Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Struktur und Dynamik von Kernen VII
HK 50.4: Talk
Thursday, March 24, 2011, 15:00–15:15, O-1
Complete electric dipole response in 120Sn from high-resolution polarized proton scattering at 0∘ ⋆ — •Anna Maria Heilmann — Technische Universität Darmstadt
With recent experimental progress at the Research Center of Nuclear Physics in Osaka, Japan [1] intermediate energy polarized proton scattering experiments can be performed at very forward scattering angles and with an energy resolution in the order of Δ E/E ≈ 8 · 10−5. Using this setup a consistent measurement of the dipole modes both above and below the neutron emission threshold is possible. Cross sections in the angle range 0∘−4∘ and observables for the polarization transfer of E1 and M1 excitations in 120Sn were measured for excitation energies of 5−25 MeV. The systematics of the pygmy dipole resonance (PDR) in stable tin isotopes has been studied at the superconducting linear accelerator S-DALINAC in Darmstadt [2]. From this study it was concluded that knowledge of the complete E1 response would be important to differentiate between relativistic an nonrelativistic QRPA models. From the present measurement the whole B(E1) strength distribution and the branching ratios of the PDR to ground state can be extracted. First results on the E1 strength distribution will be presented.
[1] A.Tamii et al., Nucl. Inst. Meth. A 605, 326 (2009).
[2] B.Özel, J.Enders, H.Lenske, P.von Neumann-Cosel, I.Poltoratska, V.Yu.Ponomarev, A.Richter, D.Savran, and N.Tsoneva, arXiv:0901.2443.
⋆ Supported by the DFG through SFB 634 and 446JAP 113/267/0-2.