"SEARCH FOR NEW NEUTRON RICH NUCLEI BY USING ALLENE-DOPED-LIQUlD ARGON CALORIMETER"

“使用丙二烯掺杂液氩热量计寻找新的富中子核”

• 批准号: 06640413
• 负责人: DOKE Tadayoshi
• 金额: $ 1.34万
• 依托单位: WASEDA UUIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06640413/
• 关键词: fragment nuclei,; ^<58>Ni,; Allene-doped-liquid Ar calorimeter,; production cross-section; 液体アルゴン; カロリメータ; 同位元素弁別能; 中性子過剰核; 希土類元素; 同位元素弁別

A new type liquid argon homogeneous calorimeter has been constructed for identification of high energy heavy particles. In the calorimeter, liquid argon doped with a small amount of allene is used as detector medium and the electrode system consists of many thin parallel plates. In the early stage, the possibility of isotope identification near rare earth elements was expected by using ionization signals from the electrode system but we could not succeed in identifying the isotopes. Now, we are investigating the reason why the expected energy or mass resolution was not obtained. Using the same method, however, we could identify individual elements near Ni and successfully obtain the cross-sections of fragment nuclei produced by incident ^<58>Ni ions of 650 MeV/n in liquid argon. They were obtained as a function of the range of Ni particle, or, as a function of the energy of Ni particle over the energy range from 300 MeV/n to 600 MeV/n. Thus obtained total cross sections are in good agreement with ones estimated by Townsend and Wilson Model.

本文介绍了一种用于高能重粒子鉴别的新型液氩均匀量热计。量热计采用掺有少量丙二烯的液氩作为检测介质，电极系统由许多平行薄板组成。在早期阶段，人们期望通过电极系统的电离信号来识别稀土元素附近的同位素，但我们未能成功地识别同位素。现在，我们正在调查为什么没有获得预期的能量或质量分辨率的原因。然而，使用同样的方法，我们可以识别Ni附近的单个元素，并成功地获得了650 MeV/n的Ni离子入射到液态氩中产生的碎片核的截面。<58>它们作为Ni粒子射程的函数，或者作为Ni粒子能量的函数，在能量范围从300 MeV/n到600 MeV/n。计算结果与用汤森和威尔逊模型计算的结果符合得很好。

项目成果

"“Simulation for isotope identification of relativistic heavy particles by an allene-doped liquid argon calorimeter"," T.R.No.95-35,R.I.S.E.,Waseda Univ.(1995)

“通过掺丙二烯液氩量热计对相对论性重粒子进行同位素识别的模拟”，T.R.No.95-35，R.I.S.E.，早稻田大学（1995）

"“Allen-doped liquid argon calorimeter for isotope identification of relativistic heavy ions"," Proc.of UCLA Intern.Conf.(World Scientific). 64-74 (1995)

“用于相对论重离子同位素识别的艾伦掺杂液氩量热仪”，加州大学洛杉矶分校实习会议论文集（世界科学）。64-74（1995）

H.Okada, T.Doke et al.: ""Allene-doped liquid Ar homogenous calorimeter for measurement of heavy ion fragmentation"" Jpn.J.Appl.Phys.(to be published.).

H.Okada、T.Doke 等人：“用于测量重离子碎片的丙二烯掺杂液体 Ar 均质量热计”Jpn.J.Appl.Phys.（待出版）。

E.Shibamura, K.Masuda, T.Doke, et al.: ""Allene-doped-liquid argon calorimeter for isotope identification of relativistic heavy ions"" Proc.of UCLA Intern.Conf.69-74 (1995)

E.Shibamura、K.Masuda、T.Doke 等人：“用于相对论重离子同位素识别的丙二烯掺杂液氩量热计”Proc.of UCLA Intern.Conf.69-74 (1995)

H.Okada, T.Doke, et al.: ""Fragmentation cross section of Ni ions of 650 MeV/n energy in liquid Ar"" Phys.Rev.C. (to be published.).

H.Okada、T.Doke 等人：“液态 Ar 中 650 MeV/n 能量的 Ni 离子的碎裂截面” Phys.Rev.C.