Low-Energy <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>3</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mi>α</mi><mo>,</mo><mi> </mi><mi>γ</mi><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">Be</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>7</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> Cross-Section Measurements

J. L. Osborne; C. A. Barnes; R. W. Kavanagh; R. M. Kremer; G. J. Mathews; J. L. Zyskind; P. D. Parker; A. J. Howard

doi:10.1103/PhysRevLett.48.1664

Low-Energy ${}^{3}{He} (α, γ) {}^{7}{Be}$ Cross-Section Measurements

J. L. Osborne, C. A. Barnes, R. W. Kavanagh, R. M. Kremer, G. J. Mathews, J. L. Zyskind, P. D. Parker, and A. J. Howard

Phys. Rev. Lett. 48, 1664 – Published 14 June 1982

Abstract

The cross section and branching ratio for ${}^{3}{He} (α, γ) {}^{7}{Be}$ have been measured from $E_{c . m .} = 165 to 1170$ keV by counting prompt $γ$ rays from a windowless, recirculating, ${}^{3}{He}$ gas target. Absolute cross sections were also measured at $E_{c . m .} = 945 and 1250$ keV by measuring the ${}^{7}{Be}$ activity produced in a ${}^{3}{He}$ gas cell with a Ni entrance foil. The inferred zero-energy intercept is $S_{34} (0) = 0.52 \pm 0.03$ keV b. The effect of this extrapolated value on the solar-neutrino problem is discussed.

Received 22 March 1982

DOI:https://doi.org/10.1103/PhysRevLett.48.1664

Authors & Affiliations

J. L. Osborne, C. A. Barnes, R. W. Kavanagh, R. M. Kremer, G. J. Mathews^*, and J. L. Zyskind

W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125

P. D. Parker

A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, and W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125

A. J. Howard