bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selected lattice QCD results on hadron structure
Authors: Alexandrou Constantia 
Published: September 2023

Abstract
We present recent results on hadron structure using lattice QCD simulations with physical values of the light, strange and charm quark masses. We overview progress on quantities that probe the three-dimensional structure of the nucleon focusing on recent results on Mellin moments and the direct computation of the x-dependence of parton distribution functions employing mainly the quasi-parton distribution approach within the large momentum effective theory.
Ultra-Peripheral Collisions physics with ATLAS
Authors: Malek Fairouz ,   ATLAS Collaboration
Published: September 2023

Abstract
Exclusive production of dilepton pairs, γγ → ℓℓ, ℓ = e, μ, τ, is studied using data from ultraperipheral collisions (UPC) of lead nuclei at

s

N
N

=
5.02

TeV recorded by the ATLAS detector [1] at the LHC. The process of interest proceeds via photon-photon interactions in the strong electromagnetic fields of relativistic lead nuclei. In the case of the dielectron production, within experimental uncertainties the measured integrated cross section is in good agreement with the QED predictions from the Monte Carlo programs STARlight and SuperChic, confirming the broad features of the initial photon fluxes. The differential cross section shows systematic differences from these predictions which are more pronounced at high absolute rapidity, |yee
| and scattering angle, |cosθ*|. In the dimuon production case, the measured cross sections at large absolute rapidity |yμμ
| is found to be about 10-20% larger in data than in the calculations, suggesting the presence of larger fluxes of photons in the initial state. The γγ → ττ process is observed in the UPCs with a significance exceeding 5 standard deviations. This observation can be turned into a constraint on the τ-lepton anomalous magnetic moment. Measurement of light-by-light scattering data are also performed during the LHC Run 2. The diphoton invariant mass distribution is used to set limits on the production of axion-like particles. This result provides the most stringent limits to date on axion-like particle production for masses in the range 6-100 GeV.
Results on light (anti)hypernuclei production with ALICE at the LHC
Authors: Bartsch Esther ,   ALICE collaboration
Published: September 2023

Abstract
The high collision energies reached at the LHC lead to significant production yields of light (anti)hypernuclei in proton–proton (pp), proton–lead (p–Pb) and, in particular, Pb–Pb collisions. The lightest known hypernucleus is the hypertriton, which is a bound state of a proton, a neutron, and a Λ hyperon. It decays weakly with a decay length of a few centimeters. The excellent tracking and particle identification capabilities of the ALICE detector, exploiting the energy loss measurement of the Time Projection Chamber (TPC) and using the Inner Tracking System (ITS) to distinguish between primary and secondary (decay) vertices, allow for the determination of the hypertriton yield across different collision systems, its lifetime, and its binding energy. The latest hypertriton lifetime measurement in Pb–Pb collisions performed in the 2-body decay channel will be presented. This measurement contributes to the solution of the hypertriton lifetime puzzle. In addition, the hypertriton production in different collision systems and at different energies will be compared to model predictions. Due to its low binding energy, and hence to its large size, the hypertriton is the ideal candidate to distinguish between statistical hadronization and coalescence models. With the precision of the presented yield measurements some variants of the aforementioned models can be excluded.
Open-quantum-systems approach to in-medium heavy quarkonium dynamics
Authors: Rothkopf Alexander 
Published: September 2023

Abstract
Heavy quarkonium continues to play a central role in the study of nuclear matter under extremes of temperature and density in relativistic heavy-ion collisions. In this talk I report on recent developments in the theoretical description of quarkonium in-medium dynamics using the open-quantum systems approach. Not only does it provide a clear interpretation of the imaginary part of the complex heavy-quark potential but also reveals that a subtle interplay between screening and wavefunction decoherence is responsible for the melting of heavy quarkonium states.
Jets in e+A SIDIS and Denominator Regularization
Authors: Horowitz W. A. 
Published: September 2023

