Nuclear Theory·nucl-th

Tuesday·April 6, 2021

16 papers—9 primary·7 cross-listed

01
[Submitted on 2 Apr 2021]
Exploring the structure of $^{29}$ Ne
Manju🇮🇳 · M. Dan🇮🇳 · G. Singh🇪🇸 · Jagjit Singh🇯🇵 · Shubhchintak🇧🇪 · R. Chatterjee🇮🇳
We apply a fully quantum mechanical Coulomb breakup theory under the aegis of post form finite-range distorted wave Born approximation to analyze the elastic Coulomb breakup of $^{29}$ Ne on $^{208}$ Pb at $244$ \,MeV/u. We calculate several reaction observables to quantify its structural parameters. One-neutron removal cross-section is calculated to check the consistency of the ground state configuration of $^{29}$ Ne with the available experimental data. A scrutiny of the parallel momentum distribution of the charged fragment reveals a full width at half maximum of $82$ \,MeV/c, which is in good agreement with the experimental value and indicates a moderate halo for a nearly spherical $^{29}$ Ne in the $^{28}$ Ne $(0^{+}) \otimes 2 p_{3/2} ν$ ground state. The energy-angular distributions and average momentum of the charged fragment point to the absence of post-acceleration effects in the breakup process, a desirable result for the elastic breakup.
Comments:
19 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2104.01200 [pdf]
NPA(2021)·7 citations
02
[Submitted on 4 Apr 2021]
Hybrid stars can be self-bound
Li-Qun Su🇨🇳 · Yan Yan🇨🇳 · Cheng-Ming Li🇨🇳 · Yong-Feng Huang🇨🇳 · Hongshi Zong🇨🇳
Based on the properties of uniform nuclear matter at the nuclear saturation density and basic thermodynamic relations, we first re-study the composition of matter on the surface of normal neutron stars and hybrid stars. It is found that the hybrid stars are composed of uniform hadronic matter on the surface rather than heavy nuclei. Then we use the Walceka model and the self-consistent NJL model to describe the equation of state of low-density hadrons and quark matter at high densities respectively, and the P--interpolation method is employed to connect the equation of state at the extreme densities to study hybrid stars. As a result, we find that the obtained hybrid star mass-radius relation and tidal deformability meet the latest astronomical data. More importantly, we find that the hybrid stars we obtained can be self-bound rather than gravitationally bound, which is completely different from previous related studies.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2104.01519 [pdf]
PRD(2021)·6 citations
03
[Submitted on 4 Apr 2021]
Scaling with deformation in probable $p$ -wave halo $^{34}$ Na
Manju · Jagjit Singh · Shubhchintak · R. Chatterjee
We investigate the electric dipole response of $^{34}$ Na, a probable $p$ -wave one-neutron halo nucleus, lying in the "island of inversion" and having a deformed structure. We use a semi-analytic approach to probe the dipole response and further compare the results obtained from a post form finite-range distorted wave Born approximation theory of Coulomb breakup. The effects of deformation are figured out on the peak positions of the electric dipole strength distribution which further constraint the one-neutron separation energy of the deformed projectile and it leads to a two-dimensional scaling of total $B (E 1)$ strength with parameters: separation energy and deformation.
Comments:
6 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2104.01584 [pdf]
J.Phys.Conf.Ser.(2020)·0 citations
04
[Submitted on 4 Apr 2021]
Equilibrium constants of nuclear reactions in supernova explosions
Jorge A. Muñoz · Marcos A. García · Jorge A. López
We study the change in internal rotational energy in the transformation of protons to neutrons in the \b{eta}-decay reactions that take place in the collapse of the iron core of massive stars that precede type II supernova explosions. We consider an ensemble of electrons, protons, neutrons and neutrinos undergoing \b{eta}-decay reactions, treat the protons and neutrons as triatomic rotors, evaluate the equilibrium constant to obtain the change in rotational energy during the proton-to-neutron transformation. We estimate such change for a variety of conditions, and compare to the energy released in a supernova explosion.
