Collective γ-vibrational bands in 165Ho and 167Er

G. Gervais; D. C. Radford; Y. R. Shimizu; M. Cromaz; J. DeGraaf; T. E. Drake; S. Flibotte; A. Galindo-Uribarri; D. S. Haslip; V. P. Janzen; M. Matsuzaki; S. M. Mullins; J. M. Nieminen; C. E. Svensson; J. C. Waddington; D. Ward; J. N. Wilson

doi:10.1016/S0375-9474(97)81838-6

Collective γ-vibrational bands in ¹⁶⁵Ho and ¹⁶⁷Er

G. Gervais, D. C. Radford, Y. R. Shimizu, M. Cromaz, J. DeGraaf, T. E. Drake, S. Flibotte, A. Galindo-Uribarri, D. S. Haslip, V. P. Janzen, M. Matsuzaki, S. M. Mullins, J. M. Nieminen, C. E. Svensson, J. C. Waddington, D. Ward, J. N. Wilson

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

The nuclear structures of ¹⁶⁵Ho and ¹⁶⁷Er have been investigated by means of Coulomb excitation. These nuclei excited at moderate spins exhibit γ-vibrational bands with K^π = 11^-/2 , 3^-/2 in ¹⁶⁵Ho and K^π = 11⁺/2 in ¹⁶⁷Er. The γ-vibrational bands in ¹⁶⁵Ho are found to be isospectral; having very nearly identical in-band γ-ray energies. Gamma-ray branching ratios are analysed to extract information on collectivity and Coriolis mixing. Experimental results are compared with calculations performed with the Cranked Shell Model + RPA + particle-vibration coupling and by invoking the generalized intensity relations (GIR) in the unified model scheme. Although this model explains many features of the data, puzzling aspects such as identical transition energies for the bands in ¹⁶⁵Ho remain unexplained. The role of the K quantum number in identical bands is discussed.

Original language	English
Pages (from-to)	257-274
Number of pages	18
Journal	Nuclear Physics A
Volume	624
Issue number	2
DOIs	https://doi.org/10.1016/S0375-9474(97)81838-6
State	Published - Oct 6 1997
Externally published	Yes

Funding

This work was partially supportedb y the Natural Sciences and EngineeringR e-search Council of Canada (NSERC), AECL and by the Grant-in-Aid for Scientific Research from the Japan Ministry of Education, Science and Culture (No. 08640383 and 08740209).O ne of the authors (G.G.) acknowledgerse ceiptof a scholarshipfr om Fonds pour la Formationd e Chercheurse t l'Aide ~tl a Recherched u Gouvernemendtu Qu6bec (FCAR).

Funders	Funder number
Japan Ministry of Education, Science and Culture	08740209, 08640383
Natural Sciences and EngineeringR e-search Council of Canada
Atomic Energy of Canada Limited

Keywords

Bi beam E = 5.4 MeV/u
Coulomb excitation, Ho, Er, thick gold-backed target
Deduced level schemes, K = 3/2 , 11/2: γ-vibrational bands
Measured Eγ, Iγ, γ-γ coincidences

Access to Document

10.1016/S0375-9474(97)81838-6

Cite this

Gervais, G., Radford, D. C., Shimizu, Y. R., Cromaz, M., DeGraaf, J., Drake, T. E., Flibotte, S., Galindo-Uribarri, A., Haslip, D. S., Janzen, V. P., Matsuzaki, M., Mullins, S. M., Nieminen, J. M., Svensson, C. E., Waddington, J. C., Ward, D., & Wilson, J. N. (1997). Collective γ-vibrational bands in ¹⁶⁵Ho and ¹⁶⁷Er. Nuclear Physics A, 624(2), 257-274. https://doi.org/10.1016/S0375-9474(97)81838-6

