
^{15}Be (1991AJ01)(Not illustrated) ^{15}Be has not been observed. The calculated mass excess is 51.18 MeV: see (1981AJ01). ^{15}Be is then unstable with respect to ^{14}Be + n and ^{13}Be + 2n by 3.4 and 0.04 MeV, respectively. (1985PO10) calculate [in a (0 + 1))ℏω model space] that the first four states of ^{15}Be at 0, 0.07, 2.32, 3.10 MeV have, respectively, J^{π} = 5/2^{+}, 3/2^{+}, 9/2^{+}, 7/2^{+}. See also (1987SA15; theor.).