Abstract
We compute the in-medium jet broadening to leading order in energy in the opacity expansion. At leading order in αs
the elastic energy loss gives a jet broadening that grows with ln E. The next-to-leading order in αs
result is a jet narrowing, due to destructive LPM interference effects, that grows with ln2
E. We find that in the opacity expansion the jet broadening asymptotics are— unlike for the mean energy loss—extremely sensitive to the correct treatment of the finite kinematics of the problem; integrating over all emitted gluon transverse momenta leads to a prediction of jet broadening rather than narrowing. We compare the asymptotics from the opacity expansion to a recent twist-4 derivation and find a qualitative disagreement: the twist-4 derivation predicts a jet broadening rather than a narrowing. Comparison with current jet measurements cannot distinguish between the broadening or narrowing predictions. We comment on the origin of the difference between the opacity expansion and twist-4 results.
We also introduce a novel regularization scheme in quantum field theory, denominator regularization (den reg). Den reg is as simple to apply as the usual dimensional regularization, works simply with a minimal subtraction scheme, and manifestly 1) maintains Lorentz invariance, 2) maintains gauge invariance, 3) maintains supersymmetry, 4) correctly predicts the axial anomaly, and 5) yields Green functions that satisfy the Callan-Symanzik equation. Den reg also naturally enables regularization in asymmetric spacetimes, finite spacetimes, curved spacetimes, and in thermal field theory.
Shell Evolution and Structure of Two-Neutron Halo in Exotic Nuclei
Authors: Suzuki Toshio , Otsuka Takaharu 
Published: September 2023

Abstract
Shell evolution in neutron-rich carbon isotopes is studied with repulsive contributions from three-nucleon forces among valence neutrons. Three-nucleon forces are shown to determine the dripline and improve the energy levels of the isotopes. A three-body model with low-energy neutron-neutron interaction is used to study structure of two-neutron halos of exotic nuclei. Observed halo radii in 22C and 29F are found to be well explained by the three-body model. A possible existence of an excited 2+ state in the halo of 29F and its consequences are discussed. The halo in 17B is found to be d-wave dominant, while the halo in 19B has s-wave component with about 40% probability.
Measurement of the photoabsorption cross section of 24Mg.
Authors: Bekker J A C , Pellegri L , Wiedeking M , Adsley P , Neveling R , Donaldson L M 
Published: September 2023

Abstract
Accurate nuclear data is a key factor in determining the suitability and reliability of many theoretical nuclear models and large-scale calculations. One of the main ingredients of these calculations is how nuclei respond to an electromagnetic field. The excitation of the isovector giant dipole resonance (GDR) is of particular importance in both nuclear structure studies as well as being the main mode of interaction of ultra-high-energy cosmic rays with the extra-galactic medium. This study investigates the photoabsorption cross section in the region of the GDR in 24Mg through the use of proton inelastic scattering and the equivalent virtual photon method. The K600 spectrometer at the iThemba LABS facility was used to obtain high resolution, low background 24Mg(p,p’)24Mg* inelastic scattering data. The virtual photon absorption method is described and the result of applying the method is presented and compared to a previous real photon absorption cross section.
Observation of the shape isomer states in fission fragments from fission of low excited actinides
Authors: Kamanin D V , Pyatkov Yu V , Solodov A N , Strekalovsky A O , Zhuchko V E , Goryainova Z I , Malaza V D , Strekalovsky O V , Kuznetsova E A 
Published: September 2023

Abstract
The results of two methodically different experiments dedicated to the effect of a break-up of fission fragment while it passing through a solid-state foil are discussed. The hypothesis is confirmed that some part of fission fragments which were born in the shape isomer states undergo a break-up due to inelastic scattering in the foil.
β-decay studies across N = 126
Authors: Morales A. I. 
Published: September 2023

Abstract
With the advent of the first Radioactive Ion Beam facilities of new generation, the investigation of the neutron-rich side of the nuclear chart has experienced an impressive progress. However, the discovery and study of new nuclear species in the region around the heaviest known neutron shell closure, N = 126, is still one of the most coveted experimental challenges. At a slower pace, the exploitation of alternative reaction mechanisms and/or advanced instrumentation has opened the possibility to investigate the isomeric and β decay of new, moderately neutron-rich N ∼ 126 nuclei. These are of relevance for the understanding of the nuclear structure below the doubly-magic 208Pb and for their role in the synthesis of the trans-bismuth fissile elements in the r process. In this contribution, a general overview of the β-decay experiments performed at both sides of N = 126 is provided, with a main focus on the experiments carried out at the fragmentation facilities GSI and RIBF.
Lee-Yang-inspired functional including contributions to fourth order in effective field theory
Authors: Bonnard Jérémy 
Published: September 2023

Abstract
In the last years, a new family of energy density functionals directly inspired by effective field theory (EFT) has been developed, among which the ELYO (extended Lee-Yang Orsay) functional. In this paper, a new extension of ELYO that includes the recently calculated fourth-order EFT terms is presented. Compared to the previous version, the description of neutron-drop energies slightly degrades for a harmonic trap ħω = 10 MeV—yet remaining reasonable—, but improves for ħω = 5 MeV. Furthermore, the obtained neutron effective mass agrees significantly better with ab-initio estimates.
Study of the quenching of the GT-decay operator in a microscopic shell-model approach
Authors: Coraggio L , Itaco N , De Gregorio G , Gargano A , Xu F R , Ma Y Z , Cheng Z H , Viviani M 
Published: September 2023

