The vibration and rotation modes shed light on collective properties of nuclei. The rotational level patterns in $^{220}$Rn and $^{226}$Ra nuclei have been obtain in a collective quadrupole+octupole approach with microscopic mass tensor and moments of inertia dependent on deformation and pairing degrees of freedom. However, the main objective is to quantitatively confirm the known experimental...
An experimental search for a bound dineutron has been ongoing for decades, presenting the experiments for light and heavier nuclei masses as target nuclei. Our approach to indirectly observe a bound dineutron is based on the theoretical prediction by Migdal [1] and considers not light, but heavier nuclei in nuclear reactions, near which a bound dineutron can be formed in the outgoing channels...
The spectroscopic quadrupole moment ($Q$) is a fundamental property that provides information about nuclear deformation. However, its precise extraction for the transition elements remains challenging due to their complex atomic structures. Meanwhile, muonic atoms offer a simpler hydrogen-like structure with amplified hyperfine interaction effects. Recent efforts have revived this technique,...
This research is the field-theoretical description of the deuteron breakup by fast electrons, being a prolongation of the studies carried out [1] at the Kharkiv Institute of Physics & Technology. As in our recent works [2,3], key features of the approach proposed embody gauge-independent calculations of the reaction amplitudes, as well as, a fresh look at the construction of the one-nucleon...
There are two common approaches for calculating cross-sections for weak probes: one involves using square-integrable basis functions [1-5], while the other relies on response functions (dynamical polarizabilities) [6]. For multi-open-channel problems, all methods struggle to some extent. Considering these issues, we develop a powerful novel alternative which takes advantage of the randomness...
A neutron capture by a nucleus results in a compound nucleus that quickly desexcites while emitting ฮณ-rays if its excitation energy is less than a few MeV. This process, known as a radiative capture, occurs in many stellar nucleosynthesis. The reaction cross sections can be measured precisely for stable nuclei or nuclei close to the valley of stability but this becomes challenging for more...
Ensembles of He and H isotopes can be studied with unique completeness and resolution in nuclear emulsion layers longitudinally exposed to relativistic nuclei [1,2]. Determination of the invariant mass of their pairs or triplets by emission angles in the velocity conservation approximation is sufficient to identify a number of unstable states โ $^8$Be(0$^+$), $^8$Be(2$^+$), $^9$B,...
Precision measurements in beta decay play an essential role in the search for new physics beyond the standard model (SM) by probing โexoticโ phenomena such as scalar and tensor interactions. The presence of these interactions would lead to deviations in specific observables from their SM predictions. The study of the full beta energy spectrum offers a sensitive mean to probe these exotic...
The Standard Model (SM) of electroweak interactions has been remarkably successful in describing fundamental particle interactions. However, compelling observational and theoretical indications suggest that it is an incomplete framework, necessitating an extended theoretical formulation. Searches for New Physics (NP) beyond the SM are actively pursued along three primary frontiers: the...
Nuclear beta decay and electron capture allow us to probe the Standard Model (SM) and search for new physics in competitive and complementary ways to the LHC. In particular, beta decay can be extremely sensitive to exotic scalar and tensor currents at the TeV scale through precision measurements. This sensitivity shows up most clearly in the Fierz interference term, b_F, which is linearly...
The study of nuclear reactions involving light nuclei at low incident energies is essential for the development and corroboration of different theories and models applied to astrophysical environments [1,2]. The experimental Basic Nuclear Physics (FNB) line, installed at the 3 MV tandem accelerator of the National Accelerators Center (CNA), is being adapted and prepared to study these kinds of...
One of goals of hypernuclear physics is to obtain information on baryon-baryon interaction in a unified way. Especially, it becomes an important issue to obtain information on hyperon(Y)-nucleon(N) interaction. For this purpose, hyperon-nucleon scattering experiments are planned at JLab and J-PARC facilities [1].
The physics of strangeness $S=-1$ hypernuclei bears a fundamental difference...
V. Marchand$^{1}$, W. Dong$^{1}$, S. Franchoo$^{1}$, T. Hourat$^{1}$, David Lunney$^{1}$, V. Manea$^{1}$, E. Minaya Ramirez$^{1}$, E. Morin$^{1}$, S. Roset$^{1}$.
