Beta Decay Half Lives Of Neutron Rich Cu And Ni Isotopes Produced By Thermal Fission Of 235u And 239pu

Author : Mohammad Faleh M. Al-Shudifat
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (13 download)

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Download or read book Beta Decay of Neutron-rich Isotopes of Zinc and Gallium written by Mohammad Faleh M. Al-Shudifat and published by . This book was released on 2015 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beta-decays of neutron-rich nuclei near the doubly magic 78Ni [78Ni] were studied at the Holield Radioactive Ion Beam Facility. The half-life and the gamma-gamma coincidence spectra were used to study the nuclear structure. A new 82,83Zn [82Zn, 83Zn] decay-scheme was built, where a 71±7% beta-delayed neutron branching ratio was assigned in 82Zn [82Zn] decay. New gamma-ray lines and energy levels observed in 82,83Ga [82Ga, 83Ga] beta-decay were used to update previously reported decayschemes. The experimental results were compared to shell model calculations, which postulate the existence of Gamow-Teller transitions in these decays. The half-lives of 155±17 and 122±28 ms were determined for 82,83Zn, respectively. In order to enable future studies of very neutron rich isotopes a new detector was developed as a second project. This detector is intended for use in fragmentation type experiments, which require segmentation in order to enable implantation-decay correlations. In addition, the detector requires good timing resolution for neutron time-of-ight experiments. A Position Sensitive Photo-Multiplier Tube (PSPMT) from Hamamatsu coupled with a 16x16 fast pixelated plastic scintillator was used. The PSPMT's anodes form 8x8 segment panel used for position reconstruction. Position localization has been achieved for energies range of 0.5-5 MeV. A single signal dynode (DY12) shows a sufficient time resolution between this signal and the anode's signals, which enable us to used DY12 signal alone as a trigger for timing purposes. The detector's DY12 signals was tested with reference detectors and it provided a sub-nanosecond time resolution through the use of a pulse-shape analysis algorithm, which is sufficient for use in experiments with the requirement for the fast timing. The detector ability to survive after implanting high-energy ions was tested using a laser that simulated energy of 1 GeV. The recovery time of the detector in this situation was 200 nanosecond.