PT Journal
AU Fujita, Yea
   Algora, A
   Estevez-Aguado, E
   Molina, F
   Rubio, B
TI Observation of Low- and High-Energy Gamow-Teller Phonon Excitations in Nuclei
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2014
BP 112502
EP 5pp
VL 112
IS 11
DI 10.1103/PhysRevLett.112.112502
LA English
AB Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 "f-shell" nuclei in (He-3, t) charge-exchange reactions. In the Ca-42 -> Sc-42 reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the Fe-54 -> Co-54 reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.
ER