Nuclear Theory·nucl-th

Thursday·February 22, 2024

15 papers—8 primary·7 cross-listed

09
Transversity generalized parton distributions in spin-3/2 particles
Dongyan Fu🇨🇳 · Yubing Dong🇨🇳 · S. Kumano🇯🇵
The definitions of the quark and gluon transversity generalized parton distributions (GPDs) in spin-3/2 particles are obtained in the light-cone gauge. It is found that they contain 16 independent components for each parton. Their even or odd property is found in terms of skewness variable, and the odd transversity GPDs vanish in the forward limit. There are 16 amplitudes with helicity flip of quark or gluon. We conclude that all the amplitudes, unpolarized, polarized, and transversity amplitudes, have a common factor $F (ζ)$ carrying all the complex part. Here, the variable $ζ$ is the helicity difference $ζ = (λ^{'} - λ) - (μ^{'} - μ)$ for the amplitude $A_{λ^{'} μ^{'}, λ μ}$ . This kinematical factor is associated with the transfer of the orbital angular momentum in the quark- and gluon-spin-3/2 particle scattering amplitudes. We also derive another main physical quantity, transversity distribution, from the transversity GPDs in the forward limit for the spin-3/2 particles.
↳ hep-phhep-exhep-latnucl-thPRD(2024)·8 citations
10
Renormalization of beta decay at three loops and beyond
Kaushik Borah🇺🇸 · Richard J. Hill🇺🇸 · Ryan Plestid🇺🇸
The anomalous dimension for heavy-heavy-light effective theory operators describing nuclear beta decay is computed through three-loop order in the static limit. The result at order $Z^{2} α^{3}$ corrects a previous result in the literature. An all-orders symmetry is shown to relate the anomalous dimensions at leading and subleading powers of $Z$ at a given order of $α$ . The first unknown coefficient for the anomalous dimension now appears at $O (Z^{2} α^{4})$ .
↳ hep-phnucl-thPRD(2024)·16 citations
11
Giant Dipole Resonance photofission and photoneutron reactions in $^{238}$ U and $^{232}$ Th
D. Filipescu · I. Gheorghe · S. Goriely · A. Tudora · K. Nishio · T. Ohtsuki · H. Wang · G. Fan · K. Stopani · F. Suzaki · K. Hirose · M. Inagaki and 5 other authors
New measurements of photofission and photoneutron reactions on $^{238}$ U and $^{232}$ Th in the Giant Dipole Resonance (GDR) energy region have been performed at the laser Compton-scattering $γ$ -ray source of the NewSUBARU synchrotron radiation facility using a high-and-flat efficiency moderated $^{3}$ He detection array. The neutron-multiplicity sorting of high-multiplicity fission neutron coincidence events has been performed using a dedicated energy dependent, multiple firing statistical treatment. The photoneutron $(γ, in)$ with $i$ ~=~1~--~3 and photofission $(γ, F)$ reactions have been discriminated by considering a Gaussian distribution of prompt-fission-neutron (PFN) multiplicities predicted by the theory of evaporation in sequential neutron emission from excited fission fragments. We report experimental $(γ, n)$ , $(γ, 2 n)$ , $(γ, 3 n)$ and $(γ, F)$ cross sections, average energies of PFNs and of $(γ, in)$ photoneutrons, as well as the mean number of PFNs per fission act and the width of the PFNs multiplicity distribution. Based on these primary experimental results and combined with reasonable assumptions, we extract also the first- and second-chance fission contributions. The new experimental results are compared with statistical-model calculations performed with the EMPIRE-3.2 Malta and TALYS-1.964 codes on the present data and with prompt fission emission calculations obtained with the Los Alamos model in the frame of the most probable fragmentation approach with and without sequential emission.
↳ nucl-exnucl-thPRC(2024)·8 citations
12
Pion-nucleus elastic scatterings incorporating medium effects within the Eikonal-Glauber mode
Hyeon-dong Han🇰🇷 · Parada T. P. Hutauruk🇰🇷 · Seung-il Nam🇰🇷
In this present investigation, we explore the elastic scattering of pions with nuclei ( $π$ - $A$ ), primarily influenced by the $Δ$ (1232) resonance, within the Eikonal-Glauber model. The medium effects are incorporated by considering nuclear-density ( $ρ_{A}$ ) dependent masses of baryons and strong coupling constants. These dependencies are computed and parameterized up to $O (ρ_{A}^{2})$ based on the quark-meson coupling (QMC) model. The Wood-Saxon type density profile is utilized for the bound nucleons within finite nuclei. The element $π^{+}$ - $N$ scattering cross section for the Glauber approach is determined using the conventional effective Lagrangian method. Subsequently, we analyze the total cross sections for elastic scattering with $^{4}$ He and $^{12}$ C targets. Our numerical results demonstrate a favorable agreement with JINR data for the $^{4}$ He target, accurately reproducing the total cross-section. However, when considering the $^{12}$ C target, deviations of approximately $≲ 10%$ . We also consider the multiple-scattering effects inside the nucleus approximately, using the single-channel meson-baryon Bethe-Salpeter equation, resulting in the effective width broadening of the $Δ$ resonance to reproduce the data better.
↳ hep-phnucl-thJ.Korean Phys.Soc.(2024)·1 citation
13
Estimating the dark matter halo velocity and surface temperature of some known pulsars due to dark matter capture
