Reexamination of isoscalar giant resonances in C 12 and Nb 93 through Li 6 scattering

J. C. Zamora, C. Sullivan, R. G.T. Zegers, N. Aoi, L. Batail, D. Bazin, M. Carpenter, J. J. Carroll, I. Deloncle, Y. D. Fang, H. Fujita, U. Garg, G. Gey, C. J. Guess, M. N. Harakeh, T. H. Hoang, E. Hudson, N. Ichige, E. Ideguchi, A. InoueJ. Isaak, C. Iwamoto, C. Kacir, N. Kobayashi, T. Koike, M. Kumar Raju, S. Lipschutz, M. Liu, P. Von Neumann-Cosel, S. Noji, H. J. Ong, S. Péru, J. Pereira, J. Schmitt, A. Tamii, R. Titus, V. Werner, Y. Yamamoto, X. Zhou, S. Zhu

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1 Citation (Scopus)


Inelastic Li6 scattering at 100 MeV/u on C12 and Nb93 has been measured with the high-resolution magnetic spectrometer Grand Raiden. The magnetic-rigidity settings of the spectrometer covered excitation energies from 10 to 40 MeV and scattering angles in the range 0°<θlab.<2°. The isoscalar giant monopole resonance was selectively excited in the present data. Measurements free of instrumental background and the very favorable resonance-to-continuum ratio of Li6 scattering allowed for precise determination of the E0 strengths in C12 and Nb93. It was found that the monopole strength in C12 exhausts 52±3(stat.)±8(sys.)% of the energy-weighted sum rule (EWSR), which is considerably higher than results from previous α-scattering experiments. The monopole strength in Nb93 exhausts 92±4(stat.)±10(sys.)% of the EWSR, and it is consistent with measurements of nuclei with mass number of A≈90. Such comparison indicates that the isoscalar giant monopole resonance distributions in these nuclei are very similar, and no influence due to nuclear structure was observed.

Original languageEnglish
Article number064610
JournalPhysical Review C
Issue number6
Publication statusPublished - 2020 Jun


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