Observation of isoscalar multipole strengths in exotic doubly-magic $^{56}$Ni in inelastic α scattering in inverse kinematics

• Published in: Physics letters. B Vol. 751; pp. 371 - 375
• Main Authors: Bagchi, S., Gibelin, J., Harakeh, M.N., Kalantar-Nayestanaki, N., Achouri, N.L., Akimune, H., Bastin, B., Boretzky, K., Bouzomita, H., Caamano, M., Caceres, L., Damoy, S., Delaunay, F., Fernandez-Dominguez, B., Fujiwara, M., Garg, U., Grinyer, G.F., Kamalou, O., Khan, E., Krasznahorkay, A., Lhoutellier, G., Libin, J.F., Lukyanov, S., Mazurek, K., Najafi, M.A., Pancin, J., Penionzhkevich, Y., Perrot, L., Raabe, R., Rigollet, C., Roger, T., Sambi, S., Savajols, H., Senoville, M., Stodel, C., Suen, L., Thomas, J.C., Vandebrouck, M., Walle, J. van De
• Format: Journal Article
• Language: English
• Published: Elsevier 17-12-2015
• Subjects: Nuclear Experiment; Physics
• ISSN: 0370-2693
• DOI: 10.1016/j.physletb.2015.10.060

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.