Abstract:Using the high-resolution performance of the fragment separator FRS at GSI we have discovered 60 new neutron-rich isotopes in the atomic number range of 60⩽Z⩽78. The new isotopes were unambiguously identified in reactions with a ²³⁸U beam impinging on a Be target at 1 GeV/nucleon. The production cross-section for the new isotopes have been measured down to the pico-barn level and compared with predictions of different model calculations. For elements above hafnium fragmentation is the dominant reaction mechanism which creates the new isotopes, whereas fission plays a dominant role for the production of the new isotopes up to thulium

The electron-ion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the international Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented.

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The g factors of 31,32,33 Al have been measured using the β-nuclear magnetic resonance (β-NMR) technique on spin-polarized beams produced in the fragmentation of a 36 S (77.5 MeV/u) beam on a 9 Be target. Nearly pure beams of Al (Z = 13) isotopes were selected with the highresolution fragment separator LISE at GANIL. An asymmetry as high as 6% has been observed in the β-NMR curve for 32 Al implanted in a Si single crystal. The magnetic moment of the N = 20 nucleus 33 Al is obtained for the first time: μ( 33 Al, I π = 5/2 + ) = 4.088(5)μ N , while those of 31,32 Al are obtained with improved accuracy: μ( 31 Al, I π = 5/2 + ) = 3.830(5)μ N and μ( 32 Al, I π = 1 + ) = 1.9516(22)μ N . Comparison of the results to shell-model calculations in the sd and the sdpf shell-model spaces leads to the conclusion that 33 Al must contain some contribution from 2p-2h intruder configurations in its ground-state wave function. This indicates a gradual transition from the normal sd shell Si (Z = 14) isotopes to the intruder Mg (Z = 12) isotopes.

SOFIA (Study On FIssion with Aladin) is an innovative experimental programme on nuclear fission carried out at GSI. In August 2012, we used relativistic secondary beams of neutron-deficient actinides and pre-actinides provided by the FRS and studied their fission, induced by electromagnetic interaction, in inverse kinematics. This experiment will provide for the first time complete isotopic yields (nuclear charge and mass) for both fragments over a broad range of fissioning nuclei from 238 Np down to 183 Hg. In this article, we discuss the experimental set-up and present promising preliminary results.

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SOFIA (Studies On Fission with Aladin) is a novel experimental program, dedicated to accurate measurements of fission-fragment isotopic yields. The setup allows us to fully identify, in nuclear charge and mass, both fission fragments in coincidence for the whole fission-fragment range. It was installed at the GSI facility (Darmstadt), to benefit from the relativistic heavy-ion beams available there, and thus to use inverse kinematics. This paper reports on fission yields obtained in electromagnetically induced fission of 238 U.

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