Capture-Cross-Section Studies for 30—220-keV Neutrons Using a New Technique

R. L. Macklin; J. H. Gibbons

doi:10.1103/PhysRev.159.1007

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Capture-Cross-Section Studies for 30—220-keV Neutrons Using a New Technique

R. L. Macklin and J. H. Gibbons

Oak Ridge National Laboratory, Oak Ridge, Tennessee

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Phys. Rev. 159, 1007 – Published 20 July, 1967

DOI: https://doi.org/10.1103/PhysRev.159.1007

Abstract

Neutron-radiative-capture cross sections have been measured at various energies from 30-220 keV using a new "total-energy-detector" technique of high sensitivity, applicable to small samples of separated stable isotopes. Samples studied are: V, Fe, Ni, ${}^{86}{Sr}$ , ${}^{87}{Sr}$ , Y, Nb, Rh, Ag, ${}^{122}{Te}$ , ${}^{123}{Te}$ , ${}^{124}{Te}$ , ${}^{125}{Te}$ , ${}^{126}{Te}$ , ${}^{128}{Te}$ , ${}^{130}{Te}$ , I, Eu, ${}^{175}{Lu}$ , ${}^{176}{Lu}$ , W, Au, ${}^{204}{Pb}$ , and ${}^{208}{Pb}$ . The odd-odd isotope ${}^{176}{Lu}$ shows a substantially higher cross section than those of neighboring odd-even and even-odd nuclei. The results for europium (2 b near 65 keV) emphasize the peak expected from previous studies of systematics. The Sr and Te isotopic results strongly confirm the predictions of $s$ -process stellar nucleosynthesis.

References (20)

B. C. Diven, J. Terrell, and A. Hemmendinger, Phys. Rev. 120, 556 (1960)
J. H. Gibbons, R. L. Macklin, P. D. Miller, and J. H. Neiler, Phys. Rev. 122, 182 (1961)
N. V. Kononov et al., J. Nucl. Phys. USSR 4, 282 (1966)
A. A. Bergman et al., Conference on the Study of Nuclear Reactions with Neutrons, Antwerp, 1965 (unpublished)
M. C. Moxon and E. R. Rae, in Neutron Time-Of-Flight Methods, edited by J. Spaepen (European Atomic Energy Committee, Brussels, 1961)
R. L. Macklin, J. H. Gibbons, and T. Inada, Nucl. Phys. 43, 353 (1963)
H. Maier-Leibnitz (private communication)
F. Rau, Nucleonik 5, 191 (1963)
R. L. Macklin, P. J. Pasma, and J. H. Gibbons, Phys. Rev. 136, B695 (1964)
J. H. Gibbons and R. L. Macklin, Phys. Rev. 153, 1356 (1967)
Omitted endnote
Omitted endnote
Omitted endnote
R. L. Macklin, Nucl. Instr. Methods 26, 213 (1964)
Omitted endnote
E. M. Burbidge, G. R. Burbidge, W. A. Fowler, and F. Hoyle, Rev. Mod. Phys. 29, 547 (1957)
R. L. Macklin and J. H. Gibbons, Rev. Mod. Phys. 37, 166 (1965)
P. A. Seeger, W. A. Fowler, and D. D. Clayton, Astrophys. J. Suppl. 97, 121 (1965)
R. L. Macklin and J. H. Gibbons, Astrophys. J. (to be published)
A. T. Nelms, Natl. Bur. Std. (U. S.), Circ. No. 542 (1953)

[c1] B. C. Diven, J. Terrell, and A. Hemmendinger, Phys. Rev. 120, 556 (1960)

[c2] J. H. Gibbons, R. L. Macklin, P. D. Miller, and J. H. Neiler, Phys. Rev. 122, 182 (1961)

[c3] N. V. Kononov et al., J. Nucl. Phys. USSR 4, 282 (1966)

[c4] A. A. Bergman et al., Conference on the Study of Nuclear Reactions with Neutrons, Antwerp, 1965 (unpublished)

[c5] M. C. Moxon and E. R. Rae, in Neutron Time-Of-Flight Methods, edited by J. Spaepen (European Atomic Energy Committee, Brussels, 1961)

[c6] R. L. Macklin, J. H. Gibbons, and T. Inada, Nucl. Phys. 43, 353 (1963)

[c7] H. Maier-Leibnitz (private communication)

[c8] F. Rau, Nucleonik 5, 191 (1963)

[c9] R. L. Macklin, P. J. Pasma, and J. H. Gibbons, Phys. Rev. 136, B695 (1964)

[c10] J. H. Gibbons and R. L. Macklin, Phys. Rev. 153, 1356 (1967)

[c11] Omitted endnote

[c12] Omitted endnote

[c13] Omitted endnote

[c14] R. L. Macklin, Nucl. Instr. Methods 26, 213 (1964)

[c15] Omitted endnote

[c16] E. M. Burbidge, G. R. Burbidge, W. A. Fowler, and F. Hoyle, Rev. Mod. Phys. 29, 547 (1957)

[c17] R. L. Macklin and J. H. Gibbons, Rev. Mod. Phys. 37, 166 (1965)

[c18] P. A. Seeger, W. A. Fowler, and D. D. Clayton, Astrophys. J. Suppl. 97, 121 (1965)

[c19] R. L. Macklin and J. H. Gibbons, Astrophys. J. (to be published)

[c20] A. T. Nelms, Natl. Bur. Std. (U. S.), Circ. No. 542 (1953)

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Capture-Cross-Section Studies for 30—220-keV Neutrons Using a New Technique

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