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Nuclear Theory·nucl-th

Wednesday·April 17, 2024

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 02

    [Submitted on 15 Apr 2024] (cross-list from physics.optics)

    Multi-photon stimulated grasers assisted by laser-plasma interactions

    C.-J. Yang · K. M. Spohr · D. Doria

    We investigate theoretically the possibility of achieving the stimulated amplification of -rays. Herein, our approach circumvents the so-called ``graser dilemma" through a non-linear, multi-photon mechanism. Our work foresees the combination of a high-intensity flash generated by the interaction of a high-intensity laser pulse with plasma and intensive photons supplied by an additional laser. We show that multi-photon stimulated emission processes can have a larger effective cross-section compared to a one-photon process. The bandwidth of the supplied photons can also be tuned to curtail linewidth broadening. Naturally, Mossbauer transitions can be chosen to apply the scheme in the first instance. Furthermore, we derive that even multi-photon stimulated emission in the form of an anti-Stokes type could allow our scheme to be applied to non-Mossbauer nuclei, provided that the supplied photon energy can be tuned to compensate for the recoil and other broadening induced losses. The graser development can be spearheaded using multi-PW class high-power laser systems such as the 10 PW installation at Extreme Light Infrastructure - Nuclear Physics (ELI-NP) in Romania.

    Comments:
    13 pages, 5 figures
    Subjects:
    physics.optics (physics.optics); Nuclear Theory (nucl-th); Plasma Physics (physics.plasm-ph); Quantum Physics (quant-ph)
    arXiv:
    2404.10025 [pdf]
    3 citations
  2. 03

    [Submitted on 15 Apr 2024] (cross-list from hep-ph)

    Chiral phase transition in soft-wall AdS/QCD with scalar-dilaton coupling

    Sean P. Bartz🇺🇸 · Robert C. Meadows🇺🇸 · Glenn Brock🇺🇸

    The chiral phase boundary of nuclear matter is expected to have a critical point where the rapid crossover of lattice methods at zero chemical potential becomes a first-order phase transition. Phenomenological models based on the AdS/CFT correspondence, known as AdS/ QCD, have succeeded in capturing many features of nuclear matter, with recent progress in producing the expected critical point. We study a model that produces a critical point in the chiral phase diagram by introducing a coupling between the scalar chiral field and the dilaton. We examine the effect of the scalar-dilaton coupling on the critical point. We also study the zero-temperature chiral dynamics, which must allow for spontaneous chiral symmetry breaking in the limit of zero quark mass. We find that when the scalar-dilaton coupling is large enough to ensure correct zero-temperature chiral dynamics, a critical point is present only if the quark mass is greater than 12.8 MeV.

    Comments:
    18 pages, 9 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2404.10104 [pdf]
    PRD(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE