Wed·Aug 17, 2016Wednesday·August 17, 2016

1. 01*

   High-precision quadrupole moment reveals significant intruder component in 33Al20 ground state

   H. Heylen🇧🇪 · M. De Rydt🇧🇪 · G. Neyens🇧🇪 · M.L. Bissell🇧🇪 · L. Caceres🇫🇷 · R. Chevrier🇫🇷 · J.M. Daugas🇫🇷 · Y. Ichikawa🇯🇵 · Y. Ishibashi🇯🇵 · O. Kamalou🇫🇷 · T.J. Mertzimekis🇬🇷 · P. Morel🇫🇷 and 9 other authors

   The electric quadrupole moment of the 33Al20 ground state, located at the border of the island of inversion, was obtained using continuous-beam beta-detected nuclear quadrupole resonance (beta-NQR). From the measured quadrupole coupling constant Q = 2.31(4) MHz in an alpha-Al2O3 crystal, a precise value for the electric quadrupole moment is extracted: Qs= 141(3) mb. A comparison with large-scale shell model calculations shows that 33Al has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N = 20 shell gap. 33Al therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z>14 isotopes.

   nucl-exnucl-thPRC(2016)·18 citations
2. 02*

   Ordering of the $0d_{5/2}$ and $1s_{1/2}$ proton levels in light nuclei

   C. R. Hoffman · B. P. Kay🇺🇸 · J. P. Schiffer🇺🇸

   A survey of the available single-proton data in $A\le 17$ nuclei, along with calculations using a Woods-Saxon potential, show that the ordering of the $0d_{5/2}$ and $1s_{1/2}$ proton orbitals are determined primarily by the proximity of the $s$-state proton energy to the Coulomb barrier. This is analogous to the dependence of the corresponding neutron orbitals in proximity to the neutron threshold, that was previously discussed.

   nucl-exnucl-thPRC(2016)·17 citations
3. 03*

   The magnetic moments and electromagnetic form factors of the decuplet baryons in chiral perturbation theory

   Hao-Song Li🇨🇳 · Zhan-Wei Liu🇦🇺 · Xiao-Lin Chen🇨🇳 · Wei-Zhen Deng🇨🇳 · Shi-Lin Zhu🇨🇳

   We have systematically investigated the magnetic moments and magnetic form factors of the decuplet baryons to the next-to-next-leading order in the framework of the heavy baryon chiral perturbation theory. Our calculation includes the contributions from both the intermediate decuplet and octet baryon states in the loops. We also calculate the charge and magnetic dipole form factors of the decuplet baryons. Our results may be useful to the chiral extrapolation of the lattice simulations of the decuplet electromagnetic properties.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2017)·22 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.