Article
Astronomy & Astrophysics
D. Nguyen, C. Neuburger, R. Cruz-Torres, A. Schmidt, D. W. Higinbotham, J. Kahlbow, P. Monaghan, E. Piasetzky, O. Hen
Summary: This article reports on a study that searches for bound di-neutrons by comparing electron-induced proton-knockout measurements from Helium-3 and Tritium. The results show that the two-body breakup cross section on Tritium is only 0.9% of that on Helium-3 under the measured kinematics. This provides the possibility for further studies on di-neutrons with smaller binding energies.
Article
Optics
Denise J. M. Ahmed-Braun, Paul S. Julienne, Servaas J. J. M. F. Kokkelmans
Summary: This study demonstrates that the physical mechanism behind the observed phenomenon can be explained by the presence of a closed-channel shape resonance, emphasizing the need for a three-channel approach. The introduced model, called resonance-facilitated, mediates all couplings through the Feshbach state, without direct coupling between the additional channel and the open channel. This greatly simplifies the complexity of the original three-channel model.
Article
Astronomy & Astrophysics
Clelia Altomonte, Alan J. Barr
Summary: This paper analyzes the mathematical details of applying quantum information theory to scattering amplitudes associated with Standard Model processes, focusing on the theoretical principle of the Choi-Jamiolkowski isomorphism or state-channel duality.
Article
Physics, Nuclear
A. Mercenne, N. Michel, J. P. Linares Fernandez, M. Ploszajczak
Summary: Transfer reactions are important for determining spectroscopic factors and astrophysical reaction rates. However, their theoretical evaluation is typically limited by the absence of structure degrees of freedom in standard reaction theory. The recently developed coupled-channel Gamow shell model (GSM-CC) is proposed as a method to include internucleon correlations in transfer cross sections for medium nuclei. The 40Ca(d, p) transfer reaction is studied as an example using the GSM-CC, successfully reproducing experimental data with a phenomenological Hamiltonian.
Article
Physics, Multidisciplinary
Aurora Tumino, Giuseppe G. Rapisarda, Marco La Cognata, Alessandro Oliva, Alejandro Kievsky, Carlos A. Bertulani, Giuseppe D'Agata, Mario Gattobigio, Giovanni L. Guardo, Livio Lamia, Dario Lattuada, Rosario G. Pizzone, Stefano Romano, Maria L. Sergi, Roberta Sparta, Michele Viviani
Summary: The Coulomb-free S-1(0) proton-proton (p-p) scattering length is determined using the quasi-free p + d -> p + p + n reaction. The resulting p-p scattering length is -18.17 (+0.52)(-0.58)vertical bar(stat) +/- 0.01(syst) fm and the effective range is 2.80 +/- 0.05(stat) +/- 0.001(syst) fm. A model based on universality concepts is developed to interpret this result and suggests assessing the charge symmetry breaking of the short-range interaction.
COMMUNICATIONS PHYSICS
(2023)
Article
Engineering, Multidisciplinary
Junpu Li, Lan Zhang
Summary: This study applies the latest research results based on the semi-analytical boundary collocation method to calculate computational electromagnetics, addressing common mechanical bottlenecks encountered in simulating electromagnetic scattering and introducing new methods to improve computational efficiency and accuracy.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Physics, Nuclear
K. J. Cook, A. Chevis, T. K. Eriksen, E. C. Simpson, T. Kibedi, L. T. Bezzina, A. C. Berriman, J. Buete, I. P. Carter, M. Dasgupta, D. J. Hinde, D. Y. Jeung, P. McGlynn, S. Parker-Steele, B. M. A. Swinton-Bland, T. Tanaka, W. Wojtaczka
Summary: The purpose of the study is to reduce uncertainties in the carbon production rate in the universe by measuring a set of proton angular distributions for the population of the Hoyle state and 2(1)(+) state in C-12(p, p') reactions. Using a silicon detector array, the researchers measured high-precision C-12(p, p') cross sections for the ground, first 2+, and Hoyle states in C-12.
Article
Physics, Nuclear
M. Catacora-Rios, A. E. Lovell, F. M. Nunes
Summary: In this study, the researchers used Bayesian Monte Carlo simulations to analyze the uncertainty of (d,p) reactions at different energies. By using the asymptotic normalization coefficient as a constraint, they were able to greatly reduce the uncertainty.
Article
Mathematics, Applied
Timothy Candy, Sebastian Herr, Kenji Nakanishi
Summary: The sharp range of Sobolev spaces is determined for the well-posedness of the Cauchy problem in the classical Zakharov system, including existence of solutions, uniqueness, persistence of initial regularity, and real-analytic dependence on the initial data. Additionally, global well-posedness and scattering are proved under a condition on the data for the Schrodinger equation at the lowest admissible regularity. The results apply to dimensions d > 4, both energy-critical and energy-supercritical.
JOURNAL OF THE EUROPEAN MATHEMATICAL SOCIETY
(2023)
Article
Chemistry, Physical
Sylwia Zimosz, Dawid Zych, Grazyna Szafraniec-Gorol, Sonia Kotowicz, Katarzyna Malarz, Robert Musiol, Aneta Slodek
Summary: This study successfully designed and synthesized imidazole-based phenothiazine derivatives 3a-3e with different alkyl chain lengths, and systematically investigated their photophysical properties. The results showed that the alkyl chain length affected the absorption and fluorescence spectra of the compounds, and the compounds exhibited good solvatochromism. Moreover, the compounds 3a-3e showed potential applications as molecular fluorescent dyes in biological studies.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Physics, Multidisciplinary
Awad A. Ibraheem, M. Aygun, N. A. M. Alsaif, A. Alghamdi, Sh Hamada
Summary: The elastic scattering differential cross-sections of d + Li-6, Li-7, Li-9, Li-11 systems were reanalyzed using different calculation methods and density distributions. Theoretical results showed good agreement with experimental data, highlighting the weak binding nature of the Li-11 isotope.
Article
Physics, Nuclear
L. Girlanda, E. Filandri, A. Kievsky, L. E. Marcucci, M. Viviani
Summary: A unitary transformation is used to eliminate redundant terms in the 2N contact interaction at N3LO in Chiral Effective Field Theory. This results in a 3N interaction, with its short-range component expressed in terms of five combinations of low-energy constants (LECs) that parameterize the N3LO 2N contact Lagrangian. By considering this interaction in conjunction with the AV18 2N potential, accurate fitting of low-energy p-d scattering polarization observables, particularly the A_y asymmetry, is achieved using the involved LECs. The resulting interaction is of the correct magnitude for an N3LO contribution.
Article
Acoustics
Miad Al Mursaline, Timothy K. Stanton, Andone C. Lavery, Erin M. Fischell
Summary: A theoretical model is proposed to predict the scattered acoustic field of an elastic cylinder that is partially insonified by a directional transceiver. The model takes into account the spherical spreading and directivity of the incident waves and extends the formulation used in a previous article to include effects of oblique insonification and axial propagating guided wave resonances. The model is compared with numerical simulations and laboratory data, demonstrating the realistic effects associated with scattering from elastic cylinders insonified by a directional transceiver.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Astronomy & Astrophysics
Hee-Jin Kim, Samson Clymton, Hyun-Chul Kim
Summary: This article investigates the transverse single-spin asymmetries of the very ffiffiforward neutral pion in polarized p + p collisions. It reveals the presence of large asymmetries at low transverse momentum and provides a successful explanation with baryonic triple Regge exchanges.
