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, Fp
- Hofmann, S
- Ketelaer, J
- Ketter, J
- Kluge, Hj
- Marx, G
- Mazzocco, Marco
- Novikov, Yn
- Plass, Wr
- Rahaman, S
- Rauscher, T
- Rodriguez, D
- Schatz, H
- Scheidenberger, C
- Schweikhard, L
- Sun, B
- Thirolf, Pg
- Vorobjev, G
- Wang, M
- Weber, C.
Publication date
January 2011
DOI Publisher
American Physical Society (APS)Abstract
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 \u3b1 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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