Physics – Nuclear Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1238..139k&link_type=abstract
TOURS SYMPOSIUM ON NUCLEAR PHYSICS AND ASTROPHYSICS-VII. AIP Conference Proceedings, Volume 1238, pp. 139-144 (2010).
Physics
Nuclear Physics
Leptons, Charge Exchange, Elementary Particles, Radiative Transfer, Electroproduction Reactions, Charge-Exchange Reactions, Abundances, Chemical Composition, Radiative Capture
Scientific paper
We study the new type of big-bang nucleosynthesis (BBN) reactions that are catalyzed by a hypothetical long-lived negatively charged, massive leptonic particle (called X-) such as the supersymmetric (SUSY) particle stau, the scalar partner of the tau lepton. It is known that if the X- particle has a lifetime of τX>~103 s, it can capture a light element previously synthesized in standard BBN and form a Coulombic bound state and induces various types of reactions in which X- acts as a catalyst. Some of these X- catalyzed reactions have significantly large cross sections so that the inclusion of the reactions into the BBN network calculation can markedly change the abundances of some elements. We use a high-accuracy three-body calculation method developed by the authors and provide precise cross sections and rates of these catalyzed BBN reactions for use in the BBN network calculation.
Hiyama Emiko
Kamimura Masayasu
Kino Yasushi
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