Electron-Capture Decay Rate of 7Be Encapsulated in C60 Cages

Enhanced electron-capture decay rate of 7Be encapsulated in C60 cages.

The decay rate of 7Be electron capture was measured in C60 and Be metal with a reference method. The half-life of 7Be endohedral C60 ((7)Be@C(60)) and 7Be in Be metal (Be metal (7Be)) is found to be 52.68+/-0.05 and 53.12+/-0.05 days, respectively. This amounts to a 0.83% difference in electron-capture decay half-life between (7)Be@C(60) and Be metal (7Be). Our result is a reflection of the dif...

THE 7Be ELECTRON CAPTURE RATE IN THE SUN

For solar conditions, we numerically integrate the density matrix equation for a thermal electron in the eld of a 7 Be ion and other plasma ions and smeared-out electrons. With this technique, we can calculate the capture rate without assuming either the existence of bound states or requiring uctuations to be spherical. Our results are in agreement with previous calculations that are based on a...

Dependence of the decay rate of 7Be on chemical forms

The decay rate of 7Be depends on the electron density at the nucleus and therefore may vary with the chemical environments of the Be atom. Using a 100% efficiency high-purity germanium detector, the decay constants of Be in Be2C(OH2)4, Be(OH)2 and BeO have been measured at unprecedented high precision (of š0.01%), resulting in T1=2 D 53.69 d, 53.42 d, and 54.23 d, respectively. The observed dif...

E¡ect of pressure on the decay rate of 7Be

Beryllium-7 in Be(OH)2 gel was compressed in diamond-anvil pressure cells up to 442 kbar at room temperature. By counting the activity of 7Be, the decay rate for the conversion of 7Be to 7Li via electron capture was measured. The decay constant of 7Be, V, was found to increase, but the rate of increase decreased with increasing pressure. A quadratic regression of the data yields (V3V0)/V0 = (4....

Insertion of Be Atoms in C60 Fullerene Cages: Be@ C60.