Systematics of the total strength and the contribution of orbital current for the M1 excitations in the even-even sd-shell nuclei

Status of the Nuclear Shell Model

“…Clearly, something is missing in the calculation. The W interaction pre di cts that this state has a large orbital component at small q (141)(142)(143)(144), and this has been confirmed in a re ce nt (p,p') experiment (142 ).…”

Analogous Gamow-Teller and M1 Transitions in Tz = ±½ Mirror Nuclei and in Tz = ±1, 0 Triplet Nuclei relevant to Low-energy Super GT state

“…In order to remove the constructive and destructive contributions of both IS and orbital terms, it was proposed to sum up the strengths over a wide range of excitation energy [14] and such cancellation of orbital contributions was predicted in shell-model calculations [15]. The analyses performed for the even-even self-conjugate nuclei 24 Mg and 28 Si suggested that the R MEC value is in the range of 1.20 -1.85 [14,16,17].…”