Measurement of the dipole and electric quadrupole strength distributions up to 10 MeV in the doubly magic nuclei Ca-40 and Ca-48

Authors
Hartmann, T Enders, J Mohr, P Vogt, K Volz, S Zilges, A
Citation
T. Hartmann et al., Measurement of the dipole and electric quadrupole strength distributions up to 10 MeV in the doubly magic nuclei Ca-40 and Ca-48, PHYS REV L, 85(2), 2000, pp. 274-277
Citations number
25
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
2
Year of publication
2000
Pages
274 - 277
Database
ISI
SICI code
0031-9007(20000710)85:2<274:MOTDAE>2.0.ZU;2-P
Abstract
The doubly magic nuclei Ca-40 and Ca-48 have been studied in high resolutio n photon scattering experiments. We have derived absolute dipole and quadru pole excitation strengths up to 10 MeV. Evidence was found for a two-phonon quadrupole-octupole state in Ca-48. At higher energies in contl ast to Ca- 40, a concentration of dipole strength is observed in Ca-48 which is discus sed in terms of a pygmy resonance originating fi om the large neutron exces s.