Study of the photonuclear reactions of p-nuclides by means of inorganic scintillation targets

利用无机闪烁靶研究p核素的光核反应

• 批准号: 23540342
• 负责人: SHIMA Tatsushi
• 金额: $ 3.49万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540342/
• 关键词: p-過程; モリブデン92; 能動標的; 無機シンチレータ; 光核反応; 放射化法; 元素合成過程; モリブデン; レーザー逆コンプトンガンマ線; NaI(Tl)シンチレーション検出器

92Mo is the most neutron-deficient nuclide in molybdenum isotopes, and is supposed to be produced via the p-process of the astrophysical nucleosynthesis. It has been a long-standing problem in nuclear astrophysics that the observed abundance of 92Mo is smaller by a factor of a few ten than the predicted value of the p-process theory. One of the possible reason for this discrepancy is the inaccuracy of the 92Mo(gamma,p)91Nb reaction cross section which has not been measured experimentally. We developed a new method for measurement of the 92Mo(gamma,p)91Nb cross section by using an inorganic scintillator including molybdenum as an active target. A high-sensitivity photo-activation analysis was also developed, and was successfully used for measurement of the 92Mo(gamma,p)91Nb reaction cross section using a quasi-monoenergetic laser Compton-scattered gamma-ray beam provided at the NewSUBARU synchrotron radiation facility of the University of Hyogo.

92 Mo是钼同位素中最缺中子的核素，被认为是通过天体物理核合成的p-过程产生的。在核天体物理学中，92 Mo的观测丰度比p过程理论的预测值小几十倍，这是一个长期存在的问题。这种差异的一个可能的原因是92 Mo（γ，p）91 Nb反应截面的不准确性，这还没有通过实验测量。我们开发了一种使用包含钼的无机闪烁体作为活性靶来测量92 Mo（gamma，p）91 Nb横截面的新方法。高灵敏度的光活化分析也被开发出来，并成功地用于测量92 Mo（伽马，p）91 Nb反应截面使用准单能激光康普顿散射伽马射线束提供的新SUBARU同步辐射设施的兵库大学。

项目成果

Neutrino nuclear reactions by photon and lepton probes

光子和轻子探测器的中微子核反应

• 发表时间: 2012
• 作者: N. Nishimori;R. Nagai;S. Matsuba;R. Hajima;M. Yamamoto;Y. Honda;T. Miyajima;H. Iijima;M. Kuriki;M. Kuwahara;Tatsushi Shima
• 通讯作者: Tatsushi Shima

Energy Calibration of Electron and Gamma-ray Beams at NewSUBARU-GACKO

NewSUBARU-GACKO 的电子束和伽马射线束能量校准

• 发表时间: 2014
• 作者: 阿蘇司;高瀬亘,渡瀬芳之,岩井剛,佐々木節;長野邦浩;T. Shima
• 通讯作者: T. Shima

NewSUBARU・ガンマ線源とその利用

NewSUBARU・伽马射线源及其用途

• 发表时间: 2013
• 作者: 西森信行;永井良治;松葉俊哉;羽島良一;山本将博;宮島司;本田洋介;内山隆司;飯島北斗;栗木雅夫;桑原真人;嶋達志
• 通讯作者: 嶋達志

Nuclear Astrophysics with Laser Compton-backscattered ・-rays

激光康普顿背散射射线的核天体物理学

• 发表时间: 2012
• 作者: 西森信行;永井良治;松葉俊哉;羽島良一;山本将博;本田洋介;宮島司;飯島北斗;栗木雅夫;桑原真人;奥見正治;中西彊;T. Shima
• 通讯作者: T. Shima

高輝度ガンマ線による基礎物理研究

使用高强度伽马射线的基础物理研究

• 发表时间: 2013
• 作者: N. Nishimori;R. Nagai;S. Matsuba;R. Hajima, M. Yamamoto;Y. Honda;T. Miyajima;T. Uchiyama;M. Kuriki;嶋達志
• 通讯作者: 嶋達志