ADOPTED LEVELS, GAMMAS for 17Ne
Authors: J.H. Kelley, G.C. Sheu | Citation: ENSDF | Cutoff date: 16-Jan-2018
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-18.7×103 keV 10 | S(n)= 15558 keV 20 | S(p)= 1469 keV 8 | Q(α)= -9040 keV 10 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 1H(17Ne,p) | B | 1H(17Ne,15O2P) |
| C | 1H(18Ne,d) | D | 9Be(12C,X),12C(12C,X) |
| E | 9Be(17Ne,17Ne’) | F | 9Be(17Ne,X) |
| G | 9Be,12C,27Al(17Ne,X) | H | 9Be(18Ne,17Ne) |
| I | 9Be(20Ne,17Ne) | J | 16O(3He,2n) |
| K | 16O(14N,13B) | L | 18Na p decay |
| M | 19F(p,3n) | N | 19Mg 2p decay:4.0 PS |
| O | 20Ne(3He,6He) | P | MGO(p,17Ne) |
| Q | MG(p,17Ne) | R | SI(17Ne,X) |
| S | NI(20Ne,17Ne) | T | AU(17Ne,17Ne’γ) |
| U | PB(17Ne,17Ne) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) |
| 0.0 | A CD FG IJ LMNOPQRSTU | 1/2- | 109.2 ms 6 % ε = 100 % εp = 95.2 46 % εα = 2.77 19 | ||
| 1288 8 | C K O T | (3/2,1/2)- | % IT = 100 | 1288 | 100 |
| 1749 8 | E H O TU | (5/2,7/2)- | % p = 100 | ||
| 1908 15 | C H K O TU | 1/2+,(3/2,5/2)+ | % p ≈ 100 | ||
| 2651 12 | C E O TU | 3/2+,5/2,7/2- | % p = 100 | ||
| 2997 11 | K O T | (7/2,5/2)- | |||
| 3415 38 | U | (5/2-) | % p = 100 | ||
| 3548 20 | E K O T | (9/2,11/2)- | % p = 100 | ||
| 4010 10 | O T | (3/2,5/2)+ | |||
| 4487 22 | O T | ||||
| 5141 62 | O TU | ||||
| ≈5.3E3? | K | ||||
| 5722 23 | O T | ||||
| 6132 35 | O T | ||||
| 6366 22 | O T | ||||
| 10.06E3 15 | U |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 1/2- | 109.2 ms 6 % ε = 100 % εp = 95.2 46 % εα = 2.77 19 | T=3/2, μ=+0.7873 14 (2005Ge06) ΔM=16500.4 keV 4: From ISOLTRAP measurement in (2008Ge07). Note: most level energies are taken from (1998Gu10) who measured ΔM=16453 keV 32. Since other measurements (2002Ch44,2017Br07) tend to support the level energy differences found in (1998Gu10), those relative level energy spacings are preserved in the present evaluation. E(level): ΔM=16500.4 keV 4: From ISOLTRAP measurement in (2008Ge07). Note: most level energies are taken from (1998Gu10) who measured ΔM=16453 keV 32. Since other measurements (2002Ch44,2017Br07) tend to support the level energy differences found in (1998Gu10), those relative level energy spacings are preserved in the present evaluation. |
| 1288 | (3/2,1/2)- | % IT = 100 | B(E2)=0.0090 18 (2016Ma42) Γ2p/Γ <1.6×10-4 (2017Sh29). E(level): Γ2p/Γ <1.6×10-4 (2017Sh29). |
Theoretical analyses of 17Ne
Nuclear Mass and Level Properties:
General analyses of the 17Ne nuclear properties are given in (1973Re17,1978Gu10,2004Ge02,2018Fo04). Comparisons of the 17Ne level properties with those of levels in the 17N mirror nucleus are found in (1996Ti02, 2004Ga07,2006Fo08,2006Li18,2018Fo02).
Halo Character
Because of the unbound nature of 16F, the nucleus 17Ne is considered a Borromean nuclear system similar to 6,8He and 11Li. The low binding energy suggests the ground or first excited states may exibit properties that can be described as a 15O core surrounded by a diffuse 2-proton halo. Detailed studies on 17Ne are found in (1990Ha29, 1995Zh35, 1997Li22, 1998Na01, 2001Fo05, 2003Zh29, 2004Ta40, 2005Gr11, 2008Ne13, 2013Zh27, 2016Hw01). More general analyses of one- and two- nucleon halo nuclides, including 17Ne, are given in (1994Fe01, 1995Ta06, 1999Kn04, 2001Oz04, 2002Gu10, 2007Be58, 2011Al11, 2014Ch39, 2017Ah08).
Possible soft dipole excitations and pygme dipole resonances are discussed in (2011Ol01, 2012Ma12, 2017Lv02).
3-Body nature of 17Ne
Studies of the 2-proton correlations associated with the 3-body nature of 17Ne are given in (2001Gr29, 2003Gr01, 2004Ga10, 2005Ga04, 2005Ga49, 2005Pf01, 2005Pf02, 2007Gr12, 2007Gr13, 2010Oi01)
The 15O+2p resonances of 17Ne are relevant for the 2p capture rate on 15O, see (2006Gr20,2016Ca38). The Γ2p width of the Ex=1288 keV: Jπ=3/2- state is of particular interest (2000Gr16) since it is bound to one proton emission, unbound to 2p emission, but γ decays 100%.
3-body nature of 19Mg
Some states in 17Ne are important for the 2p decay of 19Mg and the 2p+17Ne system, see (2001Mu23, 2003Gr04, 2003Gr24). See other results in (2000Gr18, 2004Pf02, 2007Fo07, 2010Gr06, 2013Ol02, 2017Go17, 2017Kw01)
β-decay studies
The β decay of 17Ne is rather complex. The first forbidden decay to 17F is stronger than expected (1972To03, 1994Jo04, 1997Mi08, 1999Ba21, 2000Ni14, 2003Sm02); the observation may be connected with the halo nature of 17Ne. See other general analyses and comparison with 17N decay in (1965Ha31, 1970Wi02). The decay is dominated by β-p reactions to levels in 16O (1963Ba63, 1964Da13, 1964Fl03, 1964Mc16, 1965Ha20, 1967Es02, 1988Bo39, 2002Ch61, 2002Mo19). Additional β-α branches to 13C are also present. See theoretical discussion in (1973Ha77, 1977Ce05)