Speaker
Ryo Taniuchi
(Department of Physics, Graduate School of Science, The University of Tokyo)
Description
Since 78Ni is the most neutron rich doubly-magic-nuclei humankind can reach, the information of the shell structure of 78Ni is an important clue to examine the "shell evolution". The experiment named as "Shell Evolution And Search for Two-plus energies At RIBF" (SEASTAR) was done in May 2014 to obtain the informaition of the excited states of 78Ni.
In this experiment, the nuclides of 79Cu were produced by BigRIPS separator and bombarded with a thick liquid hydrogen target named as MINOS. Dexcited gamma-rays were measured by DALI2 detector array, which consist of around 200 NaI(Tl) scintillators surrounding MINOS. After the reaction at MINOS, one-proton knockout reaction was identified by tagging 78Ni with ZeroDegree spectrometer placed at the downstream of the target.
Because the measurement run for 78Ni was lasted almost 6days, fluctuations of gains of all detectors should be checked. The gain of DALI2 gamma-ray detector was shifted depending on time, because it was perhaps activated by high-rate beam. In this presentation, as the current status of analysis for the excited state of 78Ni, the gain shift of DALI2 detector will be shown and discussed.
Primary author
Ryo Taniuchi
(Department of Physics, Graduate School of Science, The University of Tokyo)
