Isomer - nuclear isomer
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A nucleus in an excited state is called an isomer if its gamma decay half-life is longer than about 10 -6 seconds. When there are two or more excited nuclei, the nuclei in these states are called isomers or nuclear isomers, and the transition from such an excited state to the ground state is called an isomer transition or nuclear isomer transition. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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ある励起状態にある原子核で，そのγ崩壊の半減期が約 10-6 秒程度より長い場合，その励起状態にある原子核を異性核という。また，このような励起状態の原子核と基底状態の原子核，あるいはこのような励起状態が2つ以上あるとき，それらの状態にある原子核同士は互いに異性核または核異性体であるといい，このような励起状態から基底状態への転移を異性核転移または核異性体転移という。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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