Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Structure and Dynamics of Nuclei IX

HK 46.6: Talk

Thursday, April 2, 2020, 15:30–15:45, J-HS H

Precise measurement of the neutron-neutron scattering length — •Marco Knösel¹ and Thomas Aumann^1,2 for the NeuLAND-SAMURAI collaboration — ¹Technische Universität Darmstadt — ²GSI Helmholtz-Zentrum für Schwerionenforschung

In this contribution, a new experimental approach to determine the neutron-neutron scattering length is presented. In order to create free neutron pairs, the knockout reactions ⁶He(p,pα)²n and t(p,2p)²n as well as the charge-exchange reaction d(⁷Li,⁷Be)²n are proposed to be measured in inverse kinematics at the RIBF in RIKEN. In a kinematically complete measurement, the momenta and positions of the neutrons are determined using the new high-resolution neutron detector HIME, after they freely scattered off each other. From this information, the spectrum of relative energy of the two-neutron system can be obtained and by comparison to halo EFT calculations the neutron-neutron scattering length can be determined.

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.