Tsoneva, N., Spieker, M., Lenske, H. and Zilges, A. (2019). Fine structure of the pygmy quadrupole resonance in Sn-112,Sn-114. Nucl. Phys. A, 990. S. 183 - 199. AMSTERDAM: ELSEVIER. ISSN 1873-1554
Full text not available from this repository.Abstract
The electric quadrupole response in Sn-112,Sn-114 isotopes is investigated by energy-density functional (EDF) and three-phonon quasiparticle-phonon model (QPM) theory with special emphasis on electric quadrupole excitations located above the first collective 2(+) state and below 5 MeV. Additional quadrupole strength clustering as a sequence of states similar to the recently observed pygmy quadrupole resonance in Sn-124 is found. The spectral distributions and transition densities of these 2(+) states show special features being compatible with oscillations of a neutron skin against the isospin-symmetric nuclear core. Furthermore, two (p, p' gamma) Doppler-shift attenuation (DSA) coincidence experiments were performed at the SONIC@HORUS setup. 2(+) states with excitation energies up to 4.2 MeV were populated in Sn-112,Sn-114. Lifetimes and branching ratios were measured allowing for the determination of E2 transition strengths to the ground state. A stringent comparison of the new data to EDF+QPM theory in Sn-112 and Sn-114 isotopes hints at the occurrence of a low-energy quadrupole mode of unique character which could be interpreted as pygmy quadrupole resonance. (C) 2019 Elsevier B.V. All rights reserved.
| Item Type: | Journal Article | ||||||||||||||||||||
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| URN: | urn:nbn:de:hbz:38-133279 | ||||||||||||||||||||
| DOI: | 10.1016/j.nuclphysa.2019.07.008 | ||||||||||||||||||||
| Journal or Publication Title: | Nucl. Phys. A | ||||||||||||||||||||
| Volume: | 990 | ||||||||||||||||||||
| Page Range: | S. 183 - 199 | ||||||||||||||||||||
| Date: | 2019 | ||||||||||||||||||||
| Publisher: | ELSEVIER | ||||||||||||||||||||
| Place of Publication: | AMSTERDAM | ||||||||||||||||||||
| ISSN: | 1873-1554 | ||||||||||||||||||||
| Language: | English | ||||||||||||||||||||
| Faculty: | Unspecified | ||||||||||||||||||||
| Divisions: | Unspecified | ||||||||||||||||||||
| Subjects: | no entry | ||||||||||||||||||||
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| Refereed: | Yes | ||||||||||||||||||||
| URI: | http://kups.ub.uni-koeln.de/id/eprint/13327 |
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