Neutron transfer reactions on the ground state and isomeric state of a 130Sn beam

Abstract

The structure of nuclei around the neutron-rich nucleus 132Sn is of particular interest due to the vicinity of the Z = 50 and N = 82 shell closures and the r-process nucleosynthetic 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 Holifield Radioactive Ion Beam Facility using particle-gamma coincidence spectroscopy. The uncertainties in the energies of the single-particle-like states have been reduced by more than an order of magnitude using the energies of gamma rays. The previous tentative Jpi values have been confirmed. Decays from high-spin states in 131Sn have been observed following transfer on the isomeric component of the 130Sn beam. 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. There are few measurements of transfer reaction on isomers, and this is the first on an isomer in the 132Sn region.

7 pages, 4 figures

References in corpus (8)

• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• Converged ab initio calculations of heavy nuclei
• Astromers: Nuclear Isomers in Astrophysics
• Enrichment in r-process elements from multiple distinct events in the early Draco dwarf spheroidal galaxy
• Neutron capture on 130Sn during r-process freeze-out
• The impact of isomers on a kilonova associated with neutron star mergers
• $\beta$ and $\beta$-delayed neutron decay of the $N=82$ nucleus ${}_{49}^{131}$In${}_{82}$
• Direct capture in the ${}^{130}$Sn(n,$\gamma$)${}^{131}$Sn and ${}^{132}$Sn(n,$\gamma$)${}^{133}$Sn reactions under $r$-process conditions

Cited by in corpus (5)

• Atlas of Nuclear Isomers -- Second Edition
• In-flight production of an isomeric beam of ${}^{16}$N
• Role of neutron transfer in the reaction mechanism of ${}^9$Be+${}^{169}$Tm, ${}^{181}$Ta, ${}^{187}$Re and ${}^{197}$Au systems
• Nuclear incompressibility and its enduring impact on fusion cross-section
• Systematic study of the propagation of uncertainties to transfer observables