Excitations of Isovector Monopole Resonance in Nuclei

原子核中等矢量单极子共振的激发

• 批准号: 07640426
• 负责人: TANAKA Masayoshi
• 金额: $ 1.47万
• 依托单位: Kobe Tokiwa Jr. College
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640426/
• 关键词: Isovector Monopole; Giant Dipole Resonance; Spin Dipole Resonance; One particle one hole; Statistical model; Neutron decay; GSO counter; Grand Raiden; 1粒子1孔; 集団励起モード; アイソスカラー; アイソベクター; 巨大共鳴; 準弾性散乱; 圧縮運動; 星の進化

We searched for the Isovector giant resonance by means of a tripple coincidence method among decay neutrons, 430 keV gamma-rays from the first excited state of ^7Be and scattered ^7Be following the (^7Li, ^7Be) reaction on ^<12>C using a 65 AMev ^7Li beam from a Ring cyclotron at RCNP.Osaka University. For detection of 7Be scattered at 0 degrees the magnetic spectrograph, "Grand-Raiden" was used. For detection of 430 keV gamma-rays and decay neutrons a GS0-counter array composed of 22 counter segments and liquid neutron counter arrays composed of 48 segments were used. It was found that we could succeeded in observing neutron decays from the isovector non spin-flip (DELTAS=0) states separately from the isovector spin-flip (DELTAS=1) states for the first time. This will hopefully provide a delightfull direction toward the discovery of the Isovector Giant Monopole Resonance.

我们通过衰减中子中的tripple重合方法，在 ^7be的第一个兴奋状态和分散的 ^7be中搜索了等值巨人的共鸣，430 kev gamma-rays（ ^7li， ^7be）在 ^<12> c上使用65 Amev ^7li beam the ^<12> C上的反应（ ^7li， ^7be）。为了检测7BE在0度散射的磁光谱仪，使用了“ Grand Raiden”。为了检测430个kev伽马射线和衰减中子，使用了由22个计数器段组成的GS0-counter阵列，并使用了由48个段组成的液体中子柜台阵列。发现我们可以首次从等异位杆（deltas = 0）状态从异载体旋转窗口（deltas = 1）状态分开观察中子衰变。希望这将为发现等值器巨头单极共振的愉悦方向提供一个令人愉悦的方向。

项目成果

中山信太郎他: "The (^7Li,^7Be) reaction as a Spin-Probe for Isovector Excitations" Nuclear Instruments & Methods, Elsevier Science. (印刷中).

Shintaro Nakayama 等人：“(^7Li,^7Be) 反应作为等矢量激发的自旋探针”核仪器与方法，Elsevier Science（出版中）。

S.Nakayama, K.Fushimi, H.Kohri, H.Akimune, I.Daito, H.Fujimura, Y.Fujita, M.Fujiwara, T.Inomata, K.Ishibashi, T.Iwawaki, N.Koori, K.Takahisa, A.Tamii, M.Tanaka, H.Toyokawa, and T.Yamagata: ""GSO-detector system, 'NYMPHS' for (^7Li, ^7Be-gamma) Reaction at

S.Nakayama、K.Fushimi、H.Kohri、H.Akimune、I.Daito、H.Fujimura、Y.Fujita、M.Fujiwara、T.Inomata、K.Ishibashi、T.Iwawaki、N.Koori、K.

S.Nakayama, K.Fushimi, H.Kohri, H.Akimune, I.Daito, H.Fujimura, Y.Fujita, M.Fujiwara, T.Inomata, K.Ishibashi, T.Iwawaki, N.Koori, K.Takahisa, A.Tamii, M.Tanaka, H.Toyokawa, and T.Yamagata: ""The (^7Li, ^7Be-gamma) Reaction as a Spin-Probe for Isovector Ex

S.Nakayama、K.Fushimi、H.Kohri、H.Akimune、I.Daito、H.Fujimura、Y.Fujita、M.Fujiwara、T.Inomata、K.Ishibashi、T.Iwawaki、N.Koori、K.