The isomeric structure of132Pr

Le résumé fourni par la source

The isomeric structure of the neutron deficient nucleus 132 Pr, located in the rare-earth region of the nuclear chart, has been studied with the 98 Mo( 40 Ar,5pn) 132 Pr reaction at beam energies of 150, 158 and 165 MeV. The experiment was performed at the University of Jyväskylä, Finland where the 40 Ar beam was accelerated onto the target by the K130 cyclotron. The JUROGAM II HPGe detector array was employed in conjunction with the RITU gas-filled recoil separator. The focal-plane chamber housed a multi wire proportional counter and a position-sensitive silicon strip detector used for the implantation and identification of recoiling nuclei. The recoil-isomer tagging technique was used to correlate the delayed decays, measured in the Planar and Clover detectors of the GREAT spectrometer, with the known prompt transitions in 132 Pr. Two new delayed transitions have been observed at energies of 102 and 118 keV. The corresponding X ray peaks are consistent with Pr K α and K β X rays with energies of 35.63 and 40.91 keV, respectively. The half-life of the newly established isomeric state, from which the 102 and 118-keV transitions proceed, has been measured to be 2.5(3) μ s.

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