A new scheme for isomer pumping and depletion with high-power lasers
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909702807355392 |
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| author | Yang, C. -J. Spohr, K. M. Cernaianu, M. Doria, D. Ghenuche, P. Horny, V. |
| author_facet | Yang, C. -J. Spohr, K. M. Cernaianu, M. Doria, D. Ghenuche, P. Horny, V. |
| contents | We propose a novel scheme for the population and depletion of nuclear isomers. The scheme combines the $γ$-photons with energies $\gtrsim 10$ keV emitted during the interaction of a contemporary high-intensity laser pulse with a plasma and one or multiple photon beams supplied by intense lasers. Due to nonlinear effects, two- or multi-photon absorption dominates over the conventional multi-step one-photon process for an optimized gamma flash. Moreover, this nonlinear effect can be greatly enhanced with the help of externally supplied low-energy photons coming from another laser. These low-energy photons act such that the effective cross-section experienced by the $γ$-photons becomes tunable, growing with the intensity $I_0$ of the beam. Assuming $I_{0}\sim 10^{18}$ Wcm$^{-2}$ for the photon beam, an effective cross-section as large as $10^{-21}$ cm$^2$ to $10^{-28}$ cm$^2$ for the $γ-$photon can be achieved. Thus, within state-of-the-art 10 PW laser facilities, the yields from two-photon absorption can reach $10^6$ to $10^9$ isomers per shot for selected states that are separated from their ground state by E2 transitions. Similar yields for transitions with higher multipolarities can be accommodated by multi-photon absorption with additional photons provided. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07909 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A new scheme for isomer pumping and depletion with high-power lasers Yang, C. -J. Spohr, K. M. Cernaianu, M. Doria, D. Ghenuche, P. Horny, V. Nuclear Theory Nuclear Experiment We propose a novel scheme for the population and depletion of nuclear isomers. The scheme combines the $γ$-photons with energies $\gtrsim 10$ keV emitted during the interaction of a contemporary high-intensity laser pulse with a plasma and one or multiple photon beams supplied by intense lasers. Due to nonlinear effects, two- or multi-photon absorption dominates over the conventional multi-step one-photon process for an optimized gamma flash. Moreover, this nonlinear effect can be greatly enhanced with the help of externally supplied low-energy photons coming from another laser. These low-energy photons act such that the effective cross-section experienced by the $γ$-photons becomes tunable, growing with the intensity $I_0$ of the beam. Assuming $I_{0}\sim 10^{18}$ Wcm$^{-2}$ for the photon beam, an effective cross-section as large as $10^{-21}$ cm$^2$ to $10^{-28}$ cm$^2$ for the $γ-$photon can be achieved. Thus, within state-of-the-art 10 PW laser facilities, the yields from two-photon absorption can reach $10^6$ to $10^9$ isomers per shot for selected states that are separated from their ground state by E2 transitions. Similar yields for transitions with higher multipolarities can be accommodated by multi-photon absorption with additional photons provided. |
| title | A new scheme for isomer pumping and depletion with high-power lasers |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2404.07909 |