Abstract
We study nuclear multipole resonances in the framework of the random-phase approximation by using the chiral potential NNLOsat. This potential includes two- and three-body terms that have been simultaneously optimized to low-energy nucleon-nucleon scattering data and selected nuclear structure data. Our main focuses have been the isoscalar monopole, isovector dipole, and isoscalar quadrupole resonances of the closed-shell nuclei, He4, O16,22,24, and Ca40,48. These resonance modes have been widely observed in experiment. In addition, we use a renormalized chiral potential Vlow-k, based on the N3LO two-body potential by Entem and Machleidt [Phys. Rev. C 68, 041001 (2011)10.1103/PhysRevC.68.041001]. This introduces a dependency on the cutoff parameter used in the normalization procedure as reported in previous works by other groups. While NNLOsat can reasonably reproduce observed multipole resonances, it is not possible to find a single cutoff parameter for the Vlow-k potential that simultaneously describes the different types of resonance modes. The sensitivity to the cutoff parameter can be explained by missing induced three-body forces in the calculations. Our results for neutron-rich O22,24 show a mixing nature of isoscalar and isovector resonances in the dipole channel at low energies. We predict that O22 and O24 have low-energy isoscalar quadrupole resonances at energies lower than 5 MeV.
| Original language | English |
|---|---|
| Article number | 054306 |
| Journal | Physical Review C |
| Volume | 97 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 3 2018 |
Funding
Valuable discussions with T. Papenbrock, U. Garg, J. P. Vary and J. C. Pei are gratefully acknowledged. This work has been supported by the National Natural Science Foundation of China under Grants No. 11235001, No. 11320101004, and No. 11575007; and the CUSTIPEN (China-U.S. Theory Institute for Physics with Exotic Nuclei) funded by the U.S. Department of Energy, Office of Science under Grant No. DE-SC0009971. This work was partially supported by the Office of Nuclear Physics, U.S. Department of Energy, under Grants No. DE-FG02-96ER40963 and No. DE-SC0008499 (NUCLEI SciDAC collaboration), the Field Work Proposal ERKBP57 at Oak Ridge National Laboratory (ORNL), and the resources used of the Oak Ridge Leadership Computing Facility located at ORNL, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725. Computer time was partially provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan. ( http://energy.gov/downloads/doe-public-access-plan ).
| Funders | Funder number |
|---|---|
| CUSTIPEN | |
| LLC | |
| Office of Nuclear Physics | DE-SC0008499 |
| Office of Science of the Department of Energy | |
| UT-Battelle | |
| U.S. Department of Energy | |
| Office of Science | |
| Oak Ridge National Laboratory | ORNL |
| National Natural Science Foundation of China | 11320101004, 11235001, 11575007 |