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Nuclear Theory·nucl-th

Monday·July 18, 2022

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    Collective model for cluster motion in Be, C, and O systems

    Yoshiko Kanada-En'yo · Nobuo Hinohara

    A microscopic cluster model was applied to Be, C, and O systems to investigate cluster motion in the ground state and radial excitation. In the microscopic calculation of C and O using the generator coordinate method with the coordinate of the - distance, excited states were obtained as the large-amplitude mode built on the ground state. A collective model was constructed to describe the cluster motion of these states by utilizing inputs from the microscopic cluster model such as the norm kernel and energy expectation values. Furthermore, the cluster model was extended by introducing the imaginary part of the coordinate to incorporate the dynamical effects on the collective mass. The collective wave function obtained with the collective model was found to be in reasonable agreement with the results of the generator coordinate method for energies, root-mean-square radii, and amplitude functions.

    nucl-thPRC(2022)·2 citations
  2. 02

    Path Integral Quantum Monte Carlo Method for Light Nuclei

    Rong Chen🇺🇸

    I describe the first continuous space nuclear path integral quantum Monte Carlo method, and calculate the ground state properties of light nuclei including Deuteron, Triton, Helium-3 and Helium-4, using both local chiral interaction up to next-to-next-to-leading-order and the Argonne interaction. Compared with diffusion based quantum Monte Carlo methods such as Green's function Monte Carlo and auxiliary field diffusion Monte Carlo, path integral quantum Monte Carlo has the advantage that it can directly calculate the expectation value of operators without tradeoff, whether they commute with the Hamiltonian or not. For operators that commute with the Hamiltonian, e.g., the Hamiltonian itself, the path integral quantum Monte Carlo light-nuclei results agree with Green's function Monte Carlo and auxiliary field diffusion Monte Carlo results. For other operator expectations which are important to understand nuclear measurements but do not commute with the Hamiltonian and therefore cannot be accurately calculated by diffusion based quantum Monte Carlo methods without tradeoff, the path integral quantum Monte Carlo method gives reliable results. I show root-mean-square radii, one-particle number density distributions, and Euclidean response functions for single-nucleon couplings. I also systematically describe all the sampling algorithms used in this work, the strategies to make the computation efficient, the error estimations, and the details of the implementation of the code to perform calculations. This work can serve as a benchmark test for future calculations of larger nuclei or finite temperature nuclear matter using path integral quantum Monte Carlo.

    nucl-th0 citations
  3. 03

    SS-HORSE Extension of the No-Core Shell Model: Application to Resonances in

    I. A. Mazur · I. J. Shin · Y. Kim · A. I. Mazur · A. M. Shirokov · P. Maris · J. P. Vary

    Theoretical ab initio studies of resonances in the unbound nucleus are presented. We perform no-core shell model calculations with interactions Daejeon16 and JISP16 and utilize the SS-HORSE method to calculate the matrix for two-body channels and with respectively in the ground and excited states as well as for the four-body democratic decay channel . The resonant energies and widths areobtained by numerical location of the -matrix poles. We describe all experimentally known resonances and suggest an interpretation of an observed wide resonance of unknown spin-parity.

    nucl-thPRC(2022)·15 citations
  4. 04

    Low energy structures in nuclear reactions with 4n in the final state

    Rimantas Lazauskas🇫🇷 · Emiko Hiyama🇯🇵 · Jaume Carbonell🇫🇷

    We present a reaction model to describe the fast removal of the -particle core in He nucleus with eventual emission of four neutrons. The obtained four neutron energy distributions allows to explain the sharp low energy peak observed by studying the missing mass spectra of four neutrons in [Nature Vol. 606, p. 678], as a consequence of dineutron-dineutron correlations.

    nucl-thnucl-exPRL(2023)·44 citations

Affiliations

first authorsco-authorsvia INSPIRE