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Conley, A. L; Kelly, B; Spieker, M; Aggarwal, R; Ajayi, S; Baby, L. T; Baker, S; Benetti, C; Conroy, I; Cottle, P. D; D`Amato, I. B; DeRosa, P; Esparza, J; Genty, S; Hanselman, K; Hay, I; Heinze, M; Houlihan, D; Khawaja, M. I; Kielb, P. S; Kuchera, A. N; McCann, G. W; Morelock, A. B; Lopez-Saavedra, E; Renom, R; Riley, L. A; Ryan, G; Sandrik, A; Sitaraman, V; Temanson, E; Wheeler, M; Wibisono, C; Wiedenhöver, I
11/2023Journal Article
We report on a highly selective experimental setup for particle-$\gamma$ coincidence experiments at the Super-Enge Split-Pole Spectrograph (SE-SPS) of the John D. Fox Superconducting Linear Accelerator Laboratory at Florida State University (FSU) using fast CeBr$_3$ scintillators for $\gamma$-ray detection. Specifically, we report on the results of characterization tests for the first five CeBr$_3$ scintillation detectors of the CeBr$_3$ Array (CeBrA) with respect to energy resolution and timing characteristics. We also present results from the first particle-$\gamma$ coincidence experiments successfully performed with the CeBrA demonstrator and the FSU SE-SPS. We show that with the new setup, $\gamma$-decay branching ratios and particle-$\gamma$ angular correlations can be measured very selectively using narrow excitation energy gates, which are possible thanks to the excellent particle energy resolution of the SE-SPS. In addition, we highlight that nuclear level lifetimes in the nanoseconds regime can be determined by measuring the time difference between particle detection with the SE-SPS focal-plane scintillator and $\gamma$-ray detection with the fast CeBrA detectors. Selective excitation energy gates with the SE-SPS exclude any feeding contributions to these lifetimes.
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