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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Kernphysik / Spektroskopie I

HK 48.5: Vortrag

Freitag, 14. März 2008, 15:15–15:30, 2E

First observation of the 8⁺ seniority isomer decay in ¹³⁰Cd — •l. cáceres^1,2, a. jungclaus², m. górska¹, and m. pfützner³ for the RISING-Stopped Beam Campaign collaboration — ¹Gesellchaft für Schwerionenforschung(GSI), D-64291 Darmstadt, Germany. — ²Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain. — ³IEP, Warsaw University, PL-00681 Warsaw, Poland.

Isomeric state has been identified in ¹³⁰Cd and studied using γ-ray spectroscopy following both the projectile fragmentation of ¹³⁶Xe as well as fission of ²³⁸U beams. The reaction products were separated in the GSI FRagment Separator (FRS) and identified unambiguously by means of Bρ-ΔE-Bρ method. The ions of interest were stopped in a plastic layer at the FRS final focal plane which was surrounded by highly efficient RISING γ-ray array. Four γ transitions associated with the isomeric decay of ¹³⁰Cd were identified. Our results are in disagreement with the former tentative energy assigment for the 2⁺ state. The observed energy spectrum in ¹³⁰Cd formed by the alignment of the two g_9/2 proton holes in the Z=50 closed shell at N=82 will be compared to its analogue at N=50 in ⁹⁸Cd and discussed based on systematic of 2⁺ states in ^126,128Cd. The results and their influence on N=82 shell quenching at Z=48 are iterpreted in the framework of shell model calculations. Comparision of the 8⁺ isomer decay spectra in ¹³⁰Cd, ⁹⁸Cd and ⁷⁸Ni, representing the T=1 (g_9/2)⁻² residual interaction, will be shown.