@article{cb77dadeceb749ca890ffb60627a5145,

title = "Collective γ-vibrational bands in 165Ho and 167Er",

abstract = "The nuclear structures of 165Ho and 167Er have been investigated by means of Coulomb excitation. These nuclei excited at moderate spins exhibit γ-vibrational bands with Kπ = 11-/2 , 3-/2 in 165Ho and Kπ = 11+/2 in 167Er. The γ-vibrational bands in 165Ho are found to be isospectral; having very nearly identical in-band γ-ray energies. Gamma-ray branching ratios are analysed to extract information on collectivity and Coriolis mixing. Experimental results are compared with calculations performed with the Cranked Shell Model + RPA + particle-vibration coupling and by invoking the generalized intensity relations (GIR) in the unified model scheme. Although this model explains many features of the data, puzzling aspects such as identical transition energies for the bands in 165Ho remain unexplained. The role of the K quantum number in identical bands is discussed.",

keywords = "Bi beam E = 5.4 MeV/u, Coulomb excitation, Ho, Er, thick gold-backed target, Deduced level schemes, K = 3/2 , 11/2: γ-vibrational bands, Measured Eγ, Iγ, γ-γ coincidences",

author = "G. Gervais and Radford, {D. C.} and Shimizu, {Y. R.} and M. Cromaz and J. DeGraaf and Drake, {T. E.} and S. Flibotte and A. Galindo-Uribarri and Haslip, {D. S.} and Janzen, {V. P.} and M. Matsuzaki and Mullins, {S. M.} and Nieminen, {J. M.} and Svensson, {C. E.} and Waddington, {J. C.} and D. Ward and Wilson, {J. N.}",

year = "1997",

month = oct,

day = "6",

doi = "10.1016/S0375-9474(97)81838-6",

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Gervais, G, Radford, DC, Shimizu, YR, Cromaz, M, DeGraaf, J, Drake, TE, Flibotte, S, Galindo-Uribarri, A, Haslip, DS, Janzen, VP, Matsuzaki, M, Mullins, SM, Nieminen, JM, Svensson, CE, Waddington, JC, Ward, D & Wilson, JN 1997, 'Collective γ-vibrational bands in ¹⁶⁵Ho and ¹⁶⁷Er', Nuclear Physics A, vol. 624, no. 2, pp. 257-274. https://doi.org/10.1016/S0375-9474(97)81838-6

TY - JOUR

T1 - Collective γ-vibrational bands in 165Ho and 167Er

AU - Gervais, G.

AU - Radford, D. C.

AU - Shimizu, Y. R.

AU - Cromaz, M.

AU - DeGraaf, J.

AU - Drake, T. E.

AU - Flibotte, S.

AU - Galindo-Uribarri, A.

AU - Haslip, D. S.

AU - Janzen, V. P.

AU - Matsuzaki, M.

AU - Mullins, S. M.

AU - Nieminen, J. M.

AU - Svensson, C. E.

AU - Waddington, J. C.

AU - Ward, D.

AU - Wilson, J. N.

PY - 1997/10/6

Y1 - 1997/10/6

N2 - The nuclear structures of 165Ho and 167Er have been investigated by means of Coulomb excitation. These nuclei excited at moderate spins exhibit γ-vibrational bands with Kπ = 11-/2 , 3-/2 in 165Ho and Kπ = 11+/2 in 167Er. The γ-vibrational bands in 165Ho are found to be isospectral; having very nearly identical in-band γ-ray energies. Gamma-ray branching ratios are analysed to extract information on collectivity and Coriolis mixing. Experimental results are compared with calculations performed with the Cranked Shell Model + RPA + particle-vibration coupling and by invoking the generalized intensity relations (GIR) in the unified model scheme. Although this model explains many features of the data, puzzling aspects such as identical transition energies for the bands in 165Ho remain unexplained. The role of the K quantum number in identical bands is discussed.

AB - The nuclear structures of 165Ho and 167Er have been investigated by means of Coulomb excitation. These nuclei excited at moderate spins exhibit γ-vibrational bands with Kπ = 11-/2 , 3-/2 in 165Ho and Kπ = 11+/2 in 167Er. The γ-vibrational bands in 165Ho are found to be isospectral; having very nearly identical in-band γ-ray energies. Gamma-ray branching ratios are analysed to extract information on collectivity and Coriolis mixing. Experimental results are compared with calculations performed with the Cranked Shell Model + RPA + particle-vibration coupling and by invoking the generalized intensity relations (GIR) in the unified model scheme. Although this model explains many features of the data, puzzling aspects such as identical transition energies for the bands in 165Ho remain unexplained. The role of the K quantum number in identical bands is discussed.

KW - Bi beam E = 5.4 MeV/u

KW - Coulomb excitation, Ho, Er, thick gold-backed target

KW - Deduced level schemes, K = 3/2 , 11/2: γ-vibrational bands

KW - Measured Eγ, Iγ, γ-γ coincidences

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