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        Mass Measurements of Very Neutron-Deficient Mo and Tc Isotopes and Their Impact on rp Process Nucleosynthesis

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        1103.5321v1.pdf (PDF, 110Kb)
        Author
        Haettner, E.
        Ackermann, D.
        Audi, G.
        Blaum, K.
        Block, M.
        Eliseev, S.
        Fleckenstein, T.
        Herfurth, F.
        Hessberger, F. P.
        Hofmann, S.
        Ketelaer, J.
        Ketter, J.
        Kluge, H. -J.
        Marx, G.
        Mazzocco, M.
        Novikov, Yu. N.
        Plass, W. R.
        Rahaman, S.
        Rauscher, T.
        Rodriguez, D.
        Schatz, H.
        Scheidenberger, C.
        Schweikhard, L.
        Sun, B.
        Thirolf, P. G.
        Vorobjev, G.
        Wang, M.
        Weber, C.
        Attention
        2299/10525
        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 neutrondeficient 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.
        Publication date
        2011-03-21
        Published in
        Physical Review Letters
        Published version
        https://doi.org/10.1103/PhysRevLett.106.122501
        Other links
        http://hdl.handle.net/2299/10525
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