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論文

EXILL; A High-efficiency, high-resolution setup for $$gamma$$-spectroscopy at an intense cold neutron beam facility

Jentschel, M.*; Blanc, A.*; de France, G.*; K$"o$ster, U.*; Leoni, S.*; Mutti, P.*; Simpson, G.*; Soldner, T.*; Ur, C.*; Urban, W.*; et al.

Journal of Instrumentation (Internet), 12(11), p.P11003_1 - P11003_33, 2017/11

 被引用回数:27 パーセンタイル:86.8(Instruments & Instrumentation)

A highly efficient array of high-purity germanium (HPGe) detectors was developed and operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of $$gamma$$-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10$$^8$$ns$$^{-1}$$cm$$^{-2}$$ at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr$$_{3}$$:(Ce) detectors from the FATIMA collaboration.

口頭

Fission yield measurement using multi-nucleon transfer reactions

廣瀬 健太郎; 西尾 勝久; 田中 翔也*; Leguillon, R.*; 牧井 宏之; 西中 一朗*; Orlandi, R.; 塚田 和明; Smallcombe, J.*; Vermeulen, M. J.*; et al.

no journal, , 

The multi-nucleon transfer reaction is very useful way to populate a multitude of nuclides in a wide excitation energy range. We have developed a measurement system at the JAEA tandem accelerator facility to obtain fission observables such as fission-fragment mass distributions (FFMD), prompt fission neutron multiplicities and so on. By identifying the ejectile, the initial compound nucleus is also identified. At high excitation energies, fission of nuclides produced via neutron emission from the initial compound nucleus also contribute to FFMD. In the present study, effects of the multi-chance fission on FFMDs were successfully separated by a combination of a systematic data set obtained from experiments using $$^{18}$$O beams and actinide targets and a dynamical fission calculation based on the fluctuation-dissipation model.

口頭

$$^{235}$$U(n$$_{th}$$,f)における即発$$gamma$$線スペクトルの測定

牧井 宏之; 西尾 勝久; 廣瀬 健太郎; Orlandi, R.; Leguillon, R.*; 小川 達彦; Soldner, T.*; Hambsch, F.-J.*; Frost, R. J. W.*; Tsekhanovich, I.*; et al.

no journal, , 

仏国ラウエ・ランジュバン研究所にある高中性子束炉からの大強度中性子ビームを用いて$$^{235}$$U熱中性子誘起核分裂に伴い発生する$$gamma$$線をおおよそ20MeVまでのエネルギー領域で測定した。得られた$$gamma$$線スペクトルにはいくつかの局所的な構造が観測された。これらの構造の起源について統計模型計算による考察を行ったので、報告する。

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