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PRECISE MEASUREMENT OF ASTRO-NUCLEAR RECTION USING RECOIL MASS ANALYZER

使用反冲质量分析仪精确测量天体核反射

基本信息

批准号：
08404017
负责人：
SAGARA Kenshi
金额：
$ 22.59万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08404017/
关键词：
Astro-nuclear reaction Helium burning speed Supernovae Recoil mass analyzer Windowless gas target Gas stripper Accel-decal strong focus High-intensity C-beam パルスビーム星の流転

项目摘要

The astro-nuclear reaction of ィイD14ィエD1He+ィイD112ィエD1C->ィイD116ィエD1O+γ at EィイD2cmィエD2 = 300 keV plays a very important role in the supernovae and in the primordial nuclear synthesis. In spite of experimental efforts in the world over 30 years, no precise experimental data have been obtained yet due to the extremely small cross section. In the present study, we have developed new instruments and methods in order to precisely measure the reaction cross section in the range from EィイD2cmィエD2 = 3 MeV to 700 keV.We adopted the inverse kinematics method. The detection of the reaction product ィイD116ィエD1O in this method is more than 100 times more efficient than the γ-ray detection so far adopted in many experiments. To separate ィイD116ィエD1O coming out in forward angle and the ィイD112ィエD1C-beam, we developed a recoil mass separator that is composed of one electric deflector, two magnetic deflectors, four quadrupole magnets, and four auxiliary multipole magnets.We also developed a new blow-in type windowless gas target which was found to have enough gas-confining power and to produce ideal gas distribution. Satisfactory target thickness is obtained by the blow-in gas target together with the gas cooling system.We succeeded in strong-focus beam acceleration by the new accel-decel method using Kyushu University tandem accelerator. In this success, we showed that the large tandem accelerator can be transformed to a small tandem with a little modification. we also succeeded in the development of a large aperture gas stripper. By the two successes, a low-energy beam necessary for the astro-nuclear experiment in creased more than 100 times in intensity. Moreover we have succeeded in the production of the pulse beam to be used for the background reduction.After the above developments, we have started the preliminary experiment for the measurement of the ィイD14ィエD1He+ィイD112ィエD1C->ィイD116ィエD1+γ reaction cross section.

的astro-nuclear反应ィイD14ィエD1He +ィイD112ィエD1C - >ィイD116ィエD1O +γ在EィイD2cmィエD2 = 300 keV起着非常重要的作用在超新星和原始核合成。尽管国际上进行了30多年的实验努力，但由于其截面极小，尚未获得精确的实验数据。在本研究中，我们开发了新的仪器和方法，以精确测量反应截面，范围从3mev到700kev。我们采用逆运动学方法。该方法对反应产物γ γ γ γ的检测效率比目前许多实验采用的γ射线检测效率高100倍以上。为了分离出前角射出的γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。研制了一种新型吹入式无窗瓦斯靶，具有足够的围气能力，瓦斯分布理想。采用吹入气体靶和气体冷却系统，获得了满意的靶厚。我们利用九州大学的串列加速器，采用新的加速-衰减方法，成功地实现了强聚焦光束的加速。在这个成功的实验中，我们证明了大型串联加速器可以在稍加修改的情况下转变为小型串联加速器。我们还成功地开发了一种大孔径气提塔。通过这两次成功，天体核实验所需的低能光束的强度增加了100多倍。此外，我们还成功地生产了用于背景还原的脉冲光束。在此基础上，我们开始了测量γ γ反应截面的初步实验。