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論文

Effects of the nuclear structure of fission fragments on the high-energy prompt fission $$gamma$$-ray spectrum in $$^{235}$$U($$n_{rm th},f$$)

牧井 宏之; 西尾 勝久; 廣瀬 健太郎; Orlandi, R.; L$'e$guillon, R.; 小川 達彦; Soldner, T.*; K$"o$ster, U.*; Pollitt, A.*; Hambsch, F.-J.*; et al.

Physical Review C, 100(4), p.044610_1 - 044610_7, 2019/10

https://doi.org/10.1103/PhysRevC.100.044610
 被引用回数：10 パーセンタイル：78.79(Physics, Nuclear)

The prompt fission $$gamma$$-ray energy spectrum for cold-neutron induced fission of $$^{235}$$U was measured in the energy range $$E_{rm gamma}$$ = 0.8 - 20,MeV, by gaining a factor of about 10$$^{5}$$ in statistics compared to the measurements performed so far. The spectrum exhibits local bump structures at $$E_{rm gamma}approx$$4,MeV and $$approx$$6,MeV, and also a broad one at $$approx$$15,MeV. In order to understand the origins of these bumps, the $$gamma$$-ray spectra were calculated using a statistical Hauser-Feshbach model, taking into account the de-excitation of all the possible primary fission fragments. It is shown that the bump at $$approx$$4,MeV is created by the transitions between the discrete levels in the fragments around $$^{132}$$Sn, and the bump at $$approx$$6,MeV mostly comes from the complementary light fragments. It is also indicated that a limited number of nuclides, which have high-spin states at low excitation energies, can contribute to the bump structure around $$E_{rm gamma}approx$$15,MeV, induced by the transition feeding into the low-lying high-spin states.

口頭

Measurement of high-energy prompt fission $$gamma$$-ray emission in $$^{235}$$U ($$n_{rm th},f$$)

牧井 宏之; 西尾 勝久; 廣瀬 健太郎; Orlandi, R.; L$'e$guillon, R.*; 小川 達彦; Soldner, T.*; K$"o$ster, U.*; Hambsch, F.-J.*; 河野 俊彦*; et al.

no journal, , 

Prompt fission $$gamma$$-ray spectra (PFGS) are important as they allow us to study the structure and de-excitation process of neutron-rich fission fragments. They are also required for the design of the Gen-IV fast reactors and advanced light-water reactors. For spontaneous fission of $$^{252}$$Cf, $$^{252}$$Cf(sf), prompt fission $$gamma$$ rays were observed up to energies of about $$E_{gamma}=$$20 MeV. For neutron-induced fissions, however, the measured PFGS are limited below $$E_{gamma}$$ = 9$$sim$$10 MeV. In this work we extended the measurement of the PFGS for cold neutron-induced fission of $$^{235}$$U up to $$E_{gamma}sim$$ 20 MeV by gaining a factor of about 10$$^{5}$$ in statistics compared to the measurements performed so far. The measurement was carried out at the PF1B cold-neutron facility of the ILL, Grenoble, France. The spectrum exhibits local bump structures at $$E_{gamma}sim$$ 4 MeV and $$sim$$ 6 MeV and also a broad one at $$sim$$ 15 MeV. In this contribution, we will discuss the origins of the bump structures in comparison with the statistical Hauser-Feshbach model calculation.

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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