中子活化R（<italic style="font-style: italic">R</italic>）矩阵元的新表达方式

冯锡璋

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中子活化R（R）矩阵元的新表达方式

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- 中子活化R（R）矩阵元的新表达方式
- A new expression for neutron activation R (R)-matrix elements
- 核技术 1987年10卷第7期
- 作者机构：
  
  中国科学院高能物理研究所
- 作者简介：
- 基金信息：
- DOI：
  中图分类号：
- 收稿日期：1986-01-12，
  
  纸质出版日期：1987-07
- 稿件说明：
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冯锡璋. 中子活化R（R）矩阵元的新表达方式[J]. 核技术, 1987,10(7):27-28,62.

Xizhang Feng. A new expression for neutron activation R (R)-matrix elements[J]. Nuclear techniques, 1987, 10(7): 27-28,62.
冯锡璋. 中子活化R（R）矩阵元的新表达方式[J]. 核技术, 1987,10(7):27-28,62. DOI：

Xizhang Feng. A new expression for neutron activation R (R)-matrix elements[J]. Nuclear techniques, 1987, 10(7): 27-28,62. DOI：

摘要

中子活化

矩阵元

和R矩阵元

[1]

可能是现今表达中子活化分析中各元素之间的相关性的最简单最完善的新方式。

是由（n，

）反应产生的核素

和

的生成率之比值B

°/

°，而R

则是由

°和

°与产生核素

和

的热中子（20℃）俘获反应的截面

和

（或用中子速度=2200ms

-1

时的热中子俘获截面代替）分别计算得出的照射处的表观中子通量之比值

[1]

。

Abstract

In the present paper

a new expression for neutron activation

-matrix elements was given. Use

175

Yb (i or j)—

169

Yb (j or i)

153

Gd (i or j)-

159

Gd (j or i)

103

Ru (i or j)—

Ru (j or i)

Zr (i or j)-

Zr (j or i)as neutron energy spectrum monitor

j as standard

and

as neutron spectrum indicator. Define relative deviation from thermalization: x= (

-1)/ (

)《1

where

and

are the ratios of infinitely dilute resonance integral and thermal neutron capture cross section of i and j respectively. Then

=1+

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where k represents nuclides other than i and j •

series converge rapidly for all k. The accuracy of

will not be affected by the errors of

and

The

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is determined by experiments with high precision. We use simultaneously four kinds of neutron energy spectrum monitors (also used as standards)

use experimental

to determine x

and use x and

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tc calculate

and

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. Then

very reliable results are obtained. This is the mono-standard or small-number-standards method in the neutron activation analysis.

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Keywords

references

冯锡璋等，北京师范大学学报（自然科学版）， 3 , 59 （ 1984 ）。

周云鹿等，核化学与放射化学， 4 , 216 （ 1982 ）.

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中子活化R（R）矩阵元的新表达方式

A new expression for neutron activation R (R)-matrix elements

DOI：

摘要

Abstract

关键词

Keywords

references