Comments:
9 pages, 1 figure, 1 Table, submitted on Apr. 4, 2021 to the proceedings of the XIII Latin American Symposium of Nuclear Physics and Applications, held in San José, Costa Rica on 1/2020, to be published by the Journal "Ciencia y Tecnología', of the Facultad de Ciencias of the Universidad de Costa Rica
Subjects:
Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
arXiv:
2104.01658 [pdf]
IJMPE(2022)·0 citations
05
[Submitted on 4 Apr 2021]
Neutrino energy reconstruction from semi-inclusive samples
R. González-Jiménez🇪🇸 · M. B. Barbaro🇮🇹 · J. A. Caballero🇪🇸 · T. W. Donnelly🇺🇸 · N. Jachowicz🇧🇪 · G. D. Megias🇪🇸 · K. Niewczas🇧🇪 · A. Nikolakopoulos🇧🇪 · J. W. Van Orden🇺🇸 · J. M. Udías🇪🇸
We study neutrino-nucleus charged-current reactions on finite nuclei for the situation in which an outgoing muon and a proton are detected in coincidence, i.e., we focus on semi-inclusive cross sections. We limit our attention to one-body current interactions (quasielastic scattering) and assess the impact of different nuclear effects in the determination of the neutrino energy. We identify the regions in phase space where the neutrino energy can be reconstructed relatively well, and study whether the cross section in those regions is significant. Our results indicate that it is possible to filter more than 50% of all events according to the muon and proton kinematics, so that for the DUNE and T2K fluxes the neutrino energy can be determined with an uncertainty of less than 1% and 3%, respectively. Furthermore, we find that the reconstructed neutrino energy does not depend strongly on how one treats the final-state interactions and is not much affected by the description of the initial state. On the other hand, the estimations of the uncertainty on the neutrino energy show important sensitivity to the modeling of the initial state.
Comments:
19 pages, 15 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2104.01701 [pdf]
PRC(2022)·35 citations
06
[Submitted on 5 Apr 2021]
Effective field theory for shallow P-wave states
E. Epelbaum🇩🇪 · J. Gegelia🇩🇪 · H.P. Huesmann🇩🇪 · U.-G. Meißner🇩🇪 · X.-L. Ren🇩🇪
We discuss the formulation of a non-relativistic effective field theory for two-body P-wave scattering in the presence of shallow states and critically address various approaches to renormalization proposed in the literature. It is demonstrated that the consistent renormalization involving only a finite number of parameters in the well-established formalism with auxiliary dimer fields corresponds to the inclusion of an infinite number of counterterms in the formulation with contact interactions only. We also discuss the implications from the Wilsonian renormalization group analysis of P-wave scattering.
Comments:
23 pages, 5 figures. Contribution to Special Issue of Few-Body Systems: Celebrating 30 years of Steven Weinberg's papers on Nuclear Forces from Chiral Lagrangians
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2104.01823 [pdf]
Few Body Syst.(2021)·15 citations
07
[Submitted on 5 Apr 2021]
Manipulating strong electromagnetic fields with the average transverse momentum of relativistic nuclear collisions
Giuliano Giacalone🇩🇪 · Chun Shen🇺🇸
We show that an event-shape engineering based on the mean transverse momentum of charged hadrons, $[p_{t}]$ , provides an optimal handle on the strength of the magnetic field created in central heavy-ion collisions at high energy. This is established through quantitative evaluations of the correlation existing between the event-by-event magnetic field produced by the spectator protons in 5.02 TeV Pb+Pb collisions and the event-by-event $[p_{t}]$ at a given collision centrality. We argue that the event selection based on $[p_{t}]$ provides a better handle on the magnetic field than the more traditional selection based on the event ellipticities. Advantages brought by this new method for the experimental search of the chiral magnetic effect are discussed.
Comments:
11 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2104.01890 [pdf]
EPJA(2021)·4 citations
08
[Submitted on 5 Apr 2021]
The "Folk Theorem" on Effective Field Theory: A Case for Nuclear Physics
Mannque Rho🇫🇷
Although largely unrecognized, Gerry Brown had played a seminal and prescient role for the development of the currently heralded "first-principles approach" to nuclear dynamics known as "nuclear effective field theory" ( $n$ EFT for short). I give a brief account in what way he entered -- together with his Korean colleagues -- at the earliest stage of its development and what he left behind for the future in paving the road to go {\it way beyond} the standard $n$ EFT. I do this in the context of Gerry's original conceptual ideas conceived after the "dilepton fiasco" that indicate a surprising new role of hidden local and scale symmetries in nuclear physics.
