Gamma production cross sections from 14-MeV neutron bombardment of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Y</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>89</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

F. S. Dietrich; M. C. Gregory; J. D. Anderson

doi:10.1103/PhysRevC.9.973

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Gamma production cross sections from 14-MeV neutron bombardment of ${}^{89}Y$

F. S. Dietrich, M. C. Gregory^*, and J. D. Anderson

Lawrence Livermore Laboratory, Livermore, California 94550

^*Present address: General Electric Company, Vallecitos Nuclear Center, Sunol, California.

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Phys. Rev. C 9, 973 – Published 1 March, 1974

DOI: https://doi.org/10.1103/PhysRevC.9.973

Abstract

$γ$ decays of levels in ${}^{88}Y$ and ${}^{89}Y$ have been observed with a Ge(Li) spectrometer following 14.1-MeV neutron bombardment of natural yttrium metal. Prompt and delayed (> 50 nsec) radiations were separated by pulsing the neutron source. Following the reaction ${}^{89}Y (n, 2 n) - {}^{88}Y$ , delayed $γ$ rays of 442 and 232 keV are ascribed to the decay sequence $8^{+}$ (674 keV) → $5^{-}$ (232) → $4^{-}$ (0) and a 393-keV $γ$ ray to the transition $1^{+}$ (393) → $4^{-}$ (0). A delayed 909-keV radiation corresponds to the decay of the first excited state of ${}^{89}Y$ . Cross sections were determined with an uncertainty of ± 11% for the delayed radiations and ± 30% for the remainder. A statistical-model calculation for the ${}^{89}Y (n, 2 n) {}^{88}Y$ reaction reproduces the observed cross sections only if the $γ$ branching ratios in ${}^{88}Y$ are taken from experiment, and in particular, the ${(g_{\frac{9}{2}})}^{2}$ multiplet is included.

[NUCLEAR REACTIONS ${}^{89}Y (n, 2 n γ) {}^{88}Y$ , ${}^{89}Y (n, n^{'} γ) {}^{89}Y$ . $E = 14.1$ MeV; measured $E_{γ}$ , $σ (E_{γ})$ . Deduced $σ (E_{γ})$ dependence on $J$ , $π$ in ${}^{88}Y$ . Natural target, Ge(Li) detector.]

References (36)

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[c1] C. D. Goodman, T. A. Hughes, M. W. Johns, and K. Way, Nucl. Data A8, 345 (1970)

[c2] E. K. Hyde, M. G. Florence, and A. E. Larsh, Phys. Rev. 97, 1255 (1955)

[c3] Leipunskii, Morozov, Makarov, and Yampol'skii, Z. Eksp. Teor. Fiz. SSSR 32, 393 (1957) [transl.: Sov. Phys. — JETP 5, 305 (1957)]

[c4] A. M. Morozov and V. V. Remaev, Z. Eksp. Teor. Fiz. SSSR 43, 438 (1962) [transl.: Sov. Phys. — JETP 16, 314 (1963)]

[c5] E. A. Ivanov, Rev. Roum. Phys. 12, 885 (1967)

[c6] J. R. Comfort and J. P. Schiffer, Phys. Rev. C 4, 803 (1971)

[c7] R. C. Bearse et al., Phys. Rev. Lett. 23, 864 (1969)

[c8] H. W. Baer, R. L. Bunting, J. E. Glenn, and J. J. Kraushaar, Nucl. Phys. (to be published)

[c9] F. Gabbard, G. Chenevert, and K. K. Sekharan, Phys. Rev. C 6, 2167 (1972)

[c10] Omitted endnote

[c11] E. Storm and H. Israel, Nucl. Data A7, 565 (1970)

[c12] E. Monnand, Centre d'Etudes Nucleaires de Grenoble Report No. CEA-R2900, 1965 (unpublished)

[c13] G. N. Salaita and P. K. Eapen, Trans. Am. Nucl. Soc. 16, 59 (1973)

[c14] V. L. Glagolev and P. A. Yampol'skii, Z. Eksp. Teor. Fiz. SSSR 40, 743 (1961) [transl.: Sov. Phys. — JETP 13, 520 (1961)]

[c15] L. Van Zelst, P. Meyers, and J. A. Oosting, Physica 39, 463 (1968)

[c16] K. G. Broadhead, D. E. Shanks, and H. H. Heady, Phys. Rev. 139, B1525 (1965)

[c17] P. S. Buchanan, S. C. Mathur, W. E. Tucker, I. L. Morgan, and E. L. Hudspeth, Phys. Rev. 158, 1041 (1967)

[c18] J. B. Marion, Nucl. Data A4, 301 (1968)

[c19] G. C. Dutt and F. Gabbard, Phys. Rev. 178, 1770 (1969)

[c20] W. W. Daehnick and T. S. Bhatia, Phys. Rev. C 7, 2366 (1973)

[c21] E. Vogt, in Advances in Nuclear Physics (Plenum, New York, 1968), Vol. 1, p. 261

[c22] F. Bjorklund and S. Fernbach, Phys. Rev. 109, 1295 (1958)

[c23] S. M. Grimes, private communication

[c24] P. A. Moldauer, Nucl. Phys. 47, 65 (1963)

[c25] J. J. Griffin, Phys. Rev. Lett. 17, 478 (1966)

[c26] J. Károlyi, J. Csikai, and G. Petö, Nucl. Phys. A122, 234 (1968)

[c27] R. Rieder and H. Münzer, Acta Phys. Austr. 23, 42 (1966)

[c28] J. R. Huizenga, in Statistical Properties of Nuclei, edited by J. B. Garg (Plenum, New York, 1972), p. 438

[c29] J. R. Huizenga and R. Vandenbosch, Phys. Rev. 120, 1305 (1960)

[c30] R. Vandenbosch and J. R. Huizenga, Phys. Rev. 120, 1313 (1960)

[c31] M. A. Preston, Physics of the Nucleus (Addison-Wesley, New York, 1962), p. 299

[c32] A. R. Edmonds, Angular Momentum in Quantum Mechanics (Princeton U. P., Princeton, 1957)

[c33] C. M. Lederer, J. M. Hollander, and I. Perlman, Table of Isotopes (Wiley, New York, 1967), 6th ed

[c34] D. H. Wilkinson, in Nuclear Spectroscopy, edited by F. Ajzenberg-Selove, (Academic, New York, 1960), Part B, p. 859

[c35] R. S. Hager and E. C. Seltzer, Nucl. Data A4, 1 (1968)

[c36] C. F. Perdrisat, Rev. Mod. Phys. 38, 41 (1966)

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Gamma production cross sections from 14-MeV neutron bombardment of ${}^{89}Y$

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Gamma production cross sections from 14-MeV neutron bombardment of Y89

Abstract

References (36)

Gamma production cross sections from 14-MeV neutron bombardment of ${}^{89}Y$