"Bi-modal'' Isoscalar Giant Dipole Strength in ${}^{58}$Ni

Abstract

The strength distribution of the isoscalar giant dipole resonance (ISGDR) in ${}^{58}$Ni has been obtained over the energy range 10.5--49.5 MeV via extreme forward angle scattering (including 0${}^{\circ }$) of 386 MeV $\alpha$ particles. We observe a ``bi-modal'' $E1$ strength distribution for the first time in an A $<$ 90 nucleus. The observed ISGDR strength distribution is in good agreement with the predictions of a recent QRPA calculation.

arXiv comment14 pages, including 5 figures

References in corpus (5)

• On dipole compression modes in nuclei
• Isoscalar dipole mode in relativistic random phase approximation
• Isoscalar Giant Dipole Resonance and Nuclear Matter Incompressibility Coefficient
• Self-consistent description of nuclear compressional modes
• Theoretical understanding of the nuclear incompressibility: where do we stand ?

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• Giant Monopole Resonance in even-A Cd isotopes, the asymmetry term in nuclear incompressibility, and the "softness" of Sn and Cd nuclei
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• Isoscalar Giant Resonance Strengths in ${}^{32}$S and possible excitations of superdeformed and ${}^{28}$Si + $\alpha$ cluster bandheads
• Proton decay from the isoscalar giant dipole resonance in ${}^{58}$Ni
• Direct proton decay of the isoscalar giant dipole resonance in 208Pb
• Excitation of the isoscalar giant monopole resonance using 6Li inelastic scattering
• Dipole resonances and the nuclear Schiff moment