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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.
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Submitted on : Thursday, May 26, 2011 - 3:25:09 PM
Last modification on : Wednesday, September 16, 2020 - 4:17:46 PM

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E. Haettner, D. Ackermann, G. Audi, K. Blaum, M. Block, et al.. Mass measurements of very neutron-deficient Mo and Tc isotopes and their impact on rp process nucleosynthesis. Physical Review Letters, American Physical Society, 2011, 106 (12), pp.122501 ⟨10.1103/PhysRevLett.106.122501⟩. ⟨in2p3-00596112⟩

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