Constraining Electron Capture Rates with (d,<sup>2</sup>He) Reactions in Inverse Kinematics
ORAL · Invited
Abstract
Electron-capture (EC) rates play a decisive role in core-collapse and thermonuclear supernovae, the crust of accreting neutron stars in binary systems, and the final core evolution of intermediate mass stars. Charge-exchange reactions (CERs) at intermediate energies (~100 MeV) are crucial in extracting information for neutron-rich nuclei as the EC Q-values are positive for such nuclei. The differential cross sections in CERs at zero momentum transfer are proportional to the Gamow-Teller strength, B(GT), from which the EC rates can be calculated. In a first of a kind experiment, the S800 spectrometer at National Superconducting Cyclotron Laboratory (NSCL) along with Active-Target Time Projection Chamber (AT-TPC) setup was used to run an experiment with (d,2He) probe in inverse kinematics to study unstable nuclei. Data from the experiment for the 14O(d,2He)14N and 13N(d,2He)13C reactions have been analyzed to extract the differential cross section for ground and excited states and the extracted B(GT) is in good agreement with theory and existing data.
*This work was supported by the U.S. National Science Foundation under Grants No. PHY-1913554 (Windows on the Universe: Nuclear Astrophysics at the NSCL), No. PHY-1430152 (JINA Center for the Evolution of the Elements), No. PHY-2209429 Windows on the Universe: Nuclear Astrophysics at FRIB, and No. PHY-2110365 (Nuclear Structure Theory and its Applications to Nuclear Properties, Astrophysics and Fundamental Physics). The A. T. T. P. C. was partially funded by the U.S. National Science Foundation under Grant No. MRI-0923087. This material is also based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics and used resources of the Facility for Rare Isotope Beams (FRIB), which is a U.S. DOE Office of Science User Facility under Award No. DE-SC0000661.
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Publication:Giraud et al. Phys. Rev. Lett., vol. 130, p. 232301, 2023 (B+ Gamow-Teller strengths from unstable 14O via the (d,2He) reaction in inverse kinematics). Extraction of Gamow-Teller strength using (d,2He) reaction for rare isotopes (will be submitted to PRC).
