Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Struktur und Dynamik von Kernen
HK 48.2: Gruppenbericht
Donnerstag, 20. März 2014, 17:00–17:30, HZ 4
Measurements of (p,2p) and (p,pn) quasi-free knockout reactions in inverse kinematics — •Alina Movsesyan1,2 and Valerii Panin1,2 for the R3B collaboration — 1IKP, TU Darmstadt, Deutschland — 2GSI, Darmstadt, Deutschland
We will present results from benchmark experiments dedicated to investigations of nuclear structure with proton-induced quasi-free scattering (QFS) reactions in inverse kinematics at relativistic energies. Kinematically complete measurements were undertaken, making use of the ALADIN/LAND-R3B setup at GSI Darmstadt, which allow for analysis of (p,2p) and (p,pn) reactions. Similar technique with an upgraded setup will be used for the future R3B program at FAIR/GSI, for studies of the single-particle (SP) structure and the role of N-N correlations in very exotic nuclei. One-neutron and one-proton quasi-free knockout reactions on 12C will be presented, followed by heavier, unstable 57Ni nucleus. The QFS signature has been observed by angular correlations of the knocked out nucleon and recoiled target proton. Cross sections for knocking out a proton/neutron from corresponding SP states have been measured. In combination with a reaction theory, they provide information on the reduction of spectroscopic strength for these states. The deduced spectroscopic/reduction factors and the branching between proton knockout from p- and deeper lying s-shells from 12C will be compared to results of (e,e’p), (p,2p) and (d,3He) reactions. The results of 57Ni will be compared to previous findings from knockout reactions on Be target. The work is supported by BMBF, GSI TU Darmstadt Cooperation Contract, HIC for FAIR and NAVI.