Comments:
8 pages, no figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2104.01899 [pdf]
1 citation
09
[Submitted on 5 Apr 2021]
Two-body wave functions and compositeness from scattering amplitudes: II. Application to the physical $N^{*}$ and $Δ^{*}$ resonances
Takayasu Sekihara🇯🇵
The meson-baryon molecular components for the $N^{*}$ and $Δ^{*}$ resonances are investigated in terms of the compositeness, which is defined as the norm of the two-body wave function from the meson-baryon scattering amplitudes. The scattering amplitudes are constructed in a $π N$ - $η N$ - $σ N$ - $ρN$ - $π Δ$ coupled-channels problem in a meson exchange model together with several bare $N^{*}$ and $Δ^{*}$ states, and parameters are fitted so as to reproduce the on-shell $π N$ partial wave amplitudes up to the center-of-mass energy 1.9 GeV with the orbital angular momentum $L \leq 2$ . As a result, the Roper resonance $N (1440)$ is found to be dominated by the $π N$ and $σ N$ molecular components while the bare-state contribution is small. The squared wave functions in coordinate space imply that both in the $π N$ and $σ N$ channels the separation between the meson and baryon is about more than 1 fm for the $N (1440)$ resonance. On the other hand, dominant meson-baryon molecular components are not observed in any other $N^{*}$ and $Δ^{*}$ resonances in the present model, although they have some fractions of the meson-baryon clouds.
Comments:
20 pages, 5 figures, version accepted for publication in PRC, parameters are updated, description of the discussion part is improved
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2104.01962 [pdf]
PRC(2021)·10 citations
10
[Submitted on 3 Apr 2021] (cross-list from hep-ph)
Possible Assignment of Excited Light $^{3} S_{1}$ Vector Mesons
Jie-Cheng Feng🇨🇳 · Xian-Wei Kang🇨🇳 · Qi-Fang Lü🇨🇳 · Feng-Shou Zhang🇨🇳
We reanalyze the problems in the assignment of 3 $^{3} S_{1}$ and 4 $^{3} S_{1}$ light mesons, which have not yet been well established with the $q q ˉ$ quark model. Regge trajectories and the $^{3} P_{0}$ decay model are used respectively to study the mass and width of the observed states and predict the missing ones. By comparing our calculations with the latest experiments, we suggest that the inconsistent data of $ρ (2150)$ may include two similar structures $ρ (4^{3} S_{1})$ and $ω (4^{3} S_{1})$ . In addition, the problem of the $K^{*} (2^{3} S_{1})$ assignment, with two observed states $K^{*} (1410)$ and $K^{*} (1680)$ , is investigated, with several possible explanations.
Comments:
10 pages, 9 tables, 6 figures, accepted for publication in PRD
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2104.01339 [pdf]
PRD(2021)·24 citations
11
[Submitted on 5 Apr 2021] (cross-list from hep-ph)
Coherent neutrino scattering and the Migdal effect on the quenching factor
Jiajun Liao🇨🇳 · Hongkai Liu🇺🇸 · Danny Marfatia🇺🇸
Recent measurements of the germanium quenching factor deviate significantly from the predictions of the standard Lindhard model for nuclear recoil energies below a keV. This departure may be explained by the Migdal effect in neutron scattering on germanium. We show that the Migdal effect on the quenching factor can mimic the signal of a light Z' or light scalar mediator in coherent elastic neutrino nucleus scattering experiments with reactor antineutrinos. It is imperative that the quenching factor of nuclei with low recoil energy thresholds be precisely measured close to threshold to avoid such confusion. This will also help in experimental searches of light dark matter.
Comments:
5 pages, 4 figures, 1 table. Version to appear in PRD
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2104.01811 [pdf]
PRD(2021)·25 citations
12
[Submitted on 5 Apr 2021] (cross-list from astro-ph.HE)
Effects of dark matter on the in-spiral properties of the binary neutron stars
H. C. Das🇮🇳 · Ankit Kumar🇮🇳 · S. K. Patra🇮🇳
Using the relativistic mean-field model, we calculate the properties of binary neutron star (BNS) in the in-spiral phase. Assuming the dark matter (DM) particles are accreted inside the neutron star (NS) due to its enormous gravitational field, the mass $M$ , radius $R$ , tidal deformability $λ$ and dimensionless tidal deformability $Λ$ are calculated at different DM fractions. The value of $M$ , $R$ , $λ$ and $Λ$ decreases with the increase of DM percentage inside the NS. The in-spiral phase properties of the BNS are explored within the post-Newtonian (PN) formalism, as it is suitable up to the last orbits in the in-spiral phase. We calculate the strain amplitude of the polarization waveform $h_{+}$ and $h_{\times}$ , (2,2) mode waveform $h_{22}$ , orbital phase $Φ$ , frequency of the gravitational wave $f$ and PN parameter $x$ with DM as an extra candidate inside the NS. The magnitude of $f$ , $Φ$ and $x$ are almost the same for all assumed forces; however, the in-spiral time duration in the last orbit is different. We find that the BNS with soft equation of state and a high fraction of DM sustains more time in their in-spiral phase. We suggest that one should take DM inside the NS when they modelling the in-spiral waveforms for the BNS systems.