Article
Physics, Nuclear
P. Descouvemont
Summary: The Li-11(p,t)Li-9 two-neutron transfer reaction was investigated at the laboratory energy of 33 MeV using the distorted wave Born approximation (DWBA) and the continuum discretized coupled channel (CDCC) method. The complex three-body structure of Li-11 made the calculation of cross section more complicated, but the model was able to reproduce experimental data reasonably well without adjustable parameters. The study showed that the cross section is highly sensitive to the long-range part and halo structure of the Li-11 wave function.
Article
Astronomy & Astrophysics
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G Meissner
Summary: We predict the differential cross sections for e(-)p and e(+)p elastic scattering in the PRad-II energy region. The sensitivity of the cross sections to two-photon exchange effects is investigated, and it is found that the differences between model calculations and phenomenological extractions of two-photon corrections cannot be resolved if the uncertainty in the form factors is taken into account.
Article
Physics, Multidisciplinary
Fabian Brauneis, Timothy G. Backert, Simeon Mistakidis, Mikhail Lemeshko, Hans-Werner Hammer, Artem G. Volosniev
Summary: In this study, we investigate the ground-state properties of weakly repulsive one-dimensional bosons in the presence of an attractive zero-range impurity potential. We find that there are two cases: all bosons are bound to the impurity or all bosons are in a scattering state, and we derive the critical line that separates these cases in the parameter space. The critical line determines the maximum number of bosons that can be bound by the impurity potential in the thermodynamic limit, forming an artificial atom.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Particles & Fields
Jin-Yi Pang, Martin Ebert, Hans-Werner Hammer, Fabian Mueller, Akaki Rusetsky, Jia-Jun Wu
Summary: The use of effective-range expansion may lead to the generation of spurious sub-threshold poles outside of the convergence range, resulting in inconsistencies in three-body equations. The impact of these spurious poles on the three-body quantization condition in a finite volume is investigated and it is shown that they lead to a peculiar dependence of energy levels on box size. Furthermore, a method for removing these poles, proposed in a recent reference, is demonstrated to be applicable in finite-volume calculations, reproducing the exact structure of energy levels with improved accuracy order by order in the EFT expansion.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Wael Elkamhawy, Hans-Werner Hammer
Summary: We use Halo effective field theory (Halo EFT) to calculate the electromagnetic properties of the deformed one-neutron halo candidate Ne-31. In this framework, Ne-31 is bound by a resonant P-wave interaction between the Ne-30 core and the valence neutron. We adopt a spherical formalism to compute the electromagnetic form factors and the E1-breakup strength distribution of Ne-31 at leading order in Halo EFT, with the associated uncertainties estimated according to our power counting.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Physics, Nuclear
Wael Elkamhawy, Hans-Werner Hammer, Lucas Platter
Summary: We investigate the weak decay of one-neutron halo nuclei into the proton-core continuum using a cluster effective field theory. We calculate both the direct decay into the continuum and the resonant final state interactions between the proton and the core. We discuss in detail the decay of 11Be and compare our results to experimental data. As another example, we predict the branching ratio for β-delayed proton emission in the case of 19C.
Article
Physics, Multidisciplinary
Lukas Rammelmueller, David Huber, Matija Cufar, Joachim Brand, Hans-Werner Hammer, Artem G. Volosniev
Summary: We present a numerical analysis of spin-2 fermions in a one-dimensional harmonic potential in the presence of a magnetic point-like impurity. Ground-state level crossing between sectors with different fermion parities is observed already for a few particles, which indicates a few-body precursor of a quantum phase transition. This picture is further supported by analyzing density-density correlations in momentum space. Finally, we discuss the experimental realization of this system in existing cold-atoms platforms.
Proceedings Paper
Physics, Nuclear
S. Konig
Summary: Simulating quantum systems in a finite volume is an important theoretical tool for extracting information about them. The discrete energy levels of the system changing with the size of the volume encode its real-world properties. This article presents recent progress in finite-volume simulations of fewbody systems, discussing efficient numerical implementation of separable interactions and the use of eigenvector continuation for robust and efficient volume extrapolations.
