Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Structure and Dynamics of Nuclei VIII

HK 40.6: Vortrag

Mittwoch, 28. Februar 2018, 18:00–18:15, HZO 70

Study of the Pygmy Dipole Resonance in ⁶⁴Ni via particle −γ coincidence measurements — •Johann Isaak for the CAGRA collaboration — Research Center for Nuclear Physics, Osaka Univ., Japan

The low-energy part of the electric dipole response in the region of the Pygmy Dipole Resonance (PDR) [1] is studied in the rare nickel isotope ⁶⁴Ni via inelastic proton and α-scattering with subsequent γ spectroscopy of the decay channel. The aim is to determine the full dipole strength distribution to fill the gap between existing data on the stable isotopes ^58,60Ni [2,3] and the unstable ⁶⁸Ni [4] for the systematic investigation of the PDR as a function of the neutron-to-proton ratio. The energy loss of inelastically scattered protons and α particles were measured using the high-resolution magnetic Grand Raiden spectrometer at RCNP [5]. In coincidence, γ rays emitted from the target nuclei were detected by the γ-ray detector array CAGRA, which consisted of 12 Clover detectors and 4 LaBr₃ scintillators. The recent status of the data analysis and preliminary results will be presented.

[1] D. Savran, T. Aumann and A. Zilges, PPNP 70 (2013) 210.

[2] M. Scheck et al., PRC 87 (2013) 051304(R).

[3] M. Scheck et al., PRC 88 (2013) 044304.

[4] D. Rossi et al., PRL 111 (2013) 242503.

[5] M. Fujiwara et al., NIM A 422 (1999) 484.