Multiscale evolution of charmed particles in a nuclear medium

Fan, W. (ORCID:0000000287168601); Vujanovic, G.; Bass, S. A.; Majumder, A.; Angerami, A.; Arora, R.; Cao, S.; Chen, Y.; Dai, T.; Du, L.; Ehlers, R.; Elfner, H.; Fries, R. J.; Gale, C.; He, Y.; Heffernan, M.; Heinz, U.; Jacak, B. V.; Jacobs, P. M.; Jeon, S.; Ji, Y.; Kauder, K.; Kasper, L.; Ke, W.; Kelsey, M.; Kordell, M.; Kumar, A.; Latessa, J.; Lee, Y. -J.; Liyanage, D.; Lopez, A.; Luzum, M.; Mak, S.; Mankolli, A.; Martin, C.; Mehryar, H.; Mengel, T.; Mulligan, J.; Nattrass, C.; Oliinychenko, D.; Paquet, J. -F.; Putschke, J. H.; Roland, G.; Schenke, B.; Schwiebert, L.; Sengupta, A.; Shen, C.; Silva, A.; Sirimanna, C.; Soeder, D.; Soltz, R. A.; Soudi, I.; Staudenmaier, J.; Strickland, M.; Tachibana, Y.; Velkovska, J.; Wang, X. -N.; Wolpert, R. L.; Zhao, W.

doi:10.1103/physrevc.107.054901

DOE OSTI · 1985781

Multiscale evolution of charmed particles in a nuclear medium

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Abstract

Parton energy-momentum exchange with the quark gluon plasma (QGP) is a multiscale problem. In this work, we calculate the interaction of charm quarks with the QGP within the higher twist formalism at high virtuality and high energy using the Modular All Twist Transverse-scattering Elastic-drag and Radiation (MATTER) model, while the low-virtuality and high-energy portion is treated via a linearized Boltzmann transport formalism. Coherence effect that reduces the medium-induced emission rate in the MATTER model is also taken into account through a virtuality-dependent qˆ, leaving the simultaneous dependence of qˆ on heavy quark mass and virtuality for future studies. The interplay between these two formalisms is studied phenomenologically and used to produce a first description of the D-meson and charged hadron nuclear modification factor R AA across multiple centralities. As a result, all calculations were carried out utilizing the Jet Energy-loss Tomography with a Statistically and Computationally Advanced Program Envelope framework.

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS Jets & heavy flavor physics Relativistic heavy-ion collisions

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Fan, W. (ORCID:0000000287168601), Vujanovic, G., Bass, S. A., Majumder, A., Angerami, A., Arora, R., Cao, S., Chen, Y., Dai, T., Du, L., Ehlers, R., Elfner, H., Fries, R. J., Gale, C., He, Y., Heffernan, M., Heinz, U., Jacak, B. V., Jacobs, P. M., Jeon, S., Ji, Y., Kauder, K., Kasper, L., Ke, W., Kelsey, M., Kordell, M., Kumar, A., Latessa, J., Lee, Y. -J., Liyanage, D., Lopez, A., Luzum, M., Mak, S., Mankolli, A., Martin, C., Mehryar, H., Mengel, T., Mulligan, J., Nattrass, C., Oliinychenko, D., Paquet, J. -F., Putschke, J. H., Roland, G., Schenke, B., Schwiebert, L., Sengupta, A., Shen, C., Silva, A., Sirimanna, C., Soeder, D., Soltz, R. A., Soudi, I., Staudenmaier, J., Strickland, M., Tachibana, Y., Velkovska, J., Wang, X. -N., Wolpert, R. L., Zhao, W.. 2023-05-01. Multiscale evolution of charmed particles in a nuclear medium. https://doi.org/10.1103/physrevc.107.054901

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DOE OSTI2026

Design-informed neutronics assessment of long-lived fission product transmutation in a tokamak fusion reactor blanket

This study presents a neutronics-based assessment of the feasibility and viability of transmuting six major long-lived fission products (LLFPs) from light-water reactors, namely 99 Tc, 129 I, 79 Se, 93 Zr, 126 Sn, and 135 Cs, within the blanket region of a tokamak fusion reactor, using the MIT ARC design as a concrete fusion configuration. Monte Carlo neutronics simulations were performed to evaluate LLFP transmutation and to compare the results with a reference boiling water reactor (BWR). The results indicate that transmutation of all six LLFPs is neutronics-feasible in fusion reactors, with transmutation half-lives significantly shorter than their natural decay half-lives. For elemental targets, transmutation of 135 Cs, 126 Sn, and 93 Zr was found potentially viable, as the net mass transmuted exceeded that achievable in the reference BWR under identical target volume and irradiation time. When isotopically separated targets were considered, transmutation of 126 Sn and 93 Zr appeared potentially viable. A parametric study demonstrated that plasma geometry modifications can enhance local neutron flux, increasing the transmuted 93 Zr mass by approximately 33% and reducing the transmutation half-life from approximately 240 years to 180 years. Repositioning the target and adjusting material layer thickness reduced the transmutation half-life of 93 Zr to 67 years and increased the net mass transmuted by a factor of 50. Furthermore, these results demonstrate that fusion reactors can enable LLFP transmutation beyond the practical limits of thermal fission reactors and highlight the critical role of reactor and blanket design optimization. Engineering and fuel-cycle considerations required for deployment are beyond the scope of this neutronics-focused study.

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Multiscale evolution of charmed particles in a nuclear medium

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