Mass measurements of very neutron-deficient Mo and Tc isotopes and their impact on rp process nucleosynthesis

Details Mass measurements of very neutron-deficient Mo and Tc isotopes and their impact on rp process nucleosynthesis Mass measurements of very neutron-deficient Mo and Tc isotopes and their impact on rp process nucleosynthesis

2011-03-28

arxiv.org/abs/1103.5321v1

Phys. Rev. Lett. 106, 122501 (2011)

Physics

Nuclear Physics

Nuclear Experiment

Link to online abstract: http://link.aps.org/doi/10.1103/PhysRevLett.106.122501

Scientific paper

10.1103/PhysRevLett.106.122501

The masses of ten proton-rich nuclides, including the N=Z+1 nuclides 85-Mo and 87-Tc, were measured with the Penning trap mass spectrometer SHIPTRAP. Compared to the Atomic Mass Evaluation 2003 a systematic shift of the mass surface by up to 1.6 MeV is observed causing significant abundance changes of the ashes of astrophysical X-ray bursts. Surprisingly low alpha-separation energies for neutron-deficient Mo and Tc are found, making the formation of a ZrNb cycle in the rp process possible. Such a cycle would impose an upper temperature limit for the synthesis of elements beyond Nb in the rp process.

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