# New approach to analyzing and evaluating cross sections for partial photoneutron reactions

## Abstract

The presence of substantial systematic discrepancies between the results of different experiments devoted to determining cross sections for partial photoneutron reactions-first of all, ({gamma}, n), ({gamma}, 2n), and ({gamma}, 3n) reactions-is a strong motivation for studying the reliability and authenticity of these data and for developing methods for taking into account and removing the discrepancies in question. In order to solve the first problem, we introduce objective absolute criteria involving transitional photoneutron-multiplicity functions F{sub 1}, F{sub 2}, F{sub 3}, Horizontal-Ellipsis ; by definition, their values cannot exceed 1.0, 0.5, 0.33, Horizontal-Ellipsis , respectively. With the aim of solving the second problem, we propose a new experimental-theoretical approach. In this approach, reaction cross sections are evaluated by simultaneously employing experimental data on the cross section for the total photoneutron yield, {sigma}{sup expt}({gamma}, xn) = {sigma}{sup expt}({gamma}, n) + 2{sigma}{sup expt}({gamma}, 2n) + 3{sigma}{sup expt}({gamma}, 3n) + Horizontal-Ellipsis , which are free from drawbacks plaguing experimental methods for sorting neutrons in multiplicity, and the results obtained by calculating the functions F{sub theor}{sup 1}, F{sub theor}{sup 2}, F{sub theor}{sup 3}, Horizontal-Ellipsis on the basis of the modern model of photonuclear reactions. The reliability and authenticity of data on the cross sections for ({gamma},more »

- Authors:

- Moscow State University, Skobeltsyn Institute of Nuclear Physics (Russian Federation)

- Publication Date:

- OSTI Identifier:
- 22069295

- Resource Type:
- Journal Article

- Journal Name:
- Physics of Atomic Nuclei

- Additional Journal Information:
- Journal Volume: 75; Journal Issue: 11; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7788

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CROSS SECTIONS; GOLD 197; INDIUM 115; MULTIPLICITY; NUCLEAR REACTION YIELD; PHOTONEUTRONS; PHOTONUCLEAR REACTIONS; TERBIUM 159; TIN 112; TIN 114; TIN 116; TIN 117; TIN 120; TIN 122; TIN 124; ZIRCONIUM 90

### Citation Formats

```
Varlamov, V. V., E-mail: Varlamov@depni.sinp.msu.ru, Ishkhanov, B. S., and Orlin, V. N.
```*New approach to analyzing and evaluating cross sections for partial photoneutron reactions*. United States: N. p., 2012.
Web. doi:10.1134/S1063778812110191.

```
Varlamov, V. V., E-mail: Varlamov@depni.sinp.msu.ru, Ishkhanov, B. S., & Orlin, V. N.
```*New approach to analyzing and evaluating cross sections for partial photoneutron reactions*. United States. doi:10.1134/S1063778812110191.

```
Varlamov, V. V., E-mail: Varlamov@depni.sinp.msu.ru, Ishkhanov, B. S., and Orlin, V. N. Thu .
"New approach to analyzing and evaluating cross sections for partial photoneutron reactions". United States. doi:10.1134/S1063778812110191.
```

```
@article{osti_22069295,
```

title = {New approach to analyzing and evaluating cross sections for partial photoneutron reactions},

author = {Varlamov, V. V., E-mail: Varlamov@depni.sinp.msu.ru and Ishkhanov, B. S. and Orlin, V. N.},

abstractNote = {The presence of substantial systematic discrepancies between the results of different experiments devoted to determining cross sections for partial photoneutron reactions-first of all, ({gamma}, n), ({gamma}, 2n), and ({gamma}, 3n) reactions-is a strong motivation for studying the reliability and authenticity of these data and for developing methods for taking into account and removing the discrepancies in question. In order to solve the first problem, we introduce objective absolute criteria involving transitional photoneutron-multiplicity functions F{sub 1}, F{sub 2}, F{sub 3}, Horizontal-Ellipsis ; by definition, their values cannot exceed 1.0, 0.5, 0.33, Horizontal-Ellipsis , respectively. With the aim of solving the second problem, we propose a new experimental-theoretical approach. In this approach, reaction cross sections are evaluated by simultaneously employing experimental data on the cross section for the total photoneutron yield, {sigma}{sup expt}({gamma}, xn) = {sigma}{sup expt}({gamma}, n) + 2{sigma}{sup expt}({gamma}, 2n) + 3{sigma}{sup expt}({gamma}, 3n) + Horizontal-Ellipsis , which are free from drawbacks plaguing experimental methods for sorting neutrons in multiplicity, and the results obtained by calculating the functions F{sub theor}{sup 1}, F{sub theor}{sup 2}, F{sub theor}{sup 3}, Horizontal-Ellipsis on the basis of the modern model of photonuclear reactions. The reliability and authenticity of data on the cross sections for ({gamma}, n), ({gamma}, 2n), and ({gamma}, 3n) partial reactions-{sigma}{sup eval}({gamma}, in) = F{sub i}{sup theor}{sigma}{sup expt}({gamma}, xn)-were evaluated for the {sup 90}Zr, {sup 115}In, {sup 112,114,116,117,118,119,120,122,124}Sn, {sup 159}Tb, and {sup 197}Au nuclei.},

doi = {10.1134/S1063778812110191},

journal = {Physics of Atomic Nuclei},

issn = {1063-7788},

number = 11,

volume = 75,

place = {United States},

year = {2012},

month = {11}

}