ADOPTED LEVELS for 12O
Authors: J.H. Kelley, J.E. Purcell and C.G. Sheu | Citation: Nucl. Physics A968, 71 (2017) | Cutoff date: 1-Jan-2017
Full ENSDF file | Adopted Levels (PDF version)
| S(p)= -320 keV 50 | Q(α)= -5570 keV 30 | ||||
| Reference: 2017WA10 |
| References: | |||
| A | 1H(14O,t) | B | 9Be(13O,12O) |
| C | 12C(π+,π-) | D | 16O(α,8He) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0.0 | ABCD | 0+ | < 72 keV % 2p = 100 |
| 1.62E3 11 ? | A C | 0+ | 1.2 MeV 7 % 2p = 100 |
| 1968 52 | BC | (2+) | 0.48 MeV 11 % 2p = 100 |
| 4.2E3 | A | 1- | 2.2 MeV % 2p = 100 |
| 7.0E3 | A | 2.2 MeV % 2p = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | < 72 keV % 2p = 100 | T=2 Eres(10C+2p)(keV)=1638 24. |
| 1.62E3 | 0+ | 1.2 MeV 7 % 2p = 100 | T=2 Eres(10C+2p)(keV)=3.26×103 11. E(level): It is unclear whether the groups observed at Ex=1.62 MeV and Ex=1.97 MeV represent unique states. |
| 1968 | (2+) | 0.48 MeV 11 % 2p = 100 | T=2 Eres(10C+2p)(keV)=3606 60. |
| 4.2E3 | 1- | 2.2 MeV % 2p = 100 | T=2 Eres(10C+2p)(keV)=5800 AP. |
| 7.0E3 | 2.2 MeV % 2p = 100 | Eres(10C+2p)(keV)=8600 AP. |
Uncertainties in the ground state energy and width have dominated theoretical studies on 12O (1988Co15, 1997Kr10, 1999Ba03, 1999Sh43, 2001Le22, 2002Gr03, 2003Fo14, 2010Fo08, 2013Fo10, 2014RoZZ). The analog states in 12Be are utilized to gain insight into the expected 12O struture (1999Sh43, 2006Fo11, 2011Fo04). The expected width (≈100 keV) is significantly smaller than experimentally reported widths. The 2He decay is energetically possible and has been discussed in (2001Ba31, 2001Gr29, 2002Gr03, 2002Gr25, 2003Ba99, 2003Fo14, 2006Ca05, 2009Le22). See also (2005Ji04, 2006Sa29, 2009Ba41, 2011Sh26, 2016Pa05).