Sensitivity of the Isoscalar Giant Dipole Resonance to Optical Potentials

M. E. Sadler, W. E. Sondheim, W. P., Stankus,R. S. Towell,R. E. Tribble, A. M., Vasiliev,J. C. Webb,J. L. Willis, G. R. Young, Phys, P. Amaudruz, W. Anderson, M., Comyn, Yu. Davydov, P. Depommier, J., Doornbos, W. Faszer, C. A. Gagliardi, P. Reen, P. Gumplinger, J. C. Hardy, Hasinoff, R. Helmer, R. Henderson, A., Khruchinsky, P. Kitching, Y. Lachin, J. A. Macdonald, R. Manweiler, T. Mathie, J. R. Musser, P. Nord, A. Olin, R. Openshaw, L. Piilonen, T. Porcelli, R. Poutissou, J. Schaapman, V. Selivanov, G. Sheffer, F. Sobratee, J. Soukup, S. T.D., Stanislaus, G. Stinson, R. Tacik, V. Torokhov, M. A. Vasiliev, J. A. Behr, G. C. Boisvert, P. Bricault, J. Cerny, J. M. D’Auria, Dombsky, V. Iacob, J. R. Leslie, T., Lindner, M. D., Moltz, J. Powell

semanticscholar（2001）

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摘要

Compression mode giant resonances have been measured in many nuclei from C to Pb with inelastic scattering of 240 MeV ∀ particles at small angles. Isoscalar monopole (GMR) distributions have been extracted for 17 nuclei and isoscalar dipole (ISDGR) distributions extracted for 11 nuclei. The isoscalar E1 strength distributions in nuclei with A>90 are found to consist of a broad component at Ex ≈ 75/A MeV containing 15-40% of the total isoscalar E1 strength. The GMR results lead to Knm=215-240 MeV depending on the model used (231+5 MeV if compared to microscopic calculations using the Gogny interaction). The ISGDR energies predicted by these same models are substantially higher in excitation than the high energy component of the experimental results.

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