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Journal Articles

Octupole collectivity in $$^{94}$$Zr

Toh, Yosuke; Oshima, Masumi; Koizumi, Mitsuo; Osa, Akihiko; Kimura, Atsushi; Sugawara, Masahiko*; Goto, Jun*

AIP Conference Proceedings 1090, p.189 - 193, 2009/02

https://doi.org/10.1063/1.3087011

no abstracts in English

Journal Articles

Multi-step cascades in $$^{63}$$Ni

Oshima, Masumi; Kin, Tadahiro; Kimura, Atsushi; Furutaka, Kazuyoshi; Toh, Yosuke; Koizumi, Mitsuo

AIP Conference Proceedings 1090, p.386 - 390, 2009/01

https://doi.org/10.1063/1.3087051

Multi-step cascades from the $$^{62}$$Ni(n$$_{cold}, gamma)^{63}Ni$$ reaction were studied via a $$gamma$$-ray spectroscopy method. A $$gamma$$-ray detector array comprising eight Eurisys clover detectors and BGO anti Compton shields has been constructed at the research reactor, JRR-3, in Japan Atomic Energy Agency, which is used to accumulate multiple $$gamma$$-ray coincident events. By selecting full cascade events from the capture state to the ground state, we have developed a new level construction method called Total Energy Leading nuclear Level Analysis in 1-dimensional spectrum (TELLA-1). Statistical pattern of multi-step cascades enables us to derive reliable decay scheme up to the capture state at 6,838 keV. In the presentation we will describe its principle and validity in the nuclear level assignment in $$^{63}Ni$$.

Oral presentation

Identification of nuclear levels of $$^{34}$$S for determination of the neutron capture cross section

Kin, Tadahiro; Oshima, Masumi; Furutaka, Kazuyoshi; Koizumi, Mitsuo; Toh, Yosuke; Kimura, Atsushi

no journal, , 

Summing partial cross sections of all $$gamma$$ rays emitted in transitions from excited states to a ground-state (ground-state transitions) is considered to be an effective method for measurements of thermal neutron capture cross sections. To apply this method, all ground-state transitions have to be known. However, information of ground-state transitions is insufficient in many cases. We are, therefore, constructing a spectrometer to improve data of identified ground-state transitions. We have been developing a method to analyze data which can find candidates of nuclear levels without complicated human manipulations with short analysis time. It is called "TELLA-2 (Total Energy Leading nuclear Level Analysis in 2-dimensional matrix)". To modify the method, we measured prompt $$gamma$$-ray from $$^{33}$$S(n,$$gamma$$)$$^{34}$$S and found possible unknown nuclear levels of $$^{34}$$S with the spectrometer.

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