Observation of large change of 7Be decay rate in Au and Al2O3 and its implications

Precise measurement of theBe7(p,γ)B8Junghans1, Mohrmann2, Snover3 et al. 2003Phys. Rev. C140342794View full textAdd to dashboardCite

“…[30,31,32]). We have taken the difference between the half-life in Au ( ∼53.31 d) and LiF (53.12 d) as representative of the uncertainty due to host material (see Table 1 of [30]), which introduces an additional ±0.4% uncertainty in the conversion of the measured activities to N Be (t).…”

Lifetime Measurement of <SUP>7</SUP>Be in Beryllium Metal Crystal

“…5) In experiments to determine the decay rate of 7 Be compounds, different chemical forms and/or host materials have been investigated by several groups. [6][7][8][9][10][11][12] Differences found in the decay rate of 7 Be as a function of different chemical forms, host materials and under high pressure have until now been limited almost to within 0.2%. In recent studies, however, large variations have been observed as a function of different chemical forms and pressures.…”

New measurement of 7Be half-life in different metallic environments

“…Starting from 1949 [1], many experiments were done in order to measure variations of the 7 Be half-life depending on the host chemical environment. Although the half-life changes are in most cases lower than 0.2% [2], some authors found larger variations [3,4,5].…”

“…a pure 7 Be beam is implanted in host materials in order to virtually reduce to zero the implantation damage and avoid changes of the sample stoichiometry. Table 1 shows the experimen- [3] 16 MeV H C60 cages, -52.68 ± 0.05 γ irradiation metallic 9 Be, -53.12 ± 0.05 A. Ray [4] 7 MeV H Au, 1.8 µm Moreover, the 7 Be half-life has been independently measured in 3 different laboratories in order to reduce the effects of possible systematic errors.…”