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Cross sections for production of 6He, 6Li, 7Li, and 7Be in the alpha+alphareaction were measured at bombarding energies of 159.3, 279.6, and 619.8 MeV,and are found to decrease rapidly with increasing energy. These cross sectionsare essential for the calculation of the rate of nucleosynthesis of the lithiumisotopes in the cosmic rays and thereby play a key role in our understanding ofthe synthesis of Li, Be, and B. The results for 6Li differ significantly fromthe tabulated values commonly used in cosmic-ray production calculations andlead to lower production of 6Li.Comment: 20 pages, 8 figures, Submitted to Physical Review

physical review. c. nuclear physics/physical review. c, nuclear physics

Production of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>6</mml:mn><mml:mo>,</mml:mo><mml:mn>7</mml:mn><mml:mn /></mml:math>nuclides in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi><mml:mo>+</mml:mo><mml:mi>α</mml:mi></mml:math>reaction and cosmic ray nucleosynthesis

Production ofA=6,7nuclides in theα+αreaction and cosmic ray nucleosynthesis