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Caballero, M., Sanchez-Tembleque, V., Fraile, L. M., Fonseca-Vargas, C., Gaitan, S., Kim, H. J., et al. (2026). Time response of an undoped LaCl3 crystal. Radiat. Phys. Chem., 239, 113239–7pp.
Abstract: We have characterized a detector equipped with an undoped LaCl3 truncated cone crystal with dimensions of 22.5 mm in the largest diameter, 16 mm in the smallest diameter, and 16 mm in height, coupled to a fast Photonis XP2020/URQ photomultiplier tube (PMT). Its time response at 511 keV (Na-22) and Co-60 photon energies has been measured against a reference detector using a fast digitizer module by digital signal processing methods based on a genetic algorithm. The time resolution was optimized by the choice of the photomultiplier bias voltage and the fine-tuning of the digital parameters of the time pickup algorithm. The de-convoluted full width at half maximum (FWHM) time resolution is found to be 250 +/- 10 ps at Co-60 energies, and 444 +/- 8 ps using positron annihilation gamma-rays from 22Na, providing good prospects for the use of the crystal in applications requiring a fast time response.
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Moon, B. et al, & Morales, A. I. (2026). Commissioning and performance of IDATEN: A large fast-timing γ-ray detector array at the RIBF. Nucl. Instrum. Methods Phys. Res. A, 1084, 171239–7pp.
Abstract: A large fast-timing 1-ray detector array has been newly developed under the International Detector Assembly for fast-Timing measurements of Exotic Nuclei (IDATEN) project. The full IDATEN array comprises 82 LaBr3(Ce) 1-ray detectors, of which 46 and 36 are provided by the KHALA and FATIMA collaborations, respectively. To assess the fast-timing performance of this large-scale system with stopped rare-isotope beams, a commissioning experiment was recently carried out at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. Neutron-deficient rare isotopes near 100Sn were produced via in-flight fragmentation of a 124Xe primary beam. The fast-timing capability was evaluated using 96Pd as the reference nucleus by measuring the half-lives of the 2+1 , 4+1 and 6+1 levels, which were populated through the decay of the long-lived 8+1 isomeric state. These results demonstrate the reliability of our experimental setup, including the readout electronics and data acquisition system, thereby validating its readiness for forthcoming physics experiments at the RIBF. Moreover, the measured half-life values are in agreement with previously reported literature values, with some determinations achieving improved precision.
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