New Precision Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>3</mml:mn></mml:mmultiscripts><mml:mo stretchy="false">(</mml:mo><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>4</mml:mn></mml:mmultiscripts><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mtext> </mml:mtext><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">B</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>7</mml:mn></mml:mmultiscripts></mml:math>Cross Section
B. S. Nara SinghDepartment of Particle Physics, Weizmann Institute of Science, Rehovot, IsraelM. HassDepartment of Particle Physics, Weizmann Institute of Science, Rehovot, IsraelY. Nir-ElG. Haquin
2004lv
ABI
Annotatsiya
The $^{3}\mathrm{H}\mathrm{e}(^{4}\mathrm{H}\mathrm{e},\ensuremath{\gamma})\text{ }^{7}\mathrm{B}\mathrm{e}$ reaction plays an important role in determining the high energy solar neutrino flux and in understanding the abundances of primordial $^{7}\mathrm{L}\mathrm{i}$. This Letter reports a new precision measurement of the cross sections of this direct capture reaction, determined by measuring the ensuing $^{7}\mathrm{B}\mathrm{e}$ activity in the region of ${E}_{\mathrm{c}.\mathrm{m}.}=420$ to 950 keV. Various recent theoretical fits to our data result in a consistent extrapolated value of ${S}_{34}(0)=0.53(2)(1)\text{ }\text{ }\mathrm{k}\mathrm{e}\mathrm{V}\text{ }\mathrm{b}$.
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