期刊
PHYSICS LETTERS B
卷 730, 期 -, 页码 288-292出版社
ELSEVIER
DOI: 10.1016/j.physletb.2014.01.050
关键词
Low-lying electric dipole excitations; Ca-48; Isospin character
资金
- DFG [ZI 510/4-2, SFB 634]
- European Commission [RII3-CT-2004-506065]
- Alliance Program of the Helmholtz Association [HA216/EMMI]
- Helmholtz International Center for FAIR (HIC for FAIR)
- U.S. Department of Energy [DE-FG02-97ER41033]
- Rare Isotope Science Project of the Institute for Basic Science
- Ministry of Science, ICT and Future Planning
- National Research Foundation of Korea [2013M7A1A1075766]
- Bonn-Cologne Graduate School of Physics and Astronomy
- Direct For Mathematical & Physical Scien
- Division Of Physics [1306250] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1002478] Funding Source: National Science Foundation
- National Research Foundation of Korea [2013M7A1A1075766] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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