<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mi>α</mi><mo>,</mo><mi>γ</mi><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">O</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>16</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> Capture Cross Section Below 3.2 MeV

Ronald J. Jaszczak; John H. Gibbons; Richard L. Macklin

doi:10.1103/PhysRevC.2.63

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${}^{12}C (α, γ) {}^{16}O$ Capture Cross Section Below 3.2 MeV

Ronald J. Jaszczak, John H. Gibbons, and Richard L. Macklin

Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

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Phys. Rev. C 2, 63 – Published 1 July, 1970

DOI: https://doi.org/10.1103/PhysRevC.2.63

Abstract

The ${}^{12}C (α, γ) {}^{16}O$ capture cross section was measured for $α$ -particle energies between 1.86 MeV ( $σ = 1.1 \pm 0.4$ nb) and 3.11 MeV ( $σ = 29 \pm 4$ nb) using a pulsed ${}^{4}{He}^{+}$ beam from the ORNL 6-MV Van de Graaff accelerator and a 23- by 30-cm NaI(Tl) crystal viewed by six matched, bialkali photomultiplier tubes. An upper limit was obtained for the capture cross section at $E_{α} = 1.6$ MeV. The over-all time resolution (full width at half maximum) of the system for 8-10-MeV pulses due to $γ$ rays is 2.7 nsec. Enriched (99.94%) ${}^{12}C$ targets ranging in thickness from 98 to 178 μg/ ${cm}^{2}$ were used. Pulses resulting from fast neutrons [from the ${}^{13}C (α, n) {}^{16}O$ reaction] interacting with the NaI(Tl) crystal were further separated from true $γ$ pulses through the use of a new technique based on rise-time distribution differences of the respective neutron- and $γ$ -ray-produced pulses. The face of the crystal (shielded with a 10.2 cm thickness of ${}^{6}{LiH}$ ) was 12.2 cm from the target. The astrophysical significance of this reaction in the helium-burning sequence of stellar nucleosynthesis is also discussed.

Comments & Replies

${}^{12}C (α, γ) {}^{16}O$ Capture Cross Section Below 4.1 MeV

Ronald J. Jaszczak and R. L. Macklin

Phys. Rev. C 2, 2452 (1970)

References (14)

E. M. Burbidge, G. R. Burbidge, W. A. Fowler, and F. Hoyle, Rev. Mod. Phys. 29, 547 (1957)
T. Lauritsen and F. Ajzenberg-Selove, K. Way et al.Nuclear Data Sheets, compiled by (Printing and Publishing Office, National Academy of Sciences — National Research Council, Washington, D. C., 1961), NRC 61-5, 6
C. P. Swann and E. R. Metzger, Phys. Rev. 108, 982 (1957)
M. H. Loebenstein, D. W. Mingay, H. Winkler, and C. S. Zaidins, Nucl. Phys. 91, 481 (1967)
T. Tombrello, private communications
J. D. Larson and R. H. Spear, Nucl. Phys. 56, 497 (1964)
A. Adams, H. M. Shapiro, C. A. Barnes, E. G. Adelberger, and W. M. Denny, Bull. Am. Phys. Soc. 13, 698 (1968)
R. J. Jaszczak, Ph. D. thesis, University of Florida, 1968 (unpublished)
G. W. Grodstein, National Bureau of Standards (U.S.), Circular No. 583 (1957)
J. B. Marion and F. C. Young, Nuclear Reaction Analysis (North-Holland Publishing Company, Amsterdam, The Netherlands, 1968), p. 145
Omitted endnote
R. J. Jaszczak, R. Nutt, and R. L. Macklin, Rev. Sci. Instr. 41, 28 (1970)
A. L. Marusak, Oak Ridge National Laboratory Report No. 4299, 1968 (unpublished)
A. K. Hyder, Jr., and D. D. Watson, Aerospace Research Laboratories Report No. ARL-67-0168, 1967 (unpublished)

[c1] E. M. Burbidge, G. R. Burbidge, W. A. Fowler, and F. Hoyle, Rev. Mod. Phys. 29, 547 (1957)

[c2] T. Lauritsen and F. Ajzenberg-Selove, K. Way et al.Nuclear Data Sheets, compiled by (Printing and Publishing Office, National Academy of Sciences — National Research Council, Washington, D. C., 1961), NRC 61-5, 6

[c3] C. P. Swann and E. R. Metzger, Phys. Rev. 108, 982 (1957)

[c4] M. H. Loebenstein, D. W. Mingay, H. Winkler, and C. S. Zaidins, Nucl. Phys. 91, 481 (1967)

[c5] T. Tombrello, private communications

[c6] J. D. Larson and R. H. Spear, Nucl. Phys. 56, 497 (1964)

[c7] A. Adams, H. M. Shapiro, C. A. Barnes, E. G. Adelberger, and W. M. Denny, Bull. Am. Phys. Soc. 13, 698 (1968)

[c8] R. J. Jaszczak, Ph. D. thesis, University of Florida, 1968 (unpublished)

[c9] G. W. Grodstein, National Bureau of Standards (U.S.), Circular No. 583 (1957)

[c10] J. B. Marion and F. C. Young, Nuclear Reaction Analysis (North-Holland Publishing Company, Amsterdam, The Netherlands, 1968), p. 145

[c11] Omitted endnote

[c12] R. J. Jaszczak, R. Nutt, and R. L. Macklin, Rev. Sci. Instr. 41, 28 (1970)

[c13] A. L. Marusak, Oak Ridge National Laboratory Report No. 4299, 1968 (unpublished)

[c14] A. K. Hyder, Jr., and D. D. Watson, Aerospace Research Laboratories Report No. ARL-67-0168, 1967 (unpublished)

Physical Review C

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${}^{12}C (α, γ) {}^{16}O$ Capture Cross Section Below 3.2 MeV

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${}^{12}C (α, γ) {}^{16}O$ Capture Cross Section Below 4.1 MeV

References (14)

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C12(α,γ)O16 Capture Cross Section Below 3.2 MeV

Abstract

Comments & Replies

C12(α, γ)O16 Capture Cross Section Below 4.1 MeV

References (14)

${}^{12}C (α, γ) {}^{16}O$ Capture Cross Section Below 3.2 MeV

${}^{12}C (α, γ) {}^{16}O$ Capture Cross Section Below 4.1 MeV