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

Author(s):Show less -

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

• Document type: Journal article
• Source: PHYSICAL REVIEW C; v. 101, n. 6, p. 8-pg., 2020-06-11.

Abstract

Inelastic Li-6 scattering at 100 MeV/u on C-12 and Nb-93 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 degrees < theta(lab). < 2 degrees. 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 Li-6 scattering allowed for precise determination of the E0 strengths in C-12 and Nb-93. It was found that the monopole strength in C-12 exhausts 52 +/- 3(()(stat)(.)) +/- 8((sys.))% of the energy-weighted sum rule (EWSR), which is considerably higher than results from previous alpha-scattering experiments. The monopole strength in Nb-93 exhausts 92 +/- 4(()(stat)(.)) +/- 10((sys.))% of the EWSR, and it is consistent with measurements of nuclei with mass number of A approximate to 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. (AU)

• FAPESP's process: 18/04965-4 - Study of structure and nuclear reactions induced by exotic nuclei using active targets
• Grantee: Juan Carlos Zamora Cardona
• Support Opportunities: Scholarships in Brazil - Post-Doctoral