<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:mmultiscripts></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Be</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>astrophysical<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi></mml:mrow></mml:math>factor
T. A. D. BrownCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAC. BordeanuCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAK. A. SnoverCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAD. W. StormCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAD. MelconianCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAA. L. SallaskaCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAS. K. L. SjueCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USAS. TriambakCenter for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
2007lv
ABI
Annotatsiya
We present precision measurements of the $^{3}\mathrm{He}+^{4}\mathrm{He}$ $\ensuremath{\rightarrow}$ $^{7}\mathrm{Be}$ reaction in the range ${E}_{\mathrm{c}.\mathrm{m}.}=0.33$ to 1.23 MeV using a small gas cell and detection of both prompt \ensuremath{\gamma} rays and $^{7}\mathrm{Be}$ activity. Our prompt and activity measurements are in good agreement within the experimental uncertainty of several percent. We find $S(0)=0.595\ifmmode\pm\else\textpm\fi{}0.018$ keV b from fits of the Kajino theory to our data. We compare our results with published measurements, and we discuss the consequences for Big Bang Nucleosynthesis and for solar neutrino flux calculations.
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