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Nonresonant $$p$$-wave direct capture and interference effect observed in the $$^{16}$$O$$(n,gamma)^{17}$$O reaction

$$^{16}$$O$$(n,gamma)^{17}$$O反応における非共鳴p波直接捕獲と干渉効果

永井 泰樹*; 木下 充隆*; 井頭 政之*; 延原 由利子*; 牧井 宏之   ; 三島 賢二*; 嶋 達志*; Mengoni, A.*

Nagai, Yasuki*; Kinoshita, Mitsutaka*; Igashira, Masayuki*; Nobuhara, Yuriko*; Makii, Hiroyuki; Mishima, Kenji*; Shima, Tatsushi*; Mengoni, A.*

We measured the total capture cross section of the $$^{16}$$O$$(n,gamma)^{17}$$O reaction, as well as partial cross sections leading to the ground ($$J^{pi} = 5/2^{+})$$ and first excited ($$J^{pi} = 1/2^{+})$$ states in $$^{17}$$O. The measurement was carried out at average neutron energies of 157, 349, 398, 427, 468, 498, and 556 keV by using pulsed neutrons produced via the $$^{7}$$Li$$(p,n)^{7}$$Be reaction and a $$gamma$$-ray detection system based on an anti-Compton NaI(Tl) spectrometer. We observed the interference effect between the $$3/2^{-}$$ resonance state at 4554 keV of $$^{17}$$O, corresponding to a neutron energy of 411 keV in the center-of-mass system, and a non-resonant contribution in the capture process. The measured partial cross sections are in good agreement with theoretical calculations obtained taking into account the interference between the $$3/2^{-}$$ resonance and a non-resonant p-wave direct radiative capture contribution. Using the present results, together with our previous measurement, we derived the Maxwellian-averaged capture cross sections (MACS) for thermal energies between kT = 5 and 100 keV, key quantities for ${it s}$ process nucleosynthesis studies in massive stars.

使用言語

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English

掲載資料名

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Physical Review C

巻

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102

号

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4

ページ数

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p.044616_1 - 044616_8

発行年月

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2020/10

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開催年月

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開催都市

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開催国

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キーワード

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no keyword

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/PhysRevC.102.044616

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研究データの公開先DOI

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使用施設

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広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：32.51

分野：Physics, Nuclear

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