Competing single-particle and collective states in the low-energy structure of 113I
Taylor, M., Cullen, D., Procter, M., Bäck, T., Cederwall, B., Doncel, M., Braunroth, T., Dewald, A., Pakarinen, J., Grahn, T., Greenlees, P., Auranen, K., Jakobsson, U., Julin, R., Juutinen, S., Herzan, A., Konki, J., Leino, M., Liotta, R., . . . Xu, F. (2013). Competing single-particle and collective states in the low-energy structure of 113I. Physical Review C, 88(5), Article 054307. https://doi.org/10.1103/PhysRevC.88.054307
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2013Copyright
© 2013 American Physical Society. Published in this repository with the kind permission of the publisher.
To understand the low-energy structure of the neutron deficient iodine isotopes, lifetimes for the low-lying
9/2+ and 11/2+ positive-parity states in 113I have been measured as τ = 28(4) ps and τ = 3.7(7) ps, respectively.
The lifetime for the 11/2− state, which feeds the 9/2+ and 11/2+ states, was remeasured with improved accuracy
as τ = 216(7) ps. The reduced transition probability, B(E2) = 32(5) W.u., for the 9/2+ → 5/2+ transition
agrees with that calculated within the shell model using a Hamiltonian based on the charge-dependent Bonn
nucleon-nucleon interaction. In contrast, the much larger transition probability, B(E2) = 209(39) W.u., measured
for the 11/2+ → 7/2+ transition has been interpreted, with the aid of configuration-constrained total Routhian
surface calculations, as resulting from a slightly γ -soft rotor with an associated quadrupole deformation of
β2 ≈ 0.18. Remarkably similar reduced E1 transition probabilities of 5.5(5) × 10−4 and 4.9(5) × 10−4 W.u.
were deduced for the 11/2− → 9/2+ and 11/2− → 11/2+ transitions, respectively, which feed apparently
dissimilar but competing structures.
...


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