$^{1}$Universitรฉ Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
The GANIL accelerator complex in Caen, France recently commissioned a new superconducting linear accelerator as part of the SPIRAL2 facility. This...
The investigation of nuclei near the proton shell closure at (Z = 82) remains a vibrant field of research, as these nuclei exhibit a rich interplay of shapes driven by shape coexistence, and proton-neutron interactions. In the (A $\sim$ 190) mass region, odd-odd thallium (Tl) isotopes serve as an exemplary testing ground where both symmetric oblate and triaxial configurations have been...
The Standard Model (SM) of electroweak interactions relies on key assumptions, such as the vector and axial-vector nature of the weak force, parity violation, and the masslessness of neutrinos, which were initially inferred from neutron beta decay. Nowadays, precision experiments with slow neutrons are involved in searches of physics beyond SM (BSM). The BRAND experiment is one of them. It...
We report on the pre-neutron mass yields of actinides near $^{232}$Th measured in inverse kinematics at the VAMOS++ spectrometer and its newly developed second arm. The experiment used a $^{232}$Th beam accelerated for the first time at GANIL, impinging on a carbon target (100 $\mu g\cdot cm^{-2}$) inducing fission of a few actinides from multi-nucleon transfer. The VAMOS++ spectrometer allows...
Brunilde Gnoffo a,b, Sara Pirroneb , Giuseppe Politi a,b, Enrico De Filippob , Giuseppe Cardellab , Elena Geraci a,b, Concettina Maiolinoc , Nunzia Simona Martoranab , Emanuele Vincenzo Paganoc , Massimo Papab, Fabio Risitano d,b, Francesca Rizzoa,c,e, Paolo Russottoc , Marina Trimarchid,b, Cristina Zagamia,c,e
A Dipartimento di Fisica e Astronomia โEttore Majoranaโ, Universita...
In the last decade, the ab-initio self-consistent Gorkov Greenโs function (SCGGF) [1,2] approach has marked a step forward in the knowledge of bulk nuclear properties of even-even open-shell nuclei, such as the ones lying along the Ar-Cr isotopic chains [3,4]. The access to the one-particle propagator has allowed the study of ground and excited states of neighbouring odd-A isotopes...
Recent Monte Carlo Shell Model (MCSM) calculations made by T. Togashi et. al. [Phys. Rev. Lett. 121, 062501 (2018)] attempt to account for discrepancies observed between measurements and previous theoretical calculations of the reduced transition probability B(E2;$2^{+}_{1} \rightarrow 0^{+}_{1}$โ) in the neutron deficient Sn isotopes. One of the predictions of the MCSM calculation is that a...
The idea of the capability of nuclei to emit two alpha particles simultaneously dates back to the late 1970s, inspired by the concept of two-proton radioactivity. Subsequently, observation of the exotic decay was considered unfeasible due to the extremely low branching ratio, which was calculated to be on the order of $10^{-20}$ or less. Recent theoretical work by Mercier et al. (PRL...
The synthesis of superheavy nuclei (SHN) with heavy ion collisions is modelled as a three staged model: capture, formation and survival, where this presentation explores the first two stages. Starting from the model in [1], the memoryless Brownian random walk was replaced by a Markov chain approach yielding significantly faster calculations which was then used to determine the cross...
Proton-induced fission of $^{232}$Th and $^{238}$U at tens-of-MeV energies has been studied. This type of reactions is commonly used in the isotope separation on-line (ISOL) technique, which provides high-quality and intense rare isotope (RI) beams. This work aims to estimate RI beam yields for application at RAON, Korea's heavy-ion accelerator. A stochastic model based on the Langevin...
The region surrounding the doubly magic nucleus $^{100}$Sn, particularly on the proton-rich side beyond the (N=50) shell closure, provides a crucial test ground for modern nuclear structure models. It offers access to fundamental phenomena such as isospin symmetry breaking, nucleon pairing, shell evolution, and the influence of the tensor force and Wigner energy [1]. Despite its importance,...
