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

Abstract

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.

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

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• Neutrino-nucleus reactions and their role for supernova dynamics and nucleosynthesis
• Dependence of X-ray Burst Models on Nuclear Masses
• Storage ring mass spectrometry for nuclear structure and astrophysics research
• Beta-delayed proton emission in the 100Sn region
• Mass Measurements of Neutron-Deficient Y, Zr, and Nb Isotopes and Their Impact on $rp$ and $\nu p$ Nucleosynthesis Processes
• Uncertainties in $\nu$p-process nucleosynthesis from Monte Carlo variation of reaction rates
• Atomic masses of intermediate-mass neutron-deficient nuclei with relative uncertainty down to 35-ppb via multireflection time-of-flight mass spectrograph
• Probing the quantum phase transition around $N\approx 60$ via mass measurements of technetium isotopes