Seminar Details

Transfer Reaction Studies Using the SHARC and TIGRESS Arrays

Duane Smalley, Colorado School of Mines
Tuesday, November 27, 11:00 AM - Special Seminar
NSCL Lecture Hall

Two multi-nucleon transfer reactions were studied using a 6He beam on a 12C target with the Silicon Highly-segmented Array for Reactions and Coulex (SHARC), a compact charged particle silicon array, and the TRIUMF-ISAC Gamma-Ray Escape Suppressed Spectrometer (TIGRESS), a high-efficiency γ-ray detector, at the TRIUMF/ISAC-II facility. First, the reaction mechanisms of the (6He,4He) twoneutron transfer were studied to determine the dominant mechanism; the one-step simultaneous transfer or the two-step sequential transfer of two-neutrons. Second, the multi-nucleon transfer (6He,8Be) was observed and its reaction mechanism could proceed two ways, by a two-proton transfer or an alpha transfer. The two-neutron and multi-nucleon transfer reactions were analyzed and angular distributions extracted. These angular distributions were then compared to microscopic models investigating the effects of the simultaneous vs. sequential transfer mechanisms. Detailed simulations in GEANT4 were performed of the SHARC array to characterize detector performance. This presentation will discuss the experimental challenges, the results of the data analysis, GEANT4 reaction simulations and interpretation of the results.