ADOPTED LEVELS, GAMMAS for 18N
Authors: R. Spitzer, J.H. Kelley | Citation: ENSDF | Cutoff date: 30-Jun-2021
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=13896 keV 19 | S(n)= 2828 keV 24 | S(p)= 15208 keV 25 | |||
Reference: 2021Wa16 |
References: | |||
A | 18C β- decay | B | 19C β-n decay |
C | 2H(17N,p) | D | 9Be(11B,2pγ) |
E | 12C(18N,X) | F | 9Be(18O,p2α) |
G | 9Be(18O,18N):MOMENT | H | 9Be(19N,18N) |
I | 9Be(22Ne,18N) | J | 9Be(40Ar,18N) |
K | 12C(22Ne,18N) | L | 14C(7Li,3He) |
M | 14C(18O,18N) | N | 18O(π-,γ) |
O | 18O(n,p) | P | 18O(d,2He) |
Q | 18O(t,3He) | R | 18O(7Li,7Be) |
S | 18O(11B,11C) | T | 18O(18O,18N) |
U | 28Si(p,18N):SPALLATION | V | 181Ta(18O,18NG) |
W | 181Ta(22Ne,18N) | X | 232Th(p,18N) |
Y | 232Th(18O,18N),(22Ne,18N) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
0.0 | AB DEFGHIJKLMNOPQR TUVWXY | 1- | 619 ms 2 % β- = 100 % β-n = 12.0 13 % β-α = 12.2 6 | ||||
114.71 10 | ABCD H P R V | (2-) | 0.40 ns 11 % IT = 100 | 114.7 1 | 100 | 0.0 | 1- |
587.39 20 | AB D H LM ST V | (2-) | % IT = 100 | 472.7 2 | 100 16 | 114.71 | (2-) |
742.0 4 | CD H L R V | (3-) | % IT = 100 | 154.6 3 627 1 | 20 100 | 587.39 114.71 | (2-) (2-) |
1170 20 | C N | (1-) | % IT = 100 | ||||
1734.75 19 | A | (1,2) | % IT = 100 | 1147.8 4 1619.9 3 1734.8 4 | 68 20 100 25 100 25 | 587.39 114.71 0.0 | (2-) (2-) 1- |
2210 | C R | % IT = 100 | |||||
2405.0 9 | R V | 0.11 ps +51-7 % IT = 100 | 1663.0 8 | 100 | 742.0 | (3-) | |
2614.35 21 | A | 1+ | % IT = 100 | 879.7 2 2025.3 8 2499.3 4 2614.2 4 | 44 4 7 5 41 9 100 11 | 1734.75 587.39 114.71 0.0 | (1,2) (2-) (2-) 1- |
2.9E3 2 ? | N | ||||||
6.9E3 2 ? | N | ||||||
8.5E3 2 ? | N | ||||||
10.1E3 2 ? | N |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
114.71 | (2-) | 0.40 ns 11 % IT = 100 | E(level): From least squares fit to (Ex: Eγ), (115: 114.7 1), (587: 472.7 2), (742: 154.6 3, 627 1), (1735: 1147.8 4, 1619.9 3, 1734.8 4), (2405: 1663.0 8), (2614: 879.7 2, 2025.3 8, 2499.3 4, 2614.2 4) from averages of γ energies given in 18C β- (1991Pr03), 9Be(11B,2pγ) (2008Wi05) and 181Ta(18O,18Nγ) (2020Zi03). Jπ(level): Suggested by theory (1984Ba24). See also (1982Ol01,1991Pr03). |
587.39 | (2-) | % IT = 100 | E(level): From least squares fit to (Ex: Eγ), (115: 114.7 1), (587: 472.7 2), (742: 154.6 3, 627 1), (1735: 1147.8 4, 1619.9 3, 1734.8 4), (2405: 1663.0 8), (2614: 879.7 2, 2025.3 8, 2499.3 4, 2614.2 4) from averages of γ energies given in 18C β- (1991Pr03), 9Be(11B,2pγ) (2008Wi05) and 181Ta(18O,18Nγ) (2020Zi03). Jπ(level): Suggested by theory (1984Ba24). See also (1982Ol01,1991Pr03). |
