ADOPTED LEVELS, GAMMAS for 18C
Authors: J. Kelley, C.G. Sheu | Citation: ENSDF | Cutoff date: 01-May-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=1.181×104 keV 4 | S(n)= 4.18×103 keV 3 | S(p)= 2.609×104 keV 21 | Q(α)= -1.746×104 keV 14 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 1H(19C,18CG) | B | 9Be(18C,18C’γ) |
| C | 9Be(19N,18CG) | D | 9Be(40Ar,18C) |
| E | 9Be(48Ca,18C) | F | 18O(π-,π+) |
| G | C(36S,xγ) | H | 19B β-n decay |
| I | 48Ca(18O,18C) | J | 232Th(18O,18C) |
| K | 232Th(22Ne,18C) | L | U(p,18C),(n,18C) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABCDEFGHIJKL | 0+ | 92 ms 2 % β- = 100 % β-n = 31.5 15 | |||||
| 1588 8 | ABC FG I | 2+ | 15.5 ps 25 | 1588 8 | 100 | E2 | 0.0 | 0+ |
| 2515 10 | ABC G | (2+) | < 3.2 ps | 927 7 2515 30 | 86 12 14 12 | 1588 0.0 | 2+ 0+ | |
| 3972 20 | AB G | (2,3)+ | 2384 17 | 100 | 1588 | 2+ | ||
E(level): From analysis of γ-rays in (2008St18, 2009Ko02, 2012Vo05)
E(γ): From analysis of γ-rays in (2008St18, 2009Ko02, 2012Vo05)
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| E(level) | E(gamma) | Comments |
Theoretical analysis:
See discussion on N-N interactions and pairing effects in (1997Po14, 2000De24, 2002Gr14, 2007Ma53, 2008Ha17, 2012Ha21, 2012Id04, 2012Yu04, 2013Sh17, 2016La17, 2017Me03).
See discussion on the nuclear radius of 18C in (1971St40, 1992La13, 1993Po11, 1996Sh13, 1996Su24, 2001Go24, 2002Me12, 2004Ya05, 2008Ca29, 2009Ch45, 2009Pa46, 2010Ca15, 2011Al11, 2011Fo18, 2016Fo24).
Other general shell-model, potential-model and cluster-model analyses of ground-state energies, excited state energies, moments, deformation lengths, etc. can be found in (1964In03, 1971Fi11, 1987Bl18, 1993Pa14, 1995Ho13, 1996Gr21, 1996Ka14, 1996Re19, 1997Ba54, 1997Ho04, 1998Sh16, 1999Ha61, 1999Sh16, 2001Ka66, 2002Ka73, 2003Sa50, 2003Su09, 2003Th06, 2004Th11, 2005Ga31, 2005Ka54, 2006Ko02, 2006Le33, 2006Sa29, 2006Ta28, 2009Pu01, 2010Co05, 2011Co18, 2013Lu02, 2014Eb02, 2014Ja14, 2014Ro22, 2014Sa13, 2015Ka02, 2015Sh21).
2010Ya03: The authors utilized a 16C+n+n 3-body model to analyze levels that could participate in the 17C(n,γ)18C reaction under the condisions of a core-collapse supernovae, where 18C is suggested as a semi-waiting point for r-process nucleosynthesis. See additional references in the text.
2011Ba01: The authors analyze the probability for population of 18C states in β-delayed proton emission events from 19C where the halo neutron is converted to a proton and then emitted.
Other Experimental Work:
2017He04: E(18C)=425 MeV/nucleon, Pb target, Coulomb dissociation, σ’s to 17C*(0,0.22,0.33 MeV).
1995Ba28: E(18C)≈86.2 MeV/nucleon, Be target, FWHM(17C parallel momentum dist)lab=110 MeV/c 12, σ1n=34.8 mb 21. See also 1997Or03.
2000Sa47: E(18C)=47 MeV/nucleon, carbon target,FWHM(17C parallel momentum dist)lab=126 MeV/c 5, σ1n=115 mb 18. The authors suggest Jπ=0+.
2001Oz03: E(18C)=955 MeV/nucleon, carbon target, σinteraction=1104 mb 15, analyzed relation of σi to effective matter radius: Rrms≈2.82 fm 4.
See also results on 18C fragment momentum distributions from the breakup of heavier projectiles in (2011Oz01, 2012Ko38, 2015Mo17).