Motivated by the doubly magic nature of the system $^{16}$O + $^{48}$Ca, we have measured [1] its fusion excitation function from above to far below the barrier at the Laboratori Nationali di Legnaro of INFN. We have used the $^{16}$O beams from the XTU Tandem accelerator. The fusion cross sections were measured down to a few ฮผb by identifying the evaporation residues in a detector telescope,...
The observation of double-beta decays and double-electron captures have become an important tool in the search for physics beyond the Standard Model (SM). These decays have been proposed to decay by emitting either two neutrinos or no neutrinos. While the two neutrino mode has been observed [1], the proposed neutrinoless decay mode requires the neutrino to be its own antiparticle (a Majorana...
The multi-configurational dynamical symmetry (MUSY) serves as a unifying framework that links the fundamental structure models of atomic nuclei: the shell, collective, and cluster models [1, 2]. It constitutes a composite symmetry where each configuration possesses a usual [U(3)] dynamical symmetry and an additional symmetry that connects these configurations among themselves. As a consequence...
The high momentum transfer encountered in heavy ion Double Charge Exchange (DCE) reactions provides an ideal environment for studying correlation phenomena beyond mean-field in Nuclear Matrix Elements (NMEs). This investigation is of paramount interest for probing the nuclear counterpart of the elusive neutrinoless double beta (0ฮฝฮฒฮฒ) decay. Currently, the NMEs for such a decay are embedded in...
Over the last five years, generative machine learning has proven to be incredibly powerful in various domains: communications, image processing, graph analysisโฆ The question now is: how can it help improve the microscopic description of complex physical phenomena, such as nuclear fission? In fact, there is currently no theoretical model capable of predicting fission half-lives, yields and...
Pablo Gonzรกlez 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...
In the neutron-proton interacting boson model (IBM-2) [1], the SU*(3) limit appears, which has a triaxial nature. It was first clarified by A.E.L. Dieperink and R. Bijker [2] with group theory and with coherent state analysis. This triaxiality has been also suggested from the correspondence between shape variables ($\beta, \gamma$) and SU(3) irrep label ($\lambda, \mu$) by Ref. [3]. Moreover,...
Laser spectroscopy for studying the ground and isomeric state properties of exotic nuclei has established itself as a versatile and powerful tool, with the capabilities of providing access to nuclear model-independent data about charge radii, electromagnetic moments and spins [1]. Part of this achievement is owed to the possibility of having narrow-bandwidth (60 MHz), high power and tunable...
The nuclear level density (NLD) represents the number of accessible energy states in a nucleus at a given excitation energy and is vital for modeling nuclear reactions and decay processes. At lower excitation energies, NLD is significantly enhanced by collective effects, rotational and vibrational motions, which are prominent in deformed nuclei. This phenomenon, referred to as collective...
The neutron dripline in oxygen isotopes presents a clear challenge and unique opportunity for studies of shell evolution and nuclear structure. The heaviest observed bound isotope of fluorine ($Z=9$) has 22 neutrons, whereas oxygen -- with only one fewer proton, $Z=8$ -- can only bind 16 neutrons. This striking anomaly is a result of an increase in the spacing between the ฮฝ($d_{3/2}$) orbital...
The isotope $^{229}$Th is of particular interest due to its exceptionally low-energy isomeric state ($\sim$ 8.2 eV), which can be studied via vacuum ultraviolet (VUV) spectroscopy, and holds great potential for the development of a nuclear clock [1,2].
Understanding this isomerโs properties, including its excitation and decay modes, is hereby essential and involves investigating the nuclear...
Fission is one of the most complex reactions. The mass asymmetry of the fission fragments depends on the shell structure of the fissioning nucleus. It is generally believed that mass-asymmetric fission disappeared due to the annihilation of the shell structure in high excitation energy. Recently, however, fissioning over a wide range of excitation energies has been experimentally observed by...
In our previous studies, possible and statistically significant observations of a bound dineutron in nucler reactions with fast neutrons on 159Tb [1] and 197Au [2] nuclei was investigated, that coincides with the Migdalโs and Dyugaevโs [3, 4] predictions about bound dineutron existence. To directly observe the decay of bound dineutrons, the estimation of half-life and the end-point energy for...
