Nuclear Levels in a Number of Even-Even Rare Earths (<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>150</mn><mi>≤</mi><mi>A</mi><mi>≤</mi><mn>184</mn></math></span>)

B. Harmatz; T. H. Handley; J. W. Mihelich

doi:10.1103/PhysRev.123.1758

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Nuclear Levels in a Number of Even-Even Rare Earths ( $150 \leq A \leq 184$ )

B. Harmatz and T. H. Handley^*

J. W. Mihelich^†,‡

Oak Ridge National Laboratory, Oak Ridge, Tennessee

University of Notre Dame, Notre Dame, Indiana

^*Operated for U. S. Atomic Energy Commission by Union Carbide Corporation.
^†Oak Ridge National Laboratory temporary employee, summer 1957 to 1960.
^‡Work supported in part by U. S. Atomic Energy Commission.

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Phys. Rev. 123, 1758 – Published 1 September, 1961

DOI: https://doi.org/10.1103/PhysRev.123.1758

Abstract

To obtain more data on the system of levels in even-even nuclei, a number of such nuclei ( $150 \leq A \leq 184$ ) were studied with electron-capturing sources in permanent magnet spectrogaphs. Some measurements were made with scintillation counters. Data confirming recently reported results on the decay of ${Tb}^{152}$ , ${Tb}^{156}$ , and ${Ho}^{162}$ have been obtained. It was found that ${Eu}^{150}$ has two isomeric states ( $T_{\frac{1}{2}} = 14$ hr and > 5 yr). Levels at 740.7 (0+) and 773.3 (4+) kev in ${Sm}^{150}$ are proposed. A study of the two isomeric activities of ${Tb}^{154}$ indicated the existence of levels in ${Gd}^{154}$ which may be described as a gamma-vibrational band (at 997.3 kev) and a beta-vibrational band (at 680.6 kev). The new data for ${Tm}^{166}$ (7.7 hr) are consistent with levels in ${Er}^{166}$ at 2137.3 and 2164.6 kev, both of which are probably 3 states and which exhibit considerably different branching ratios of the de-exciting transitions. The decay of ${Lu}^{172}$ appears to populate a large number of even-parity levels in ${Yb}^{172}$ which may be arranged in rotational bands corresponding to primary or base states at 1174.0 kev ( $I = 3 +$ ), 1467.5 kev ( $I = 2 +$ ), 1664.3 kev ( $I = 3 +$ ), 1702.1 kev ( $I = 3 +$ ), 2075.0 kev ( $I = 4 +$ ), and 2287.3 kev ( $I = 4 +$ ). The very complex decay of the two isomers of ${Re}^{182}$ excite many odd-parity levels which may be arranged in seven or more bands. In addition, even-parity beta- and gamma-vibrational bands may be populated. Electron-capture decay of ${Re}^{184}$ populates a gamma-vibrational band in $W^{184}$ of spins 2, 3, and 4. Data relevant to the rotational energy parameters and ratios of gamma-ray transition probabilities from the various states are presented. As a corollary, data on the decay of ${Eu}^{149}$ are presented since this activity was present in some of our composite sources.

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[c1] A. Bohr and B. R. Mottelson, Kgl. Danske Videnskab. Selskab. Mat.-fys. Medd. 27, No. 16 (1953)

[c2] J. J. Griffin and M. Rich, Phys. Rev. 118, 850 (1960)

[c3] S. T. Belyaev, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 31, No. 11 (1959)

[c4] S. G. Nilsson, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 29, No. 16 (1955)

[c5] G. Alaga, K. Alder, A. Bohr, and B. R. Mottelson, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 29, No. 9 (1955)

[c6] I. Marklund, B. Van Nooijen, and Z. Grabowski, Nuclear Phys. 15, 533 (1960)

[c7] R. K. Sheline, Revs. Modern Phys. 32, 1 (1960)

[c8] A. S. Davydov and C. F. Filippov, Nuclear Phys. 8, 237 (1958)

[c9] D. M. Van Patter, Nuclear Phys. 14, 42 (1960)

[c10] A. S. Davydov, N. S. Rabotnov, and A. A. Chaban, Nuclear Phys. 17, 169 (1960)

[c11] C. A. Mallman, Nuclear Phys. 24, 535 (1961)

[c12] B. Harmatz, T. H. Handley, and J. W. Mihelich, Phys. Rev. 114, 1082 (1959)

[c13] Omitted endnote

[c14] Nuclear Data Sheets, compiled by K. Way, F. Everling, G. H. Fuller, N. B. Gove, J. B. Marion, R. Nakasima, and C. L. McGinnis, National Academy of Sciences, National Research Council (U. S. Government Printing Office, Washington, D. C. 1958 to 1961)

[c15] Omitted endnote

[c16] A. Kerman, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 30, No. 15 (1955)

[c17] M. E. Rose, Internal Conversion Coefficients (North-Holland Publishing Company, Amsterdam, 1958)

[c18] C. G. Gallagher, D. Strominger, and J. P. Unik, Phys. Rev. 110, 725 (1958)

[c19] E. Bodenstedt, E. Matthias, H. J. Korner, E. Gerdau, F. Frisius, and D. Hovestadt, Nuclear Phys. 15, 239 (1960)

