Universität zu Köln

Spieker, M., Tsoneva, N., Derya, V., Endres, J., Savran, D., Harakeh, M. N., Harissopulos, S., Herzberg, R. -D., Lagoyannis, A., Lenske, H., Pietralla, N., Popescu, L., Scheck, M., Schlueter, F., Sonnabend, K., Stoica, V. I., Wortche, H. J. and Zilges, A. (2016). The pygmy quadrupole resonance and neutron-skin modes in Sn-124. Phys. Lett. B, 752. S. 102 - 108. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-2445

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Abstract

We present an extensive experimental study of the recently predicted pygmy quadrupole resonance (PQR) in Sn isotopes, where complementary probes were used. In this study, (alpha,alpha 'gamma) and (gamma,gamma ') experiments were performed on Sn-124. In both reactions, J(pi)=2(+) states below an excitation energy of 5 MeV were populated. The E2 strength integrated over the full transition densities could be extracted from the (gamma,gamma ') experiment, while the (alpha, alpha 'gamma) experiment at the chosen kinematics strongly favors the excitation of surface modes because of the strong alpha-particle absorption in the nuclear interior. The excitation of such modes is in accordance with the quadrupole-type oscillation of the neutron skin predicted by a microscopic approach based on self-consistent density functional theory and the quasiparticle-phonon model (QPM). The newly determined gamma-decay branching ratios hint at a non-statistical character of the E2 strength, as it has also been recently pointed out for the case of the pygmy dipole resonance (PDR). This allows us to distinguish between PQR-type and multiphonon excitations and, consequently, supports the recent first experimental indications of a PQR in Sn-124. (C) 2015 The Authors. Published by Elsevier B.V.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Spieker, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tsoneva, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Derya, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endres, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savran, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harakeh, M. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harissopulos, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Herzberg, R. -D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lagoyannis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenske, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietralla, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Popescu, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheck, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlueter, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sonnabend, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stoica, V. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wortche, H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-287510
DOI:	10.1016/j.physletb.2015.11.004
Journal or Publication Title:	Phys. Lett. B
Volume:	752
Page Range:	S. 102 - 108
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1873-2445
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INELASTIC ALPHA-SCATTERING; DIPOLE RESONANCE; STRENGTH; EXCITATION; STATES; DECAY Multiple languages Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28751