SEASON (Spectroscopy of Electron and Alpha in Silicon bOx couNter) is a decay station developed at CEA-IRFU and currently being commissioned. SEASON is designed to meet the constraints of a high energy-resolution decay station and an efficient counter for laser spectroscopy for the study of heavy and superheavy nuclei. The detection system is made of 7 DSSD (Double-sided Silicon Stripped...
Halo nuclei are exotic nuclear structures found far from stability near the dripline. Unlike stable nuclei, halo nuclei exhibit a large matter radius. This peculiar feature is the result of their strongly clusterised structure. They can be seen as a compact core to which one or two valence neutrons are loosely bound. Due to the quantum tunnel effect, they exhibit a high presence probability at...
The future Electron Ion Collider (EIC) will offer a unique opportunity to explore the parton distributions
inside nucleons and nuclei thanks to an unprecedented luminosity, a wide range of energies, a large choice of nuclei
and polarization of both beams.
The electron Proton-Ion Collider collaboration (ePIC) detector will be capable of precise determination
of the position of primary...
A few years ago, our group has developed anew method for measuring doses in ultra high dose rate charged particle beams, based on multivolume ion chambers - the QUADDRO detector. The measurement, however, did not account for the energy of the particles in the beam and such a measurement was done using radiocheromic films pklaced axially in the beam.
While performimg energy measurements in 10...
The study of delayed emissions in proton-rich nuclei provides valuable new insights into nuclear structure and enables the investigation of open quantum systems. We present a comprehensive analysis of the resonant Gamow states of 20Na, populated via the ฮฒโบ decay of 20Mg, with particular focus on the decay widths associated with the proton emission process. Moreover, by employing several...
The Tile Calorimeter (TileCal) is a central hadronic calorimeter of the ATLAS experiment at the LHC. The TileCal plays an important role in the reconstruction of jets, hadronically decaying tau leptons, missing transverse energy, in the muon identification and provides information to the dedicated calorimeter trigger. This sampling calorimeter is composed by the plastic scintillating tiles and...
This study introduces an innovative method for characterizing the nuclear equation of state (EOS) through the analysis of central heavy-ion collisions within the Fermi energy range. We examine experimental data from Nickel-Nickel and Xenon-Tin collisions at energies of 32โ100 MeV/nucleon, collected using the INDRA 4ฯ array at GANIL. By leveraging Artificial Intelligence (AI) and Machine...
Scandium (Sc) and Terbium (Tb) have gained significant interest in nuclear medicine due to their radioactive isotopes being suitable for cancer diagnostics and therapy, offering a promising avenue for theranostics. However, challenges persist in achieving high molar activity and radiochemical purity for medical applications. The physical isotope mass separation technique presents an interest...
Plasma-assisted CO$_2$ dissociation has been widely studied for in-situ resource utilization (ISRU) on Mars, where it is used to generate oxygen and fuel from the Martian CO$_2$-rich atmosphere. On Earth, the process has been explored for carbon capture and utilization, where CO$_2$ is utilized to produce valuable fuels and chemicals. Its application to space propulsion, however, is nearly...
Collisions of heavy-ions at relativistic energies provide an essential tool to study the behavior of strongly interacting matter at elevated temperature and density.
In the regime of few GeV per nucleon, quark deconfinement does not occur, but a non-trivial dynamics of the system is driven by moderate temperatures (few tens MeV) and baryon densities (2-3 nuclear saturation density), which...
This application serves as an audit tool for sensitive sites using nuclear or radioactive materials. It evaluates their physical protection systems through expert-formulated questionnaires tailored for each organizational category. It provides privileges to users as administrators (experts) or standard users (site managers) and facilitates information exchange between them. The application...
The MORA project [1] aims to measure the D correlation in nuclear beta decay with high precision to look for CP violation, using a transparent Paul trap and laser orientation techniques. It is currently located at JYFL (Finland), using a 23Mg beam provided by the IGISOL facility. MORA will next be moved to the DESIR experimental hall (GANIL, France) to perform decay measurements using both...
