The <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi><mo>,</mo><mi>n</mi></math></span> Cross Section of Boron

R. L. Walker

doi:10.1103/PhysRev.76.244

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The $α, n$ Cross Section of Boron

R. L. Walker^*

University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico

^*Now at Cornell University, Ithaca, New York.

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Phys. Rev. 76, 244 – Published 15 July, 1949

DOI: https://doi.org/10.1103/PhysRev.76.244

Abstract

The differential cross section for the $B^{10, 11} (α, n) N^{13, 14}$ reactions was measured as a function of the alphaparticle energy up to an energy of 5.3 Mev. To determine this cross section, the number of neutrons emitted by boron under alpha-particle bombardment was measured by comparison with a calibrated $Ra - α - Be$ source in a graphite column.

Resonances were observed at alpha-particle energies of 1.8, 2.5, 4.2, 4.9 Mev. Poor resolution may explain why other resonances found by Maurer and by Fünfer were not observed.

References (9)

T. W. Bonner and L. M. Mott-Smith, Phys. Rev. 46, 258 (1934)
W. Maurer, Zeits. f. Physik 107, 721 (1937)
E. Fünfer, Ann. d. Physik 35, 147 (1939)
M. G. Holloway and M. S. Livingston, Phys. Rev. 54, 18 (1938)
O. R. Frisch and R. L. Walker, Los Alamos Declassified Report LADC-155 (1945)
J. H. Roberts, Manhattan Project Report MDDC-731 (1944)
E. Segré and C. Wiegand, Manhattan Project Report MDDC-185 (1944)
E. Fermi, Neutron Physics (Los Alamos Lecture Notes) MDDC-320 (1946)
R. E. Marshak, Rev. Mod. Phys. 19, 185 (1947)

[c1] T. W. Bonner and L. M. Mott-Smith, Phys. Rev. 46, 258 (1934)

[c2] W. Maurer, Zeits. f. Physik 107, 721 (1937)

[c3] E. Fünfer, Ann. d. Physik 35, 147 (1939)

[c4] M. G. Holloway and M. S. Livingston, Phys. Rev. 54, 18 (1938)

[c5] O. R. Frisch and R. L. Walker, Los Alamos Declassified Report LADC-155 (1945)

[c6] J. H. Roberts, Manhattan Project Report MDDC-731 (1944)

[c7] E. Segré and C. Wiegand, Manhattan Project Report MDDC-185 (1944)

[c8] E. Fermi, Neutron Physics (Los Alamos Lecture Notes) MDDC-320 (1946)

[c9] R. E. Marshak, Rev. Mod. Phys. 19, 185 (1947)

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The $α, n$ Cross Section of Boron

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The α,n Cross Section of Boron

Abstract

References (9)

The $α, n$ Cross Section of Boron