Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Struktur und Dynamik von Kernen

HK 11.2: Vortrag

Montag, 17. März 2014, 17:00–17:15, HZ 5

Gamma ray spectroscopy of neutron-rich actinides after multi-nucleon transfer reactions — •Andreas Vogt, Benedikt Birkenbach, Peter Reiter, Herbert Hess, Lars Lewandowski, and Tim Steinbach for the LNL 11.22 collaboration — Institut für Kernphysik, Universität zu Köln

Excited states in neutron-rich Th and U nuclei were investigated after multi-nucleon transfer reactions employing the AGATA demonstrator and PRISMA setup at LNL (INFN, Italy). A primary ¹³⁶Xe beam of 1 GeV hitting a ²³⁸U target was used to produce the nuclei of interest in the actinide region. Beam-like reaction products in the Xe-Ba-region were identified and selected by the PRISMA spectrometer. Kinematic coincidences between the binary reaction products of beam-like and target-like nuclei are detected with an additional MCP detector. Those coincidences allow clean conditions for in-beam γ-ray spectroscopy. Background contributions from excited fission fragments are successfully discriminated. γ-rays from excited states in beam- and target-like particles were measured with the position sensitive AGATA HPGe detectors. Improved energy resolution after Doppler correction is based on the novel γ-ray tracking technique which was successfully exploited to increase the quality of the γ-spectra. γ-ray spectra of the produced beam-like isotopes in the one-proton and two-proton transfer channels will be presented. Corresponding results from the hard-to-reach neutron-rich isotopes beyond ²³²Th will focus on their collective properties and cross section limits for their production. Supported by the German BMBF (05P12PKFNE TP4), ENSAR-TNA03, BCGS.