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GENERAL: See (83AJ01) and Table 19.21 [Table of Energy Levels] (in PDF or PS).

Nuclear models:(BR83E, PO83A).

Special states:(BI83O, BR83E, PO83A, AN86U).

Electromagnetic transitions:(BR82K, BR83E, AL85K).

Astrophysical questions:(WA81O, WI82C, LA86C).

Applications:(BO82I).

 Complex reactions involving ¹⁹Ne:(DE81L, JA83A, GR84A, BE85O, GR86M, HA86BB, RI87B).

Pion capture and reactions (See also reaction 8.):(ME83D, DA84E, HU84J).

Hypernuclei:(AS84D).

Other topics:(AR83D, BI83O, BR83E, AL85K, AN85E).

Ground state of ¹⁹Ne:(BU83D, AN83D, AR83D, AN85E, HA85K, BR87F).



1. 19Ne(β+)19F

Qm = 3.2384

We adopt the half-life of ¹⁹Ne suggested by (AD83A): 17.34 ± 0.09 sec. See also (78AJ03). The decay is principally to ¹⁹F_g.s.: see Table 19.23 (in PDF or PS). The ¹⁹Ne decay to ¹⁹F*(0.11) [J^π = 1/2⁺ --> 1/2^-] proceeds by vector and axial vector weak currents, with the former making a negligible contribution. The measured decay rates are roughly an order of magnitude smaller than predicted using the 0 h-bar ω + 1 h-bar ω shell model (AD81C, AD83A). The decay of polarized ¹⁹Ne is consistent with time-reversal invariance: see (SC83K, HA84). See also (AD83B, AD83C, AD83D, VA83, AD84D, SI84D, AD85D, CA85D, GR85F, WI86E) and (CA83 [see for discussion of weak magnetism form factor and for search for heavy neutrinos], GI83C, VO83E, BO84A, HO84, GI85F, BR86Y; theor.).

2. 15O(α, γ)19Ne

Qm = 3.5294

(LA86C) have recalculated the ¹⁵O(α, γ) direct capture rate at stellar energies. See also (MA87C) and (DE87A; theor.).

3. (a) 16O(3He, γ)19Ne	Qm = 8.4433
(b) 16O(3He, n)18Ne	Qm = -3.196	Eb = 8.4433
(c) 16O(3He, p)18F	Qm = 2.0321
(d) 16O(3He, d)17F	Qm = -4.8931
(e) 16O(3He, 3He)16O
(f) 16O(3He, α)15O	Qm = 4.9139
(g) 16O(3He, 7Be)12C	Qm = -5.5744

Excitation functions at 90° for γ_0-2, γ_3-5 and γ₆ [reaction (a)] have been measured for E(³He) = 3 to 19 MeV (WA83B): see Table 19.24 (in PDF or PS) for a listing of the resonances reported in this and in other channels. See also (83AJ01) and (LE81B, HA85J, BA86QQ, CO87C; theor.).

4. 16O(α, n)19Ne

Qm = -12.1345

Gamma transitions have been observed from the first six excited states of ¹⁹Ne: see Table 19.25 (in PDF or PS) in (78AJ03) and Table 19.21 (in PDF or PS) here. Angular distributions of many neutron groups have been studied at E_α = 41 MeV: see (83AJ01).

5. 16O(6Li, t)19Ne

Qm = -7.351

This reaction and the mirror reaction ¹⁶O(⁶Li, ³He)¹⁹F have been studied at E(⁶Li) = 24, 35, 36 and 46 MeV: see (78AJ03, 83AJ01). Table 19.13 (in PDF or PS) displays the analog states observed in the two reactions. In addition triton groups are reported to states with E_x = 6.08, 6.28, 6.85, 7.21, 8.08, 8.45, 8.94, 9.81, 10.01, 11.08, 11.24, 11.40, 12.56 [all ± 0.02], 13.1, 13.22, 14.18, 14.44, 14.78 [remaining, ± 0.03] MeV. See also (CU83A).

6. 16O(10B, 7Li)19Ne

Qm = -9.344

This as well as the analog reaction [¹⁶O(¹⁰B, ⁷Be)¹⁹F] have been studied at E(¹⁰B) = 100 MeV. On the basis of similar yields and E_x, and in addition to the low-lying analogs, it is suggested that the following pairs of states are analogs in ¹⁹F - (¹⁹Ne): 8.98 (8.94), 11.33 (11.09), 12.79 (12.48), 14.15 (14.17), 14.99 (14.61) and 15.54 (15.40) [± 100 keV]; however, problems of energy resolution are evident. See (83AJ01) for references on this and on other heavy-ion induced reactions.

