A Search for Short-Lived Nuclear Isomers

Theodore C. Engelder

doi:10.1103/PhysRev.90.259

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A Search for Short-Lived Nuclear Isomers

Theodore C. Engelder^*

Yale University, New Haven, Connecticut

^*Now with The Dow Chemical Company, Midland, Michigan.

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Phys. Rev. 90, 259 – Published 15 April, 1953

DOI: https://doi.org/10.1103/PhysRev.90.259

Abstract

A search for short-lived isomeric transitions has been initiated. Using a delayed coincidence apparatus having an over-all resolution of 2× $10^{- 9}$ second, sixteen gamma-transitions were investigated for half-lives in the 2× $10^{- 9}$ to $10^{- 7}$ second range. Metastable states in $K^{41}$ , 1.3 Mev above ground and in ${Ta}^{181}$ , 471 kev above ground were verified, while the remaining transitions were found to have half-lives less than 2× $10^{- 9}$ second. Weisskopf's formula relating spin change and half-life, together with internal conversion information, were applied to these data, and definite spin changes were assigned to five of the transitions.

References (6)

S. DeBenedetti and F. K. McGowan, Phys. Rev. 74, 728 (1948)
V. F. Weisskopf, Phys. Rev. 83, 1073 (1951)
L. G. Elliott, Phys. Rev. 85, 942 (1952)
W. C. Barber, Phys. Rev. 80, 332 (1950)
E. C. Pollard and D. Alburger, Phys. Rev. 74, 926 (1948)
Cork, LeBlanc, Stumpf, and Nester, Phys. Rev. 86, 575 (1952)

[c1] S. DeBenedetti and F. K. McGowan, Phys. Rev. 74, 728 (1948)

[c2] V. F. Weisskopf, Phys. Rev. 83, 1073 (1951)

[c3] L. G. Elliott, Phys. Rev. 85, 942 (1952)

[c4] W. C. Barber, Phys. Rev. 80, 332 (1950)

[c5] E. C. Pollard and D. Alburger, Phys. Rev. 74, 926 (1948)

[c6] Cork, LeBlanc, Stumpf, and Nester, Phys. Rev. 86, 575 (1952)

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A Search for Short-Lived Nuclear Isomers

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