Moderadores
Red FNUC (Red Temática de Física Nuclear)
- Cesar Domingo-Pardo (IFIC (CSIC-University of Valencia))
- Tomás Raúl Rodríguez Frutos (Universidad Complutense de Madrid)
Red FNUC (Red Temática de Física Nuclear)
- Tomás Raúl Rodríguez Frutos (Universidad Complutense de Madrid)
- Cesar Domingo-Pardo (IFIC (CSIC-University of Valencia))
Red FNUC (Red Temática de Física Nuclear)
- Cesar Domingo-Pardo (IFIC (CSIC-University of Valencia))
- Tomás Raúl Rodríguez Frutos (Universidad Complutense de Madrid)
Improving the accuracy of the neutron capture and fission cross sections of $^{239}$Pu is listed as a High Priority Request by the Nuclear Energy Agency (NEA/OECD), due to their central importance for nuclear applications and reactor technology. To address this, a dedicated experimental campaign was carried out at n_TOF, the CERN time-of-flight facility, where $^{239}$Pu was measured for the...
Carbon isotopes provide a rich testing ground for the evolution of shell structure and halo phenomena in light neutron-rich nuclei. In particular, $^{15}\mathrm{C}$ [1] is a well-known one-neutron halo candidate, with the valence neutron weakly bound ($S_n \approx 1.2$ MeV) in a $2s_{1/2}$ orbital.
Its first excited state at 0.74 MeV has a dominant single-particle configuration with a...
Wide multigap glass RPCs deployed in the miniTRASGO muon monitor, developed at LIP [1] provide a field reference for readout optimization. Continuous operation has been used to validate mechanics and HV distribution, grounding and shielding, environmental corrections, and a lightweight trajectory reconstruction chain. These lessons inform a timing-oriented architecture in which a single thin,...
Los núcleos ligeros cercanos a la línea de goteo neutrónica presentan propiedades exóticas, como el \textit{clustering} y la formación de halo. Determinar su estructura ha representado un desafío importante durante las últimas décadas.
El núcleo $11Li$ posee un halo de dos neutrones, y aunque su estado fundamental está consolidado como una combinación de ondas $s \ (35 (4)\%)$, $p \ (59...
The total neutron yield and neutron spectra from (α,xn) reactions are relevant for basic nuclear physics, nuclear technology, and applications$^1$. These fields rely on accurate experimental data of the nuclear reactions involved. Yet most of the available data were measured decades ago, are incomplete, or have large uncertainties. Updating these libraries for (α,xn) requires, among others,...
Pablo González Rusell for the R^{3}B collaboration
The atomic nuclear structure is still one of the most complex problems in modern physics. This is due to the fact that many-body correlations beyond the symmetries of the nucleon-nucleon potential leads to the existence of a large number of nuclear systems whose properties differ significantly from what can be expected based on the simple...
Accurate neutron-capture cross sections are essential for modelling the slow neutron capture process, which governs the synthesis of roughly half of the elements heavier than 56Fe and determines their isotopic ratios. In particular, the case of 146Nd is of astrophysical interest due to the lack of capture data in the resolved resonance region below 5 keV (RRR) [1], the persistent disagreement...
(On behalf of S505-DESPEC experiment collaboration)
Our understanding of the production of the heavy elements in the Universe is still incomplete. In particular the contribution of the rapid neutron capture (r-) process to the observed stellar abundances around mass number A~195 (the 3rd r-process peak), which is linked to the effect of N=126 shell closure in the production path. Given the...
Nicolás Sánchez Vázquez for the n_{TOF} collaboration.
Nuclear fission is a complex process characterized by the splitting of a nucleus into two fragments of comparable mass. The mass and charge distributions of the resulting fission fragments are governed by the interplay between macroscopic nuclear properties and microscopic shell effects under extreme deformation. This competition...
The exploration of physics beyond the Standard Model in nuclear physics is closely tied to investigating rare electroweak transitions. The most promising process is neutrinoless double-beta decay ($0\nu\beta\beta$), a nuclear transition where two neutrons simultaneously convert into two protons with the emission of only two electrons. If observed, this second-order decay would prove that...
The study of reactions involving weakly bound exotic nuclei is an active field due to advances in radioactive beam facilities. Many of these nuclei can be approximately described by a model consisting of an inert core and one or more valence nucleons. However, to properly describe some of these nuclei within few-body models, additional effects must be considered, such as deformations and...
In this talk, I will be covering one of the newest methods for nuclear structure calculations, Neural Quantum States (NQS). While it is not specific to nuclear physics [1,2], since its first application for computing the deuteron bound state [3], its application to nuclear ground states has been consistently gaining momentum [4,5]. The claim of NQS is that, by introducing a highly-expressive...
The unique structure of the halo nucleus $^{11}$Be continues to challenge the traditional understanding of nuclear stability and weak interaction dynamics. In this nuclei, the characteristics of a weakly-bound single-particle orbital wave function, defined by its closeness to the confinement threshold, are central to many nuclear phenomena. The weak binding of the halo neutron...
