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Competing single-particle and collective states in the low-energy structure of I-113
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-1996-0805
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2013 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 88, no 5, 054307- p.Article in journal (Refereed) Published
Abstract [en]

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 I-113 have been measured as tau = 28(4) ps and tau = 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 tau = 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 gamma-soft rotor with an associated quadrupole deformation of beta(2) approximate to 0.18. Remarkably similar reduced E1 transition probabilities of 5.5(5) x 10(-4) and 4.9(5) x 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.

Place, publisher, year, edition, pages
2013. Vol. 88, no 5, 054307- p.
Keyword [en]
Lifetime Measurements, Recoil, Transition, Plunger
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-136483DOI: 10.1103/PhysRevC.88.054307ISI: 000326823100002ScopusID: 2-s2.0-84888381174OAI: diva2:677641
Swedish Research Council, 621-2010-3694 621-2010-4723

QC 20131210

Available from: 2013-12-10 Created: 2013-12-05 Last updated: 2013-12-10Bibliographically approved

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Bäck, TorbjörnCederwall, BoDoncel, Maria
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