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Nuclear Theory·nucl-th

Thursday·February 20, 2020

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    First Excited 2+ Energy State Estimations of Even-even Nuclei by Using Artificial Neural Networks

    S. Akkoyun · H. Kaya · Y.Torun

    The first excited 2+ energy states of nuclei give many substantial information related to the nuclear structure. Including these levels, all excited states of nuclei are shown regularities in spin, parity and energy. In the even-even nuclei, the first excited state is generally 2+ and the energy values of them increase as the closed shells are approached. The excited levels in nuclei can be investigated by using theoretical nuclear models such nuclear shell model. In the present study for the first time, we have used artificial neural networks for the determination of the energies of first 2+ states in the even-even nuclei in nuclidic chart as a function of Z, N and A numbers. We have used adopted literature values for the estimations. According to the results, the method is convenient for this goal and one can confidently use the method for the determination of first 2+ state energy values whose experimental values do not exist in the literature.

    nucl-thIndian J.Phys.(2022)·13 citations
  2. 02

    Exclusive final state hadron observables from neutrino-nucleus multi-nucleon knockout

    J. E. Sobczyk🇪🇸 · J. Nieves🇪🇸 · F. Sánchez🇨🇭

    We present results of an updated calculation of the 2p2h (two particle two hole) contribution to the neutrino-induced charge-current cross section. We provide also some exclusive observables, interesting from the point of view of experimental studies, e.g. distributions of momenta of the outgoing nucleons and of available energy, which we compare with the results obtained within the NEUT generator. We also compute, and separate from the total, the contributions of 3p3h mechanisms. Finally, we discuss the differences between the present results and previous implementations of the model in MC event-generators, done at the level of inclusive cross sections, which might significantly influence the experimental analyses, particularly in the cases where the hadronic observables are considered.

    nucl-thhep-phPRC(2020)·41 citations
  3. 03

    A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation

    Niseem Magdy (1) · Mao-Wu Nie (2,3) · Guo-Liang Ma (3,4) · Roy A. Lacey (5) · ((1) Department of Physics, University of Illinois at Chicago, Chicago Illinois, USA, (2) Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong, China (3) Key Laboratory of Particle Physics and Particle Irradiation, Ministry of Education, Shandong University, Qingdao, Shandong, China, (4) Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China, (5) Depts. of Chemistry and Physics, Stony Brook University, Stony Brook, New York, USA)

    A Multi-Phase Transport (AMPT) model is used to study the detection sensitivity of two of the primary correlators -- and -- employed to characterize charge separation induced by the Chiral Magnetic Effect (CME). The study, performed relative to several event planes for different input "CME signals", indicates a detection threshold for the fraction , which renders the -correlator insensitive to values of the Fourier dipole coefficient , that is larger than the purported signal(signal difference) for ion-ion(isobaric) collisions. By contrast, the correlator indicates concave-shaped distributions with inverse widths () that are linearly proportional to , and independent of the character of the event plane used for their extraction. The sensitivity of the correlator to minimal CME-driven charge separation in the presence of realistic backgrounds, could aid better characterization of the CME in heavy-ion collisions.

    ↳ nucl-exnucl-thPLB(2020)·9 citations
  4. 04

    Photon Self-energy in Magnetized Chiral Plasma from Kinetic Theory

    Han Gao🇨🇳 · Zonglin Mo🇨🇳 · Shu Lin🇨🇳

    We study the photon self-energy in magnetized chiral plasma by solving the response of electromagnetic field perturbations in chiral kinetic theory with Landau level states. With lowest Landau level approximation and in collisionless limit, we find solutions for three particular perturbations: parallel electric field, static perpendicular electric and magnetic field, corresponding to chiral magnetic wave, drift state and tilted state, from which we extract components of photon self-energy in different kinematics. We show no solution is possible for more general field perturbations. We argue this is an artifact of the collisionless limit: while static solution corresponding to drift state and tilted state can be found, they cannot be realized dynamically without interaction between Landau levels. We also discuss possible manifestation of side-jump effect due to both boost and rotation, with the latter due to the presence of background magnetic field.

    ↳ hep-phnucl-thPRD(2020)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE