Slow Neutron Resonances in Holmium, Thulium, and Lutetium

H. L. Foote, Jr; H. H. Landon; V. L. Sailor

doi:10.1103/PhysRev.92.656

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Slow Neutron Resonances in Holmium, Thulium, and Lutetium

H. L. Foote, Jr.^*, H. H. Landon, and V. L. Sailor

Brookhaven National Laboratory, Upton, New York

^*Doctoral candidate from the University of Utah.

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Phys. Rev. 92, 656 – Published 1 November, 1953

DOI: https://doi.org/10.1103/PhysRev.92.656

Abstract

The total cross sections of holmium, thulium, and lutetium have been measured over the neutron energy range from 0.1 to ∼30 ev. Resonances were found in ${Ho}^{165}$ at 3.96, 12.8, 19, 22, and 39 ev; in ${Tm}^{169}$ at 3.92 14.8, and 17.6 ev. Of the many resonances found in lutetium, the following tentative isotopic assignments have been made: ${Lu}^{175}$ —resonances at 5.30, 11.4, 14.4, 20.6, 24, and 31 ev; ${Lu}^{176}$ —resonances at 0.142, 1.57 2.62, and 4.80. It is probable that many additional resonances are present at higher energies in ${Lu}^{176}$ but were not observed. The average spacing between resonances in ${Ho}^{165}$ , ${Tm}^{169}$ , and ${Lu}^{175}$ (odd-even isotopes) is estimated to be of the same order of magnitude; i.e., respectively 10, 10, and 6 ev; while the spacing in ${Lu}^{176}$ (odd-odd) appears to be much smaller, of the order of 1 to 2 ev. Parameters for several of the resonances have been obtained.

References (15)

Foote, Sailor, and Landon, Phys. Rev. 90, 362 (1953)
H. Pomerance, Phys. Rev. 83, 641 (1951)
H. Bomke and H. Reddemann, Z. Physik 120, 56 (1943) W. Riezler, Ann. Phys. 41, 476 (1942) Atterling, Bohr, and Sigurgeirsson, Arkiv Mat. Astron. Fysik 32A, No. 2 (1946) W. Bothe, Z. Naturforsch 1, 179 (1946) Seren, Friedlander, and Turkel, Phys. Rev. 72, 888 (1947) H. Pomerance, Oak Ridge National Laboratory Reports ORNL-577, 33, 1949 and ORNL-366, 47, 1949 (unpublished)
T. E. Stephenson, Oak Ridge National Laboratory Report ORNL-1068, 1951 (unpublished)
Bernstein, Borst, Stanford, Stephenson, and Dial, Phys. Rev. 87, 487 (1952)
F. W. Aston, Proc. Roy. Soc. (London) A146, 46 (1934) W. T. Leland, Phys. Rev. 77, 634 (1950)
J. Mattauch and H. Lichtblau, Z. Physik 111, 514 (1939)
Hughes, Garth, and Levin, Phys. Rev. 91, 1423 (1953)
L. B. Borst and V. L. Sailor, Rev. Sci. Instr. 24, 141 (1953)
F. H. Spedding (private communication)
Omitted endnote
V. L. Sailor, Phys. Rev. 91, 53 (1953)
E. Melkonian, Phys. Rev. 90, 362 (1953)
E. P. Wigner, Phys. Rev. 70, 606 (1946)
W. W. Havens, Jr. and T. I. Taylor, Nucleonics 6, No. 2, 66 (1950)

[c1] Foote, Sailor, and Landon, Phys. Rev. 90, 362 (1953)

[c2] H. Pomerance, Phys. Rev. 83, 641 (1951)

[c3] H. Bomke and H. Reddemann, Z. Physik 120, 56 (1943) W. Riezler, Ann. Phys. 41, 476 (1942) Atterling, Bohr, and Sigurgeirsson, Arkiv Mat. Astron. Fysik 32A, No. 2 (1946) W. Bothe, Z. Naturforsch 1, 179 (1946) Seren, Friedlander, and Turkel, Phys. Rev. 72, 888 (1947) H. Pomerance, Oak Ridge National Laboratory Reports ORNL-577, 33, 1949 and ORNL-366, 47, 1949 (unpublished)

[c4] T. E. Stephenson, Oak Ridge National Laboratory Report ORNL-1068, 1951 (unpublished)

[c5] Bernstein, Borst, Stanford, Stephenson, and Dial, Phys. Rev. 87, 487 (1952)

[c6] F. W. Aston, Proc. Roy. Soc. (London) A146, 46 (1934) W. T. Leland, Phys. Rev. 77, 634 (1950)

[c7] J. Mattauch and H. Lichtblau, Z. Physik 111, 514 (1939)

[c8] Hughes, Garth, and Levin, Phys. Rev. 91, 1423 (1953)

[c9] L. B. Borst and V. L. Sailor, Rev. Sci. Instr. 24, 141 (1953)

[c10] F. H. Spedding (private communication)

[c11] Omitted endnote

[c12] V. L. Sailor, Phys. Rev. 91, 53 (1953)

[c13] E. Melkonian, Phys. Rev. 90, 362 (1953)

[c14] E. P. Wigner, Phys. Rev. 70, 606 (1946)

[c15] W. W. Havens, Jr. and T. I. Taylor, Nucleonics 6, No. 2, 66 (1950)

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Slow Neutron Resonances in Holmium, Thulium, and Lutetium

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