Universität zu Köln

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
Creators:	Creators Email ORCID ORCID Put Code Tsoneva, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spieker, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenske, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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
Uncontrolled Keywords:	Keywords Language INTERACTION CROSS-SECTIONS; NEUTRON-SKIN; NUCLEAR-STRUCTURE; STATES; MODES; SHELL; ISOTOPES; STRENGTH; RADII Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13327