Mass measurements of very neutron-deficient Mo and Tc isotopes and their impact on rp process nucleosynthesis
- 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. M. Wahidur
- Rauscher, T.
- Rodríguez, D.
- Schatz, H.
- Scheidenberger, C.
- Schweikhard, L.
- Sun, B.
- Thirolf, P. G.
- Vorobjev, G.
- Wang, M.
- Weber, C.
Publication date
March 2011
DOI Publisher
American Physical Society (APS)Abstract
Link to online abstract: http://link.aps.org/doi/10.1103/PhysRevLett.106.122501The 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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