%0 Journal Article %1 ISI:000487165200013 %A Tsoneva, N. %A Spieker, M. %A Lenske, H. %A Zilges, A. %D 2019 %J Nuclear Physics A %K imported myown zilges %P 183-198 %R 10.1016/j.nuclphysa.2019.07.008 %T Fine structure of the pygmy quadrupole resonance in Sn-112,Sn-114 %V 990 %X 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.

@article{ISI:000487165200013, 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.}, added-at = {2019-11-20T10:09:48.000+0100}, author = {Tsoneva, N. and Spieker, M. and Lenske, H. and Zilges, A.}, biburl = {https://www.bibsonomy.org/bibtex/26294a8212e983e6df4db2e90c08f1b5a/ikpcologne}, doi = {10.1016/j.nuclphysa.2019.07.008}, eissn = {1873-1554}, interhash = {563f088fda25230cb1d4488c9f79cc97}, intrahash = {6294a8212e983e6df4db2e90c08f1b5a}, issn = {0375-9474}, journal = {Nuclear Physics A}, keywords = {imported myown zilges}, month = OCT, pages = {183-198}, timestamp = {2019-11-20T10:09:48.000+0100}, title = {Fine structure of the pygmy quadrupole resonance in Sn-112,Sn-114}, unique-id = {ISI:000487165200013}, volume = 990, year = 2019 }