Big-Bang Nucleosynthesis Reactions Catalyzed by a Long-Lived Negatively Charged Leptonic Particle(Nuclear Physics)
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概要
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An accurate quantum three-body calculation is performed for 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 τ_X≳10^3s, it can capture a light element previously synthesized in standard BBN and form a Coulombic bound state, for example, (^7BeX^-) at temperature T_9≲0.4 (in units of 10^9K), (αX^-) at T_9≲0.1 and (pX^-) at T_9≲0.01. The bound state, an exotic atom, is expected to induce the following reactions in which X^- acts as a catalyst: i) α-transfer reactions such as (αX^-)+d→^6Li+X, ii) radiative capture reactions such as (^7BeX^-)+p→(^8BX^-)+γ, iii) three-body breakup reactions such as (^7LiX^-)+p→α+α+X^-, iv) charge-exchange reactions such as (pX^-)+α→(αX^-)+p and v) neutron induced reactions such as (^8BeX^-)+n→^9Be+X^-. In recent papers it has been claimed that 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, giving not only a solution to the ^6Li-^7Li problem (the calculated underproduction of ^6Li by a factor of 〜1000 and overproduction of ^7Li+^7Be by a factor of 〜3) but also a constraint on the lifetime and primordial abundance of the elementary particle X^-. However, most of these calculations of the reaction cross sections in the literature were performed assuming too naive models or approximations that are unsuitable for these complicated low-energy nuclear reactions. We use a high-accuracy few-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.
- 2009-05-25
著者
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Hiyama Emiko
Riken Nishina Center
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Kamimura Masayasu
Department Of Physics Kyushu University
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Kino Yasushi
Department Of Chemistry Tohoku University
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Kino Yasushi
Department Of Chemistry Graduate School Of Science Tohoku University
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HIYAMA Emiko
RIKEN
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KAMIMURA Masayasu
Department of Physics, Kyushu University:RIKEN Nishina Center
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