Measurement of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi></math>-Decay Branching Ratios for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Dy</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>1</mn><mn>5</mn><mn>0</mn><mo>,</mo><mn>1</mn><mn>5</mn><mn>1</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Tb</mi></mrow><mrow></mrow><mrow><mi>m</mi></mrow><mrow></mrow><mrow></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>149</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>

C. R. Bingham; D. U. O'Kain; K. S. Toth; R. L. Hahn

doi:10.1103/PhysRevC.7.2575

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Measurement of $α$ -Decay Branching Ratios for ${}^{150, 151}{Dy}$ and ${}^{149}{Tb}^{m}$

C. R. Bingham and D. U. O'Kain^*

K. S. Toth and R. L. Hahn

The University of Tennessee, Knoxville, Tennessee 37916, and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

^*Employee of Oak Ridge Gaseous Diffusion Plant, Oak Ridge, Tennessee. Results reported here were submitted in partial fulfillment of the requirement for a M.S. degree.

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Phys. Rev. C 7, 2575 – Published 1 June, 1973

DOI: https://doi.org/10.1103/PhysRevC.7.2575

Abstract

With the use of the helium-gas-jet technique and a high-resolution Ge(Li) detector $α$ -decay branching ratios were measured for ${}^{150}{Dy}$ , ${}^{151}{Dy}$ , and ${}^{149}{Tb}^{m}$ . Sources containing these activities were produced by bombarding ${}^{141}\Pr$ with ${}^{14}N$ and ${}^{12}C$ ions. They were then assayed for both $α$ -particle and x-ray radioactivity. The branching ratios deduced are as follows: 0.32 ± 0.05 for ${}^{150}{Dy}$ , 0.055 ± 0.008 for ${}^{151}{Dy}$ , and (2.0 ± 0.4) × $10^{- 4}$ for ${}^{149}{Tb}^{m}$ . The ${}^{151}{Dy}$ and ${}^{149}{Tb}^{m}$ ratios were found to be in good agreement with previous measurements. While the ratio deduced for ${}^{150}{Dy}$ is almost midway in value between two earlier determinations, it appears to be in real disagreement with the more precise of the two previous measurements. Consequences of this discrepancy are discussed with respect to published cross-section data and $α$ -decay reduced widths for 84-neutron even-even nuclei. In the course of the investigation the half-life of ${}^{149}{Dy}$ was determined to be 4.6 ± 0.4 min from x-ray decay-curve analyses and 5.1 ± 0.9 min from the initial growth period observed in the decay of the 4.1-h, ${}^{149}{Tb}$ 3.967-MeV $α$ group.

References (23)

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[c1] R. D. Macfarlane and R. D. Griffioen, Nucl. Instrum. Methods 24, 461 (1963)

[c2] R. D. Macfarlane and D. W. Seegmiller, Nucl. Phys. 53, 449 (1964)

[c3] N. A. Golovkov, K. Ya. Gromov, N. A. Lebedev, B. Makhmudov, A. S. Rudnev, and V. G. Chumin, Izv. Akad. Nauk SSSR Ser. Fiz. 31, 1618 (1967) [transl.: Bull. Acad. Sci. USSR Phys. Ser. 31, 1657 (1968)]

[c4] V. G. Chumin, Dubna Report No. 6-3676, 1968 (unpublished)

[c5] W.-D. Schmidt-Ott, R. L. Mlekodaj, and C. R. Bingham, Nucl. Instrum. Methods (to be published)

[c6] J. B. Cumming, in Proceedings of the Symposium on Applications of Computers to Nuclear and Radiochemistry, Gatlinburg, 1962, edited by G. D. O'Kelly (Office of Technical Services, Department of Commerce, Washington, D. C., 1963)

[c7] P. Eskola, Ark. Fys. 36, 477 (1966)

[c8] M. J. Martin and P. H. Blichert-Toft, Nucl. Data A8, 156 (1970)

[c9] A. H. Wapstra, G. J. Nijgh, and R. Van Lieshout, Nuclear Spectroscopy Tables (North-Holland, Amsterdam, 1959)

[c10] A. H. Wapstra and N. B. Gove, Nucl. Data A9, 276 (1971)

[c11] N. B. Gove and M. J. Martin, Nucl. Data A10, 205 (1971)

[c12] K. S. Toth and J. O. Rasmussen, Phys. Rev. 109, 121 (1958)

[c13] I. Mahunka and T. Fenyes, Izv. Akad. Nauk SSSR Ser. Fiz. 29, 1121 (1965) [transl.: Bull. Acad. Sci. USSR Phys. Ser. 29, 1126(1966)]

[c14] R. D. Macfarlane, Phys. Rev. 126, 274 (1962)

[c15] M. P. Avotina and A. V. Zolotavin, Isobaric Nuclei with Mass Number $A = 147$ , issue No. 11 of Properties of Atomic Nuclei (Publishing House "Science," Leningrad Section, Leningrad, 1971)

[c16] J. M. Alexander and G. N. Simonoff, Phys. Rev. 133, B93 (1964)

[c17] E. F. Zganjar, Louisiana State University at Baton Rouge, private communication

[c18] W. G. Winn, H. H. Gutbrod, and M. Blann, Nucl. Phys. A188, 423 (1972)

[c19] J. O. Rasmussen, Phys. Rev. 113, 1593 (1959)

[c20] R. D. Macfarlane, J. O. Rasmussem, and M. Rho, Phys. Rev. 134, B1196 (1964)

[c21] A. Rosen, C. Ekstroem, H. Nyquist, and K. E. Aedelroth, Nucl. Phys. A154, 283 (1970)

[c22] E. Newman, K. S. Toth, R. L. Auble, R. M. Gaedke, M. F. Roche, and B. H. Wildenthal, Phys. Rev. C 1, 1118 (1970)

[c23] M. Goldhaber and A. W. Sunyar, in Alpha-, Beta-, and Gamma-Ray Spectroscopy, edited by K. Siegbahn (North-Holland, Amsterdam, 1965), p. 931

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Measurement of $α$ -Decay Branching Ratios for ${}^{150, 151}{Dy}$ and ${}^{149}{Tb}^{m}$

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Measurement of α-Decay Branching Ratios for Dy150,151 and Tbm149

Abstract

References (23)

Measurement of $α$ -Decay Branching Ratios for ${}^{150, 151}{Dy}$ and ${}^{149}{Tb}^{m}$