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

Journal Article · Fri Mar 25 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.122501· OSTI ID:21562130

Haettner, E; Plass, W R; Scheidenberger, C ^[1]; Ackermann, D; Block, M; Eliseev, S; Herfurth, F; Hessberger, F P; Hofmann, S; Kluge, H -J ^[2]; Audi, G ^[3]; Blaum, K; Ketter, J ^[4]; Fleckenstein, T ^[5]; Ketelaer, J ^[6]; Marx, G; Schweikhard, L ^[7]; Mazzocco, M ^[8]; Novikov, Yu N; Vorobjev, G ^[9]

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1. II. Physikalisches Institut, Justus-Liebig-Universitaet, 35392 Giessen (Germany); GSI Helmholtzzentrum fuer Schwerionenforschung, 64291 Darmstadt (Germany)
2. GSI Helmholtzzentrum fuer Schwerionenforschung, 64291 Darmstadt (Germany)
3. CSNSM-IN2P3-CNRS, 91405 Orsay-Campus (France)
4. Max-Planck-Institut fuer Kernphysik, 69117 Heidelberg (Germany)
5. II. Physikalisches Institut, Justus-Liebig-Universitaet, 35392 Giessen (Germany)
6. Institut fuer Physik, Johannes Gutenberg-Universitaet, 55128 Mainz (Germany)
7. Institut fuer Physik, Ernst-Moritz-Arndt-Universitaet, 17487 Greifswald (Germany)
8. Dipartimento di Fisica and INFN Sezione di Padova, 35131 Padova (Italy)
9. GSI Helmholtzzentrum fuer Schwerionenforschung, 64291 Darmstadt (Germany); Petersburg Nuclear Physics Institute, 188300 Gatchina, St. Petersburg (Russian Federation)

The masses of ten proton-rich nuclides, including the N=Z+1 nuclides {sup 85}Mo and {sup 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.

• OSTI ID: 21562130
• Journal Information: Physical Review Letters, Vol. 106, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.106.122501; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABUNDANCE
ASTROPHYSICS
BINDING ENERGY
MASS
MASS SPECTROMETERS
MEV RANGE 01-10
MOLYBDENUM 85
NEUTRONS
NUCLEOSYNTHESIS
PROTONS
SURFACES
TECHNETIUM 87
TRAPS
X RADIATION
BARYONS
BETA DECAY RADIOISOTOPES
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MEASURING INSTRUMENTS
MEV RANGE
MOLYBDENUM ISOTOPES
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PHYSICS
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTROMETERS
SYNTHESIS
TECHNETIUM ISOTOPES