Collective excitations involving spin and isospin degrees of freedom Hiroyuki Sagawa, Gianluca Colò, Xavier Roca-Maza and Yifei Niu Eur. Phys. J. A, 55 12 (2019) 227 Published online: 02 December 2019 DOI: 10.1140/epja/i2019-12923-y