Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Structure and Dynamics of Nuclei 4
HK 17.1: Gruppenbericht
Montag, 23. März 2015, 17:00–17:30, T/SR14
Sensitive lifetime measurement of excited states of low-abundant isotopes via the (p,p′γ) reaction — •Andreas Hennig1, Vera Derya1, Milena N. Mineva2, Pavel Petkov1,2, Simon G. Pickstone1, Mark Spieker1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2INRNE, Bulgarian Academy of Sciences, Sofia
Absolute transition matrix elements are valuable observables in nuclear-structure physics since they are directly related to the nuclear wave functions. A key ingredient to determine transition matrix elements is the measurement of lifetimes of excited states. In a recent experiment, we extracted the lifetimes of 30 excited states of the low-abundant isotope 96Ru utilizing the Doppler-shift attenuation method (DSAM) in an inelastic proton-scattering experiment and taking advantage of the proton-γ coincidence technique [1]. In contrast to the DSAM technique following inelastic neutron scattering [2], which was frequently performed to extract comprehensive lifetime information in the sub-picosecond regime, the (p,p′γ) reaction requires a much less amount of target material and is thus especially suited to investigate low-abundant isotopes. In this contribution, the (p,p′γ) method for lifetime measurements is presented and the results of recent experiments on 96Ru, 94Zr, and 112,114Sn are shown. Supported by the DFG (ZI-510/4-2) and the Bulgarian Science Fund (DFNI-E 01/2).
[1] A. Hennig et al., Phys. Rev. C 90 (2014) 051302(R)
[2] T. Belgya et al., Nucl. Phys. A 607 (1996) 43