Ultra-short lifetime isomer studies from photonuclear reactions using laser-driven ultra-intense γ-ray
arxiv(2024)
摘要
Isomers, ubiquitous populations of relatively long-lived nuclear excited
states, play a crucial role in nuclear physics. However, isomers with half-life
times of several seconds or less barely had experimental cross section data due
to the lack of a suitable measuring method. We report a method of online
γ spectroscopy for ultra-short-lived isomers from photonuclear reactions
using laser-driven ultra-intense γ-rays. The fastest time resolution can
reach sub-ps level with γ-ray intensities >10^19/s (⩾ 8
MeV). The ^115In(γ, n)^114m2In reaction (T_1/2 = 43.1 ms) was
first measured in the high-energy region which shed light on the nuclear
structure studies of In element. Simulations showed it would be an efficient
way to study ^229mTh (T_1/2 = 7 μs), which is believed to be the next
generation of nuclear clock. This work offered a unique way of gaining insight
into ultra-short lifetimes and promised an effective way to fill the gap in
relevant experimental data.
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