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Journal Article

Mass measurements of neutron-rich nuclei near N = 70


George,  S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Wang, K.-L., Estrade, A., Famiano, M., Schatz, H., Barber, M., Baumann, T., et al. (2024). Mass measurements of neutron-rich nuclei near N = 70. Physical Review C, 109(3): 035806. doi:10.1103/PhysRevC.109.035806.

Cite as: https://hdl.handle.net/21.11116/0000-000F-1BD7-1
The astrophysical origin for the chemical elements between the first and second r-process peaks is a matter of intense debate, with a number of nucleosynthesis processes at explosive stellar environments possibly contribut- ing to their production. Reliable data on the trends of neutron separation energies of neutron-rich isotopes are required to model neutron-capture processes that would produce these elements. Masses of 104Y, 106Zr, 112Mo, and 115Tc have been measured with the time-of-flight-magnetic-rigidity (ToF-Bρ) technique at the National Superconducting Cyclotron Laboratory at Michigan State University. The experiment is the first application of the ToF-Bρ technique at the S800 spectrograph that reached the mass region relevant to heavy-element nucleosynthesis. The two-neutron separation energy deduced from the measured masses exhibits a smooth trend consistent with the theoretical predictions within the range of experimental uncertainty, indicating that there is no sudden shape transition in these isotopes as hinted at by previous data.