Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 66: Structure and Dynamics of Nuclei 13

HK 66.4: Talk

Thursday, March 26, 2015, 17:45–18:00, T/SR19

Gamma-ray spectroscopy of neutron-rich actinides after multi-nucleon transfer reactions — •Andreas Vogt¹, Benedikt Birkenbach¹, Lorenzo Corradi², Peter Reiter¹, and Suzana Szilner³ for the LNL 11.22 collaboration — ¹IKP, Universität zu Köln — ²INFN - LNL, Italy — ³IRB Zagreb, Croatia

Excited states in neutron-rich actinide Th and U nuclei were investigated after multi-nucleon transfer reactions employing the AGATA demonstrator and PRISMA setup at LNL (INFN, Italy). A primary 1 GeV ¹³⁶Xe beam hitting a ²³⁸U target was used to produce the nuclei of interest in the actinide region. Beam-like reaction products in the Xe-region were identified and selected by the magnetic spectrometer PRISMA. Hence, fission fragments can be discriminated against surviving nuclei, DANTE-MCPs were installed within the target chamber to exploit kinematic coincidences between the binary reaction products which allows for clean conditions for in-beam γ-ray spectroscopy. Coincident γ-rays from excited states in beam- and target-like particles were measured with the position-sensitive AGATA HPGe detectors. An improved Doppler correction for both beam- and target-like nuclei is based on the novel γ-ray tracking technique. An extension of the ground-state rotational band in ²⁴⁰U and insights into n-rich Th isotopes were achieved. Based on relative cross-section distributions for various reaction channels, perspectives and limitations for the production of the hard-to-reach neutron-rich isotopes with this experimental method will be presented. Supported by the German BMBF (05P12PKFNE TP4), ENSAR-TNA03, BCGS.