# AN INTEGRAL METHOD FOR IDENTIFYING NEUTRON FLUX SPECTRA

## Abstract

A means for identifying an unknown flux spectrum by experimental means in terms of a few characteristic parameters is described. The three parameters that were chosen are nv/sub o/, the"conventional flux" of Westcott; T(E UPSILON = kT), the neutron temperature that is characteristic of a Maxwellian distribution; and Ft, the factor that characterizes the 1/E component of the distribution function. A fourth parameter, mu , characterizes the transition component and is found to vary only slightly for a large class of light-water- moderated reactors. The method of measuring these parameters is based on Gavin's method for the measurement of neutron temperature. The method is extended to include the measurement of F/sub 1/ and broadened by integrating it with an effective cross section index convention. Thus the identification of an unknown neutron flux spectrum and an effective cross section index convention become combined to form a unified system. (auth)

- Authors:

- Publication Date:

- Research Org.:
- Phillips Petroleum Co. Atomic Energy Div., Idaho Falls, Idaho

- Sponsoring Org.:
- US Atomic Energy Commission (AEC)

- OSTI Identifier:
- 4097274

- Report Number(s):
- IDO-16612

- NSA Number:
- NSA-15-009943

- DOE Contract Number:
- AT(10-1)-205

- Resource Type:
- Technical Report

- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61

- Country of Publication:
- United States

- Language:
- English

- Subject:
- PHYSICS; CROSS SECTIONS; DISTRIBUTION; ENERGY; MEASURED VALUES; NEUTRON FLUX; NEUTRONS; PROBABILITY; REACTORS; SPECTRA; STATISTICS; TEMPERATURE; TRANSIENTS; WATER MODERATOR

### Citation Formats

```
Nisle, R G.
```*AN INTEGRAL METHOD FOR IDENTIFYING NEUTRON FLUX SPECTRA*. United States: N. p., 1960.
Web. doi:10.2172/4097274.

```
Nisle, R G.
```*AN INTEGRAL METHOD FOR IDENTIFYING NEUTRON FLUX SPECTRA*. United States. doi:10.2172/4097274.

```
Nisle, R G. Thu .
"AN INTEGRAL METHOD FOR IDENTIFYING NEUTRON FLUX SPECTRA". United States. doi:10.2172/4097274. https://www.osti.gov/servlets/purl/4097274.
```

```
@article{osti_4097274,
```

title = {AN INTEGRAL METHOD FOR IDENTIFYING NEUTRON FLUX SPECTRA},

author = {Nisle, R G},

abstractNote = {A means for identifying an unknown flux spectrum by experimental means in terms of a few characteristic parameters is described. The three parameters that were chosen are nv/sub o/, the"conventional flux" of Westcott; T(E UPSILON = kT), the neutron temperature that is characteristic of a Maxwellian distribution; and Ft, the factor that characterizes the 1/E component of the distribution function. A fourth parameter, mu , characterizes the transition component and is found to vary only slightly for a large class of light-water- moderated reactors. The method of measuring these parameters is based on Gavin's method for the measurement of neutron temperature. The method is extended to include the measurement of F/sub 1/ and broadened by integrating it with an effective cross section index convention. Thus the identification of an unknown neutron flux spectrum and an effective cross section index convention become combined to form a unified system. (auth)},

doi = {10.2172/4097274},

journal = {},

number = ,

volume = ,

place = {United States},

year = {1960},

month = {12}

}