Neutron transfer reactions on the ground and isomeric states of a <sup>130</sup>Sn beam
ORAL
Abstract
The structure of nuclei around 132Sn is of particular interest due to the vicinity of the Z = 50 and N = 82 shell closures and the r-process path. Four states in 131Sn with a strong single-particle-like component have previously been studied via the (d,p) reaction, with limited excitation energy resolution. The 130Sn(9Be,8Be)131Sn and 130Sn(13C,12C)131Sn single-neutron transfer reactions were performed in inverse kinematics at the former Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory using particle-γ coincidence spectroscopy. The uncertainties in the energies of the single-particle-like states have been greatly reduced by using the energies of γ rays. The previous tentative Jπ values have been confirmed. Decays from high-spin states in 131Sn have been observed following transfer on the isomeric component of the 130Sn beam. This is the first measurement of transfer on an isomer in the 132Sn region. The improved energies and confirmed spin-parities of the p-wave states important to the r-process lead to direct-semidirect cross-sections for neutron capture on the ground state of 130Sn at 30 keV that are in agreement with previous analyses. A similar assessment of the impact of neutron-transfer on the isomer would require significant nuclear structure and reaction theory input.
*This work was supported by the DOE, Office of Nuclear Physics under contract number DE-SC001174, DE- FG02-96ER40983, DE-AC05-00OR22725, and DE-FG02-96ER40955 and the NSF under Contract No. NSF- PHY-1067906 and PHY-1812316. This research was sponsored in part by the NNSA under the Stewardship Science Academic Alliances program under contract DE-FG52- 08NA28552 and DE-NA0002132. This research was conducted at the Oak Ridge National Laboratory Holifield Radioactive Ion Beam Facility, a former D.O.E. Office of Science User Facility.The authors are grateful to the HRIBF facility operation staff efforts who made the measurements feasible.
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Presenters
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Kate L Jones
- University of Tennessee
- University of Tennessee, Knoxville