve high-resolution decay spectroscopy of the confined ion bunch. In the case of heavy α emitters, α particles can be detected by the in-trap SSD, while conversion electrons are guided very efficiently by the magnetic field to another detector, thus allowing for unperturbed detection of both. In addition, once coupled with a position-sensitive electron detector, this spectroscopic trap will allow for indirect measurements of excited-state lifetimes in the region of heavy and super-heavy nuclei, via a new recoil distance measurement method.
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Submitted on : Thursday, May 30, 2019 - 5:43:10 AM
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P. Chauveau, S. Franchoo, K. Hauschild, J. Ljungvall, A. Lopez-Martens, et al.. Application of in-trap α spectroscopy to lifetime measurements with MLLTRAP. Nucl.Instrum.Meth., 2019, B, ⟨10.1016/j.nimb.2019.04.057⟩. ⟨hal-02144354⟩

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