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