# Extensions of the direct-semidirect model for calculating the high energy component of fast-nucleon induced gamma spectra

## Abstract

This section reviews extensions and variations of the direct-semidirect (DSD) model for understanding the high-energy component of gamma spectra resulting from radiative capture of fast nucleons; i.e., the part of the spectrum that is not amenable to standard statistical model (Hauser-Feshbach) treatments. We describe recent results on the extension of the DSD model to unbound final states, including comparison with proton and neutron capture data. The importance of including convective-current magnetic radiation to explain proton capture angular distributions in the 30 MeV region is shown. We conclude with a brief discussion of a model closely related to the DSD, the pure-resonance model.

- Authors:

- Publication Date:

- Research Org.:
- Lawrence Livermore National Lab., CA (US)

- Sponsoring Org.:
- US Department of Energy (US)

- OSTI Identifier:
- 15006436

- Report Number(s):
- UCRL-ID-139090

TRN: US0400767

- DOE Contract Number:
- W-7405-ENG-48

- Resource Type:
- Technical Report

- Resource Relation:
- Other Information: PBD: 22 May 2000

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; CAPTURE; GAMMA SPECTRA; NEUTRON REACTIONS; NUCLEONS; PROTONS; RADIATIONS; STATISTICAL MODELS

### Citation Formats

```
Dietrich, F S.
```*Extensions of the direct-semidirect model for calculating the high energy component of fast-nucleon induced gamma spectra*. United States: N. p., 2000.
Web. doi:10.2172/15006436.

```
Dietrich, F S.
```*Extensions of the direct-semidirect model for calculating the high energy component of fast-nucleon induced gamma spectra*. United States. doi:10.2172/15006436.

```
Dietrich, F S. Mon .
"Extensions of the direct-semidirect model for calculating the high energy component of fast-nucleon induced gamma spectra". United States. doi:10.2172/15006436. https://www.osti.gov/servlets/purl/15006436.
```

```
@article{osti_15006436,
```

title = {Extensions of the direct-semidirect model for calculating the high energy component of fast-nucleon induced gamma spectra},

author = {Dietrich, F S},

abstractNote = {This section reviews extensions and variations of the direct-semidirect (DSD) model for understanding the high-energy component of gamma spectra resulting from radiative capture of fast nucleons; i.e., the part of the spectrum that is not amenable to standard statistical model (Hauser-Feshbach) treatments. We describe recent results on the extension of the DSD model to unbound final states, including comparison with proton and neutron capture data. The importance of including convective-current magnetic radiation to explain proton capture angular distributions in the 30 MeV region is shown. We conclude with a brief discussion of a model closely related to the DSD, the pure-resonance model.},

doi = {10.2172/15006436},

journal = {},

number = ,

volume = ,

place = {United States},

year = {2000},

month = {5}

}

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