Shell model and octupole states in148Gd from in-beam experiments |
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Authors: | M Piiparinen P Kleinheinz S Lunardi M Ogawa G de Angelis F Soramel W Meczynski J Blomqvist |
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Institution: | 1. Institut für Kernphysik, Forschungszentrum Jülich, Postfach 1913, W-5170, Jülich 1, Germany 2. Department of Physics, University of Jyv?skyl?, Seminaarinkatu 15, SF-40100, Jyv?skyl?, Finland 3. Department of Physics and INFN, Via F. Marzolo, 8, I-35131, Padova, Italy 4. Manne Siegbahninstitutet, Raslagsv?gen 100, S-10405, Stockholm 50, Sweden
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Abstract: | Through (α, 4n) and (τ, 3n) reactions the high-spin states in the two-neutron nucleus148Gd were populated up toI π=21? at 7.2 MeV, including numerous states above the yrast line. The148Gd energy spectrum is interpreted in terms of the spherical shell model. Identification of the (νf 7/2 i 1 3/2)10? state gives the νi 13/2 single particle energy free of octupole admixtures as 2.1(1) MeV. Eight high-spin states between 1.2 and 3.7 MeV were identified as the couplings of the two valence-particles to the146Gd octupole phonon, and three above-lying levels are assigned as double-octupole excitations including a 12+ state which decays by anE3-E3 stretched cascade. All these octupole levels can be quantitatively predicted from the one-particle x phonon spectrum of147Gd. The high-spin states above 3 MeV are four-quasiparticle excitations ofπ +1 π ?1 ν 2 andπ 2 ν 2 type and their energies are in good accord with shell model estimates. |
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