Abstract
The magnetic dipole transition strength B(M1) of Ca48 is dominated by a single resonant state at an excitation energy of 10.23 MeV. Experiments disagree about B(M1) and this impacts our understanding of spin flips in nuclei. We performed ab initio computations based on chiral effective field theory and found that B(M1: 0+→1+) lies in the range from 7.0 to 10.2 μN2. This is consistent with a (γ,n) experiment but larger than results from (e,e′) and (p,p′) scattering. Two-body currents yield no quenching of the B(M1) strength and continuum effects reduce it by about 10%. For a validation of our approach, we computed magnetic moments in Ca47,49 and performed benchmark calculations in light nuclei.
| Original language | English |
|---|---|
| Article number | 232504 |
| Journal | Physical Review Letters |
| Volume | 132 |
| Issue number | 23 |
| DOIs | |
| State | Published - Jun 7 2024 |
Funding
We thank Takayuki Miyagi for sharing unpublished results with us. We also thank Mitch Allmond, George Bertsch, Dick Furnstahl, Tim Gray, Augusto Macchiavelli, Takayuki Miyagi, and Achim Schwenk for discussions, and Peter von Neumann-Cosel and Achim Richter for communications. This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Award No. DE-FG02-96ER40963, and the SciDAC-5 NUCLEI Collaboration, and by the Office of High Energy Physics, U.S. Department of Energy under Contract No. DE-AC02-07CH11359 through the Neutrino Theory Network Fellowship awarded to B. A. This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (PRISMA EXC 2118/1) funded by the DFG within the German Excellence Strategy (Project ID 39083149). This work was supported by the NSERC Grant No. SAPIN-2022-00019. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. This research used resources from 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, and from the Digital Research Alliance of Canada. ORNL is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the U.S. Department of Energy. We thank Takayuki Miyagi for sharing unpublished results with us. We also thank Mitch Allmond, George Bertsch, Dick Furnstahl, Tim Gray, Augusto Macchiavelli, Takayuki Miyagi, and Achim Schwenk for discussions, and Peter von Neumann-Cosel and Achim Richter for communications. This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Award No. DE-FG02-96ER40963, and the SciDAC-5 NUCLEI Collaboration, and by the Office of High Energy Physics, U.S. Department of Energy under Contract No. DE-AC02-07CH11359 through the Neutrino Theory Network Fellowship awarded to BA. This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (PRISMA+ EXC 2118/1) funded by the DFG within the German Excellence Strategy (Project ID 39083149). This work was supported by the NSERC Grant No. SAPIN-2022-00019. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. This research used resources from 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, and from the Digital Research Alliance of Canada. ORNL is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the U.S. Department of Energy.