Published in
Elsevier, Physics Letters B, (751), p. 371-375, 2015
DOI: 10.1016/j.physletb.2015.10.060
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Observation of isoscalar multipole strengths in exotic doubly-magic 56 Ni in inelastic α scattering in inverse kinematics
,
J. Gibelin ,
M. N. Harakeh ,
N. Kalantar-Nayestanaki,
N. L. Achouri,
H. Akimune ,
B. Bastin,
K. Boretzky,
H. Bouzomita,
M. Caamaño,
L. Càceres,
S. Damoy,
F. Delaunay,
B. Fernández-Domínguez,
M. Fujiwara
and other authors.
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Abstract
Expérience GANIL/LISE/MAYA ; International audience ; The Isoscalar Giant Monopole Resonance (ISGMR) and the Isoscalar GiantDipole Resonance (ISGDR) compression modes have been studied in thedoubly-magic unstable nucleus $^{56}$Ni. They were measured by inelastic α-particlescattering in inverse kinematics at 50 MeV/u with the MAYA active targetat the GANIL facility. The centroid of the ISGMR has been obtained atEx = 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 dipolemode shows similarity with the prediction from the Hartree-Fock (HF) basedrandom-phase approximation (RPA) [1]. These measurements confirm inelasticα-particle scattering as a suitable probe for exciting the ISGMR and the ISGDRmodes in radioactive isotopes in inverse kinematics.