Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Structure and Dynamics of Nuclei IV
HK 8.2: Talk
Monday, March 10, 2025, 17:15–17:30, HS 3 Physik
Search for near-threshold multi-neutron resonances in neutron-rich nuclei at R3B — •Nikhil Mozumdar1,2, Thomas Aumann1,2,3, Antoine Barriere4, Martina Feijoo-Fontan5, and Olivier Sorlin4 for the R3B collaboration — 1Technische Universität Darmstadt — 2Helmholtz Forschungsakademie Hessen fur FAIR — 3GSI Helmholtz-Zentrum für Schwerionenforschung — 4Grand Accélérateur National d’Ions Lourds — 5Universidade de Santiago de Compostela
In order to constrain the largely unknown multi-neutron interactions, it is necessary to measure the relevant observables sensitive to them. One such property is the possible existence of narrow resonances related to multi-neutron cluster structures and correlations. This can be investigated by studying multi-neutron resonances close to the corresponding neutron removal thresholds in neutron-rich light nuclei. Toward this end, an experiment was performed in the state-of-the-art R3B setup in GSI, within the FAIR Phase-0 program. Quasi-free scattering (p,2p) reactions are studied in inverse kinematics, where a radioactive ion "cocktail" beam is impinged on a 5 cm LH2 target. The complete kinematic information of the resulting reactions is provided by the large combination of detectors in the setup. In this communication, we present a detailed study of the continuum structure of Boron isotopes, with an emphasis on the near-threshold states. This is followed by results of the two-body nn-relative energy distributions corresponding to these resonances. Supported by HFHF, the GSI-TU Darmstadt cooperation and the BMBF project 05P24RD1.
Keywords: Quasi-free scattering; Nuclear structure; Nuclear clustering; Unbound states; Neutron detection