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:
CreatorsEmailORCIDORCID Put Code
Spieker, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tsoneva, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Derya, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endres, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Savran, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harakeh, M. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harissopulos, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herzberg, R. -D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lagoyannis, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lenske, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pietralla, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Popescu, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scheck, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlueter, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sonnabend, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stoica, V. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wortche, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zilges, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
INELASTIC ALPHA-SCATTERING; DIPOLE RESONANCE; STRENGTH; EXCITATION; STATES; DECAYMultiple languages
Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & FieldsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28751

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