Soft spin dipole giant resonances in 40Ca
nucl-ex
/ Authors
L. Stuhl, A. Krasznahorkay, M. Csatlos, T. Marketin, E. Litvinova, T. Adachi, A. Algora, J. Daeven, E. Estevez, H. Fujita
and 20 more authors
Y. Fujita, C. Guess, J. Gulyas, K. Hatanaka, K. Hirota, H. J. Ong, D. Ishikawa, H. Matsubara, R. Meharchand, F. Molina, H. Okamura, G. Perdikakis, B. Rubio, C. Scholl, T. Suzuki, G. Susoy, A. Tamii, J. Thies, R. Zegers, J. Zenihiro
/ Abstract
High resolution experimental data has been obtained for the 40,42,44,48Ca(3He,t)Sc charge exchange reaction at 420 MeV beam energy, which favors the spin-isospin excitations. The measured angular distributions were analyzed for each state separately, and the relative spin dipole strength has been extracted for the first time. The low-lying spin-dipole strength distribution in 40Sc shows some interesting periodic gross feature. It resembles to a soft, dumped multi-phonon vibrational band with $\hbarω$= 1.8 MeV, which might be associated to pairing vibrations around $^{40}$Ca.