R3B Collaboration Meeting

Total reaction, charge-changing, and neutron-removal cross sections in neutron-rich Sn isotopes

Reactions of the Borromean two-proton-halo nucleus nucleus 17Ne have been measured in complete kinematics at the R3B/LAND setup at GSI in Darmstadt. The experimental method is based on exclusive measurements of one-proton-removal reactions. Polyethylene (CH_2) and carbon (C) were used as targets. Thus it is possible to reconstruct the pure hydrogen (H) contribution of the CH_2 data by subtracting the carbon background. The resulting events are clean quasi-free-scattering (p,2p) reactions showing the typical angular correlations known from p-p scattering. Thereby quasi-free (p,2p) and carbon-induced one-proton removal reactions have been studied separately and are compared with each other showing the quasi-free-scattering reactions to be a clean tool for nuclear-structure studies. The s²- and d²-configuration in the ground state wave function of 17 Ne is determined with two independent analysis methods for both targets, the C-target and the reconstructed H-target. The first analysis method is based on the invariant mass technique, while the second one is based on the analysis of the transverse momentum distributions. The results obtained using quasi-free scattering reactions are compared to the results from carbon induced reactions.

Heavy Ion Tracking in the S412 Experiment

We report on the status of the SOFIA set-up with the aim of anticipating the D0 experiment. The goals of the SOFIA experiment, the method used and the summary of the different measurements will be briefly presented. We will mainly focus on the technical achievements from, first, the short 2014 beam time at cave C, and second during the most recent detectors test performed at the FRS in June and July 2016.

Quasi-free (p,2p) and (p,pn) simulations

In this talk NUSTAR and its present status will be presented.

Short outlook on the beamtime block 2018.

I will discuss recent studies of Short-Range Correlations using Hard knockout Reactions. Various aspects of the measurement and the interpretation of the data with the discussed and new results will be presented.

really needed?

I'll report on a new approach to extract the neutrons multiplicity in Fission in R3B experiment when both fission fragments are indentified in Z and A

Proposal for experiment in 2018. Discrepancy found in existing data, should urgently be settled.

The 12C(a,g)16O is of great importance in astrophysics but due to its small cross section a direct measurement is very difficult or even impossible. The Coulomb dissociation method could be an alternative method to gain further information and constrain the rate at the astrophysical interesting region.

proposal, see file sent to Heiko and Tom

In this talk I will present a project to build a Time Projection Chamber (TPC) to fit inside the gap of GLAD dipole magnet. This will allow benefiting of the bending power of GLAD for rigidity measurement of charged particles. To maximize the acceptance, the target will be placed at the entrance of the TPC chamber. I will present a design combining a thick liquid hydrogen target to the TPC. The capability of measuring high-energy charged particles will be particularly interesting for experiments implying high energies of the beam, and therefore of the ejectiles, beyond the detection threshold of CALIFA array. This will be the case, for example, of short-range correlations studies, that demand beam energies above 1 GeV/u.

We discuss our proposal to study fisison properties and fission barriers using the (p,2p) reaction.

It is proposed to study the fission process in the region of neutron-deficient nuclides of masses 210 to 180 using the updated R3B/SOFIA setup. Secondary beams produced by the FRS will undergo fission by Coulomb excitation, and fission fragments will be identified in mass and charge, allowing to map and characterize the transition toward a new mode of fission.