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![]() 14Be (86AJ01)(See the Isobar Diagram for 14Be)
14Be has been observed in the 4.8 GeV proton bombardment of
uranium [see (76AJ04)], in the
bombardment of 232Th by 145 MeV 15N ions (OG82; forward
differential cross section is 4 x 10-5 mb/sr) and in the
14C(π-, π+)14Be
reaction (GI84E;
Eπ- = 164 MeV, θ = 5°). It has not
been observed in the 48Ca(14C,
14Be)48Ti reaction (E(14C) = 87.4
MeV, θ = 4° - 8°) (NA81H). A group in
the (π-, π+) reaction is observed at Q =
-37.08 ± 0.13 MeV [(Value quoted by (GI84E) +
2mec2.)] with a cross section of 0.73 ± 0.19
μb/sr (GI84E).
If this is the ground-state group, the atomic mass excess is 40.10 ±
0.13 MeV. 14Be is then bound by 2.97 and 1.12 MeV,
respectively, with respect to decay into 13Be + n and
12Be + 2n. See also (EP84) and (KI81C, SE81C, AN83D, WI85B; theor.).
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