The coalescence of a binary system of neutron stars represents a natural laboratory to study hot and ultra-dense matter. Under these extreme conditions, exotic species like hyperons may be present. In this work, we present a comprehensive study of hyperons in neutron star mergers, focusing on the thermal impact they have on the Equation of State. The presence of the hyperons in a hot dense...
Neural Quantum States are at the basis of a new ab-initio method especially designed to tackle the quantum many-body problem. These combine the variational method with neural networks, a flagship tool of modern Machine Learning. Neural Quantum States have been successfully used in spin, electronic and nuclear many-body systems. Neural networks can provide an unbiased approximation of complex...
SALSA, SAlamanca Lyso-based Scanning Array, es un sistema de caracterización de cápsulas del espectrómetro AGATA, con el que se busca conseguir una base de datos experimental que relacione las posiciones de interacción de la radiación en el cristal con la forma de los pulsos que éstas generan. Para optimizar el método de caracterización, se ha realizado una simulación en la que se estudian...
The MOdular Neutron time-of-flight SpectromeTER (MONSTER) was originally conceived within the FAIR-NUSTAR collaboration for the measurement of the energy distribution of $\beta$-delayed neutrons with the TOF technique. $\beta$-delayed neutron emission plays an important role in fields like nuclear technology, structure, and astrophysics. In addition to its original purpose, MONSTER can also be...
We analyze the $^{28}$Si nucleus using state-of-the-art numerical shell model calculations [1] as well as the generator-coordinate method (GCM) with quadrupole constrained Hartree-Fock-Bogoliubov (HFB) wavefunctions [2]. Experimentally, $^{28}$Si presents shape coexistence between the oblate ground state and an excited prolate structure [3]. Although the standard USDB interaction reproduces...
The study of cosmic rays, originating from various sources including the Sun and beyond, remains a field with unanswered questions. To probe these high-energy particles, Extensive Air Showers (EAS) generated by cosmic ray interactions with Earth's atmosphere are analyzed. This paper introduces the miniTRASGO cosmic ray telescope, a portable detector employing Resistive Plate Chambers (RPCs)...
The n_TOF Collaboration operates the neutron time-of-flight facility at CERN [1]. The neutron source consists of a lead target irradiated by a 20 GeV/c pulsed proton beam. It comprises two experimental areas, EAR1 [2], located at 185 m from the spallation target, and EAR2 [3], located at 20 m above the target.
During CERN’s second long shutdown (2019-2020), the facility went through a...
David Rodríguez García on behalf of DESPEC collaboration
Our understanding of the production of the heaviest elements in the Universe is still incomplete. In particular the contribution of the rapid neutron capture (r-) process to the observed abundances of elements with A>180 and the astrophysical site for this process is uncertain. Combining astronomical observations (including...
The study of transfer reactions involving weakly bound exotic nuclei is an active field due to the recent advances in radioactive beam facilities. Many of these weakly bound nuclei can be approximately described by a model consisting of an inert core and one or more nucleons. However, for some of these nuclei deformation is especially relevant and should be included in the structure models.
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The need for elemental analysis of helium has recently increased dramatically due to the introduction of several novel applications of He implantation, e.g. in materials of future fusion reactors [1] and in optical waveguides [2, 3]. Proton elastic backscattering spectrometry (p-EBS) is a basic method for depth profiling of helium [4, 5]. Ion beam analysis methods strongly rely on the...
Rapid neutron capture nucleosynthesis (the r-process) produces nearly half of the nuclei heavier than iron in explosive stellar scenarios.
The solar system r-process residual abundances show two peaks located at $A\sim 130$ and $A\sim 195$. Between these peaks lies the Rare-Earth Peak (REP), a distinct but small peak at mass number $A\sim 160$ that arises from the freeze-out during the final...
