Electromagnetic properties of N=75 isotones: Evidence for triaxiality at low spin

E. S. Paul, R. Ma, C. W. Beausang, S. A. Forbes, D. B. Fossan, J. Gizon, J. R. Hughes, Y. Liang, S. M. Mullins, P. J. Nolan, W. F. Piel, R. J. Poynter, P. H. Regan, R. Wadsworth, N. Xu

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Abstract

Electromagnetic properties of the negative-parity yrast bands of the N=75 isotones ranging from barium to gadolinium (56<or=Z<or=64) are summarized. Experimental E2/M1 multipole mixing ratios for inband Delta I=1 transitions have been extracted up through the first band crossing, allowing the evaluation of B(M1; I to I-1)/B(E2; I to I-1), B(M1; I to I-1)/B(E2; I to I-2) and B(E2; I to I-1)/B(E2; I to I-2) ratios of reduced transition probabilities for both the nu h11/2 and nu h11/2(X)( pi h11/2)2 configurations. The results obtained at low spin provide evidence for triaxial nuclear shapes, while at high spin the data are consistent with axially symmetric shapes.

Original languageEnglish (US)
Article number009
Pages (from-to)605-617
Number of pages13
JournalJournal of Physics G: Nuclear and Particle Physics
Volume17
Issue number5
DOIs
StatePublished - Dec 1 1991

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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Paul, E. S., Ma, R., Beausang, C. W., Forbes, S. A., Fossan, D. B., Gizon, J., Hughes, J. R., Liang, Y., Mullins, S. M., Nolan, P. J., Piel, W. F., Poynter, R. J., Regan, P. H., Wadsworth, R., & Xu, N. (1991). Electromagnetic properties of N=75 isotones: Evidence for triaxiality at low spin. Journal of Physics G: Nuclear and Particle Physics, 17(5), 605-617. [009]. https://doi.org/10.1088/0954-3899/17/5/009