[c20] K. P. Jacob, J. W. Mihelich, B. Harmatz, and T. H. Handley, Phys. Rev. 117, 1102 (1960)

[c21] C. J. Gallagher and S. A. Moszkowski, Phys. Rev. 111, 1282 (1958)

[c22] B. R. Mottelson and S. G. Nilsson, Kgl. Danske Videnskab. Selskab, Mat.-fys. Medd. 1, No. 8 (1959)

[c23] N. R. Johnson, Bull. Am. Phys. Soc. 6, 73 (1961)

[c24] C. J. Gallagher, J. O. Newton, and V. S. Shirley, Phys. Rev. 113, 1298 (1959)

[c25] C. J. Gallagher and J. O. Rasmussen, Phys. Rev. 112, 1730 (1958)

[c26] J. J. Murray, F. Boehm, P. Marmier, and J. W. DuMond, Phys. Rev. 97, 1007 (1955)

[c27] Omitted endnote

[c28] G. D. Hickman and M. L. Wiedenbeck, Phys. Rev. 118, 1049 (1960)

[c29] Omitted endnote

[c30] A. G. W. Cameron, Atomic Energy of Canada Limited Report AECL-433, 1957 (unpublished)

[c31] J. W. Mihelich, B. Harmatz, and T. H. Handley, Phys. Rev. 108, 989 (1957)

[c32] K. P. Jacob, thesis, University of Notre Dame, 1958 (unpublished)

[c33] R. G. Wilson and M. L. Pool, Phys. Rev. 118, 1067 (1960)

[c34] R. G. Helmer and J. B. Burson, Bull. Am. Phys. Soc. 5, 425 (1960) Argonne National Laboratory Report ANL-6270, 1961 (unpublished)

[c35] R. G. Wilson and M. L. Pool, Phys. Rev. 119, 262 (1960)

[c36] K. Ya. Gromov, B. S. Dzhelepov, and V. N. Pokrovskii, Bull. Acad. Sci. USSR 23, 821 (1959)

[c37] J. C. Walker and D. L. Harris, Phys. Rev. Letters 5, 453 (1960)

[c38] B. Harmatz, T. H. Handley, and J. W. Mihelich, Phys. Rev. 119, 1345 (1960)

[c39] M. Jørgensen, O. B. Nielsen, and O. Skilbreid, Nuclear Phys. 24, 443 (1961)

[c40] S. Ofer, Phys. Rev. 115, 412 (1959)

[c41] P. G. Hansen, O. B. Nielsen, and R. K. Sheline, Nuclear Phys. 12, 389 (1959)

[c42] G. T. Ewan, R. L. Graham, and J. S. Geiger, Bull. Am. Phys. Soc. 5, 21 (1960)

[c43] R. W. Henry, L. T. Dillman, N. B. Gove, and R. A. Becker, Phys. Rev. 113, 1090 (1959)

[c44] J. O. Juliano and F. S. Stephens, Phys. Rev. 108, 341 (1957)

[c45] I. Marklund, O. Nathan, and O. B. Nielsen, Nuclear Phys. 15, 199 (1960)

[c46] K. S. Toth, O. B. Nielsen, and O. Skilbreid, Nuclear Phys. 19, 389 (1960)

[c47] A. C. Basina, Izvest. Akad. Nauk S.S.S.R. Ser. Fiz. 24, 813 (1960)

[c48] V. K. Fischer and E. A. Remler, Bull. Am. Phys. Soc. 3, 63 (1958)

[c49] L. Rosler and C. A. Fenstermacher, Bull. Am. Phys. Soc. 2, 268 (1957)

[c50] C. T. Hibdon and C. O. Muehlhause, Phys. Rev. 88, 943 (1952)

[c51] K. Alder, A. Bohr, T. Huus, B. Mottelson, and A. Winther, Revs. Modern Phys. 28, 432 (1956)

[c52] L. C. Schmid and S. B. Burson, Phys. Rev. 120, 161 (1960)

[c53] C. J. S. Chapman, M. A. Grace, J. M. Gregory, and C. V. Sowter, Proc. Phys. Soc. (London) A259, 377 (1960)

[c54] I. Lindgren, A. Cabezas, R. Marrus, and M. Rubenstein, Bull. Am. Phys. Soc. 5, 504 (1960)

[c55] W. G. Wilson and M. L. Pool, Phys. Rev. 117, 517 (1960)

[c56] H. J. Prask, E. G. Funk, and J. W. Mihelich (to be published)

[c57] C. J. Gallagher, H. L. Nielsen, and O. B. Nielsen, Phys. Rev. 122, 1590 (1961)

[c58] J. W. Knowles, G. Manning, G. A. Bartholomew, and P. J. Campion, Proceedings of the International Conference on Nuclear Structure, Kingston, edited by D. A. Bromley and E. W. Vogt (University of Toronto Press, Toronto, 1960), p. 576

[c59] R. G. Wilson and M. L. Pool, Phys. Rev. 118, 227 (1960)

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Nuclear Levels in a Number of Even-Even Rare Earths ( $150 \leq A \leq 184$ )

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References (59)

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Nuclear Levels in a Number of Even-Even Rare Earths (150≤A≤184)

Abstract

References (59)

Nuclear Levels in a Number of Even-Even Rare Earths ( $150 \leq A \leq 184$ )