Phys. Rev. Lett. 106, 122501 (2011) [5 pages]Mass Measurements of Very Neutron-Deficient Mo and Tc Isotopes and Their Impact on rp Process Nucleosynthesis
See accompanying Physics Viewpoint The masses of ten proton-rich nuclides, including the N=Z+1 nuclides 85Mo and 87Tc, 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 α 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. © 2011 American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.106.122501
DOI:
10.1103/PhysRevLett.106.122501
PACS:
21.10.Dr, 07.75.+h, 26.30.Ca, 27.50.+e
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