Identification of the Jπ = 1− state in 218Ra populated via α decay of 222Th
Parr, E., Smith, J. F., Greenlees, P., Smolen, M., Papadakis, P., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herzan, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., McPeake, C., . . . Uusitalo, J. (2016). Identification of the Jπ = 1− state in 218Ra populated via α decay of 222Th. Physical Review C, 94(1), Article 014307. https://doi.org/10.1103/PhysRevC.94.014307
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Physical Review CDate
2016Copyright
© 2016 American Physical Society. Published in this repository with the kind permission of the publisher.
The α decay of 222Th populating the low-lying J π = 3− state, and also a proposed 1− state, in 218Ra has been
observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the
3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole
deformation in the light-actinide nuclei. The relative positions of the J π = 1− and 3− states suggest they are
produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric
octupole-deformed shape.
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