<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math></span> Spectrum of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">I</mi></mrow><mrow><mn>129</mn></mrow></msup></mrow></math></span> and Its Decay Scheme

E. der Mateosian; C. S. Wu

doi:10.1103/PhysRev.95.458

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$β$ Spectrum of $I^{129}$ and Its Decay Scheme

E. der Mateosian

C. S. Wu

Brookhaven National Laboratory, Upton, New York

Columbia University, New York, New York

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Phys. Rev. 95, 458 – Published 15 July, 1954

DOI: https://doi.org/10.1103/PhysRev.95.458

Abstract

The decay of $I^{129}$ has been studied with several instruments including a magnetic lens spectrometer, a scintillation spectrometer utilizing a technique in which the activity is introduced into a NaI(Tl) crystal, and a proportional counter. A soft beta radiation whose end-point value is measured to be 150±5 kev and a gamma radiation of 38 kev are observed. The shape of the beta spectrum is studied and the $K$ -conversion coefficient and the $\frac{K}{L}$ conversion ratio for the 38-kev gamma radiation are determined. The beta and gamma radiations are shown to be in coincidence and an upper limit is set for a possible beta branch to the ground state of ${Xe}^{129}$ . Spin assignments are made which agree with shell model theories of the nucleus and with data available on the decay of the 8-day isomer of ${Xe}^{129}$ .

References (9)

Katcoff, Schaeffer, and Hastings, Phys. Rev. 82, 688 (1951) Parker, Creek, Herbert, Lantz, and Martin, Oak Ridge National Laboratory Report ORNL-286, September, 1949 (unpublished)
C. J. Borkowski and A. R. Brosi, Oak Ridge National Laboratory Report ORNL-607, 1950 (unpublished)
M. Goldhaber and A. W. Sunyar, Phys. Rev. 83, 906 (1951)
S. Thulin and I. Bergstrom, Phys. Rev. 85, 1055 (1952)
C. S. Wu, Physica 18, 989 (1952)
B. I. Spinrad and L. B. Keller, Phys. Rev. 84, 1056 (1951)
M. Goldhaber, Physica 18, 1091 (1952)
Scharff-Goldhaber, der Mateosian, Goldhaber, Johnson, and McKeown, Phys. Rev. 83, 480 (1951) E. der Mateosian and A. Smith, 88, 1186 (1952)
J. Davidson, Phys. Rev. 82, 48 (1951)

[c1] Katcoff, Schaeffer, and Hastings, Phys. Rev. 82, 688 (1951) Parker, Creek, Herbert, Lantz, and Martin, Oak Ridge National Laboratory Report ORNL-286, September, 1949 (unpublished)

[c2] C. J. Borkowski and A. R. Brosi, Oak Ridge National Laboratory Report ORNL-607, 1950 (unpublished)

[c3] M. Goldhaber and A. W. Sunyar, Phys. Rev. 83, 906 (1951)

[c4] S. Thulin and I. Bergstrom, Phys. Rev. 85, 1055 (1952)

[c5] C. S. Wu, Physica 18, 989 (1952)

[c6] B. I. Spinrad and L. B. Keller, Phys. Rev. 84, 1056 (1951)

[c7] M. Goldhaber, Physica 18, 1091 (1952)

[c8] Scharff-Goldhaber, der Mateosian, Goldhaber, Johnson, and McKeown, Phys. Rev. 83, 480 (1951) E. der Mateosian and A. Smith, 88, 1186 (1952)

[c9] J. Davidson, Phys. Rev. 82, 48 (1951)

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$β$ Spectrum of $I^{129}$ and Its Decay Scheme

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β Spectrum of I129 and Its Decay Scheme

Abstract

References (9)

$β$ Spectrum of $I^{129}$ and Its Decay Scheme