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Observation and Empirical Shell-Model Study of New Yrast Excited States in the Nucleus ~(142)Ce

Zhong Liu

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Abstract

Excited states of 142 Ce,populated in deep inelastic reactions of 82 Se projectiles bombarding 139 La target,have been studied to medium spins using in beam gamma spectroscopy techniques. Three new levels have been identified at 2625,2995 and 3834keV,and assigned as 8 +,9 (-) and 11 (-) ,respectively,based on the analysis of the properties of gamma transitions. These new yrast states follow well the level systematics of N =84 isotones. Their structures have been discussed with the help of empirical shell model calculations.

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Excited states of 142 Ce,populated in deep inelastic reactions of 82 Se projectiles bombarding 139 La target,have been studied to medium spins using in beam gamma spectroscopy techniques. Three new levels have been identified at 2625,2995 and 3834keV,and assigned as 8 +,9 (-) and 11 (-) ,respectively,based on the analysis of the properties of gamma transitions. These new yrast states follow well the level systematics of N =84 isotones. Their structures have been discussed with the help of empirical shell model calculations.

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Available abstract

Excited states of 142 Ce,populated in deep inelastic reactions of 82 Se projectiles bombarding 139 La target,have been studied to medium spins using in beam gamma spectroscopy techniques. Three new levels have been identified at 2625,2995 and 3834keV,and assigned as 8 +,9 (-) and 11 (-) ,respectively,based on the analysis of the properties of gamma transitions. These new yrast states follow well the level systematics of N =84 isotones. Their structures have been discussed with the help of empirical shell model calculations.

Key concepts: Yrast, Physics, Excited state, Spins, Atomic physics, Projectile, Spectroscopy, Shell (structure)

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