7. 17O(3He, n)19Ne

Qm = 4.2997

Neutron-γ coincidence measurements lead to the determination of excitation energies [E_x = 4032.9 ± 2.4, 4140 ± 4, 4197.1 ± 2.4, 4379.1 ± 2.2, 4549 ± 4, 4605 ± 5, 4635 ± 4 and (5097 ± 10) keV], τ_m and branching ratios (see Table 19.21 (in PDF or PS)). On the basis of these it is suggested that ¹⁹Ne*(4.14, 4.20) are the analogs of ¹⁹F*(4.03, 4.00) [J^π = 9/2^-, 7/2^-] and that ¹⁹Ne*(4.55, 4.60) are the analogs of ¹⁹F*(4.556, 4.550) [J^π = 5/2⁺, 3/2^-]. There is no evidence for a reported state at E_x = 4.78 MeV: see (78AJ03).

8. 18O(p, π-)19Ne

Qm = -134.813

This reaction (at E_{pol. p} = 201 MeV) selectively populates stretched 2p-1h states, in particular ¹⁹Ne*(4.64) [J^π = 13/2⁺] and a structure near 10 MeV. Angular distributions and A_y are reported for ¹⁹Ne*(0, 2.80, 4.6) (KE86). See also (VI82A), (JA86I) and (BE84C; theor.).

9. 19F(p, n)19Ne

Qm = -4.0207

Neutron measurements are shown in Table 19.24 (in PDF or PS) of (72AJ02). Excited states of ¹⁹Ne determined from γ-spectra are displayed in Table 19.25 (in PDF or PS) of (78AJ03). Branching ratio and τ_m measurements are summarized in Table 19.2 (in PDF or PS) here. For the g-factor of ¹⁹Ne*(0.24) see Table 19.21 (in PDF or PS). Recently angular distributions have been measured at E_p = 160 MeV to ¹⁹Ne*(0[0], 1.54[(0 + 2)], 5.4[0], 6.2[(0 + 1)], 7.1[(0 + 1)], 7.7[(0 + 1)], 8.60[(0)], 10.2[(1)], 11.0[0], 12.1) (RA84H; [L in brackets] also forward σ(θ) at E_p = 120 MeV). See (RA84H, WA85K) for discussions of the GT strengths. See also ²⁰Ne, (RA83E, TA84H) and (BA85Y; applications).

10. 19F(3He, t)19Ne

Qm = -3.2570

Angular distributions have been obtained for the triton groups to ¹⁹Ne*(0.24, 1.54, 2.79) at E(³He) = 26 MeV: see (78AJ03).

11. 20Ne(3He, α)19Ne

Qm = 3.7092

Alpha groups have been observed to ¹⁹Ne states with E_x < 10.6 MeV: see Tables 19.21 (in PDF or PS) and 19.25 (in PDF or PS). Angular distributions have been measured for E(³He) = 10 to 35 MeV: see (72AJ02). DWBA analysis of the strongest transitions leads to the l and J^π values shown in Table 19.25 (in PDF or PS). ¹⁹Ne*(0, 0.24, 1.54, 2.79) are identified as members of the K = 1/2⁺ rotational band [with ¹⁹Ne*(4.38) as the 7/2⁺ member] and ¹⁹Ne*(0.28, 1.51, 1.62) with the K^π = 1/2^- band. Candidates for the 7/2^- and 9/2^- members of the K = 1/2^- band are thought to be ¹⁹Ne*(4.15, 4.20). Possible matching of other ¹⁹Ne states with those in ¹⁹F is also discussed: see (72AJ02). For lifetime and radiative decay measurements see Table 19.21 (in PDF or PS). See also (CL81C; theor.).

12. 21Ne(p, t)19Ne

Qm = 15.147

At E_p = 40 MeV the angular distributions to ¹⁹Ne*(0.24, 4.03, 5.09) are well described by L = 2, 0 and 4, respectively. ¹⁹Ne*(4.03), J^π = 3/2⁺, has a dominant 5p-2h configuration. ¹⁹Ne*(5.09) has π = + and its J is consistent with 5/2. At E_p = 45 MeV the triton group to a state with E_x = 7.620 ± 0.025 MeV has an angular distribution [L = 0] which is similar to that for ¹⁹F*(7.66): both are thought to be the analogs of the (J^π; T) = (3/2⁺; 3/2) 0.096 MeV first excited state of ¹⁹O. The ground state of ¹⁹O has J^π = 5/2⁺; L for the anaolg state should be 2. ¹⁹Ne*(0, 2.79) are also populated: see (78AJ03, 83AJ01).