PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·December 9, 2020

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    Nuclear deformation as a source of the non-linearity of King plot in the Yb ion

    Saleh O. Allehabi · V. A. Dzuba · V. V. Flambaum · A. V. Afanasjev

    We perform atomic relativistic many-body calculations of the field isotope shifts and calculations of corresponding nuclear parameters for all stable even-even isotopes of Yb ion. We demonstrate that if we take nuclear parameters of the Yb isotopes from a range of the state-the-art nuclear models which all predict strong quadrupole nuclear deformation, then calculated non-linearity of the King plot, caused by the difference in the deformation in different isotopes, is consistent with the non-linearity observed in the experiment (Ian Counts {\em et al}, Phys. Rev. Lett. {\bf 125}, 123002 (2020)). The changes of nuclear RMS radius between isotopes extracted from experiment are consistent with those obtained in the nuclear calculations.

    ↳ physics.atom-phnucl-thPRA(2021)·36 citations
  2. 06

    On nuclear coalescence in small interacting systems

    M. Kachelriess🇳🇴 · S. Ostapchenko🇷🇺 · J. Tjemsland🇳🇴

    The formation of light nuclei can be described as the coalescence of clusters of nucleons into nuclei. In the case of small interacting systems, such as dark matter and annihilations or collisions, the coalescence condition is often imposed only in momentum space and hence the size of the interaction region is neglected. On the other hand, in most coalescence models used for heavy ion collisions, the coalescence probability is controlled mainly by the size of the interaction region, while two-nucleon momentum correlations are either neglected or treated as collective flow. Recent experimental data from collisions at LHC have been interpreted as evidence for such collective behaviour, even in small interacting systems. We argue that these data are naturally explained in the framework of conventional QCD inspired event generators when both two-nucleon momentum correlations and the size of the hadronic emission volume are taken into account. To include both effects, we employ a per-event coalescence model based on the Wigner function representation of the produced nuclei states. This model reproduces well the source size for baryon emission and the coalescence factor measured recently by the ALICE collaboration in collisions.

    ↳ hep-phnucl-thEPJA(2021)·32 citations

Affiliations

first authorsco-authorsvia INSPIRE