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Nuclear Theory·nucl-th

Wednesday·March 10, 2021

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 01

    A proposed solution for the lifetime puzzle of the 229mTh+ isomer

    F. F. Karpeshin (D. I. Mendeleyev Institute for Metrology, Saint-Petersburg, Russia)🇷🇺 · M. B. Trzhaskovskaya (National Research Center Kurchatov Institute - Petersburg Nuclear Physics Institute, Russia)🇷🇺

    With the example of the 229Th nucleus, which is the most likely candidate for the creation frequency standard of a future, the dynamics of the interplay and the relationship of various resonance conversion mechanisms is analyzed. As a result, a solution is proposed for the so-called thorium puzzle, which consisted of a contradiction between the experimental and theoretical lifetimes of Th+ ions. First, the solution demonstrates the dependence of the lifetime of the nuclear isomer on the ambient conditions. Second, it demonstrates the leveling role of the fragmentation of the single-electron levels, which makes the resonance amplification of the electron-nuclear interaction more likely. Both of these trends lead to a probable decrease of the theoretical lifetime towards agreement with experiment.

    nucl-thNPA(2021)·4 citations
  2. 02

    Classification of resonances and pairing effects on -scattering within the HFB framework

    K. Mizuyama · H. Cong Quang · T. Dieu Thuy · T. V. Nhan Hao

    We analyze the properties of the scattering solutions obtained as the pole of the S- and K-matrix with the help of the Jost function framework and the Strum-Liouville theory within the Hartree-Fock-Bogoliubov(HFB) framework, and clarify the scattering solutions which can be defined as the physical state. We found that there are three types of the resonances; "{\it shape resonance}", "{\it particle-type}" and "{\it hole-type quasiparticle resonances}", and another two types of solutions are given as the independent S-matrix and K-matrix poles. The shape resonance is formed by the Hartree-Fock(HF) mean field potential, is not affected by the pairing correlation so much. The particle-type and hole-type quasiparticle resonances originate from the particle and hole states by the configuration mixing effect by pairing. All of resonance are represented by the S-matrix pole which has the corresponding K-matrix pole. Two other types of solutions are given by the independent S-matrix and K-matrix poles. These poles are formed by the HF mean field potential. The effect of pairing for the independent S-matrix pole is small, but the one for the independent K-matrix pole has the remarkable effect. The independent K-matrix pole destroys the quasiparticle resonance as it approaches to the resonance by the pairing effect. The wave function of all resonances have the characteristic structure of the metastable property. However, the metastable structure of the wave function of the quasiparticle resonance can be broken by the independent standing wave solution or the Fano effect.

    nucl-thPRC(2021)·6 citations
  3. 03

    Gross features of the spectrum of the 36Ar nucleus

    Gábor Riczu · József Cseh

    Samples of the spectrum of the 36Ar nucleus are known in different energy windows. In addition to the ground state region (GS), the superdeformed (SD) state is observed, too, and there is a good candidate for the hyperdeformed (HD) one, as well. They are populated in different reactions. We intend to describe the gross features of the spectra of different energies, deformations and reactions in a unified way. We apply the multiconfigurational dynamical symmetry (MUSY). The SU(3) quantum numbers of the shape isomers from previous studies pave the way for this description. The MUSY reproduces the gross features of the spectra to a reasonable approximation. The energy spectrum of the three valleys (GS, SD, HD) indicates that the multiconfigurational symmetry is valid to a good approximation, and different cluster configurations coexist in the shape isomers.

    nucl-thIJMPE(2021)·3 citations
  4. 04

    Determine the neutron skin type by relativistic isobaric collisions

    Hao-jie Xu🇨🇳 · Hanlin Li🇨🇳 · Xiaobao Wang🇨🇳 · Caiwan Shen🇨🇳 · Fuqiang Wang🇨🇳

    The effects of neutron skin on the multiplicity () and eccentricity() in relativistic Ru+Ru and Zr+Zr collisions at GeV are investigated with the Trento model. It is found that the Ru+Ru/Zr+Zr ratios of the distributions and in mid-central collisions are exquisitely sensitive to the neutron skin type (skin vs.~halo). The state-of-the-art calculations by energy density functional theory (DFT) favor the halo-type neutron skin and can soon be confronted by experimental data. It is demonstrated that the halo-type density can serve as a good surrogate for the DFT density, and thus can be efficiently employed to probe nuclear deformities by using elliptic flow data in central collisions. We provide hereby a proof-of-principle venue to simultaneously determine the neutron skin type, thickness, and nuclear deformity.

    nucl-thnucl-exPLB(2021)·92 citations

Affiliations

first authorsco-authorsvia INSPIRE