Debashree Sen · Atanu Guha
Considering four known pulsars J1906+0746, J1933-6211, J2043+1711 and the Vela pulsar, we study the scenario of dark matter (DM) capture in neutron stars (NSs). For the purpose we choose four well-known relativistic mean field models to obtain the radius corresponding to the observed mass of these pulsars and consequently the scattering cross-section of DM with the different particles of the $β$ stable NS matter. The estimated DM-electron scattering cross-section in this work is stringent compared to the current direct detection experimental probe. We then compute the lower limit on the halo velocity of DM for the four pulsars from the knowledge of the upper limit on effective temperature of the individual pulsars. We also extend our work to calculate the value of the effective temperature with the different models using the fitted values of the halo velocity of DM of the four pulsars with respect to their distances from the galactic center. Our findings are consistent with the analysis of the observed data.
↳ hep-phastro-ph.HEnucl-th3 citations
14
Reference Energies for Valence Ionizations and Satellite Transitions
Antoine Marie · Pierre-François Loos
Upon ionization of an atom or a molecule, another electron (or more) can be simultaneously excited. These concurrently generated states are called "satellites" (or shake-up transitions) as they appear in ionization spectra as higher-energy peaks with weaker intensity and larger width than the main peaks associated with single-particle ionizations. Satellites, which correspond to electronically excited states of the cationic species, are notoriously challenging to model using conventional single-reference methods due to their high excitation degree compared to the neutral reference state. This work reports 42 satellite transition energies and 58 valence ionization potentials of full configuration interaction (FCI) quality computed in small molecular systems. Following the protocol developed for the quest database [https://doi.org/10.1002/wcms.1517, Véril et al. Wiley Interdiscip. Rev.: Comput. Mol. Sci. 2021, 11, e1517], these reference energies are computed using the configuration interaction using a perturbative selection made iteratively (CIPSI) method. In addition, the accuracy of the well-known coupled-cluster (CC) hierarchy (CC2, CCSD, CC3, CCSDT, CC4, and CCSDTQ) is gauged against these new accurate references. The performances of various approximations based on many-body Green's functions ( $G W$ , GF2, and $T$ -matrix) for ionization potentials are also analyzed. Their limitations in correctly modeling satellite transitions are discussed.
↳ physics.chem-phcond-mat.mtrl-scinucl-thJ.Chem.Theor.Comput.(2024)·13 citations
15
Partial-transpose-guided entanglement classes and minimum noise filtering in many-body Gaussian quantum systems
Boyu Gao🇺🇸 · Natalie Klco🇺🇸
The reduction and distortion of quantum correlations in the presence of classical noise leads to varied levels of inefficiency in the availability of entanglement as a resource for quantum information processing protocols. While generically minimizing required entanglement for mixed quantum states remains challenging, a class of many-body Gaussian quantum states ( $N$ IC) is here identified that exhibits two-mode bipartite entanglement structure, resembling that of pure states, for which the logarithmic negativity entanglement measure remains invariant upon inclusion of the classical correlations and optimal entanglement resources can be clearly quantified. This subclass is found to be embedded within a broader class of many-body Gaussian states ( $N$ -SOL) that retain two-mode entanglement structure for detection processes. These two entanglement classes are relevant in theoretical and experimental applications from the scalar field vacuum to the local axial motional modes of trapped ion chains. Utilizing the subspace that heralds inseparability in response to partial transposition, a minimum noise filtering process is designed to be necessary, sufficient, and computable for determining membership in these classes of entanglement structure. Application of this process to spacelike regions of the free scalar field vacuum is found to improve resource upper bounds, providing new understanding of the entanglement required for the quantum simulation of quantum fields as observed by arrays of local detectors.
↳ quant-phhep-latnucl-thPRA(2024)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE

Transversity generalized parton distributions in spin-3/2 particles

Renormalization of beta decay at three loops and beyond

Giant Dipole Resonance photofission and photoneutron reactions in 238U and 232Th

Pion-nucleus elastic scatterings incorporating medium effects within the Eikonal-Glauber mode

Estimating the dark matter halo velocity and surface temperature of some known pulsars due to dark matter capture

Reference Energies for Valence Ionizations and Satellite Transitions

Partial-transpose-guided entanglement classes and minimum noise filtering in many-body Gaussian quantum systems

Affiliations

Giant Dipole Resonance photofission and photoneutron reactions in $^{238}$ U and $^{232}$ Th