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Nuclear Theory·nucl-th

Tuesday·June 11, 2024

16 papers—10 primary·6 cross-listed

All16Primary10Cross-lists6
  1. 11

    Neutron-star seismology with realistic, finite-temperature nuclear matter

    Fabian Gittins🇬🇧 · Nils Andersson🇬🇧

    The oscillation spectrum of a neutron star is notably rich and intrinsically dependent on the equation of state of nuclear matter. With recent advancements in gravitational-wave and electromagnetic astronomy, we are nearing the capability to perform neutron-star asteroseismology and probe the complex physics of neutron stars. With this in mind, we explore the implementation of three-parameter finite-temperature matter models in the computation of neutron-star oscillations. We consider in detail the thermodynamics of nuclear matter and show how this information enters the problem. Our realistic treatment takes into account entropy and composition gradients that exist in the nuclear matter, giving rise to buoyant g-mode oscillations. To illustrate the implementation, we determine the oscillation spectrum of a low-temperature neutron star. In addition to the expected compositional and thermal g-modes, we find perturbations sourced by phase transitions in the equation of state. We also examine two thermal models, comparing the results for constant redshifted temperature with those for uniform entropy per baryon.

    ↳ gr-qcastro-ph.HEnucl-thPRD(2025)·14 citations
  2. 12

    High-precision measurements of the atomic mass and electron-capture decay value of Tc

    Zhuang Ge🇫🇮 · Tommi Eronen🇫🇮 · Vasile Alin Sevestrean🇷🇴 · Ovidiu Niţescu🇷🇴 · Sabin Stoica🇷🇴 · Marlom Ramalho🇫🇮 · Jouni Suhonen🇫🇮 · Antoine de Roubin🇧🇪 · Dmitrii Nesterenko🇫🇮 · Anu Kankainen🇫🇮 · Pauline Ascher🇫🇷 · Samuel Ayet San Andres🇪🇸 and 16 other authors

    A direct measurement of the ground-state-to-ground-state electron-capture decay value of Tc has been performed utilizing the double Penning trap mass spectrometer JYFLTRAP. The value was determined to be 1695.92(13) keV by taking advantage of the high resolving power of the phase-imaging ion-cyclotron-resonance technique to resolve the low-lying isomeric state of Tc (excitation energy of 38.910(40) keV) from the ground state. The mass excess of Tc was measured to be 86015.95(18) keV/c, exhibiting a precision of about 28 times higher and in agreement with the value from the newest Atomic Mass Evaluation (AME2020). Combined with the nuclear energy-level data for the decay-daughter Mo, two potential ultra-low -value transitions are identified for future long-term neutrino-mass determination experiments. The atomic self-consistent many-electron Dirac--Hartree--Fock--Slater method and the nuclear shell model have been used to predict the partial half-lives and energy-release distributions for the two transitions. The dominant correction terms related to those processes are considered, including the exchange and overlap corrections, and the shake-up and shake-off effects. The normalized distribution of the released energy in the electron-capture decay of Tc to excited states of Mo is compared to that of Ho currently being used for electron-neutrino-mass determination.

    ↳ nucl-exnucl-thPLB(2024)·7 citations
  3. 13

    Photon induced proton and anti-proton pair production with ultraperipheral heavy ion collisions at RHIC

    Cheng Zhang🇨🇳 · Li-Mao Zhang🇨🇳 · Ding Yu Shao🇨🇳

    We investigate proton-antiproton () pair production via photon-photon fusion in the ultra-peripheral collisions at RHIC, employing a joint impact parameter and transverse momentum dependent formalism. We consider proton exchange, -channel resonance and hand-bag mechanisms, predicting differential distributions of production. Our theoretical predictions can be tested against future measurements at RHIC, to enhance our understanding of photon-photon interactions in strong electromagnetic fields.

    ↳ hep-phhep-exnucl-exnucl-thSCPMA(2025)·9 citations
  4. 14

    Simulating Parton Fragmentation on Quantum Computers

    Tianyin Li🇨🇳 · Hongxi Xing🇨🇳 · Dan-Bo Zhang🇨🇳

    Parton fragmentation functions (FFs) are indispensable for understanding processes of hadron production ubiquitously existing in high-energy collisions, but their first principle determination has never been realized due to the insurmountable difficulties in encoding their operator definition using traditional lattice methodology. We propose a framework that makes a first step for evaluating FFs utilizing quantum computing methodology. The key element is to construct a semi-inclusive hadron operator for filtering out hadrons of desired types in a collection of particles encoded in the quantum state. We illustrate the framework by elaborating on the Nambu-Jona-Lasinio model with numeral simulations. Remarkably, We show that the semi-inclusive hadron operator can be constructed efficiently with a variational quantum algorithm. Moreover, we develop error mitigation techniques tailed for accurately calculating the FFs in the presence of quantum noises. Our work opens a new avenue for investigating QCD hadronization on near-term quantum computers.

    ↳ hep-phnucl-thquant-ph21 citations
  5. 15

    Long Range Azimuthal Correlation, Entanglement and Bell Inequality Violation by Spinning Gluons at the LHC

    Yuxun Guo🇺🇸 · Xiaohui Liu🇨🇳 · Feng Yuan🇺🇸 · Hua Xing Zhu🇨🇳

    We apply the recently developed concept of the nucleon energy-energy correlator (NEEC) for the gluon sector to investigate the long-range azimuthal angular correlations in proton-proton collisions at the LHC. The spinning gluon in these collisions will introduce a significant nonzero asymmetries in both Higgs Boson and top quark pair productions. The genesis of the correlation lies in the intricate quantum entanglement. Owing to the substantial effect, the NEEC observable in Higgs Boson and production emerges as a pivotal avenue for delving into quantum entanglement and scrutinizing the Bell inequality at high-energy colliders.

    ↳ hep-phhep-exhep-thnucl-ex+1Research(2025)·26 citations
  6. 16

    Unraveling alignment pattern in high-energy particles via transverse momentum disbalance analysis

    I.P. Lokhtin🇷🇺 · A.V. Nikolskii🇷🇺 · A.M. Snigirev🇷🇺

    The hypothesis of the relation between strong azimuthal correlations, known as alignment, in families of hadrons and photons observed in cosmic ray experiments and the selection procedure of the highest-energy particles together with the transverse momentum conservation are tested in the framework of the HYDJET++ model. The results show that the high degree of alignment can appear in nucleus-nucleus interactions at reasonable values of the transverse momentum disbalance of most energetic detected particles.

    ↳ hep-phastro-ph.HEhep-exnucl-thEPJA(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE