The reaction 58Ni(28Si,2nγ) at 90 MeV incident energy has been used to populate the N=Z nucleus 84Mo. The GASP array was used together with the ISIS Silicon ball, which allowed a subtraction of the charged particle channels in the γ-γ coincidences. The only known transition 21+→01+ of 443.8 keV in 84Mo has been found in coincidence with a γ ray of 673.5±0.4 keV which was assigned as the second (41+→21+) yrast transition. The behavior of the resulting yrast line indicates that 84Mo is a transitional nucleus. The correlation between the excitation energies of the 21+ and 41+ levels of the N=Z nuclei reveals a systematic deviation from the average behavior defined by all collective even-even nuclei.
Evolution of collectivity along the N=Z line: The 84Mo nucleus
LUNARDI, SANTO;BRANDOLINI, FRANCO;LENZI, SILVIA MONICA;VENTURELLI, ROBERTO
1997
Abstract
The reaction 58Ni(28Si,2nγ) at 90 MeV incident energy has been used to populate the N=Z nucleus 84Mo. The GASP array was used together with the ISIS Silicon ball, which allowed a subtraction of the charged particle channels in the γ-γ coincidences. The only known transition 21+→01+ of 443.8 keV in 84Mo has been found in coincidence with a γ ray of 673.5±0.4 keV which was assigned as the second (41+→21+) yrast transition. The behavior of the resulting yrast line indicates that 84Mo is a transitional nucleus. The correlation between the excitation energies of the 21+ and 41+ levels of the N=Z nuclei reveals a systematic deviation from the average behavior defined by all collective even-even nuclei.
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