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Nuclear Theory·nucl-th

Friday·March 16, 2018

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    pairing in multi-strange hypernuclei

    H. Güven🇹🇷 · K. Bozkurt🇹🇷 · E. Khan🇫🇷 · J. Margueron🇺🇸

    Multi-strange Ca, Sn and Pb hypernuclei with pairing interaction are investigated within the Hartree-Fock-Bogoliubov approach. The unknown pairing strength is calibrated to match with the maximal value for the prediction of the pairing gap in uniform matter for densities and isospin asymmetries equivalent to those existing in multi- hypernuclei. In this way, we provide an upper bound for the prediction of the pairing gap and its effects in hypernuclei. The condensation energy is predicted to be about 3~MeV as a maximum value, yielding small corrections on density distributions and shell structure. In addition, conditions on both Fermi energies and orbital angular momenta are expected to quench the nucleon- pairing for most of hypernuclei.

    nucl-thPRC(2018)·17 citations
  2. 02

    Theoretical study of the Lambda(1405) resonance in Xi_b^0 -> D^0 pi Sigma decay

    Kenta Miyahara🇯🇵 · Tetsuo Hyodo🇯🇵

    We study the mechanism of the weak decay process of Xi_b^0 into D^0 with a meson-baryon pair. It is shown that the dominant component of the prompt weak decay produces the meson-baryon pair with the spectator strange quark being transferred to the baryon, so that the Kbar N channel is absent. Subsequent final state interaction then reflects the pi Sigma originated Lambda(1405) formation amplitude, which has been difficult to access in previous experimental studies. We predict the line shapes of the pi Sigma invariant mass distribution using a realistic chiral meson-baryon amplitude for the final state interaction. It is shown that the interference between the direct and the rescattering contributions can strongly distort the peak structure of the Lambda(1405) in the mass distribution. This indicates the necessity of a detailed investigation of the reaction mechanism in order to extract the Lambda(1405) property in the pi Sigma mass distribution.

    nucl-thhep-phPRC(2018)·11 citations
  3. 03

    Effective field theory for collective rotations and vibrations of triaxially deformed nuclei

    Q. B. Chen · N. Kaiser · Ulf-G. Meißner · J. Meng

    The effective field theory (EFT) for triaxially deformed even-even nuclei is generalized to include the vibrational degrees of freedom. The pertinent Hamiltonian is constructed up to next-to-leading order. The leading order part describes the vibrational motion, and the NLO part couples rotations to vibrations. The applicability of the EFT Hamiltonian is examined through the description of the energy spectra of the ground state bands, -bands, and bands in the Ru isotopes. It is found that by taking into account the vibrational degrees of freedom, the deviations for high-spin states in the -band observed in the EFT with only rotational degrees of freedom disappear. This supports the importance of including vibrational degrees of freedom in the EFT formulation for the collective motion of triaxially deformed nuclei.

    nucl-thPRC(2018)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE