Shell evolution for neutron-rich 46–54Ar isotopes in the full and truncated fp neutron model spaces.

The shell evolution of even–even drip line argon isotopes 4 6 – 5 4 Ar has been investigated via the shell model calculations using SDPF-U and SDPF-NR two-body effective interactions in two different shell model spaces π (s d) − ν (f p) and π (s d) − ν (f 7 / 2 p). In this work, the energy of first 2 + , reduced transition probability B (E 2) , excitation energy levels as well as how the proton shells evolve with N have been studied. Excellent agreements were obtained for the first 2 + level along the investigated isotopes within π (s d) − ν (f p) and π (s d) − ν (f 7 / 2 p) model spaces. [ABSTRACT FROM AUTHOR]