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Backbending in the pear-shaped 223(90)Th nucleus: Evidence of a high-spin octupole to quadrupole shape transition in the actinides

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Maquart, G., Augey, L., Chaix, L., Companis, I., Ducoin, C., Dudouet, J., . . . Uusitalo, J. (2017). Backbending in the pear-shaped 223(90)Th nucleus: Evidence of a high-spin octupole to quadrupole shape transition in the actinides. Physical Review C, 95 (3), 034304. doi:10.1103/PhysRevC.95.034304
Published in
Physical Review C
Authors
Maquart, G. |
Augey, L. |
Chaix, L. |
Companis, I. |
Ducoin, C. |
Dudouet, J. |
Guinet, D. |
Lehaut, G. |
Mancuso, C. |
Redon, N. |
Stézowski, O. |
Vancraeyenest, A. |
Astier, A. |
Azaiez, F. |
Courtin, S. |
Curien, D. |
Deloncle, I. |
Dorvaux, O. |
Duchêne, G. |
Gall, B. |
Grahn, Tuomas |
Greenlees, Paul |
Herzan, Andrej |
Hauschild, K. |
Jakobsson, Ulrika |
Jones, Peter |
Julin, Rauno |
Juutinen, Sakari |
Ketelhut, Steffen |
Leino, Matti |
Lopez-Martens, Araceli |
Nieminen, Päivi |
Petkov, P. |
Peura, Pauli |
Porquet, M.-G. |
Rahkila, Panu |
Rinta-Antila, Sami |
Rousseau, M. |
Ruotsalainen, Panu |
Sandzelius, Mikael |
Sarén, Jan |
Scholey, Catherine |
Sorri, Juha |
Stolze, Sanna |
Uusitalo, Juha
Date
2017
Copyright
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.

 
Relatively neutron-rich thorium isotopes lie at the heart of a nuclear region of nuclei exhibiting octupole correlation effects. The detailed level structure of 223Th has been investigated in measurements of γ radiation following the fusion-evaporation channel of the 208Pb(18O ,3n) 223Th reaction at 85 MeV beam energy. The level structure has been extended up to spin 49/2, and 33 new γ rays have been added using triple-γ coincidence data. The spins and parities of the newly observed states have been confirmed by angular distribution ratios. In addition to the two known yrast bands based on a K = 5/2 configuration, a non-yrast band has been established up to spin 35/2. We interpret this new structure as based on the same configuration as the yrast band in 221Th having dominant K = 1/2 contribution. At the highest spin a backbending occurs around a rotational frequency of ¯hω = 0.23 MeV, very close to the one predicted in 222Th, where a sharp transition to a reflection-symmetric shape is expected. ...
Publisher
American Physical Society
ISSN Search the Publication Forum
2469-9985
Keywords
pear-shaped nuclei thorium octupole correlation
DOI
10.1103/PhysRevC.95.034304
URI

http://urn.fi/URN:NBN:fi:jyu-201704071931

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