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USNDP

10He (2004TI06)


(See Energy Level Diagrams for 10He)

GENERAL: References to articles on general properties of 10He published since the previous review (1988AJ01) are grouped into categories and listed, along with brief descriptions of each item, in the General Tables for 10He located on our website at (www.tunl.duke.edu/nucldata/General_Tables/10he.shtml).

See also Table 10.1 preview 10.1 [Table of Energy Levels] (in PDF or PS).

1. 1H(11Li, 2p)10He Qm = -15.302

10He has been observed in quasifree proton-knockout reaction with 83 MeV/A 11Li incident on targets of CH2 (1997KO07). The preliminary value determined for the decay energy for 10He → 8He + 2n is 1.7 ± 0.3(stat.) ± 0.3(syst.) MeV.

2. 2H(11Li, 3He)10He Qm = -9.808

Reaction products from 61 MeV/A 11Li incident on targets of CD2 and C were studied in experiments described in (1994KO16, 1995KO27). The transfer reaction 2H(11Li, 3He)10He as well as the final state interaction of particles 8He + n + n emitted in fragmentation were considered. Invariant-mass measurements for 8He + n + n coincidences were used. Evidence was obtained for a 10He resonance at 1.2 ± 0.3 MeV above the 8He + n + n threshold with a width Γ ≤ 1.2 MeV.

3. 10Be(14C, 14O)10He Qm = -41.191

The double charge-exchange reaction 10Be(14C, 14O)10He was studied at Elab = 334.4 MeV (1994OS04, 1995BO10, 1999BO26). See also (1995OSZX, 1995VO05, 1996OS1A, 1998BO1M). The measured Q-value for the 10He ground state resonance is -41.19 ± 0.07 MeV which corresponds to a mass excess of 48.81 ± 0.07 MeV. This is also the value adopted in (2003AU03). 10He is then particle unstable against 2n emission by 1.07 ± 0.07 MeV. The measured width of the ground state resonance is Γ = 0.3 ± 0.2 MeV. Excited states are reported at Ex = 3.24 ± 0.20 MeV, Γ = 1.0 ± 0.3 MeV and Ex = 6.80 ± 0.07 MeV, Γ = 0.6 ± 0.3 MeV. Widths of the two excited-state resonances are described using R-matrix calculations by (1994OS04). See Table 10.2 preview 10.2 (in PDF or PS).