Development of high efficient gas cell for collecting the r-process nuclei around N=126 and producing the high purity beam of the nuclei

开发高效气室，用于收集 N=126 附近的 r 过程核并产生高纯度核束

• 批准号: 24740180
• 负责人: HIRAYAMA Yoshikazu
• 金额: $ 2.08万
• 依托单位: High Energy Accelerator Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24740180/
• 关键词: 国際情報交換; ベルギー; 元素合成; アルゴンガスセル; レーザー共鳴イオン化; ガスセル

By measuring the half-lives of neutron-rich radioactive nuclei with N=126, it is considered that it is possible to understand the process of nucleosynthesis of heavy elements by a rapid neutron-capture reaction in the cosmos. In order to understand the process, we have developed an argon gas-cell with laser ionization for producing an element- and mass-selected radioactive ion beam. The design of a gas cell was optimized by using a flow simulation. The basic property of the gas cell was investigated from the off-line test using a filament placed in the gas cell and from the on-line test using an accelerated beam at RIKEN facility. We have successfully produced an element- and mass-selected ion beam, whose extraction time of about 200 ms was faster than the gas cell produced so far. Owing to the gas cell, we can measure the half-lives of the radioactive nuclei with N=126 for understanding the element synthesis in the cosmos.

通过测量N=126的富中子放射性核的半衰期，人们认为有可能了解宇宙中通过快速中子俘获反应进行的重元素核合成过程。为了了解这个过程，我们已经开发了一个氩气池与激光电离产生元素和质量选择的放射性离子束。通过流动模拟优化了气室的设计。气室的基本性能进行了研究，从离线测试，使用灯丝放置在气室和从在线测试，使用加速束在RIKEN设施。我们已经成功地产生了元素和质量选择的离子束，其提取时间约为200毫秒，比迄今为止生产的气室快。由于有了气室，我们可以测量N=126的放射性核的半衰期，以了解宇宙中的元素合成。

项目成果

Study of collisions of 136Xe + 198Pt for the KEK isotope separator

• DOI: 10.1016/j.nimb.2013.04.036
• 发表时间: 2013-12
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: Y. Watanabe;Y. Hirayama;N. Imai;H. Ishiyama;S. Jeong;H. Miyatake;E. Clément;A. Navin;M. Rejmund;C. Schmitt;G. Pollarolo;L. Corradi;E. Fioretto;D. Montanari;Sang-Mook Choi;Y. Kim;Jakyoung Song;M. Niikura;D. Suzuki;H. Nishibata;J. Takatsu

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Ionization cross section measurements for autoionizing states of iridium and rhenium

铱和铼自电离态的电离截面测量

• DOI: 10.1088/0953-4075/47/7/075201
• 发表时间: 2014
• 期刊: J. Physics B
• 作者: Hirayama Y.;Mukai M.;Watanabe Y.;Imai N.;Ishiyama H.;Jeong S.-C.;Miyatake H.;Oyaizu M.;Matsuo Y.;Sonoda T.;Wada M
• 通讯作者: Wada M

beta-decay spectroscopy of r-process nuclei with N=126 at Kiss

Kiss 处 N=126 的 r 过程核的 β 衰变谱

• 发表时间: 2013
• 作者: H.Ishiyama;et al;大塚孝治;Y.X. Watanabe;Hirayama Y
• 通讯作者: Hirayama Y

Off-line test of the KISS gas cell

• DOI: 10.1016/j.nimb.2013.06.032
• 发表时间: 2013-12
• 期刊: Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
• 影响因子: 1.3
• 作者: Y. Hirayama;Y. Watanabe;N. Imai;H. Ishiyama;S. Jeong;H. Miyatake;M. Oyaizu;Y. Kim;M. Mukai;Y. Matsuo;T. Sonoda;M. Wada;M. Huyse;Y. Kudryavtsev;P. Duppen