Magnetic dipole transitions in ${}^{17}\mathrm{C}$ are investigated by shell model calculations. The important role of the tensor interaction for magnetic dipole transitions in this exotic neutron-rich nucleus is pointed out. The recently observed anomalous quenching of the magnetic dipole transition in $1/2_1^{+}$ $\to 3/2_{\mathrm{g}.\mathrm{s}.}^{+}$ is shown to be well explained by using a modified shell model Hamiltonian that takes full account of the tensor force and monopole corrections in the isospin $T=1$ channel. The predicted quadrupole moment of ${}^{17}\mathrm{C}$ is smaller than the value obtained by conventional shell model Hamiltonians.

• Received 29 July 2008

DOI:https://doi.org/10.1103/PhysRevC.78.061301