Comments:
9 pages, 7 figures, 2 tables, accepted for publication in MNRAS
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2104.01815 [pdf]
MNRAS(2021)·57 citations
13
[Submitted on 5 Apr 2021] (cross-list from hep-ph)
First Saturation Correction in High Energy Proton-Nucleus Collisions: II. Single Inclusive Semi-Hard Gluon Production
Ming Li🇺🇸 · Vladimir V. Skokov🇺🇸
Exploiting recently obtained analytic solutions of classical Yang-Mills equations for higher order perturbations in the field of the dilute object (proton), we derive the complete first saturation correction to the single inclusive semi-hard gluon production in high energy proton-nucleus collisions by applying the Lehmann-Symanzik-Zimmermann reduction formula. We thus finalize the program started by Balitsky (see Ref.~\cite{Balitsky:2004rr}) and independently by Chirilli, Kovchegov and Wertepny (see Ref.~\cite{Chirilli:2015tea}) albeit using a very different approach to carry out our calculations. We extracted the functional dependence of gluon spectrum on the color charge densities of the colliding objects; thus our results can be used to evaluate complete first saturation correction to the double/multiple inclusive gluon productions.
Comments:
60 pages and 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2104.01879 [pdf]
JHEP(2021)·14 citations
14
[Submitted on 5 Apr 2021] (cross-list from cond-mat.quant-gas)
Low-momentum interactions for ultracold Fermi gases
M. Urban🇫🇷 · S. Ramanan🇮🇳
We consider a two-component Fermi gas with a contact interaction from the BCS regime to the unitary limit. Starting from the idea that many-body effects should not depend on short-distance or high-momentum physics which is encoded in the s-wave scattering length, but only on momentum scales of the order of the Fermi momentum, we build effective low-momentum interactions that reproduce the scattering phase shifts of the contact interaction below some momentum cutoff. Inspired from recent successes of this method in nuclear structure theory, we use these interactions to describe the equation of state of the Fermi gas in the framework of Hartree-Fock-Bogliubov theory with perturbative corrections. In the BCS regime, there is a range of cutoffs where we obtain fully converged results. Near unitarity, convergence is not yet reached, but we obtain promising results for the ground-state energies close to the experimental ones. Limitations and possible extensions of the approach are discussed.
Comments:
11 pages, 4 figures; v2: minor changes
Subjects:
Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
arXiv:
2104.01901 [pdf]
PRA(2021)·9 citations
15
[Submitted on 5 Apr 2021] (cross-list from hep-lat)
Quantum algorithms for transport coefficients in gauge theories
Thomas D. Cohen🇺🇸 · Henry Lamm🇺🇸 · Scott Lawrence🇺🇸 · Yukari Yamauchi🇺🇸
In the future, ab initio quantum simulations of heavy ion collisions may become possible with large-scale fault-tolerant quantum computers. We propose a quantum algorithm for studying these collisions by looking at a class of observables requiring dramatically smaller volumes: transport coefficients. These form nonperturbative inputs into theoretical models of heavy ions; thus, their calculation reduces theoretical uncertainties without the need for a full-scale simulation of the collision. We derive the necessary lattice operators in the Hamiltonian formulation and describe how to obtain them on quantum computers. Additionally, we discuss ways to efficiently prepare the relevant thermal state of a gauge theory.
Comments:
15 pages, 4 figures
Subjects:
High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2104.02024 [pdf]
PRD(2021)·83 citations
16
[Submitted on 5 Apr 2021] (cross-list from nucl-ex)
Determination of shear forces inside the proton
V. D. Burkert🇺🇸 · L. Elouadrhiri🇺🇸 · F.X. Girod🇺🇸
We report on the first determination of the shear forces quarks inside the proton from experimental data on deeply virtual Compton scattering. The maximum shear force of approximately 40 MeV/fm occurs near 0.6 fm from the proton center, indicating where confinement forces may be strongest. On the macroscopic scale of the earth surface, this force corresponds to the weight of a mass of about 650 kg. The shear forces in the proton reverse direction at r = 0.45 fm from the center.
Comments:
4 pages, 4 figures
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2104.02031 [pdf]
64 citations

Affiliations

first authorsco-authorsvia INSPIRE