Observation of new heavy neutron-rice nuclide （239）￣Pa

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Observation of new heavy neutron-rice nuclide （239）￣Pa

更新时间：2021-04-09

- Observation of new heavy neutron-rice nuclide （239）￣Pa
- NUCLEAR TECHNIQUES Issue 12, (1996)
- 作者机构：
  
  中国科学院近代物理研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： O615
- Published：01 December 1996
- 稿件说明：
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[1]李宗伟,牟万统,袁双贵,杨维凡,张学谦,于暹.新重丰中子核素（239）~Pa的观测[J].核技术,1996(12):705-708.

Observation of new heavy neutron-rice nuclide （239）￣Pa[J]. Nuclear techniques, 1996, (12).
[1]李宗伟,牟万统,袁双贵,杨维凡,张学谦,于暹.新重丰中子核素（239）~Pa的观测[J].核技术,1996(12):705-708. DOI：

Observation of new heavy neutron-rice nuclide （239）￣Pa[J]. Nuclear techniques, 1996, (12). DOI：

摘要

以５０ＭｅＶ／ｕ丰中子炮弹１８Ｏ轰击天然铀靶，通过奇异的多核于转移反应产生了２３９Ｐａ，用放射化学分离方法从复杂的反应产物中分离出Ｐａ活性，借助于２３９Ｐａ及其子体２３９Ｕ衰变的观察，鉴别了新重丰中子核素２３９Ｐａ，并测定其半衰期为１０６±３０ｍｉｎ．同时，还发现了能量为５２２．０、５６２．０、６３８．５、６８１．０ｋｅＶ的２３９Ｐａ的四条衰变γ射线。

Abstract

This paper presents the experimental method and result on observation of a new isotope 239Pa.The 239Pa was produced by 50MeV/u neutron-rich projectile（18O）bombarding natural uranium through exotic multi-nucleon transfer reactions.The new heavy neutron-rich nuclide 239Pa was identified for the first time by using chemical separation and observing the decay of 239Pa was determined to be 106 ± 30min. In addition

four decay γ-ray of 239Pa as well as its daughter 239U

the half-life of 239Pa with energy 522.0

562.0.638.5 and 681.0 keV respectively have been found.

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