Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Nuclear Astrophysics III
HK 22.5: Talk
Tuesday, March 11, 2025, 17:00–17:15, SR 0.03 Erw. Physik
In-beam gamma-ray spectroscopy of neutron-rich nuclei around the N=20 island of inversion — •Bellona Bles for the e12003 experiment collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — Department of Physics, University of Novi Sad, Novi Sad, Serbia
The ground state wave function of nuclei in the island of inversion at N=20 is dominated by fp instead of sp configurations, contradictory to the normal shell filling observed near stability. At the center of this region is 32Mg with a characteristic intruder ground state, however, the transition into the island of inversion, especially at the northern shore, is still a subject of discussion. Therefore, this work explores the structure of 30−35Al isotopes through in-beam gamma-ray spectroscopy, aiming to provide a consistent picture into the island of inversion. The experiment was performed at NSCL, MSU, using fragmentation reactions to create secondary radioactive cocktail beams of different Mg, Al, Si, and P isotopes. The cocktail beams were guided to the secondary Be target, where nucleon knockout reactions occurred, and the gamma rays were detected with the gamma-ray tracing array GRETINA. The reaction products were further directed toward the S800 spectrograph. From the experimental data, exclusive cross-sections and parallel momentum distributions will be extracted to determine the spectroscopic factors and updated level schemes with firmly assigned spin and parity to states. This talk reports on the status of the analysis and presents the first results on the level schemes of neutron-rich Al isotopes.
Keywords: island of inversion; in-beam gamma spectroscopy; neutron-rich nuclei; knockout reactions; shell model