Abstract
The Isoscalar Giant Monopole Resonance (ISGMR) and the Isoscalar Giant Dipole Resonance (ISGDR) compression modes have been studied in the doubly-magic unstable nucleus 56Ni. They were measured by inelastic α-particle scattering in inverse kinematics at 50 MeV/u with the MAYA active target at the GANIL facility. The centroid of the ISGMR has been obtained at Ex=19.1±0.5 MeV. Evidence for the low-lying part of the ISGDR has been found at Ex=17.4±0.7 MeV. The strength distribution for the dipole mode shows similarity with the prediction from the Hartree–Fock (HF) based random-phase approximation (RPA) [1]. These measurements confirm inelastic α-particle scattering as a suitable probe for exciting the ISGMR and the ISGDR modes in radioactive isotopes in inverse kinematics.
Highlights
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not
Recent developments in nuclear physics involve the studies of short-lived exotic nuclei
The ISGMR and the ISGDR are of prime interest as their excitation energies are directly related to the incompressibility of a nucleus, K A [2,3]
Summary
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. In this Letter, we present the results of the first measurement of the isoscalar giant resonances in the doubly-magic 56Ni investigated with inelastic α-particle scattering in inverse kinematics using the MAYA active-target detector. Two observables are measured to reconstruct the reaction kinematics: the range and the scattering angle of the recoil particle.
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