742.0 | (3-) | % IT = 100 | E(level): From least squares fit to (Ex: Eγ), (115: 114.7 1), (587: 472.7 2), (742: 154.6 3, 627 1), (1735: 1147.8 4, 1619.9 3, 1734.8 4), (2405: 1663.0 8), (2614: 879.7 2, 2025.3 8, 2499.3 4, 2614.2 4) from averages of γ energies given in 18C β- (1991Pr03), 9Be(11B,2pγ) (2008Wi05) and 181Ta(18O,18Nγ) (2020Zi03). Jπ(level): Suggested by theory (1984Ba24). See also (1982Ol01,1991Pr03). |
1734.75 | (1,2) | % IT = 100 | E(level): From least squares fit to (Ex: Eγ), (115: 114.7 1), (587: 472.7 2), (742: 154.6 3, 627 1), (1735: 1147.8 4, 1619.9 3, 1734.8 4), (2405: 1663.0 8), (2614: 879.7 2, 2025.3 8, 2499.3 4, 2614.2 4) from averages of γ energies given in 18C β- (1991Pr03), 9Be(11B,2pγ) (2008Wi05) and 181Ta(18O,18Nγ) (2020Zi03). Jπ(level): See (1993Ch06). |
2405.0 | 0.11 ps +51-7 % IT = 100 | E(level): From least squares fit to (Ex: Eγ), (115: 114.7 1), (587: 472.7 2), (742: 154.6 3, 627 1), (1735: 1147.8 4, 1619.9 3, 1734.8 4), (2405: 1663.0 8), (2614: 879.7 2, 2025.3 8, 2499.3 4, 2614.2 4) from averages of γ energies given in 18C β- (1991Pr03), 9Be(11B,2pγ) (2008Wi05) and 181Ta(18O,18Nγ) (2020Zi03). | |
2614.35 | 1+ | % IT = 100 | E(level): From least squares fit to (Ex: Eγ), (115: 114.7 1), (587: 472.7 2), (742: 154.6 3, 627 1), (1735: 1147.8 4, 1619.9 3, 1734.8 4), (2405: 1663.0 8), (2614: 879.7 2, 2025.3 8, 2499.3 4, 2614.2 4) from averages of γ energies given in 18C β- (1991Pr03), 9Be(11B,2pγ) (2008Wi05) and 181Ta(18O,18Nγ) (2020Zi03). Jπ(level): See (1993Ch06). |
E(level) | E(gamma) | Comments |
742.0 | 627 | I(γ): From (2008Wi05) |
1734.75 | 1734.8 | I(γ): α discrepancy exists between the (1991Pr03) Table 1 and Table 3 γ-ray intensities for Ex=1734 keV; we use values from Table 1. This choice is necessary to reproduce their relative β- feedings to 18N*(1734,2614). |
2405.0 | 1663.0 | I(γ): From (2020Zi03) |
Prior reviews: 1972Aj02, 1978Aj05, 1983Aj01, 1987Aj02, 1995Ti07.
Shell Model analysis of 18N:
The ground state spin of 18N is Jπ=1- (1982Ol01) while a simple shell-model analysis predicts Jπ=2-. Detailed discussion is given (1983Sh44, 1984Ba24, 2012Yu07, 2018Ji07).
See other relevant theoretical analysis in:
1988PoZS, 1993Pa14, 1993Po11, 1997Ba54, 2000Zh42, 2004La24, 2004Ne16, 2004Su23, 2005Fo13, 2006Ko02, 2016Ma06, 2018Fo04, 2018Fo17, 2019Fo08
Other relevant reaction studies:
1981SuZS, 1987Su06: Systematic measurement of μ- capture rates.
1983As01, 1984As05: 18O(π-,π0). Studied isospin dependence of single-charge-exchange reactions for (π|+,π0) reactions at LAMPF. See also (1980Ge09, 1982ArZT).
1998Mu17: Theoretical analysis on μ capture rates on light nuclei.
1999He33: Theoretical analysis of astrophysically relevant neutron capture in unstable nitrogen nuclei
2019Zh29: Calculated μ- spalation yields on Ar leading to 18N, which is a source of background in the DUNE neutrino detector.