The Disintegration of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mn>91</mn></mrow></msup></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Y</mi></mrow><mrow><mn>9</mn><mn>1</mn><mi>m</mi></mrow></msup></mrow></math></span>

D. P. Ames; M. E. Bunker; L. M. Langer; B. M. Sorenson

doi:10.1103/PhysRev.91.68

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The Disintegration of ${Sr}^{91}$ and $Y^{91 m}$

D. P. Ames^*, M. E. Bunker, L. M. Langer^†, and B. M. Sorenson

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

^*Now at the University of Kentucky, Lexington, Kentucky.
^†Indiana University, Bloomington, Indiana.

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Phys. Rev. 91, 68 – Published 1 July, 1953

DOI: https://doi.org/10.1103/PhysRev.91.68

Abstract

The radiations from the fission product ${Sr}^{91}$ (9.67-hr) and its daughter isomer $Y^{91 m}$ (50.3-min) have been studied using a magnetic lens spectrometer, a high resolution 180° focusing spectrometer, and a scintillation spectrometer. Coincidence measurements were made to check on certain genetic aspects of the decay scheme. Five beta-ray groups are observed with end-point energies and relative intensities of 2.665 Mev, 26.4 percent; 2.03 Mev, 4.1 percent; 1.359 Mev, 29.2 percent; 1.093 Mev, 33.1 percent; and 0.62 Mev, 7.2 percent. The 2.665-Mev group has a shape characteristic of a once forbidden transition involving a spin change of 2 units. Gamma-rays are found with energies of 1.413, 1.025, 0.93, 0.748, 0.645, and 0.5512 Mev. The 50.3-min isomeric level in $Y^{91}$ decays only by gamma-emission to the ground state. The 0.5512-Mev gamma-ray associated with this transition has a $\frac{K}{(L + M)}$ internal conversion ratio of 6.00, which is consistent with an $M 4$ assignment. A disintegration scheme is proposed.

References (13)

O. Kofoed-Hansen and K. O. Nielsen, Phys. Rev. 82, 96 (1951)
Finkle, Katcoff, and Sugarman, Radiochemical Studies: The Fission Products (McGraw-Hill Company, Inc., New York, 1951), Paper No. 74, National Nuclear Energy Series, Plutonium Project Record, vol. 9, Div. IV
M. G. Mayer, Phys. Rev. 78, 16 (1950)
L. E. Glendenin, Radiochemical Studies: The Fission Products (McGraw-Hill Book Company, Inc., New York, 1951), Paper No. 236, National Nuclear Energy Series, Plutonium Project Record, Vol. 9, Div. IV
L. M. Langer, Phys. Rev. 77, 50 (1950)
F. B. Shull and E. Feenberg, Phys. Rev. 75, 1768 (1949)
L. M. Langer and C. S. Cook, Rev. Sci. Instr. 19, 257 (1948)
Graves, Langer, and Moffat, Phys. Rev. 88, 344 (1952)
M. Goldhaber and A. W. Sunyar, Phys. Rev. 83, 906 (1951)
Bell, Cassidy, and Kelley, Phys. Rev. 82, 103 (1951)
Rose, Goertzel, Spinrad, Harr, and Strong, Phys. Rev. 83, 79 (1951)
L. M. Langer and H. C. Price, Jr., Phys. Rev. 76, 186 (1949)
F. B. Shull and C. E. McFarland, Phys. Rev. 87, 216 (1952)

[c1] O. Kofoed-Hansen and K. O. Nielsen, Phys. Rev. 82, 96 (1951)

[c2] Finkle, Katcoff, and Sugarman, Radiochemical Studies: The Fission Products (McGraw-Hill Company, Inc., New York, 1951), Paper No. 74, National Nuclear Energy Series, Plutonium Project Record, vol. 9, Div. IV

[c3] M. G. Mayer, Phys. Rev. 78, 16 (1950)

[c4] L. E. Glendenin, Radiochemical Studies: The Fission Products (McGraw-Hill Book Company, Inc., New York, 1951), Paper No. 236, National Nuclear Energy Series, Plutonium Project Record, Vol. 9, Div. IV

[c5] L. M. Langer, Phys. Rev. 77, 50 (1950)

[c6] F. B. Shull and E. Feenberg, Phys. Rev. 75, 1768 (1949)

[c7] L. M. Langer and C. S. Cook, Rev. Sci. Instr. 19, 257 (1948)

[c8] Graves, Langer, and Moffat, Phys. Rev. 88, 344 (1952)

[c9] M. Goldhaber and A. W. Sunyar, Phys. Rev. 83, 906 (1951)

[c10] Bell, Cassidy, and Kelley, Phys. Rev. 82, 103 (1951)

[c11] Rose, Goertzel, Spinrad, Harr, and Strong, Phys. Rev. 83, 79 (1951)

[c12] L. M. Langer and H. C. Price, Jr., Phys. Rev. 76, 186 (1949)

[c13] F. B. Shull and C. E. McFarland, Phys. Rev. 87, 216 (1952)

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The Disintegration of Sr91 and Y91m

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The Disintegration of ${Sr}^{91}$ and $Y^{91 m}$