Abstract
The need of a reliable calculation of the nuclear matrix elements for the 0νββ decay has ignited a new interest about the quenching of the axial coupling constant gA
, a procedure introduced to reproduce experimental results connected with GT decays. The goal of this work is to present a preliminary study to tackle this problem within the framework of the realistic shell model.
Development of (p,p′γ) detection capabilities at iThemba LABS through the study of low-lying E1 strength in 58Ni
Authors: Molaeng R E , Donaldson L M , Pellegri L , Usman I T , Bahini A , Brümmer J W , Jivan H , Jones P , Jongile S , Li K C W , Neveling R , Smit F D , Steyn G F 
Published: September 2023

Abstract
This work is a feasibility study designed to test and develop the (p,p′γ) detection capabilities at iThemba LABS when the K600 magnetic spectrometer at 0° is coupled to an array of high purity germanium and cerium-doped lanthanum bromide detectors. This is done through an investigation into the low-lying E1 strength of 58Ni with a proton beam of E
p = 80 MeV. The coincidence matrix of the energies of the excited states and the subsequent γ decays is presented and decays to the first excited state and ground state were identified. The results of this study are compared with previous (α, α′γ) studies.
Investigating the strength of the scissors mode in 151Sm
Authors: Magagula S P E , Malatji K L , Wiedeking M , Pellegri L , Beckmann K S , Bello Garrote F L , Görgen A , Guttormsen M , Hagen T W , Ingeberg V W , Jones P , Kheswa B V , Larsen A C , Midtbø J E , von Neumann-Cosel P , Siem S , Tveten G M , Zeiser F 
Published: September 2023

Abstract
Change in nuclei deformation leads to changes in statistical properties such as the nuclear level density (NLD) and γ-ray strength function (γSF). The NLD and γSF of 151Sm were extracted using the Oslo method. The strength of the scissors resonance (SR) and its centroid energy for 151Sm were found to be 2.13 ± 0.60

μ
N
2

and 2.48 ± 0.25 MeV, respectively. These results were used to place the SR of 151Sm and its magnetic dipole strength B(M1)SR
into the context of previously measured Sm isotopes.
Fission fragment mass distribution of 187Ir
Authors: Dhuri Sangeeta , Mahata K. , Shrivastava A. , Ramachandran K. , Pandit S. K. , Kumar Vineet , Parkar V. V. , Rout P. C. , Kumar A. , Chavan Arati , Kaur Satbir , Santhosh T. 
Published: September 2023

Abstract
The fission fragment mass and total kinetic energy (TKE) distributions were studied for 187Ir populated using 12C + 175Lu reaction at excitation energies 24.8, 23.3, 20.8, and 16.7 MeV above the saddle point. Fission fragments (FF) were detected using position sensitive MWPC’s kept at a folding angle. The mass of the fragment was calculated using Time-of-Flight (TOF) difference method. The multi Gaussian fit to the extracted mass distributions shows the presence of narrower microscopic components corresponding to Z = 38 and 45 in addition to the liquid drop component at lower excitation energies. The GEF model predicts significant asymmetric components at all the measured energies. The TKE distribution investigations suggest the dominance of macroscopic liquid drop components at all energies.
Proton inelastic scattering on 68,70,72Ni
Authors: Galtarossa F , Scomparin L , de Angelis G , Marchi T , Baumann T , Bazin D , Gade A , Gottardo A , John P R , Klintefjord M , Kolos K , Lenzi S M , Mengoni D , Michelagnoli C , Modamio V , Napoli D R , Noji S , Pereira J , Recchia F , Sahin E , Valiente-Dobón J J , Wimmer K , Weisshaar D , Zegers R 
Published: September 2023

Abstract
The proton inelastic scattering on 68,70,72Ni isotopes was measured at the NSCL at MSU, employing the S800 spectrometer coupled to the GRETINA γ-ray array. The aim of the experiment was to determine the degree of collectivity in these neutron-rich Z = 28 isotopes. The use of a hadronic probe allows to complement previous Coulomb excitation measurements of the reduced transition probability B(E2; 0+ → 2+) and deduce the neutron-to-proton transition matrix elements ratio. The high resolution in γ-ray energy achievable with GRETINA gives large control on feeding transitions, thus reducing possible systematics errors in the determination of transition strengths.
Dark Matter with DAMA/LIBRA and its perspectives
Authors: Bernabei R , Belli P , Cappella F , Caracciolo V , Cerulli R , Dai C J , d’Angelo A , Incicchitti A , Leoncini A , Ma X H , Merlo V , Montecchia F , Sheng X D , Ye Z P 
Published: September 2023

