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Nuclear Theory·nucl-th

Wednesday·January 31, 2024

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 01

    Properties of chiral nucleon-nucleon interaction at NLO with high cutoffs studied by local projection

    Haoyu Shang🇨🇳 · Rongzhe Hu🇨🇳 · Junchen Pei🇨🇳 · Furong Xu🇨🇳

    The chiral nucleon-nucleon () interaction at high cutoffs has been plagued by the presence of spurious bound states. In this work, the chiral interaction at NLO is studied by the local projection method as the cutoff increases. The evolution of short-range behaviors of pion-exchange interactions and contact interactions is intuitively demonstrated. The -channel potentials toward high cutoffs appear to be erratic at short ranges to compromise with phase shifts, while such erratic behaviors can be avoided in and channels. Furthermore, a chiral interaction at NLO is studied at a cutoff of 700 MeV. The properties of deuteron and triton are testified with this interaction. Such a hard interaction is expected to provide an alternative choice for studies of short-range correlations and high density nuclear matter.

    nucl-thPRC(2024)·1 citation
  2. 02

    Bottomonium suppression in 5.02 and 8.16 TeV p-Pb collisions

    Michael Strickland🇺🇸 · Sabin Thapa🇺🇸 · Ramona Vogt🇺🇸

    We compute the suppression of Upsilon(1S), Upsilon(2S), and Upsilon(3S) states in p-Pb collisions relative to pp collisions, including nuclear parton distribution function (nPDF) effects, coherent energy loss, momentum broadening, and final-state interactions in the quark-gluon plasma. We employ the EPPS21 nPDFs and calculate the uncertainty resulting from variation over the associated error sets. To compute coherent energy loss and momentum broadening, we follow the approach of Arleo, Peigne, and collaborators. The 3+1D viscous hydrodynamical background evolution of the quark-gluon plasma is generated by anisotropic hydrodynamics. The in-medium suppression of bottomonium in the quark-gluon plasma is computed using a next-to-leading-order open quantum system framework formulated within potential nonrelativistic quantum chromodynamics. We find that inclusion of all these effects provides a reasonable description of experimental data from the ALICE, ATLAS, CMS, and LHCb collaborations for the suppression of Upsilon(1S), Upsilon(2S), and Upsilon(3S) as a function of both transverse momentum and rapidity.

    nucl-thhep-phPRD(2024)·11 citations
  3. 03

    Impact of Hot Inner Crust on Compact Stars at Finite Temperature

    Clara Dehman · Mario Centelles · Xavier Viñas

    We conducted a study on the thermal properties of stellar matter with the nuclear energy density functional BCPM. This functional is based on microscopic Brueckner-Hartree-Fock calculations and has demonstrated success in describing cold neutron stars. To enhance its applicability in astrophysics, in this study we extend the BCPM equation of state to finite temperature for -stable neutrino-free matter, taking into consideration the hot inner crust. Such an equation of state holds significant importance for hot compact objects, particularly those resulting from a binary neutron star merger event. Our exploration has shown that with increasing temperature there is a fast decrease of the crust-core transition density, suggesting that for hot stars it is not realistic to assume a fixed value of this density. The microscopic calculations also reveal that the presence of nuclear clusters persists up to MeV, identified as the limiting temperature of the crust. Above this threshold, the manifestation of clusters is not anticipated. Below this temperature, clusters within the inner crust are surrounded by uniform matter with varying densities, allowing for the distinction between the upper and lower transition density branches. Moreover, we computed mass--radius relations of neutron stars, assuming an isothermal profile for -stable neutron star matter at various temperature values. Our findings highlight the significant influence of the hot inner crust on the mass--radius relationship, leading to the formation of larger and more inflated neutron stars. Consequently, under our prescription, the final outcome is a unified equation of state at finite temperature.

