Nuclear data explorer · compound nucleus
5He
5He is formed when 3H + 2H fuse. Its levels just above each threshold are the resonances that set those reactions' rates.
Channels and what has been measured
Every EXFOR reaction that forms 5He: entrance pair (rows) and the quantities measured (columns), with the energies covered.
| Reaction | Datasets | σ | S | dσ/dΩ | Ay | Y | ωγ | MACS | other | Fitted in evaluation |
|---|---|---|---|---|---|---|---|---|---|---|
| 3H(d,n)4He | 102 | 233 keV – 230 MeV | 148 keV – 69 keV | 666 keV – 230 MeV | 860 keV – 11 MeV | — (0) | — (0) | 1 | 319 keV | |
| 4He(n,el) | 53 | 520 meV – 19 MeV | — (0) | 20440 keV – 110 MeV | 21210 keV – 40 MeV | — (0) | 4800 keV – 18 MeV | 1 | 220 meV | |
| 3H(d,el) | 18 | — (0) | — (0) | 1172 keV – 22 MeV | — (0) | — (0) | 313 keV – 6 MeV | — (0) | 422 MeV | |
| 2H(t,n)4He | 16 | 75 keV – 600 keV | 15 keV – 47 keV | 730 keV – 6.7 MeV | — (0) | 16 keV – 51 keV | — (0) | — (0) | — (0) | |
| 3H(d,γ)5He | 16 | 315 keV – 780 keV | — (0) | 4240 keV – 5.2 MeV | 2240 keV | — (0) | 2610 keV | — (0) | 525 keV – 610 keV | |
| 4He(n,d)3H | 10 | 318 MeV – 250 MeV | — (0) | 418 MeV – 250 MeV | 240 MeV | — (0) | — (0) | 1 | — (0) | |
| 3H(d,α)n | 3 | — (0) | — (0) | — (0) | — (0) | — (0) | 313 keV – 6 MeV | — (0) | — (0) | |
| 2H(t,el) | 2 | — (0) | — (0) | 2240 keV – 1.4 MeV | — (0) | — (0) | — (0) | — (0) | — (0) | |
| 2H(t,p)4H | 1 | — (0) | — (0) | 123 MeV | — (0) | — (0) | — (0) | — (0) | — (0) | |
| 4He(n,γ)5He | 1 | 120 meV | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) |
19 more reactions: heavier projectiles, several outgoing particles or inclusive data
| Reaction | Datasets | σ | S | dσ/dΩ | Ay | Y | ωγ | MACS | other | Fitted in evaluation |
|---|---|---|---|---|---|---|---|---|---|---|
| 3H(d,x) | 14 | — (0) | — (0) | 322 MeV | — (0) | — (0) | — (0) | — (0) | 112.9 MeV – 22 MeV | |
| 4He(n,tot) | 13 | 9150 meV – 120 MeV | — (0) | — (0) | — (0) | — (0) | 218 MeV | 1 | 180 keV – 9.6 MeV | |
| 4He(n,0) | 8 | — (0) | — (0) | — (0) | — (0) | — (0) | 8920 keV – 18 MeV | — (0) | — (0) | |
| 3H(d,n+p) | 7 | — (0) | — (0) | 12.3 MeV – 3.7 MeV | — (0) | — (0) | — (0) | — (0) | 68.1 MeV – 8.3 MeV | |
| 3H(d,2n) | 6 | — (0) | — (0) | 119 MeV | — (0) | — (0) | — (0) | — (0) | 58.3 MeV – 22 MeV | |
| 4He(n,ths) | 3 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 318 meV | |
| 2H(t,n+p) | 2 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 223 MeV | |
| 3H(d,0) | 2 | — (0) | — (0) | — (0) | — (0) | — (0) | 213 keV – 6 MeV | — (0) | — (0) | |
| 2H(t,0) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | — (0) | |
| 2H(t,2n) | 1 | — (0) | — (0) | 12 MeV – 24 MeV | — (0) | — (0) | — (0) | — (0) | — (0) | |
| 2H(t,tot) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | — (0) | |
| 2H(t,x) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 12.4 MeV – 6.6 MeV | |
| 4He(n,2n) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | |
| 4He(n,2n+p) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | |
| 4He(n,3n+p) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | |
| 4He(n,abs) | 1 | 120 meV | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | |
| 4He(n,n+d) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | |
| 4He(n,n+p) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 1 | — (0) | |
| 4He(n,non) | 1 | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | — (0) | 171 MeV |
Level scheme
Adopted levels of 5He from ENSDF, with the particle thresholds and the Gamow window of the selected channel drawn across them.
- level in the window with a measured ωγ
- level in the window with no ωγ in EXFOR
- Jπ in parentheses or in italics is tentative.
Resonances in the window
Levels between the 3H(d,n)4He threshold (S = 16855 keV) and the top of the Gamow window at T9 = 0.8 (213 keV above it), with the resonance strengths ωγ EXFOR holds for them.
Looking for measured strengths…
| E (keV) | E_r (keV, c.m.) | Jπ | T½ or Γ | ωγ measured |
|---|---|---|---|---|
| ENSDF lists no level in this window. | ||||
A strength is matched to a level when its resonance energy plus the threshold lies within max(3 keV, 3σ) of the level energy.
Levels of 5He (1)
| E (keV) | Jπ | T½ or Γ | γ branches |
|---|---|---|---|
| 0 | 3/2- | Γ = 648 keV | – |