Isospin properties of electric dipole excitations in Ca-48

V. Derya*, D. Savran, J. Endres, M. N. Harakeh, H. Hergert, J. H. Kelley, P. Papakonstantinou, N. Pietralla, V. Yu. Ponomarev, R. Roth, G. Rusev, A. P. Tonchev, W. Tornow, H. J. Wortche, A. Zilges

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

40 Citaten (Scopus)
179 Downloads (Pure)

Samenvatting

Two different experimental approaches were combined to study the electric dipole strength in the doubly-magic nucleus Ca-48 below the neutron threshold. Real-photon scattering experiments using bremsstrahlung up to 9.9 MeV and nearly mono-energetic linearly polarized photons with energies between 6.6 and 9.51 MeV provided strength distribution and parities, and an (alpha, alpha'gamma) experiment at E-alpha = 136 MeV gave cross sections for an isoscalar probe. The unexpected difference observed in the dipole response is compared to calculations using the first-order random-phase approximation and points to an energy-dependent isospiu character. A strong isoscalar state at 7.6 MeV was identified for the first time supporting a recent theoretical prediction. (C) 2014 The Authors. Published by Elsevier B.V.

Originele taal-2English
Pagina's (van-tot)288-292
Aantal pagina's5
TijdschriftPhysics Letters B
Volume730
DOI's
StatusPublished - 7-mrt-2014

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