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arXiv · 1710.07106

Combining γ-ray and particle spectroscopy with SONIC@HORUS

S. G. Pickstone·M. Weinert·M. Färber·F. Heim·E. Hoemann·J. Mayer·M. Müscher·S. Prill·P. Scholz·M. Spieker·V. Vielmetter·J. Wilhelmy·A. Zilges
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Abstract

The particle spectrometer SONIC for particle-$γ$ coincidence measurements was commissioned at the Institute for Nuclear Physics in Cologne, Germany. SONIC consists of up to 12 silicon $\mathitΔE$-$E$ telescopes with a total solid angle coverage of 9%, and will complement HORUS, a $γ$-ray spectrometer with 14 HPGe detectors. The combined setup SONIC@HORUS is used to investigate the $γ$-decay behaviour of low-spin states up to the neutron separation threshold excited by light-ion inelastic scattering and transfer reactions using beams provided by a 10 MV FN Tandem accelerator. The particle-$γ$ coincidence method will be presented using data from a $^{92}$Mo(p,p'$γ$) experiment. In a $^{119}$Sn(d,X) experiment, excellent particle identification has been achieved because of the good energy resolution of the silicon detectors of approximately 20 keV. Due to the non-negligible momentum transfer in the reaction, a Doppler correction of the detected $γ$-ray energy has to be performed, using the additional information from measuring the ejectile energy and direction. The high sensitivity of the setup is demonstrated by the results from a $^{94}$Mo(p,p'$γ$) experiment, where small $γ$-decay branching ratios have been deduced.

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S. G. Pickstone, M. Weinert, M. Färber, F. Heim, E. Hoemann, J. Mayer, M. Müscher, S. Prill, P. Scholz, M. Spieker, V. Vielmetter, J. Wilhelmy, A. Zilges. 2017-10-19. Combining γ-ray and particle spectroscopy with SONIC@HORUS. https://doi.org/10.1016/j.nima.2017.09.016

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