metastable isomer

Noun

(physics) An excited state of an isotope, often having different a spin quantum number (designated with an m)

Japanese Meaning

核種の励起状態で、通常の基底状態とは異なるスピン量子数（しばしば『m』と表記される）を有する準安定状態

The metastable isomer persisted for hours before decaying to the ground state, allowing researchers to study its spin-dependent transition.

その準安定核異性体は基底状態へ崩壊するまで数時間持続し、研究者はそのスピン依存遷移を調べることができた。

Sense（1）

(physics) An excited state of an isotope, often having different a spin quantum number (designated with an m)

metastable isomers

（ plural ）