Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 38: Nuclear Astrophysics

HK 38.3: Vortrag

Dienstag, 17. März 2009, 17:30–17:45, H-ZO 60

Constraining Nucleosynthesis in Type I X-Ray Bursts through Mass Measurements — •Anuj Parikh^1,2, Jordi José^2,3, Christian Iliadis^4,5, Fermin Moreno², and Thomas Rauscher⁶ — ¹Physik Department E12, Technische Universität München, D-85748 Garching, Germany — ²Departament de Física i Enginyeria Nuclear, EUETIB, Universitat Politècnica de Catalunya, E-08036 Barcelona, Spain — ³Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain — ⁴Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599-3255, USA — ⁵Triangle Universities Nuclear Laboratory, Durham, NC 27708-0308, USA — ⁶Department of Physics, University of Basel, CH-4056 Basel, Switzerland

Type I X-ray bursts are explosive stellar events resulting from thermonuclear ignition in the H/He-rich envelopes of accreting neutron stars. Nucleosynthesis in these phenomena may involve up to several thousand nuclear processes. Those reactions with small Q-values (less than 1 MeV) are of particular interest in these environments as they may represent waiting points for a continuous abundance flow towards heavier-mass nuclei. We have performed a comprehensive series of post-processing calculations which examine the sensitivity of nucleosynthesis in type I X-ray bursts to uncertainties in both reaction rates and reaction Q-values. We discuss the relatively few critical masses for which measurements could better constrain the results of our studies. In particular, we stress the importance of measuring the masses of ⁶⁵As and ⁶⁶Se.