ADOPTED LEVELS for 11O
Authors: C.G. Sheu, J.H. Kelley | Citation: ENSDF | Cutoff date: 29-April-2019
Full ENSDF file | Adopted Levels (PDF version)
| S(p)= -1.56×103 keV | |||||
| Reference: 2017Wa10,2019We03 |
| References: | |||
| A | 9Be(13O,2P+9C) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0 | A | (3/2-) | 1.30 MeV % 2p ≈ 100 |
| 0.49E3 | A | (5/2+) | 1.06 MeV % 2p ≈ 100 |
| 0.69E3 | A | (3/2-) | 1.33 MeV % 2p ≈ 100 |
| 2.12E3 | A | (5/2+) | 1.96 MeV % 2p ≈ 100 |
E(level): Eg.s. from Eres(2p+9C)=4.16 MeV.
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | (3/2-) | 1.30 MeV % 2p ≈ 100 | Erel.(2p+9C) (MeV)=4.16 . |
| 0.49E3 | (5/2+) | 1.06 MeV % 2p ≈ 100 | Erel.(2p+9C) (MeV)=4.65 . |
| 0.69E3 | (3/2-) | 1.33 MeV % 2p ≈ 100 | Erel.(2p+9C) (MeV)=4.85 . |
| 2.12E3 | (5/2+) | 1.96 MeV % 2p ≈ 100 | Erel.(2p+9C) (MeV)=6.28 . |
$ Evidence supporting observation of the unbound ground state of 11O has been reported in (2019We03). α multiplet of unresolved broad states peaked at E(2p+9C)≈4.5 MeV is observed; the analysis supports association with a group of four resonances having Jπ=3/2- and 5/2+.
$ Theoretical Mass Estimates:
$ 2012Ch40: The mass of 11C was predicted using the Isobaric Multiplet Mass Equation. In the article, the authors used the 12Be(p,2n) reaction to identify the 11Lig.s. double isobaric analog state in 11B at Ex=33.57 MeV 8. With this information, and using the appropriate analog state masses of 11Li, 11Be and 11B, using the a, b and c terms of the IMME they predicted the mass excess of the 11O ground state as ΔM=46.70 MeV 84. In this case, 11O is predicted to be unbound to 2p decay by 3.21 MeV 84.
$ 2013Fo20: α parametrization of mirror energy differences is developed and used to predict the 11Og.s. mass. The formula is presented as MED=S2n-S2p=[a+bS2n-cP(s2)]Z</A1/3, where p(s2) is the fractional parentage in the 2s1/2 orbital. Using a=0.0228(7) (dimensionless), b=0.724(6) MeV and c=2.373(9) MeV (2013Fo01), S2p=-5.41 MeV 11 is predicted.
$ 2013Fo26, 2017Fo14: In (2013Fo26) a potential model is developed to estimate the energies of the s2- and p-shell energies in 11O, and the relationship between the two proton separation energy, S2p, and the fractional occupancy, p(s2), is explored. The sequential decay (via 10N unbound states) and simultaneous 2p decay modes of 11O are estimated in (2017Fo14) using their predicted S2p=-4.49 MeV value. Their conclusion suggests, "Simultaneous decay is predicted to be comparable to or larger than sequential decay. "
$ Others: See also (1974Ir04, 1987Sa15, 2000Po32)
Q-value: From S2p=-4160 keV (2019We03), ΔM(9C)=28.91 MeV and ΔM(11O)=47.65 MeV.