100-FM-257
Atomic Mass Mass Excess
257.095098855347 amu 88.584 MeV

Level energy (MeV) Spin & parity Half-life Mode of decay Branch ratio (%) Decay energy (MeV)
Ground state (9/2+) 100.5 D 0.2 A 99.79 6.864
Ground state (9/2+) 100.5 D 0.2 SF .21 0

Strong Gamma-rays from Decay of FM-257

Decay mode Half-life Gamma-ray energy (keV) Intensity (%)
A 100.5 D 0.2 61.60 1.45+- 0.08
A 100.5 D 0.2 104.40 0.62+- 0.05
A 100.5 D 0.2 179.40 8.7+- 0.7
A 100.5 D 0.2 241.00 11.0+- 0.6