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首页> 外文期刊>The Astrophysical Journal. Supplement Series >REVISED BIG BANG NUCLEOSYNTHESIS WITH LONG-LIVED, NEGATIVELY CHARGED MASSIVE PARTICLES: UPDATED RECOMBINATION RATES, PRIMORDIAL ~9Be NUCLEOSYNTHESIS, AND IMPACT OF NEW ~6Li LIMITS
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REVISED BIG BANG NUCLEOSYNTHESIS WITH LONG-LIVED, NEGATIVELY CHARGED MASSIVE PARTICLES: UPDATED RECOMBINATION RATES, PRIMORDIAL ~9Be NUCLEOSYNTHESIS, AND IMPACT OF NEW ~6Li LIMITS

机译：修订版的具有长寿命负电荷大颗粒的大爆炸核合成：更新的重组率，主要的〜9Be核合成和新的〜6Li限制的影响

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extensively reanalyze the effects of a long-lived, negatively charged massive particle, X~-, on big bang nucleosynthesis (BBN). The BBN model with an X~- particle was originally motivated by the discrepancy between the ~(6,7)Li abundances predicted in the standard BBN model and those inferred from observations of metal-poor stars. In this model, ~7Be is destroyed via the recombination with an X~- particle followed by radiative proton capture. We calculate precise rates for the radiative recombinations of ~7Be, ~7Li, ~9Be, and ~4He with X~-. In nonresonant rates, we take into account respective partial waves of scattering states and respective bound states. The finite sizes of nuclear charge distributions cause deviations in wave functions from those of point-charge nuclei. For a heavy X~- mass, m_X ? 100 GeV, the d-wave→2P transition is most important for ~7Li and ~(7,9)Be, unlike recombination with electrons. Our new nonresonant rate of the ~7Be recombination for m_X = 1000 GeV is more than six times larger than the existing rate. Moreover, we suggest a new important reaction for ~9Be production: the recombination of ~7Li and X~- followed by deuteron capture. We derive binding energies of X nuclei along with reaction rates and Q values. We then calculate BBN and find that the amount of ~7Be destruction depends significantly on the charge distribution of ~7Be. Finally, updated constraints on the initial abundance and the lifetime of the X~- are derived in the context of revised upper limits to the primordial ~6Li abundance. Parameter regions for the solution to the ~7Li problem and the primordial ~9Be abundances are revised.
机译：广泛地重新分析了一个长寿命的，带负电荷的大颗粒X〜-对大爆炸核合成（BBN）的影响。带有X〜-粒子的BBN模型最初是由标准BBN模型中预测的〜（6,7）Li丰度与从贫金属恒星的观测结果推断出的丰度之间的差异引起的。在该模型中，〜7Be通过与X〜-粒子的重组被破坏，然后被辐射质子捕获。我们用X〜-计算〜7Be，〜7Li，〜9Be和〜4He的辐射复合的精确速率。在非谐振速率下，我们考虑了散射状态和束缚状态的各个分波。核电荷分布的有限大小会导致波函数与点电荷核的波函数发生偏差。对于沉重的X〜-质量，m_X？与电子的复合不同，对于100〜100 GeV，对于〜7Li和〜（7,9）Be，d波→2P跃迁最为重要。对于m_X = 1000 GeV，我们新的〜7Be重组的非共振速率比现有速率大六倍以上。此外，我们建议〜9Be产生一个新的重要反应：〜7Li和X〜-的重组，然后进行氘核捕获。我们推导出X核的结合能以及反应速率和Q值。然后，我们计算BBN，发现〜7Be的破坏量在很大程度上取决于〜7Be的电荷分布。最后，在原始〜6Li丰度的修订上限的背景下，推导了X_-的初始丰度和寿命的更新约束。修改了〜7Li问题和原始〜9Be丰度的参数区域。

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