Abstract
It is important to understand the effect of compression on the decay rate of because of its significance in calculating decay rate at the solar core and corresponding neutrino flux. We have measured that the decay rate of is faster in the smaller spatial confinement of Pd lattice compared to the larger spatial confinement of Pb lattice by (0.82 ± 0.16)%, indicating the effect of compression on the decay rate of ion, because low and similar electron affinities of Pd and Pb cannot produce any observable effect. Similar results were observed earlier by applying high external pressure on lattice. The density functional calculations underpredict the increase of decay rate under compression by a large factor, although they can account for the effect of electron affinity reasonably well. The unexpectedly large increase (∼1%) of decay rate under compression (25–40 GPa) compared to the state-of-the-art calculations could have implications on the calculated decay rate at the solar core.
- Received 22 October 2019
- Revised 24 January 2020
- Accepted 10 February 2020
DOI:https://doi.org/10.1103/PhysRevC.101.035801
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