Isoscalar giant resonances for nuclei with mass between 56 and 60

Abstract

The giant resonance region from 10 MeV < E x < 62 MeV in 56 Fe, 58 Ni, and 60 Ni has been studied with inelastic scattering of 240 MeV α particles at small angles, including 0• . Most of the expected isoscalar E0 and E2 strength has been identified below E x = 40 MeV. Between 56 and 72% of the isoscalar E1 strength has been located in these nuclei. The mass dependence of the giant monopole energy between A = 40 and 90 is compared to relativistic and nonrelativistic calculations for interactions with compressibility of nuclear matter K NM ∼ 211-225 MeV.

Isoscalar giant resonances inCa48

“…A similar result has been seen in a number of other nuclei [38,40,41]. Therefore small changes in assumptions about the continuum will drastically affect the E1 strength obtained for the GR peak, particularly at high excitation energy, leading to large uncertainties in the E1 distribution.…”

“…[38], where the continuum was systematically varied and the data were reanalyzed. The strength distributions obtained from these analyses using different choices of continuum and from those obtained with the continua shown in Fig.…”

Isoscalar response ofNi68toα-particle and deuteron probes

“…frame. The additional resonance around 26 MeV is most probably a combination of L = 0, 1, 3 multipolarities, as already observed in this mass region for stable isotopes [1,30]. Considering the present statistics, it is not relevant to try to extract the individual contributions to this structure.…”

Elastic and inelastic scattering of 240-MeVLi6ions fromCa40<

“…However, in the analysis of refractive α-nucleus scattering [23] and of light heavy-ion scattering [24,25] an imaginary potential with a shape different from the real potential was required to reproduce elastic scattering beyond the rainbow angle. A hybrid model, where the folding model is used to calculate the real potential and a Woods-Saxon (WS) form is used for the imaginary potential has been successfully used to describe α-and heavy-ion scattering data by several authors [12,21,22,[26][27][28][29][30]. A detailed study of the double-folding approach for α-nucleus scattering on targets in different mass regions was made by D. T. Khoa in 2001 [26].…”