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

S. Bagchi 1 J. Gibelin 2 M.N. Harakeh 1 N. Kalantar-Nayestanaki 1 N.L. Achouri 2 H. Akimune B. Bastin 3 K. Boretzky H. Bouzomita 3 M. Caamano 4 L. Caceres 3 S. Damoy 3 F. Delaunay 2 B. Fernandez-Domınguez 4 M. Fujiwara U. Garg G.F. Grinyer 3 O. Kamalou 3 E. Khan 5 A. Krasznahorkay 6 G. Lhoutellier 2 J.F. Libin 3 S. Lukyanov 7 K. Mazurek M.A. Najafi J. Pancin 3 Y. Penionzhkevich 7 L. Perrot 5 R. Raabe 8 C. Rigollet 1 T. Roger 3 S. Sambi 8 H. Savajols 3 M. Senoville 2 C. Stodel 3 L. Suen J.C. Thomas 3 M. Vandebrouck 2, 3, 5 J. van De Walle 8
1 KVI-CART, University of Groningen
2 LPCC - Laboratoire de physique corpusculaire de Caen
3 GANIL - Grand Accélérateur National d'Ions Lourds
4 Universidade de Santiago de Compostela
5 IPNO - Institut de Physique Nucléaire d'Orsay
6 Institute of Nuclear Research ( ATOMKI )
7 Flerov Laboratory of Nuclear Reactions
8 IKS - Instituut voor Kern-en Stralingsfysica
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 $^{56}$Ni. 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.
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Physics Letters B, Elsevier, 2015, 751, pp.371-375. 〈10.1016/j.physletb.2015.10.060〉
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S. Bagchi, J. Gibelin, M.N. Harakeh, N. Kalantar-Nayestanaki, N.L. Achouri, et al.. Observation of isoscalar multipole strengths in exotic doubly-magic $^{56}$Ni in inelastic α scattering in inverse kinematics. Physics Letters B, Elsevier, 2015, 751, pp.371-375. 〈10.1016/j.physletb.2015.10.060〉. 〈in2p3-01222563〉

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