Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Structure and Dynamics of Nuclei IV

HK 24.2: Talk

Tuesday, February 27, 2018, 17:00–17:15, HZO 70

Investigation of the 2n system by quasi-free α-knockout from ⁶He — •Marco Alexander Knösel, Thomas Aumann, Fabia Schindler, and Vadim Wagner for the NeuLAND-SAMURAI collaboration — Technische Universität Darmstadt

The investigation of pure neutron systems has been a long-lasting goal in nuclear physics. State-of-the-art nuclear theories agree that light neutron clusters do not form bound states but struggle to handle the resonant case. Experimental information on these systems are of great importance but still scarce. An experiment to study the properties of both the 4n and the 2n system was performed at the SAMURAI setup at RIKEN, using the reactions ⁸He(p,pα)4n and ⁶He(p,pα)2n, respectively. This contribution will focus on the latter case. To investigate the n-n scattering system, the α-knockout reaction has been performed in inverse kinematics using a radioactive ⁶He-beam and a liquid hydrogen target. As a result of the α-knockout the binding potential vanishes to let the neutrons interact only with each other at low relative energies. The combination of the neutron detector NEBULA (SAMURAI) and the NeuLAND demonstrator (for R3B at GSI/FAIR) allows for a kinematically complete measurement with a high neutron detection efficiency. Consequently, the dineutron relative-energy distribution can be determined and information on the the scattering length can be extracted by both the missing mass method and by measurement of the invariant mass of the 2n system. This work is supported by the DFG through grant no. SFB 1245, the BMBF under contract number 05P15RDFN1 and the GSI-TU Darmstadt cooperation agreement.