Decay of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Sr</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>100</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> and a ‘‘pairing-free’’ <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>K</mi></mrow><mrow><mi>π</mi></mrow></msup></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mo>=</mo><mn>1</mn><mn></mn></mrow><mrow><mo>+</mo></mrow></msup></mrow></math> rotational band in odd-odd <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>100</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>

F. K. Wohn; John C. Hill; J. A. Winger; R. F. Petry; J. D. Goulden; R. L. Gill; A. Piotrowski; H. Mach

doi:10.1103/PhysRevC.36.1118

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Decay of ${}^{100}{Sr}$ and a ‘‘pairing-free’’ $K^{π}$ ${= 1}^{+}$ rotational band in odd-odd ${}^{100}Y$

F. K. Wohn, John C. Hill, and J. A. Winger

R. F. Petry and J. D. Goulden

R. L. Gill, A. Piotrowski, and H. Mach

Ames Laboratory and Iowa State University, Ames, Iowa 50011

University of Oklahoma, Norman, Oklahoma 73019

Brookhaven National Laboratory, Upton, New York 11973

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Phys. Rev. C 36, 1118 – Published 1 September, 1987

DOI: https://doi.org/10.1103/PhysRevC.36.1118

Abstract

The decay of ${}^{100}{Sr}$ (193 ms) to the low-spin ${}^{100}Y$ isomer (735 ms) was studied from mass-separated activity produced in thermal neutron fission of ${}^{235}U$ . γ singles and γ-γ coincidence measurements resulted in the placement of 67 γ transitions in a decay scheme with 26 levels below 2 Mev. The multipolarities of low-energy transitions were determined from internal conversion electron measurements. Logft values were deduced using an absolute γ-ray intensity determination for the A=100 decay chain. The $1^{+}$ levels in ${}^{100}Y$ at 10.70 and 974.61 keV each receive ∼40% of the β feeding from ${}^{100}{Sr}$ . A $K^{π}$ ${= 1}^{+}$ rotational band (with $1^{+}$ , $2^{+}$ , and $3^{+}$ levels at 10.70, 76.15, and 172.03 keV) is proposed which can be characterized as a nearly ‘‘pairing-free’’ band. Other levels in ${}^{100}Y$ are discussed in terms of two-quasiparticle Nilsson orbitals.

References (20)

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J. C. Hill, J. A. Winger, F. K. Wohn, R. F. Petry, J. D. Goulden, R. L. Gill, A. Piotrowski and H. Mach, Phys. Rev. C 33, 1727 (1986).
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L. K. Peker, F. K. Wohn, J. C. Hill and R. F. Petry, Phys. Lett. 169B, 323 (1986).
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P. L. Reeder, R. A. Warner, M. D. Edmiston, R. L. Gill, and A. Piotrowski, in Ref. 1, p. 171.
R. L. Gill and A. Piotrowski, Nucl. Instrum. Methods 234, 213 (1985).
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R. F. Petry, H. Dejbakhsh, J. C. Hill, F. K. Wohn, M. Shmid and R. L. Gill, Phys. Rev. C 31, 621 (1985).
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[c1] Nuclei Off the Line of Stability, Symposium Series No. 324, edited by R. A. Meyer and D. S. Brenner (American Chemical Society, Washington, D.C., 1986). (See especially articles by Henry et al.., Lhersoneau et al.., Wohn et al.., and Kratz et al..)

[c2] J. C. Hill, J. A. Winger, F. K. Wohn, R. F. Petry, J. D. Goulden, R. L. Gill, A. Piotrowski and H. Mach, Phys. Rev. C 33, 1727 (1986).

[c3] F. K. Wohn, J. C. Hill, C. B. Howard, K. Sistemich, R. F. Petry, R. L. Gill, H. Mach and A. Piotrowski, Phys. Rev. C 33, 677 (1986).

[c4] L. K. Peker, F. K. Wohn, J. C. Hill and R. F. Petry, Phys. Lett. 169B, 323 (1986).

[c5] P. Federman and S. Pittel, Phys. Lett. 69B, 385 (1977); ibid. 77B, 29 (1978); Phys. Rev. C 20, 820 (1979).

[c6] B. Pahlmann, M. Graefenstedt, U. Keyser, F. Munnich, B. Pfeiffer and H. Weikard, Z. Phys. A 318, 371 (1986).

[c7] J. Münzel, B. Pfeiffer, U. Stohlker, G. Bewersdorf, H. Wollnik, H. Lawin and E. Monnand, Z. Phys. A 321, 515 (1985).

[c8] J. Münzel, B. Pfeiffer and H. Wollnik, Z. Phys. A 313, 247 (1983).

[c9] P. L. Reeder, R. A. Warner, M. D. Edmiston, R. L. Gill, and A. Piotrowski, in Ref. 1, p. 171.

[c10] R. L. Gill and A. Piotrowski, Nucl. Instrum. Methods 234, 213 (1985).

[c11] F. Rösel, H. M. Fries, K. Adler and H. C. Pauli, At. Data Nucl. Data Tables 21, 91 (1978).

[c12] S. Raman and N. B. Gove, Phys. Rev. C 7, 1995 (1973).

[c13] R. F. Petry, H. Dejbakhsh, J. C. Hill, F. K. Wohn, M. Shmid and R. L. Gill, Phys. Rev. C 31, 621 (1985).

[c14] R. A. Meyer, E. Monnand, J. A. Pinston, F. Schussler, I. Ragnarsson, B. Pfeiffer, H. Lawin, G. Lhersonneau, T. Seo and K. Sistemich, Nucl. Phys. A439, 510 (1985).

[c15] R. A. Meyer, R. W. Hoff, and K. Sistemich, Lawrence Livermore Laboratory Report UCAR 10062-84/1, 1984, pp. 6–98.

[c16] R. A. Meyer, Hyp. Int. 22, 385 (1985).

[c17] F. K. Wohn, J. C. Hill and R. F. Petry, Phys. Rev. C 31, 634 (1985).

[c18] F. K. Wohn, J. C. Hill, R. F. Petry, H. Dejbakhsh, Z. Berant and R. L. Gill, Phys. Rev. Lett. 51, 873 (1983).

[c19] B. Pfeiffer, E. Monnand, J. A. Pinston, J. Münzel, P. Möller, J. Krumlinde, W. Ziegert and K.-L. Kratz, Z. Phys. A 317, 123 (1984).

[c20] C. F. Perdrisat, Rev. Mod. Phys. 38, 41 (1966).

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Decay of ${}^{100}{Sr}$ and a ‘‘pairing-free’’ $K^{π}$ ${= 1}^{+}$ rotational band in odd-odd ${}^{100}Y$

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Decay of Sr100 and a ‘‘pairing-free’’ Kπ=1+ rotational band in odd-odd Y100

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References (20)

Decay of ${}^{100}{Sr}$ and a ‘‘pairing-free’’ $K^{π}$ ${= 1}^{+}$ rotational band in odd-odd ${}^{100}Y$