Gamma-Ray Spectra of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Cu</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>64</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Cu</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>66</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> Following Resonant-Neutron Capture

W. E. Stein; B. W. Thomas; E. R. Rae

doi:10.1103/PhysRevC.1.1468

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Gamma-Ray Spectra of ${}^{64}{Cu}$ and ${}^{66}{Cu}$ Following Resonant-Neutron Capture

W. E. Stein

B. W. Thomas and E. R. Rae

University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87544

Atomic Energy Research Establishment, Harwell, Didcot, Berkshire, England

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Phys. Rev. C 1, 1468 – Published 1 April, 1970

DOI: https://doi.org/10.1103/PhysRevC.1.1468

Abstract

$γ$ -ray spectra following thermal- and resonant-neutron capture in copper have been studied using the Harwell electron linear accelerator and a lithium-drifted germanium detector. The energy resolution of the $γ$ -ray spectrometer was about 14 keV over the neutron energy range from thermal to 2.7 keV. In addition to a thermal-neutron spectrum taken with a natural copper sample, the data include capture— $γ$ -ray spectra for the 0.577-, 2.06-, and 2.66-keV resonances in ${}^{63}{Cu} (n, γ) {}^{64}{Cu}$ , and the 0.229-keV resonance in ${}^{65}{Cu} (n, γ) {}^{66}{Cu}$ . An analysis of the strengths of 91 assumed $E 1$ transitions in the ${}^{63}{Cu} (n, γ) {}^{64}{Cu}$ resonant data gave a best fit to a $χ^{2}$ function with 1.0±0.2 degrees of freedom. The intensities of the four highest-energy transitions in the same reaction are observed to decrease by more than a factor of 6 as the neutron energy increases from thermal to 2.66 keV. A number of strong transitions approximately 3 MeV below the neutron binding energy is observed in the first resonance of both isotopes. Tentative spin assignments are given for the 0.229-keV resonance in ${}^{65}{Cu}$ . If the resonance is due to capture of $s$ -wave neutrons, the spin and parity are $2^{-}$ . For capture of neutrons with higher partial waves, the spin is restricted to either 2 or 3 with the parity determined by the relative orbital angular momentum.

References (29)

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[c1] G. A. Bartholomew and B. B. Kinsey, Phys. Rev. 89, 386 (1953)

[c2] L. V. Groshev, A. M. Demidov, V. N. Lutsenko, and V. I. Pelekhov, in J. B. SykesAtlas of Thermal Neutron Capture Gamma Rays, translated by (Pergamon Publishing Corp., New York, 1959), p. 95

[c3] A. H. Colenbrander and T. J. Kennett, Can. J. Phys. 45, 2395 (1967)

[c4] E. B. Shera and H. H. Bolotin, Phys. Rev. 169, 940 (1968)

[c5] R. P. de Figueiredo, M. Mazari, and W. W. Buechner, Phys. Rev. 112, 873 (1958)

[c6] S. A. Hjorth and L. H. Allen, Arkiv Fysik 33, 207 (1966)

[c7] O. A. Wasson and J. E. Draper, Phys. Rev. 137, B1175 (1965)

[c8] G. F. Auchampaugh, Ph.D. thesis, University of California, Davis, 1968 (unpublished)

[c9] C. E. Porter and R. G. Thomas, Phys. Rev. 104, 483 (1956)

[c10] I. Bergqvist and N. Starfelt, Arkiv Fysik 23, 435 (1962)

[c11] J. R. Bird, J. H. Gibbons, and W. M. Good, in Proceedings of the Conference on Direct Interactions and Nuclear Reaction Mechanisms, Padua, 1962, edited by E. Clemental and C. Villi (Gordon and Breach Science Publishers, Inc., New York, 1963), p. 305

[c12] B. J. Allen, Nucl. Phys. A111, 1 (1968)

[c13] W. M. Good and E. R. Rae, Atomic Energy Research Establishment Report No. AERE NP/GEN 21 (unpublished), Chap. 4

[c14] M. J. Poole and E. R. Wiblin, in Proceedings of the Second United Nations International Conference on Peaceful Uses of Atomic Energy (United Nations, Geneva, Switzerland, 1958), Vol. 14, p. 266

[c15] Omitted endnote

[c16] M. J. PooleE. R. WiblinD. J. Hughes and R. B. SchwartzNeutron Cross Sections, compiled by (U.S. Government Printing Office, Washington, D.C., 1958), 2nd ed., Suppl. 2

[c17] M. C. Moxon (private communication)

[c18] M. C. Moxon and E. R. Rae, Nucl. Instr. Methods 24, 445 (1963)

[c19] L. V. Groshev, A. M. Demidov, and V. N. Lutsenko, Izv. Akad. Nauk SSSR, Ser. Fiz. 24, 833 (1960) L. V. Groshev, A. M. Demidov, V. A. Ivanov, V. N. Lutsenko, and V. I. Pelekhov, 27, 1977 (1963)

[c20] Nuclear Data Sheets, compiled by K. Way et al. (Printing and Publishing Office, National Academy of Sciences—National Research Council, Washington 25, D.C., 1961), NRC 59-2-13 and NRC 59-2-16

[c21] J. Vervier, Nucl. Phys. 26, 10 (1961) G. A. Bartholomew and J. Vervier, ibid. 50, 209 (1964)

[c22] J. Kopecky, J. Kajfosz, and B. Chalupa, Nucl. Phys. 68, 449 (1965)

[c23] G. A. Bartholomew, Ann. Rev. Nucl. Sci. 11, 259 (1961)

[c24] L. V. Groshev, A. M. Demidov, V. N. Lutsenko, and V. I. Pelekhov, in Proceedings of the Second United Nations International Conference on the Peaceful Uses of Atomic Energy (United Nations, Geneva, Switzerland, 1958), Vol. 15, p. 138

[c25] A. M. Lane and J. E. Lynn, Nucl. Phys. 17, 586 (1960)

[c26] Nuclear Data Sheets, compiled by K. Way et al. (Printing and Publishing Office, National Academy of Sciences—National Research Council, Washington 25, D.C., 1961), NRC 60-4-23 and NRC 60-4-24

[c27] W. W. Daehnick and Y. S. Park, Phys. Rev. Letters 20, 110 (1968)

[c28] H. E. Jackson, J. Julien, C. Samour, A. Bloch, C. Lopata, and J. Morgenstern, Phys. Rev. Letters 17, 656 (1966)

[c29] E. R. Rae, W. R. Moyer, R. R. Fullwood, and J. L. Andrews, Phys. Rev. 155, 1301 (1967)

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Gamma-Ray Spectra of ${}^{64}{Cu}$ and ${}^{66}{Cu}$ Following Resonant-Neutron Capture

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Gamma-Ray Spectra of Cu64 and Cu66 Following Resonant-Neutron Capture

Abstract

References (29)

Gamma-Ray Spectra of ${}^{64}{Cu}$ and ${}^{66}{Cu}$ Following Resonant-Neutron Capture