arXiv subjects

B. Gongora Servin

Publications and source records attributed to B. Gongora Servin.

3 recordsLinked to original sources

arXiv2026

A modular datalogger and slow-control platform for physics experiments with time-series telemetry and web dashboards

We present a NIM 2U slow-control system designed for continuous monitoring of environmental and facility parameters during data taking in nuclear-physics experiments. The architecture integrates a base controller board with eight channels for PT100/PT1000 probes and up to three plug-in extension boards, each providing SMA connections on the front panel. All boards adopt a 16-bit SAR ADC (AD7689) with an external 2.5 V reference, yielding an LSB of 38.15 microV and ensuring metrological uniformity across heterogeneous channel types. The operating range for PT100/PT1000 probes spans -200 degrees C to 300 degrees C, with a design accuracy at the 1% level. The system includes modules dedicated to standard industrial signals 4-20 mA and 0-10 V (manual per-channel selection) and a module for current measurement in the 10 nA-150 microA range with automatic gain-range selection. The software chain publishes time series to Graphite and provides visualization through Grafana over Ethernet. Representative performance measurements are reported for the RTD and Current Reader chains, including long-term stability tests with reference elements and calibration measurements over the operating range. A complete metrological characterization of all industrial input configurations remains part of future work.

physics.ins-det↗

arXiv2025

Fusion of 12C+28Si at deep sub-barrier energies

The existence of fusion hindrance is not well established in light heavy-ion systems. Studying slightly heavier cases allows extrapolating the trend to light systems of astrophysical interest. Fusion of 12C + 28Si has been measured down to deep sub-barrier energies, using 28Si beams from the XTU Tandem accelerator of LNL on thin 12C targets. The fusion-evaporation residues were detected by a detector telescope following an electrostatic beam separator, and coincidences between the gamma-ray array AGATA and segmented silicon detectors DSSD were performed, where the evaporated light charged particles were identified by pulse shape analysis. Fusion cross sections have been obtained in the wide range 150 mb-42 nb. Coupled-channel (CC) calculations using a Woods-Saxon potential reproduce the data above 0.1 mb. Below that, hindrance shows up and the CC results overestimate the cross sections which get close to the one-dimensional potential tunnelling limit. This suggests that the coupling strengths gradually vanish, as predicted by the adiabatic model. The hindrance threshold follows a recently updated phenomenological systematics.

nucl-ex↗

arXiv2024

Clarifying the Radiative Decay of the Hoyle State with Charged-Particle Spectroscopy

A detailed knowledge of the decay properties of the so called Hoyle state in the $^{12}$C nucleus ($E_x=7.654$ MeV, $0^+$) is required to calculate the rate at which carbon is forged in typical red-giant stars. This paper reports on a new almost background-free measurement of the radiative decay branching ratio of the Hoyle state using advanced charged particle coincidence techniques. The exploitation, for the first time in a similar experiment, of a bidimensional map of the coincidence efficiency allows to reach an unitary value and, consequently, to strongly reduce sources of systematic uncertainties. The present results suggest a value of the radiative branching ratio of $Γ_{rad}/Γ_{tot}=4.2(6)\cdot10^{-4}$. This finding helps to resolve the tension between recent data published in the literature.

nucl-ex↗