Abstract
The existence of Dark Matter particles as a significant portion of the Universe’s total mass is suggested by theoretical reasoning at the galactic and larger scales as well as experimental data. This motivates the DAMA experiment’s efforts to investigate the presence of the Dark Matter particles in the galactic halo by utilizing a model-independent signature with an extremely radio-pure set-up underground. The long-standing, model-independent annual modulation effect at Gran Sasso seen by DAMA with several experimental set-ups is summarized in this paper, along with its perspectives. DAMA/LIBRA-phase2 set-up, ≃ 250 kg highly radio-pure NaI(Tl) further confirms the evidence of a signal that meets all the requirements of the model independent Dark Matter annual modulation signature at high C.L.; the combined exposure of DAMA/NaI and DAMA/LIBRA is 2.86 ton × yr over 22 independent annual cycles. The experiment is currently collecting data in the DAMA/LIBRA–phase2 empowered configuration with an even lower software energy threshold.
Understanding globular cluster abundances through nuclear reactions
Authors: Adsley P , Williams M , Harrouz D S , Carrasco-Rojas D P , de Seréville N , Hammache F , Longland R , Bastin B , Davids B , Faestermann T , Fougères C , Greife U , Hertenberger R , Hutcheon D , La Cognata M , Laird AM , Lamia L , Lennarz A , Meyer A , d’Oliveira Santos F , Palmerini S , Psaltis A , Pizzone R G , Romano S , Ruiz C , Tumino A , Wirth H-F 
Published: September 2023

Abstract
Globular clusters contain multiple stellar populations, with some previous generation of stars polluting the current stars with heavier elements. Understanding the history of globular clusters is helpful in understanding how galaxies merged and evolved and therefore constraining the site or sites of this historic pollution is a priority. The acceptable temperature and density conditions of these polluting sites depend on critical reaction rates. In this paper, three experimental studies helping to constrain astrophysically important reaction rates are briefly discussed.
Symmetry energy in the KIDS framework and extension to quarkionic matter
Authors: Papakonstantinou Panagiota 
Published: September 2023

Abstract
Recent and ongoing laboratory experiments on nuclei and astronomical observations of neutron stars and gravitational waves offer valuable information on the symmetry energy and its dependence on the baryonic density ρ, S(ρ). Analytical models abound for the behavior of S(ρ) in the nucleonic regime. At high densities, however, extrapolations from the nucleonic regime become unreliable and the functional form of S(ρ) should be properly adjusted. Conveniently, the pseudoconformal symmetry emergent in dense, topologically altered nuclear matter suggests a simple expression for the energy per baryon in terms of ρ. Here, I consider a rudimentary interpolation between the Korea-IBS-Daegu-SKKU (KIDS) nucleonic equation of state (EoS) and a pseudo-conformal one at zero temperature. I assume for simplicity that the conformal limit is reached abruptly, but under continuous energy and pressure. Application to neutron stars suggestes that a crossover to quarkionic matter can lead to more compact stars or even heavier stars, depending on the precise form of the nucleonic EoS and on the order of the transition to quarkionic matter. These results are in line with previous studies of hybrid EoSs and represent only a “baby step” to further explorations with hybrid-KIDS EoSs.
Elemental analysis of concrete with fast neutron beams
Authors: Hutton T , Segale N , Mhlongo S , Buffler A 
Published: September 2023

Abstract
Within nuclear installations concrete is widely used for its structural and radiation shielding properties. Developing methods to independently, and non-destructively, verify the composition of such materials in situ is of high priority for the regulation of existing and future nuclear installations. This work reports on the ongoing development of measurement techniques utilising fast neutron beams for the elemental analysis of concrete and its constituents.
Double charge-exchange reactions for the nuclear matrix elements of neutrinoless double beta decay
Authors: Cavallaro M , Agodi C , Auerbach N , Bellone J I , Bijker R , Brischetto G A , Burrello S , Calabrese S , Cappuzzello F , Carbone D , Ciraldo I , Colonna M , De Gregorio G , Delaunay F , Ferreira J L , Fisichella M , Gambacurta D , García-Tecocoatzi H , Gargano A , Lay J A , Lenske H , Linares R , Lubian J , Santopinto E , Sgouros O , Soukeras V , Spatafora A , Torresi D ,   on behalf of the
Published: September 2023

