Nuclear data explorer · reaction
197Au(n,γ)198Au
All 278 EXFOR datasets of this reaction: who measured it, where and when, what they measured and over which energies.
Gamow window and the gap
Every dataset EXFOR holds for this reaction, drawn by the energies it covers, against the energies a star uses.
278 datasets in 187 EXFOR entries, 1938–2024 · 79 without an energy range, not drawn
- Lowest energy in EXFOR
- 1.78 meV
- Havens Jr et al., 1956; TATTERSALL et al., 1960; Teutsch et al., 1962; HADDAD et al., 1964; Als-Nielsen et al., 1964; Konks et al., 1964; Lu Hanlin et al., 1965; FRIESENHAHN et al., 1968; Samour et al., 1969; Pavlenko et al., 1976; CARTER et al., 1980; MEADOWS et al., 1982; ALLEN et al., 1987; YAMAMOTO et al., 1991; Celenk et al., 1991; YAMAMOTO et al., 1996; Revay et al., 2003; Massimi et al., 2010; Nyarko et al., 2010; Xin-Rong Hu et al., 2021; Luo Hao-Tian et al., 2024 · σ · 12674.002
- Maxwellian averages measured
- 20 sets
- kT from 25.3 meV to 1.42 MeV
- Rate from energies not in EXFOR
- < 0.01%
- at kT = 7.76 keV, smooth estimate
- Energies that matter at kT = 7.76 keV
- Outlined bars are shown but not counted (the rule is under “How these numbers are made”).
- A diamond is a dataset at a single energy. Bars running off the right edge continue to higher energies.
The datasets of the gap map, by quantity
| Quantity | Datasets | E_cm range (keV) |
|---|---|---|
| σcross section | 121 | 0.0291 meV – 14.6 MeV |
| σ→Eₓpartial | 3 | 25.2 meV – 1.33 MeV |
| ωγresonance strength | 20 | 4.88 eV – 208 keV |
| MACSMaxwellian average | 20 | 25.3 meV – 1.42 MeV |
| …other | 35 | 24.9 meV – 13.9 MeV |
How these numbers are made
Lowest measured energy, everywhere in the data explorer: the lowest centre-of-mass energy at which a dataset in EXFOR measures the reaction itself (cross section, S-factor, angular distribution, yield or resonance strength), judged point by point. A point counts when it is a value, not an upper or lower limit, when it lies at least one standard deviation above zero, and when its energy is physical: at least 1 keV for charged particles, and not below the threshold of an endothermic reaction. Not counted: extrapolated, calculated, evaluated or derived values; superseded, deleted or preliminary data; ratios; a single S-factor value, which in EXFOR is a fit result; and indirect methods (Trojan horse, Coulomb dissociation, ANC, surrogate reactions), recognized from EXFOR's method and analysis codes, their text and the title. Frame and unit errors of EXFOR are corrected first, and values the literature shows to be upper limits are read as limits, from a list that gives the evidence for each. Datasets that reach the same energy within 0.5% are all credited, earliest first. Rate from energies not in EXFOR: the share of the rate integrand at that temperature outside the energy ranges the counted datasets cover (from their lowest measured point to their highest), with a constant S-factor (σ ∝ S(E₀)/E · e^−2πη, so the integrand is e^(−E/kT − 2πη)); for a neutron capture, σ ∝ 1/v. Resonances make the real integrand lumpy, so read it as a smooth baseline.
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