Regions near closed shells in areas of the nuclear chart far from stability are very interesting from the point of view of nuclear structure, since a shell model description based on single-particle states can be challenged by collective effects. One of the most interesting regions is the one around the doubly-magic $^{78}$Ni nucleus, with $Z=28$ and $N=50$ [1],
The systematics of...
Abstract
The region near ${^{78}\mathrm{Ni}}$ is crucial for nuclear structure studies, as it lies around a doubly-magic shell closure ($Z = 28$, $N = 50$), making it an ideal testing ground for shell evolution and the interplay between single-particle and collective effects. Currently, many experimental and theoretical efforts are dedicated to investigating this region of the nuclear...
Neutrino oscillation experiments have revealed that neutrinos have mass, providing the first clear evidence of physics beyond the Standard Model. These experiments are essential to achieve key goals in neutrino physics, such as measuring the CP-violating phase, determining neutrino mixing angles and mass ordering, and probing possible new physics. Future facilities such as DUNE and...
Abstract
This study investigates the coexistence of regular and intruder configurations in odd gold isotopes, the latter being proposed as a one-particle–one-hole excitation above the Z=82 energy gap [1].
Experimental data on the systematic of the energy spectra are analysed for the A=179–195 Au chain. The work employs the Interacting Boson–Fermion Model (IBFM) [2] to describe this...
Neutrons from ($\alpha$,n) reactions are essential for astrophysics, dark matter experiments, and nuclear material interrogation, yet available cross-section and yield data are limited and often uncertain [1]. To improve this situation, the Spanish nuclear physics community has established the MANY Collaboration (Measurement of Alpha Neutron Yields).
At CNA [2], the 3 MV tandem accelerator...
Neutrons produced in α-induced reactions play important roles in fields such as nuclear astrophysics, neutron background in underground laboratories, fission and fusion reactors and non-destructive assays for non-proliferation and spent fuel management applications. However, most of the available data on (α,n) reactions was measured decades ago, is incomplete and/or present large discrepancies...
AGATA (Advanced GAmma Tracking Array) is an European collaboration devoted to developing a next-generation γ-ray spectrometer for nuclear structure research at facilities employing both radioactive and stable ion beams. Once completed, AGATA will consist of 180 high-purity germanium (HPGe) detectors, arranged in triple cluster structures (ATCs), providing an overall solid-angle coverage of...
The complex nature of the nucleon-nucleon interaction allows for spherical, oblate and prolate deformations to appear at similar energies within the same nucleus. This phenomenon, known as shape coexistence, is widespread across the nuclear chart and it provides a crucial role in understanding nuclear structure [1].
In our study we complement shell-model calculations [2] with...
The WASA-FRS HypHI Experiment focuses on the study of light hypernuclei by means of heavy-ion induced
reactions in 6Li collisions with 12C at 1.96GeV/u. 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 FRagment
Separator (FRS) [2] and the high-acceptance detector system WASA [3] is used....
The High Efficiency Neutron Spectrometry Array (HENSA) project focuses on the development and scientific application of high-efficiency neutron spectrometers [1], with uses in underground laboratories, rare-events experiments, cosmic-ray neutron studies, space weather research, and environmental dosimetry. The detection principle of HENSA is based on the Bonner Spheres System (BSS) [2], but...
The ISOLDE Superconducting Recoil Separator (ISRS) [1-2] represents a major step forward in extending the experimental capabilities of HIE-ISOLDE for precision studies of exotic nuclei. Designed as a next-generation, high-resolution recoil separator, the ISRS will enable a broad physics program with unprecedented resolving power. In parallel with its technical development, the ISRS physics...
The ISOLDE Superconducting Recoil Separator (ISRS)[1] is an ambitious R&D initiative at CERN aiming to realize an advanced, high-resolution recoil spectrometer based on superconducting Canted Cosine Theta (CCT) magnet technology. Achieving the required field homogeneity, stability, and harmonic control in these magnets is essential to guarantee precise mass separation and time-of-flight...
El programa experimental del CIEMAT en n_TOF, con ya casi 25 años de recorrido, se ha centrado principalmente, aunque no únicamente, en la medida de datos nucleares relevantes para la tecnología nuclear de fisión. Y dentro de este campo, mayoritariamente en medidas de secciones eficaces de captura neutrónica.
Estas nuevas medidas siguen siendo necesarias para mejorar la modelización por...
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 [1]. 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. However, TOF neutron...
The sTED detector is the reference scintillator system at the EAR2 n_TOF facility at CERN, playing a central role in high-precision neutron time-of-flight measurements. It has been used to measure numerous isotopes, including$^{79}$Se, $^{94}$Nb, $^{160}$Gd, $^{94,95,96}$Mo, $^{209}$Bi, $^{146}$Nd, and $^{28,29}$Si. To further enhance its performance, additional modules have been added with...
El Centro Nacional de Aceleradores (CNA) es una Instalación Científico Técnica Singular (ICTS) y por tanto está abierta a usuario externos. En este contexto, la instalación de neutrones HiSPANoS ha visto incrementada de manera notable la actividad de usuarios externos, incluyendo tanto grupos de investigación nacionales y extranjeros, como de la industria. En el caso de los usuarios...