    nucl-thastro-ph.HEastro-ph.SRAstron.Astrophys.(2024)·7 citations
  4. 04

    Compton Scattering on 4He with Nuclear One- and Two-Body Densities

    Harald W. Griesshammer (George Washington U.)🇺🇸 · Junjie Liao (George Washington U.)🇺🇸 · Judith A. McGovern (U. of Manchester)🇬🇧 · Andreas Nogga (FZ Jülich)🇩🇪 · Daniel R. Phillips (Ohio U.)🇺🇸

    We present the first \emph{ab initio} calculation of elastic Compton scattering from 4He. It is carried out to [N3LO] in the expansion of EFT. At this order and for this target, the only free parameters are the scalar-isoscalar electric and magnetic dipole polarisabilities of the nucleon. Adopting current values for these yields a parameter-free prediction. This compares favourably with the world data from HIS, Illinois and Lund for photon energies within our theoretical uncertainties of . We predict a cross section up to 7 times that for deuterium. As in 3He, this emphasises and tests the key role of meson-exchange currents between np pairs in Compton scattering on light nuclei. We assess the sensitivity of the cross section and beam asymmetry to the nucleon polarisabilities, providing clear guidance to future experiments seeking to further constrain them. The calculation becomes tractable by use of the Transition Density Method. The one- and two-body densities generated from 5 chiral potentials and the AV18UIX potential are available using the python package provided at \url{https://pypi.org/project/nucdens/}.

    nucl-thnucl-exEPJA(2024)·6 citations
  5. 05

    Nuclear scattering via quantum computing

    Peiyan Wang🇨🇳 · Weijie Du🇺🇸 · Wei Zuo🇨🇳 · James P. Vary🇺🇸

    We propose a hybrid quantum-classical framework to solve the elastic scattering phase shift of two well-bound nuclei in an uncoupled channel. Within this framework, we develop a many-body formalism in which the continuum scattering states of the two colliding nuclei are regulated by a weak external harmonic oscillator potential with varying strength. Based on our formalism, we propose an approach to compute the eigenenergies of the low-lying scattering states of the relative motion of the colliding nuclei as a function of the oscillator strength of the confining potential. Utilizing the modified effective range expansion, we extrapolate the elastic scattering phase shift of the colliding nuclei from these eigenenergies to the limit when the external potential vanishes. In our hybrid approach, we leverage the advantage of quantum computing to solve for these eigenenergies from a set of many-nucleon Hamiltonian eigenvalue problems. These eigenenergies are inputs to classical computers to obtain the phase shift. We demonstrate our framework with two simple problems, where we implement the rodeo algorithm to solve the relevant eigenenergies with the IBM Qiskit quantum simulator. The results of both the spectra and the elastic scattering phase shifts agree well with other theoretical results.

    nucl-thquant-phPRC(2024)·24 citations
  6. 06

    Photon-triggered jets as probes of multi-stage jet modification

    C. Sirimanna🇺🇸 · Y. Tachibana🇯🇵 · A. Angerami · R. Arora · S. A. Bass · S. Cao · Y. Chen · L. Du · R. Ehlers · H. Elfner · W. Fan · R. J. Fries and 41 other authors

    Prompt photons are created in the early stages of heavy ion collisions and traverse the QGP medium without any interaction. Therefore, photon-triggered jets can be used to study the jet quenching in the QGP medium. In this work, photon-triggered jets are studied through different jet and jet substructure observables for different collision systems and energies using the JETSCAPE framework. Since the multistage evolution used in the JETSCAPE framework is adequate to describe a wide range of experimental observables simultaneously using the same parameter tune, we use the same parameters tuned for jet and leading hadron studies. The same isolation criteria used in the experimental analysis are used to identify prompt photons for better comparison. For the first time, high-accuracy JETSCAPE results are compared with multi-energy LHC and RHIC measurements to better understand the deviations observed in prior studies. This study highlights the importance of multistage evolution for the simultaneous description of experimental observables through different collision systems and energies using a single parameter tune.

    nucl-thhep-phEPJ Web Conf.(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE