R. Isocrate

A 4π light-charged particle Si detector as a trigger device for in-beam γ-ray spectroscopy

A 4π Si-ball detector system has been constructed as a trigger device for the γ-ray spectrometer GASP. The construction and operation of the detector is reported, together with a brief description of the electronics and of the data acquisition system used. Results are presented for the 32S + 40Ca reaction at 140 MeV of32S beam energy.

Characterization of HPGe-segmented detectors from noise measurements

We suggest that some key physical parameters of high-purity germanium (HPGe) segmented detectors, including segment capacitance and leakage current, can be derived from standard noise measurements. These parameters are relevant when designing and optimizing the front-end electronics.

A 12-channel 14/16-bit 100/125-MS/s digitizer with 24-Gb/s optical output for AGATA/GALILEO

A 12-channel digitizer card with 24 Gb/s optical output and -10 W power consumption is presented, specifically developed for the AGATA and GALILEO germanium array detectors. The card has many useful features, including: differential-input mode, end termination for both differential and common mode components of the input signals, introduction and remotely-controlled regulation of differential DC offset for dynamic range maximization, two remotely selected working ranges, built in test-pattern waveform multiplexed at the analog inputs for precise inter-channel time synchronization, optional interleaved mode for equivalent sampling-frequency multiplication, optional fast channel with remotely controlled threshold comparator working as an analog trigger for ancillary detectors. The card has been conceived for new-generation, highly-segmented, position-sensitive HPGe detectors for nuclear physics experiments, requiring digitization at 100 Ms/s 14bit or better, and is adequate for high-resolution gamma-spectroscopy and gamma-ray tracking.

Performance of the Fully Digital FPGA-Based Front-End Electronics for the GALILEO Array

In this work we present the architecture and results of a fully digital Front End Electronics (FEE) read out system developed for the GALILEO array. The FEE system, developed in collaboration with the Advanced Gamma Tracking Array (AGATA) collaboration, is composed of three main blocks: preamplifiers, digitizers and preprocessing electronics. The slow control system contains a custom Linux driver, a dynamic library and a server implementing network services. This work presents the first results of the digital FEE system coupled with a GALILEO germanium detector, which has demonstrated the capability to achieve an energy resolution of 1.530/00 at an energy of 1.33 MeV, similar to the one obtained with a conventional analog system. While keeping a good performance in terms of energy resolution, digital electronics will allow to instrument the full GALILEO array with a versatile system with high integration and low power consumption and costs.

Planar and aplanar tilted bands in the odd-odd nucleus 132Cs

High-spin states in the doubly odd N = 77 nucleus 132Cs have been studied. Gamma-ray linear polarization and angular correlation measurements have been performed to determine the spin and parity of the states. A rotational sequence of enhanced dipole transitions was established. This band can be described within the framework of the the tilted axis cranking (TAC) model as a band based on a weakly deformed structure in which the total angular momentum vector does not coincide with any of the principal axes of the triaxial nucleus but still is in the plane defined by the short and long axes. The theoretical description of the previously proposed chiral bands in 132Cs was extended in the framework of the core–particle coupling model (CPCM) confirming that the total angular momentum for the πh11/2 ⊗ νh11/2 configuration is well outside any planes defined by the principal axes of the nucleus and revealing the important role of the residual proton–neutron interaction between the valence particles.

Gamma-ray tracking with the MARS detector

Abstract.The feasibility of the entire process of

Development of the control card for the digitizers of the second generation electronics of AGATA

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Gamma-ray Tracking with Segmented HPGe Detectors

-ray tracking is demonstrated experimentally for the first time. The accuracy of the results is tested by the capability for Doppler correction of

Gamma‐ray Tracking With The MARS Detector

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A PCI Express optical link based on low-cost transceivers qualified for radiation hardness

-rays emitted in flight. The resolution of the 847.8 keV (