Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Struktur und Dynamik von Kernen

HK 13.3: Vortrag

Montag, 19. März 2012, 17:15–17:30, P 4

Exclusive measurements of (p,pX) neutron and proton knockout reactions on ⁵⁷Ni — •Alina Movsesyan — TUD, Schlossgartenstr.9, 64289 Darmstadt, Germany

In this presentation, an exclusive experimental approach for the investigation of the shell structure of exotic nuclei using proton-induced knockout reactions is discussed. The experiment performed at the LAND-R³B facility at GSI allowed for an analysis of (p,2p) as well as for the first time (p,pn) reactions in inverse kinematics from kinematically complete measurements of the incoming and outgoing channels. Hereby, results for one-proton and one-neutron knockout reactions on the radioactive isotope ⁵⁷Ni will be discussed. The quasi-free-knockout character of the reactions was identified event-by-event by the reconstructed angular correlations of the scattered nucleons. Inclusive momentum distributions of the residual ⁵⁶Co and ⁵⁶Ni fragments and corresponding (p,2p) and (p,pn) reaction cross sections were deduced. The experimental setup is also capable to distinguish different reaction channels by observing the gamma decay of excited fragments. Particularly, an analysis of excited ⁵⁶Ni residues was carried out, allowing the separation of different angular momentum states of the knocked-out neutron in the ⁵⁷Ni ground state. The results will be compared to knockout reactions induced by a Be target and to theoretical estimates.

This work is supported by HIC for FAIR and EMMI.