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Decay spectroscopy of neutron-rich cadmium around the N = 82 shell closure Bernier, Nikita

Abstract

The neutron-rich cadmium isotopes around the well-known magic numbers at Z=50 and N=82 are prime candidates to study the evolving shell structure observed in exotic nuclei. Additionally, the extra binding energy observed around the nearby doubly-magic ¹³²Sn has direct implications for in astrophysical models, leading to the second r-process abundance peak at A≈130 and the corresponding waiting-point nuclei around N=82. The β-decay of the N=82 isotope ¹³⁰Cd into ¹³⁰In was investigated in 2002, but the information for states of the lighter indium isotope ¹²⁸In is still limited. Detailed beta-gamma-spectroscopy of ¹²⁸,¹³¹,¹³²Cd was accomplished using the GRIFFIN facility at TRIUMF. In ¹²⁸In, 32 new transitions and 11 new states have been observed in addition to the four previously observed excited states. The ¹²⁸Cd half-life has also been remeasured via the time distribution of the strongest gamma-rays in the decay scheme with a higher precision. For the decay of ¹³¹,¹³²Cd, results are compared with the recent EURICA data. These new results are compared with recent shell model and IMSRG calculations, highlighting the necessity to re-investigate even "well-known" decay schemes for missing transitions.

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