Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 31: Struktur und Dynamik von Kernen
HK 31.8: Vortrag
Dienstag, 5. März 2013, 16:00–16:15, HSZ-301
Investigation of low-energy dipole modes in the heavy deformed nucleus 154Sm via inelastic polarized proton scattering at zero degree * — •Andreas Krugmann1, Dirk Martin1, Peter von Neumann-Cosel1, Norbert Pietralla1, Iryna Poltoratska1, Vladimir Ponomarev1, Atsushi Tamii2, Chihiro Iwamoto3, and Kenichi Yoshida4 — 1Institut für Kernphysik, TU Darmstadt — 2RCNP, Osaka University, Japan — 3Konan University, Japan — 4Niigata University, Japan
Polarized proton scattering has been measured on the heavy deformed nucleus 154Sm at extreme forward angles with 300 MeV protons at RCNP, Osaka. The aim is to investigate the impact of ground state deformation on the properties of the pygmy dipole resonance (PDR) and the spin M1 resonance claimed to show a double-hump structure in heavy deformed nuclei. The (p,p’) cross sections can be decomposed into E1 and M1 parts in two independent ways based either on a multipole decomposition of the cross sections or spin transfer observables [1]. The analysis of polarization transfer observables shows dominant non-spinflip cross sections in the excitation energy region 5-9 MeV with a resonance structure interpreted as the PDR, while the spinflip M1 strength shows a broad distribution between 5 and 10 MeV.
[1] A. Tamii, et al., Phys. Rev. Lett. 107, 062502 (2011).
* This work is supported by the DFG through SFB 634 and NE679/3-1.