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Abstract |
Neutron-rich isotopes far from stability were produced and observed at the projectile Fragment Separator (FRS) of the GSI Helmholtzzentrum f & uuml;r Schwerionenforschung in the FAIR Phase-0 experimental program. The isotopes were produced in April 2020 in the fragmentation of a 1.05 GeV/nucleon 208Pb beam on a beryllium target. The experiment targeted the neutron-rich region near the N = 126 shell closure, a key area for understanding the astrophysical r-process, but largely unexplored due to the experimental challenges in producing such exotic nuclei. Within this work, we identified five isotopes which were not seen previously at FRS; 184Tm, 195Ta, 198W, 200Re, and 201Re – the latter located directly on the N = 126 line. These observations corroborate the extension of the nuclear chart and highlight the capabilities of the FRS and of in-flight fragmentation at relativistic energies in accessing this region. |
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Address |
[Pietri, S.; Rosch-Kabadayi, H. a.; Dickel, T.; Haettner, E.; Hornung, C.; Kostyleva, D.; Plass, W. R.; Weick, H.; Wirtz, J.; Zhao, J.; Albers, H. M.; Amanbayev, D.; Bagchi, S.; Beck, S.; Geissel, H.; Greiner, F.; Kelic-Heil, A.; Kindler, B.; Kuzuminchuk, N.; Lommel, B.; Mistry, A.; Mollaebrahimi, A.; Mukha, I.; Munzenberg, G.; Purushotaman, S.; Scheidenberger, C.; Simon, H.; Tanaka, Y. K.; Tornqvist, H.; Winfield, J. S.; Winkler, M.] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany, Email: S.Pietri@gsi.de; |
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