Nuclear spectroscopic studies of neutron-rich nuclei far from stability

远离稳定的富中子核的核能谱研究

• 批准号: 61490019
• 负责人: OKANO Kotoyuki
• 金额: $ 2.56万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61490019/
• 关键词: Neutron-rich Nuclei; Nuclear Fission; On-line Isotope Separator; New Isotope; ^<154>Pr; ^<155>Nd; ^<156>Pm; 核分光学; ベータ崩壊; 【^(155)Nd】; 【^(156)Pm】

Nuclear spectroscopic studies on neutron-rich fission-produced nuclei have been performed using the on-line isotope separator KUR-ISOL. A new type high-temperature ion source, a large Si(Li) detector and a data aquisition system have been prepared by this grant-in-aid and have effectively been used for the following studies:1) A nwe isotope ^<156>Pm has been discovered among the fission products of ^<235>U. 34 new -ray lines have been assigned to this isotope.2) A new isotope ^<155>Nd has been discovered. The half-life was determined as 9.5 0.7 s and 4 -ray lines have been assigned to this isotope.3) A new isotope ^<154>Pr has recently been discovered with increased beam intensity of KUR-ISOL for rare-earth elements. The half-life is 2.3 0.1 s and 10 new -ray lines have been identified to originate from this isotope.4) Nuclear spectroscopic studies have been performed on the transitional nuclei ^<147>Ba, ^<147>La and ^<147>Ce. Internal conversion electrons and -rays have been precisely measured and a lot of new lines and levels have been identified. The data analyses are now in progress.We are now further improving the ion source and skimmer system to increase the beam intensity of ISOL several times. Further studies on new isotopes and on extremely neutron-rich isotopes will be continued to a deep understanding of nuclear structure of nuclei far from stability.

利用在线同位素分离器KUR-ISOL对丰中子裂变产生的核进行了核能谱研究。用该助学金研制了新型高温离子源、大型Si(Li)探测器和数据采集系统，并有效地用于以下研究：1)在~(235)&gt；U的裂变产物中发现了一种新的同位素^&lt；155&gt；Pm。测得S的半衰期为9.50.7时，并给出了该同位素的4条谱线。3)最近发现了一种新的稀土元素的同位素^&lt；154&gt；Pr，并增加了Kur-isol的束流强度。半衰期为2.30.1 S，已确定有10条新的谱线起源于该同位素。4)对过渡核^&lt；147&gt；Ba，^&lt；147&gt；La和^&lt；147&gt；Ce进行了核谱研究。对内转换电子和射线进行了精确测量，发现了许多新的谱线和能级。数据分析目前正在进行中，我们正在进一步改进离子源和撇渣器系统，以将ISOL的束流强度提高几倍。对新的同位素和极富中子的同位素的进一步研究将继续下去，以深入了解核的核结构，而不是稳定性。

项目成果

川瀬洋一他: 京都大学原子炉実験所テクニカル・レポート. (1988)

Yoichi Kawase 等人：京都大学反应堆研究所技术报告（1988 年）。

Y. Kawase,; K. Okano; K. Aoki.: "Mass Separation of Rare-earth Elements by a High-Temperature Thermal Ion Source Coupled with a He-jet System" Nucl. Instrum. Methods. B 26. 341-344 (1987)

Y.川濑;

岡野事行: J.Phys.Soc.Jpn.55. 715-718 (1986)

冈野琴之：J.Phys.Soc.Jpn.55（1986）。

川瀬洋一,岡野事行: Z.Phys.A-Atomic Nuclei. 330. 231-232 (1988)

河濑洋一、冈野琴行：Z.Phys.A-原子核 330. 231-232 (1988)

岡野事行,川瀬洋一,青木一彦: Proc.First Asian Symposium on Research Reactors. 175-186 (1986)

Kotoyuki Okano、Yoichi Kawase、Kazuhiko Aoki：Proc.第一届亚洲研究堆研讨会 175-186 (1986)。