Nucleosynthesis in explosive hydrogen burning at high temperatures (T$\ > 10^8$ K) is characterized mainly by the rapid proton capture rp-process. One of the possible sites for the rp-process are Type I X-ray bursts (XRBs). Several N=Z nuclei, such as ${}^{64}$Ge, act as waiting points in the nuclear flow. The beta decays of these waiting points are needed in theoretical modeling for...
Neutrons are produced continuously as a secondary radiation from cosmic-rays interactions in the upper atmosphere of our planet. The characterization of such secondary neutrons is connected with different fields such as environmental radioactivity [1], single event upsets (SEUs) in microelectronics [2], the physics of cosmic-rays and space weather [3].
In this work, the High Efficiency...
Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. One of the best suited methods to measure neutron capture (n,γ) cross sections over the full stellar range of interest is the time-of-flight (TOF) technique.
TOF neutron capture...
The production of neutrons through α-induced reactions play an important role in fields such as nuclear astrophysics, underground laboratories, fission and fusion reactors and non-destructive assays for non-proliferation and spent fuel management applications. However, most of the currently available experimental data was measured decades ago, is incomplete and/or present large discrepancies...
Underground laboratories are key facilities for the study of rare phenomena. The attenuation of cosmic rays and secondary by-products like gamma rays, electrons and muons by several orders of magnitude provide a low background environment that is suitable for experiments dealing with dark matter, neutrinoless double beta decay, measurement of cross sections of astrophysical reactions, etc....
The study of the slow neutron capture process is fundamental for understanding the creation of isotopes heavier than $^{56}$Fe in stars and, by extension, the relative abundances of the different elements.
One of the most prominent methods to constrain the stellar models for the s-process is measuring the neutron capture cross-section (n,$\gamma$) in the neutron energy range of astrophysical...
Neutron emitted from ($\alpha$,n) reactions play an important role in several fields such as nuclear technology, nuclear astrophysics or underground (low background) physics. However, the current knowledge of the neutron yields and neutron energy spectra from ($\alpha$,n) reactions is neither complete nor accurate; which has triggered a renewed interest in studying such reactions. In this...
The WASA-FRS HypHI Experiment focuses on the study of light hypernuclei by means of heavy-ion induced reactions. It is part of the WASA-FRS experimental campaign, and so is the eta-prime experiment [1]. The distinctive combination of the high-resolution spectrometer FRS [2] and the high-acceptance detector system WASA [3] is used. The experiment was successfully conducted at GSI-FAIR in...
Electricity generation from nuclear plants has consistently increased since the establishment of the first facility in 1954. This growth cashort-lived andn be attributed mainly to its significant advantage in reducing greenhouse gas emissions through uranium fission. However, nuclear energy comes with significant drawbacks, notably the production and management of radioactive waste. The...
In this study, the sextic oscillator adapted to the Bohr Hamiltonian was employed to describe even isotopes of platinum (Pt) and osmium (Os) within specific mass number ranges. The primary objective was to investigate the transition of these isotopes from a "γ-unstable" state to a "spherical vibrator" state. The model utilized a potential that was independent of the γ shape variable, allowing...
The shape of nuclei is determined by a fine balance between the stabilizing effect of closed shells and the pairing and quadrupole force that tends to make them deformed. As other well known cases, located in the A = 100 mass region, as Yb, Zr or Nb for example, Sr isotopes [1] are good candidates to study the existence of this nuclear deformation, while Ru and Mo [2] isotopes are interesting...
Radiopharmaceutical therapy (RPT) uses radiolabeled agents affine to biomolecules overexpressed in tumor cell environments. This type of treatment has the potential to improve outcomes for oncologic patients due to its ability to target specifically cancerous cells while sparing healthy cells. In radiopharmaceutical research, it is crucial to determine dosimetry for in vitro experiments, and...
Hadron therapy, whilst precise in treating complex cancer cases, encounters challenges in verifying ion-beam ranges and real-time dose monitoring. Moreover, conventional neutron monitoring measures ambient doses off-field, providing approximations rather than yielding precise point-dose measurements. Compton imaging, integrated with neutron imaging, has the potential to enhance both the...
