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 core-excited isomer in fully-ionized 133Sb has been directly studied for the first time by applying the\ud novel technique of isochronous mass spectrometry at GSI. The neutron-rich nuclides in high charge states\ud were produced by projectile fission of 411 MeVA 238U ions, separated in flight by the fragment separator\ud (FRS) and stored in the isochronous storage ring (ESR). The measured excitation energy is 4.56(10) MeV.\ud The neutral-atom half-life is known to be 17 μs. This is the shortest-lived isomer measured directly with\ud mass spectrometry techniques. The extended in-flight half-life of the bare ions in the ESR, which is due\ud to the exclusion of the strong internal conversion, demonstrates that there should be another nuclear\ud level above that identified from isomer-decay spectroscopy, in support of shell-model calculations. This\ud measurement opens up a new half-life domain for storage-ring measurements

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The Gamma Factory (GF) is an ambitious proposal, currently explored within the CERN Physics Beyond Colliders program, for a source of photons with energies up to ≈400 MeV and photon fluxes (up to ≈1017 photons s−1) exceeding those of the currently available gamma sources by orders of magnitude. The high‐energy (secondary) photons are produced via resonant scattering of the primary laser photons by highly relativistic partially‐stripped ions circulating in the accelerator. The secondary photons are emitted in a narrow cone and the energy of the beam can be monochromatized, down to 10−3–10−6 level, via collimation, at the expense of the photon flux. This paper surveys the new opportunities that may be afforded by the GF in nuclear physics and related fields.

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Storage-ring mass spectrometry was applied to neutron-rich 197 Au projectile fragments. Masses of 181,183 Lu, 185,186 Hf, 187,188 Ta, 191 W, and 192,193 Re nuclei were measured for the first time. The uncertainty of previously known masses of 189,190 W and 195 Os nuclei was improved. Observed irregularities on the smooth two-neutron separation energies for Hf and W isotopes are linked to the collectivity phenomena in the corresponding nuclei.

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