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

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

2006-01-04

arxiv.org/abs/nucl-ex/0601009v1

Phys.Lett. B637 (2006) 43-47

Physics

Nuclear Physics

Nuclear Experiment

14 pages, including 5 figures

Scientific paper

10.1016/j.physletb.2006.03.034

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.

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