O. Shirinda

A DIAMANT Wedding For AFRODITE: Probing Structure and Characterizing Reaction Properties Via Charged‐Particle‐γ Correlations

The DIAMANT‐AFRODITE combination has been used to investigate incomplete fusions reactions via the 13C+170Er entrance channel. The intensity of 176Hf (populated via the α 3n exit channel) is ∼8% of 178W (populated via 5n evaporation) which is ∼8 times stronger than that expected from complete fusion. Moreover, 2αxn exit channels leading to Yb nuclei are observed with intensities that are ∼30‐to‐40% of 176Hf, for which no yield is expected from complete fusion. A comparison of the intensities from the two‐α‐ and one‐α‐gated data is consistent with fragmentation of the 13C beam into (α‐α‐α‐n) which suggests that the population of Yb nuclei results from fusion (or “massive transfer”) of one the break‐up α‐particles. A campaign of measurements is scheduled for late 2007 with further investigations planned for 2008, including the continuation of the study of superdeformation in 32S.The DIAMANT‐AFRODITE combination has been used to investigate incomplete fusions reactions via the 13C+170Er entrance channel. The intensity of 176Hf (populated via the α 3n exit channel) is ∼8% of 178W (populated via 5n evaporation) which is ∼8 times stronger than that expected from complete fusion. Moreover, 2αxn exit channels leading to Yb nuclei are observed with intensities that are ∼30‐to‐40% of 176Hf, for which no yield is expected from complete fusion. A comparison of the intensities from the two‐α‐ and one‐α‐gated data is consistent with fragmentation of the 13C beam into (α‐α‐α‐n) which suggests that the population of Yb nuclei results from fusion (or “massive transfer”) of one the break‐up α‐particles. A campaign of measurements is scheduled for late 2007 with further investigations planned for 2008, including the continuation of the study of superdeformation in 32S.

Population of Metastable States in Stable Hafnium and Ytterbium Nuclei via Beam Break-up

The “Chessboard” section of the DIAMANT charged‐particle array has been coupled with the AFRODITE γ‐ray spectrometer at the iThemba Laboratory for Accelerator Based Sciences. Charged‐particle‐γ‐ray coincidence data were recorded during the bombardment of a 176Yb target with a 13C beam at an energy of 90 MeV. The purpose of the investigation was to study the population of metastable states in hafium nuclei via incomplete fusion reactions in which the beam breaks up due to its α‐cluster character. Of note was the observation of the band based on the Kπ = 16+, T1/2 = 31 year isomer in 178Hf to its 19+ member. Also, decays from the high‐K isomeric states in 174Yb and 176Yb. which were populated via 3αxn channels, indicative of complete break‐up of the 13C beam.

Merger of the DIAMANT light charge particle detector into the AFRODITE data acquisition system

The Chessboard section of the DIAMANT CsI detector array has been merged into the AFRODITE γ‐ray spectrometer acquisition system. The details of the data acquisition merging is explained together with how consistency is maintained and ensured between the two distinct systems.