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Nuclear isomers play a key role in the creation of the elements in theuniverse and have a number of fascinating potential applications related to thecontrolled release of nuclear energy on demand. Particularly, $^{93m}$Mo isomeris a good candidate for studying the depletion of nuclear isomer via nuclearexcitation by electron capture. For such purposes, efficient approach for$^{93m}$Mo production needs to be explored. In the present work, we demonstrateexperimentally an efficient production of $^{93m}$Mo through $^{93}$Nb(p, n)reaction induced by intense laser pulse. When a ps-duration, 100-J laser pulseis employed, the $^{93m}$Mo isomer at 2425 keV (21/2$^+$, $T_{1/2}$ = 6.85 h)are generated with a high yield of $1.8\times10^6$ particles/shot. Theresulting peak efficiency is expected to be $10^{17}$ particles/s, which is atleast five orders of magnitudes higher than using classical proton accelerator.The effects of production and destruction of $^{93m}$Mo on the controversialastrophysical p-isotope $^{92}$Mo are studied. It is found that the$^{93}$Nb(p, n)-$^{93m}$Mo reaction is an important production path for^{93m}Mo seed nucleus, and the influence of ^{93m}Mo-^{92}Mo reaction flow on^{92}Mo production cannot be ignored. In addition, we propose to directlymeasure the astrophysical rate of (p, n) reaction using laser-induced protonbeam since the latter one fits the Maxwell-Boltzmann distribution well. Weconclude that laser-induced proton beam opens a new path to produce nuclearisomers with high peak efficiency towards the understanding of p-nucleinucleosythesis.

Efficient production of nuclear isomer $^{93m}$Mo with laser-accelerated proton beam and an astrophysical implication on $^{92m}$Mo production