Abstract
Double charge exchange (DCE) reactions induced by heavy ions are crucial tools to access information relevant for neutrinoless double beta decay nuclear matrix elements. In this context the NUMEN project aims to investigate, for each system of interest, the DCE reaction channel together with the whole set of reactions promoted by the same projectile/target interaction in the same experimental conditions and within the same theoretical framework.
Experimental and theoretical multi-channel study of direct nuclear reactions: a tool to provide data driven information on the 76Ge neutrino-less double-beta decay
Authors: Spatafora A , Acosta L , Agodi C , Amador-Valenzuela P , Brischetto G A , Calabrese S , Calvo D , Capirossi V , Chávez-Lomelí E R , Cappuzzello F , Carbone D , Cavallaro M , Ciraldo I , Delaunay F , Djapo H , Eke C , Finocchiaro P , Firat S , Fisichella M , Hacisalihoglu A , Iazzi F , Linares R , Medina N , Moralles M , Oliveira J R B , Pakou A , Pandola L , Petrascu H , Pinna F , Russo G , Sgouros O , da Silveira M A G , Solakci S O , Soukeras V , Souliotis G , Torresi D , Tudisco S , Yildirim A , Zagatto V A B ,   for the
Published: September 2023

Abstract
The study of heavy-ions induced double charge-exchange (HI-DCE) nuclear reactions is a promising way to access data-driven information on neutrino-less double-beta decay nuclear matrix elements. In the following, particular attention is given to the (18O,18Ne) and (20Ne,20O) HI-DCE reactions as tools for β
+
β
+ and β
−
β
− decays, respectively. The experiments are performed in Catania at the Laboratori Nazionali del Sud of the Istituto Nazionale di Fisica Nucleare (INFN-LNS). The MAGNEX magnetic spectrometer is used to momentum analyse the ejectiles of a large network of nuclear reactions. New preliminary experimental data for the 76Se(18O,18F)76As and 76Ge(20Ne,20F)76As single charge exchange (SCE) and for the 76Se(18O,18Ne)76Ge and 76Ge(20Ne,20O)76Se DCE nuclear reactions were also investigated.
Recent results on the new fragment in-flight separator at INFN-LNS
Authors: Martorana NS , Geraci E , Russotto P , Acosta L , Amato A , Calabretta L , Cardella G , Caruso A , Cavallaro S , Cosentino L , Costa M , De Filippo E , De Luca G , Gnoffo B , Guazzoni C , Maiolino C , Pagano EV , Pirrone S , Politi G , Pulvirenti S , Risitano F , Rizzo F , Russo AD , Santonocito D , Trifiró A , Trimarchi M , Tudisco S , Vecchio G 
Published: September 2023

Abstract
A project for an upgrade of the Superconducting Cyclotron is underway at INFN-LNS. One of the goals of this project is the production of RIBs (Radioactive Ion Beams) of high intensity. To reach this purpose, a dedicated facility consisting of a new fragment separator FRAISE (FRAgment In-flight SEparator) is ongoing, exploiting primary beams with a power up to ≈ 2-3 kW. The high intensity achievable with FRAISE requires the use of appropriate diagnostics and tagging systems that can operate also in a strong radioactive environment. In this framework, a R&D program has been started to develop the FRAISE facility as well as the diagnostics and the tagging systems.
Project Meitner. Contributions of the pioneer women of radioactivity
Authors: Morales A. I. , Molina A. , Rubio B. , Aparici A. , Escobar C. , Falcó N. , Ladarescu I. , Mena O. , Molina R. , Moreno-Llácer M. , Muñoz D. , Nácher E. , Orrigo S. E. A. , Palacios J. , Pastor S. , Rodríguez D. , Tain J.L. , Tórtola M. , Villaplana M. 
Published: September 2023

Abstract
Project Meitner is an outreach initiative aiming at raising awareness on the situation of women in Physics. To this purpose, a series of actions have been carried out at the Instituto de Física Corpuscular (IFIC, Spain) with a double purpose: help the pioneer women of radioactivity become known by the broad public, and demystify the current archetypal view of the scientist by presenting the diversity of women who work at our institute. Special attention is paid to stimulate the self-confidence in Physics, Engineering and Computer Science (PECS) subjects to secondary-education female students, as well as to other types of public usually overlooked in outreach activities, such as people with disabilities and elderly people.