Combining γ-ray and particle spectroscopy with SONIC@HORUS

Abstract

The particle spectrometer SONIC for particle-$\gamma$ coincidence measurements was commissioned at the Institute for Nuclear Physics in Cologne, Germany. SONIC consists of up to 12 silicon $\Delta E$-$E$ telescopes with a total solid angle coverage of 9%, and will complement HORUS, a $\gamma$-ray spectrometer with 14 HPGe detectors. The combined setup SONIC@HORUS is used to investigate the $\gamma$-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-$\gamma$ coincidence method will be presented using data from a ${}^{92}$Mo(p,p'$\gamma$) 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 $\gamma$-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'$\gamma$) experiment, where small $\gamma$-decay branching ratios have been deduced.

References in corpus (7)

• Exotic modes of excitation in atomic nuclei far from stability
• Isospin Character of the Pygmy Dipole Resonance in 124Sn
• The gamma-ray spectrometer HORUS and its applications for nuclear astrophysics
• Experimental constraints on the $\gamma$-ray strength function in ${}^{90}$Zr using partial cross sections of the ${}^{89}$Y(p,$\gamma$)${}^{90}$Zr reaction
• Investigation of the reaction 74Ge(p,gamma)75As using the in-beam method to improve reaction network predictions for p nuclei
• Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones
• Lifetime measurement of excited low-spin states via the $(p,p^{\prime }\gamma$) reaction

Cited by in corpus (2)

• Experimental techniques to study the $\gamma$ process for nuclear astrophysics at the Cologne accelerator laboratory
• Efficient determination of HPGe γ-ray efficiencies at high energies with ready-to-use simulation software