Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 72: Nuclear Structure and Dynamics II

HK 72.2: Talk

Thursday, March 19, 2009, 17:00–17:15, H-ZO 50

Quasi-free Scattering in Inverse Kinematics with the Proton-Dripline Nucleus ¹⁷Ne — •Felix Wamers — Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany

¹⁷Ne is a proton-dripline nucleus that has raised special interest in nuclear structure physics in recent years. It has a half life of 109.2 ms and a low two-proton separation energy of 950 keV. It’s a (¹⁵O-p-p) 3-body borromean system, i.e. all its 2-body subsystems (p-p, ¹⁶F-p) are unbound. ¹⁷Ne is considered to be a potential 2-proton-halo nucleus, yet lacking final and concluding experimental evidence about its structure.
The S318-LAND collaboration has studied reactions of 500 AMeV ¹⁷Ne secondary beams at GSI. One focus was put on employing quasi-free scattering in inverse kinematics at these relativistic energies. In other words, the ¹⁷Ne(p,2p)¹⁶F→¹⁵O+p proton knockout reaction on hydrogen atoms in a paraffin (CH₂) target was studied with a kinematically complete measurement. Recoil protons have been detected with Si-Strip detectors and the surrounding 4 π NaI spectrometer “Crystal Ball”.
In a preliminary analysis, events with ¹⁷Ne and ¹⁵O in initial and final state, respectively, together with 2 coincident protons in the Crystal Ball have been observed. Angular and energy correlations of these scattered protons have been obtained and will be discussed.