Information on mass chains and nuclides

3	4
5	6
7	8
9	10
11	12
13	14
15	16
17	18
19	20
Group Info
Publications
HTML
General Tables
Level Diagrams
Tables of EL's
NSR Key# Retrieval
ENSDF
Excitation Functions
Thermal N Capt.
G.S. Decays
Half-Lives Table
TUNL Dissertations
NuDat at BNL
Useful Links
Citation Examples
Home
Sitemap
Directory
Email Us

WWW TUNL

GENERAL: See 3 [Electromagnetic Transitions in A = 18-19] (in PDF or PS), 18.3 [General Table ] (in PDF or PS), 18.4 [Table of Energy Levels] (in PDF or PS) and 18.5 [Radiative decays in ¹⁸N] (in PDF or PS).

Mass of ¹⁸N: The atomic mass excess derived from the Q-value of the ¹⁸O(⁷Li, ⁷Be)¹⁸N reaction and adopted by (1993AU05) is 13.117 ± 0.020 MeV (1983PU01). ¹⁸N is then stable with respect to breakup into ¹⁷N + n by 2.825 MeV. See (1983AJ01) for the earlier work.

1. 18N(β-)18O

Qm = -13.899

The half-life of ¹⁸N is 0.624 ± 0.012 s (1982OL01). The decay branches are displayed in 18.18 (in PDF or PS). The nature of the decay leads to J^π = 1^- for the ¹⁸N ground state (1982OL01). See also (1983SN03), and see the measurements on beta branching reported in (1989ZH04) which indicate a total branching ratio to alpha-particle-emitting states in ¹⁸O of at least 12.2%. A delayed-neutron emission probablility P_n = (14.3 ± 2.0)% was measured by (1991RE02). More recently a study reported by (1994SC01) gave P_n = (2.2 ± 0.4)% for transitions to neutron unstable states in ¹⁸O above E_x = 9.0 MeV. See also reaction 22 under ¹⁸O.

2. 14C(7Li, 3He)18N

Qm = -10.121

The preliminary work described in (1983AJ01) has not been published.

3. 14C(18O, 14N)18N

Qm = -13.740

At E(¹⁸O) = 92.2 MeV groups are observed to the ground state of ¹⁸N (unresolved) and to an excited state at E_x = 575 ± 25 keV (1980NA14).

4. 18C(β-)18N

Qm = 11.807

See reaction 1 under ¹⁸C. Branching to states in ¹⁸N was measured by (1991PR03) and is presented here in 18.6 (in PDF or PS). These authors measured the total branching probability to gamma emitting states of ¹⁸N to be P_γ = 81 ± 5%. Measurements of γ-ray energies and branching lead to the level energies displayed in 18.7 (in PDF or PS) and ¹⁸N radiative decays in 18.5 (in PDF or PS).

5. 18O(π-, π0)18N

Qm = -9.305

See (1983AS01, 1984AS05).

6. 18O(t, 3He)18N

Qm = -13.880

See (1983AJ01).

7. 18O(7Li, 7Be)18N	Qm = -14.761
	Q0 = -14761 ± 20 keV (1983PU01)

At E(⁷Li) = 52 MeV, ⁷Be groups are observed corresponding to the excitation of the states displayed in 18.4 (in PDF or PS) (1983PU01).

8. 18O(11B, 11C)18N

Qm = -15.881

See (1983PU01).