Online The decay rate variation of r Be implanted into platinum and aluminum host materials has been measured via detecting the 478 keV γ-rays from the first excited state of r Li populated in the electron capture d...Online The decay rate variation of r Be implanted into platinum and aluminum host materials has been measured via detecting the 478 keV γ-rays from the first excited state of r Li populated in the electron capture decay of7r Be. The result (λpt - λA1)λ0 = (-0.17 ± 0.13)% is obtained. It is smaller than the theoretical estimate from the TB-LMTO calculation (0.38%). This is quite different from our previous study which showed a 1arger decay rate variation ((0.8 ± 0.2)%) than the TB-LMTO calculation (0.30%) of 7 Be in palladium and gold. It is suggested that the effective quasi-free electron density near the implanted ions in different metal host materials may play an important role in r Be EC decay rate variation in addition to the electronic affinity and crystal structure of different host materials.展开更多
The γ-rays and protons from Ed = 20keY deuterons incident on a D-Ti target are measured. The branching ratio of the 2H (d, γ)4He reaction to the ^2H (d, p)^3H reaction is obtained to be Гγ/Гp= (1.06 ±0...The γ-rays and protons from Ed = 20keY deuterons incident on a D-Ti target are measured. The branching ratio of the 2H (d, γ)4He reaction to the ^2H (d, p)^3H reaction is obtained to be Гγ/Гp= (1.06 ±0.42) ×10^-7, and the astrophysical S factor of the ^2He(d, γ)^4He reaction is deduced to be (5.7±2.4)×10^-6.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 10305020,
文摘Online The decay rate variation of r Be implanted into platinum and aluminum host materials has been measured via detecting the 478 keV γ-rays from the first excited state of r Li populated in the electron capture decay of7r Be. The result (λpt - λA1)λ0 = (-0.17 ± 0.13)% is obtained. It is smaller than the theoretical estimate from the TB-LMTO calculation (0.38%). This is quite different from our previous study which showed a 1arger decay rate variation ((0.8 ± 0.2)%) than the TB-LMTO calculation (0.30%) of 7 Be in palladium and gold. It is suggested that the effective quasi-free electron density near the implanted ions in different metal host materials may play an important role in r Be EC decay rate variation in addition to the electronic affinity and crystal structure of different host materials.
文摘The γ-rays and protons from Ed = 20keY deuterons incident on a D-Ti target are measured. The branching ratio of the 2H (d, γ)4He reaction to the ^2H (d, p)^3H reaction is obtained to be Гγ/Гp= (1.06 ±0.42) ×10^-7, and the astrophysical S factor of the ^2He(d, γ)^4He reaction is deduced to be (5.7±2.4)×10^-6.