Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Poster - Struktur und Dynamik von Kernen

HK 56.7: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 4.OG

High-resolution proton scattering off ⁷⁰Zn under extreme forward angles^⋆ — •Andreas Ebert¹, Dirk Martin¹, Peter von Neumann-Cosel¹, Norbert Pietralla¹, and Atsushi Tamii² — ¹Institut für Kernphysik, TU Darmstadt — ²Research Center for Nuclear Physics, Osaka, Japan

A high-resolution scattering experiment was performed with a 295 MeV proton beam at the Research Center of Nuclear Physics in Osaka, Japan. The nucleus ⁷⁰Zn has been measured under scattering angles of 0^∘, 3^∘ and 4.5^∘. From the angular distributions it is possible to distinguish spin-M1 and E1 response [1]. The spin-M1 response is assumed to be affected by the shell evolution due to the tensor force towards the exotic neutron-rich doubly magic nuclei ⁷⁸Ni [2]. The experiments will also provide important information on the evolution of the pygmy dipole resonance with neutron excess by comparison with unstable neutron-rich isotones ⁶⁸Ni discovered recently at GSI [3].

During the analysis procedure, ion optical correction methods, drift time to distance conversion, high-resolution corrections and an energy calibration are applied. After the background subtraction, double differential cross sections can be extracted. And the cross sections will decomposed into M1-response and E1-response.
[1] A. Tamii et. al. Phys. Rev. Lett. 107,062502 (2011).
[2] T. Otsuka Phys. Rev. Lett. 104 (2010) 012501.
[3] O. Wieland et. al. Phys. Rev. Lett. 102 (2009) 092502.
^⋆Supported by DFG through SFB 634 and NE 679/3-1.