Single- and Double-Octupole Excitations in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Gd</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>148</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

S. Lunardi; P. Kleinheinz; M. Piiparinen; M. Ogawa; M. Lach; J. Blomqvist

doi:10.1103/PhysRevLett.53.1531

Single- and Double-Octupole Excitations in ${}^{148}{Gd}$

S. Lunardi, P. Kleinheinz, M. Piiparinen, M. Ogawa, M. Lach, and J. Blomqvist

Phys. Rev. Lett. 53, 1531 – Published 15 October 1984

Abstract

In the two-valence-neutron nucleus ${}^{148}{Gd}$ , in-beam ${}^{148}{Sm} (α, 4 n)$ and ( ${}^{3}{He}$ , $3 n$ ) measurements have identified nine $ν^{2} \times octupole$ levels with $3 < I < 14$ . The measured half-life of the ${(ν f_{\frac{7}{2}}^{2} \times 3^{-})}_{9^{-}}$ state gives $B (E 3, 9^{-} \to 6^{+}) = 55 (6) B_{W}$ . A high-lying $12^{+}$ level, which decays by $E 3$ to the $9^{-}$ state, as well as a $14^{+}$ level are shown to be two-phonon octupole excitations of stretched $ν^{2} \times 3^{-} \times 3^{-}$ character. All these results can be quantitatively derived from the experimental data for the coupling of one neutron to the core octupole observed in ${}^{147}{Gd}$ .

Received 2 April 1984

DOI:https://doi.org/10.1103/PhysRevLett.53.1531

Authors & Affiliations

S. Lunardi^*, P. Kleinheinz, M. Piiparinen^†, M. Ogawa^‡, and M. Lach^§

Institut für Kernphysik, Kernforschungsanlage Jülich, D-5170 Jülich, Federal Republic of Germany

J. Blomqvist

Research Institute of Physics, S-10405 Stockholm 50, Sweden

^*Permanent address: Department of Physics, University of Padova, Padova, Italy.
^†Permanent address: Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
^‡Permanent address: Tokyo Institute of Technology, Tokyo, Japan.
^§On leave from Institute of Nuclear Physics, Cracow, Poland.