13TH INTERNATIONAL SPRING SEMINAR ON NUCLEAR PHYSICS PERSPECTIVES AND CHALLENGES IN NUCLEAR STRUCTURE AFTER 70 YEARS OF SHELL MODEL, ISS 2022
(2023)
Article
Astronomy & Astrophysics
Eric Braaten, Hans-Werner Hammer
Summary: A nonrelativistic unparticle is an excitation created by an operator with a definite scaling dimension in a nonrelativistic field theory with approximate conformal symmetry. The rate of point production for an unparticle depends on its total energy with a power-law exponent determined by its scaling dimension. Using the exact result for the 3-point function of primary operators in a nonrelativistic conformal field theory, we derive the contribution to the point production rate of an unparticle from its decay into another unparticle recoiling against a particle. In the case of a broken conformal symmetry by a large positive scattering length, the exponent of the energy in the point production rate is deduced for the loosely bound two-particle state recoiling against a particle with large relative momentum.
Article
Physics, Nuclear
Simone Velardita, Hector Alvarez-Pol, Thomas Aumann, Yassid Ayyad, Meytal Duer, Hans-Werner Hammer, Liancheng Ji, Alexandre Obertelli, Yelei Sun
Summary: We propose a two-target measurement method to determine the interaction cross section of hypernuclei with a target nucleus. The method allows us to extract the production cross section of a given hypernucleus and its interaction cross section on a specific target from two independent measurements. The matter radius of the hypernucleus can be deduced from the analysis of the interaction cross section.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: Using dispersion theory, the Sigma-to-Lambda transition form factors in electromagnetic interactions are calculated considering the pion electromagnetic form factor, SU(3) chiral perturbation theory, the baryon decuplet, and the pi pi- K coupled-channel effect. The electric form factor is significantly affected by the inclusion of the K channel, while the magnetic form factor is minimally affected. The uncertainties in the three-flavor chiral perturbation theory are estimated using a bootstrap sampling method.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Matthias Gobel, Bijaya Acharya, Hans-Werner Hammer, Daniel R. Phillips
Summary: In this study, we calculate the E1 breakup of the 2n halo nucleus 11Li using halo effective field theory (Halo EFT) and observe a good agreement with experiment. The neutron-neutron (nn) final-state interactions (FSIs) are found to be the most important contribution to the E1 distribution, while the neutron-core (nc) FSIs slightly shift the peak position to lower energies. Additionally, we investigate the sensitivity of the E1 response to the spin structure of the neutron-9Li interaction.
Article
Physics, Particles & Fields
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: The electromagnetic form factors of the Lambda hyperon in the time-like region are precisely determined through a dispersion-theoretical analysis of world data. Different scenarios are tested and a good description of the data is obtained in the time-like region. The uncertainties in the form factors are estimated and the magnetic radius is predicted when the electric Lambda radius is taken as a constraint. Various vector meson to baryon coupling constants are also extracted.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
Nuwan Yapa, Sebastian Konig
Summary: This article presents an extension of eigenvector continuation (EC), called finite-volume eigenvector continuation (FVEC), which allows for extrapolation of quantum system simulations in finite periodic boxes across large ranges of box sizes. The formal justification for FVEC is provided by matching periodic functions at different box sizes. A concrete implementation of FVEC using a discrete variable representation based on plane-wave states is introduced, and several applications calculated within this framework are presented.
Article
Physics, Nuclear
S. Dietz, H-W Hammer, S. Konig, A. Schwenk
Summary: Resonances in three-body systems are investigated using pionless effective field theory at leading order. Two complementary methods are employed, including analytically continuing the Faddeev equation to the unphysical sheet and exploring the level structure of three-body states in a finite volume approach. The study focuses on both the three-boson system and the three-neutron system, finding trajectory of Borromean three-body Efimov states turning into resonances for the former and no sign of three-body resonances or virtual states at leading order for the latter.
