# Semiempirical description of the mass distribution for the /sup 238/U (n,f) process in the 1. 5- to 15-MeV energy interval

## Abstract

Different empirical and semiempirical systematics have been developed to predict unmeasured fission product yields. One of these methods, originally proposed by Musgrove et al. and developed by Cook et al., is used to describe the energy dependence of the mass distribution in neutron-induced fission of /sup 238/U utilizing published yield data. The available measured cumulative yields of fission products are collected for monoenergetic /sup 238/U(n,f) processes. The mass distributions at approximate neutron energies of 1.5, 2.0, 3.0, 3.9, 5.2, 6.0, 7.0, 7.9, 9.0, and 14.7 MeV are fitted by the sum of five Gaussian functions. The energy dependence of the parameters of the Gaussian functions can also be described by semiempirical formulas. The 2sigma error of the mass yields calculated by the fitted parameters can be estimated to be about 10% in the peak regions and 20% in the valley region for the above neutron energies. The formulas with the given parameters can be useful in estimating unmeasured /sup 238/U fission product yields for any monoenergetic and nonmonoenergetic neutron irradiations in the range of 1.5 to 15 MeV. The method has been tested in a study of the /sup 238/U fission by neutrons having a Watt spectrum produced in themore »

- Authors:

- Publication Date:

- Research Org.:
- Inst. of Experimental Physics, Kossuth Univ., Debrecen

- OSTI Identifier:
- 6247194

- Resource Type:
- Journal Article

- Journal Name:
- Nucl. Sci. Eng.; (United States)

- Additional Journal Information:
- Journal Volume: 88:2

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 22 GENERAL STUDIES OF NUCLEAR REACTORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; FISSION PRODUCTS; MASS; NEUTRON REACTIONS; MEV RANGE; URANIUM 238; CALCULATION METHODS; ENERGY DEPENDENCE; FISSION YIELD; GAUSS FUNCTION; IRRADIATION; TESTING; THERMAL FISSION; WATT FISSION SPECTRUM; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BARYON REACTIONS; ENERGY RANGE; EVEN-EVEN NUCLEI; FISSION; FUNCTIONS; HADRON REACTIONS; HEAVY NUCLEI; ISOTOPES; MATERIALS; NEUTRON SPECTRA; NUCLEAR REACTION YIELD; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; RADIOACTIVE MATERIALS; RADIOISOTOPES; SPECTRA; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES; YIELDS; 220100* - Nuclear Reactor Technology- Theory & Calculation; 654003 - Radiation & Shielding Physics- Neutron Interactions with Matter

### Citation Formats

```
Nagy, S., Boda, I., Daroczy, S., Matajsz, I., and Raics, P.
```*Semiempirical description of the mass distribution for the /sup 238/U (n,f) process in the 1. 5- to 15-MeV energy interval*. United States: N. p., 1984.
Web.

```
Nagy, S., Boda, I., Daroczy, S., Matajsz, I., & Raics, P.
```*Semiempirical description of the mass distribution for the /sup 238/U (n,f) process in the 1. 5- to 15-MeV energy interval*. United States.

```
Nagy, S., Boda, I., Daroczy, S., Matajsz, I., and Raics, P. Mon .
"Semiempirical description of the mass distribution for the /sup 238/U (n,f) process in the 1. 5- to 15-MeV energy interval". United States.
```

```
@article{osti_6247194,
```

title = {Semiempirical description of the mass distribution for the /sup 238/U (n,f) process in the 1. 5- to 15-MeV energy interval},

author = {Nagy, S. and Boda, I. and Daroczy, S. and Matajsz, I. and Raics, P.},

abstractNote = {Different empirical and semiempirical systematics have been developed to predict unmeasured fission product yields. One of these methods, originally proposed by Musgrove et al. and developed by Cook et al., is used to describe the energy dependence of the mass distribution in neutron-induced fission of /sup 238/U utilizing published yield data. The available measured cumulative yields of fission products are collected for monoenergetic /sup 238/U(n,f) processes. The mass distributions at approximate neutron energies of 1.5, 2.0, 3.0, 3.9, 5.2, 6.0, 7.0, 7.9, 9.0, and 14.7 MeV are fitted by the sum of five Gaussian functions. The energy dependence of the parameters of the Gaussian functions can also be described by semiempirical formulas. The 2sigma error of the mass yields calculated by the fitted parameters can be estimated to be about 10% in the peak regions and 20% in the valley region for the above neutron energies. The formulas with the given parameters can be useful in estimating unmeasured /sup 238/U fission product yields for any monoenergetic and nonmonoenergetic neutron irradiations in the range of 1.5 to 15 MeV. The method has been tested in a study of the /sup 238/U fission by neutrons having a Watt spectrum produced in the thermal fission of /sup 235/U.},

doi = {},

journal = {Nucl. Sci. Eng.; (United States)},

number = ,

volume = 88:2,

place = {United States},

year = {1984},

month = {10}

}