Proposal of measurements of M1 strengths in giant dipole resonance energy region

巨偶极子共振能区M1强度测量的建议

• 批准号: 25610061
• 负责人: HAYAKAWA Takehito
• 金额: $ 2.41万
• 依托单位: Japan Atomic Energy Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2013
• 资助国家: 日本
• 起止时间: 2013-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-25610061/
• 关键词: レーザーコンプトン散乱γ線; 中性子; 直線偏向γ線; 光核反応; 飛行時間測定法; (γ、n)反応

The M1 transitions in nuclei have attracted increasing attention in nuclear physics and nuclear astrophysics. In 1957, Agodi predicted that the neutron angular distribution in (gamma, n) reactions with a 100% linearly polarized gamma-ray beam for dipole excitation should be anisotropic and universally described by the simple function of a + b cos(phi) at polar angle of 90 degree, where phi is the azimuthal angle. However, this prediction has not been experimentally confirmed over half a century. We have verified experimentally this angular distribution in the (gamma, n) reaction for Au-197, I-127, natural Cu, Fe-56 targets using linearly polarized laser Compton scattering gamma-rays at NewSUBARU in SPrioing-8. Neutron angular distributions were measured by changing the angle of linear polarization plane of the incident laser. The neutron angular distributions are well described as the function predicted by Agodi.

原子核中的 M1 跃迁引起了核物理学和核天体物理学越来越多的关注。 1957 年，Agodi 预测，用 100% 线偏振伽马射线束进行偶极子激发的 (gamma, n) 反应中的中子角分布应该是各向异性的，并且普遍由极坐标下的 a + b cos(phi) 的简单函数来描述90 度角，其中 phi 是方位角。然而，半个多世纪以来，这一预测尚未得到实验证实。我们在 SPrioing-8 的 NewSUBARU 上使用线偏振激光康普顿散射伽马射线，通过实验验证了 Au-197、I-127、天然 Cu、Fe-56 靶材的 (gamma, n) 反应中的角分布。通过改变入射激光的线偏振面的角度来测量中子角分布。中子角分布可以很好地描述为 Agodi 预测的函数。

项目成果

New Probe of M1 and E1 strengths in GDR regions

对东德地区 M1 和 E1 实力的新探索

• 发表时间: 2014
• 期刊: Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxy
• 作者: T. Hayakawa;K. Ogata;S. Miyamoto;T. Mochizuki;K. Horikawa;S. Amano;K. Imazaki;D. Lie;Y. Izawa;S. Chiba
• 通讯作者: S. Chiba

56Feの光核反応の中性子角度分布

56Fe光核反应的中子角分布

• 发表时间: 2014
• 作者: 早川岳人;静間俊行;C. Angell;秋宗秀俊;宮本修治;天野壮;望月 孝晏;千葉敏;緒方一介;藤原守
• 通讯作者: 藤原守

Photodisintegration reactions with linear polarized gamma-ray beam

线性偏振伽马射线束的光崩解反应

• 发表时间: 2014
• 期刊: Proceedings of the international symposium "Nuclear Physics and Gamma-ray sources for Nuclear Security and Nonproliferation
• 作者: T. Hayakawa;S. Miyamoto;K. Horikawa;S. Amano;T. Mochizuki;K. Imazaki;D. Li;Y. Izawa;K. Ogata;S. Chiba
• 通讯作者: S. Chiba