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243 results on '"Hajima, R."'

1. Nondestructive determination of isotopic abundance using multi-energy nuclear resonance fluorescence driven by laser Compton scattering source.

Author

Omer, M., Shizuma, T., Hajima, R., and Koizumi, M.

Subjects
GERMANIUM detectors, HAFNIUM isotopes, FLUORESCENCE, LASER beams, RESONANCE, HEAVY elements, COMPTON scattering
Abstract

We report on the quantitative nondestructive analysis of the natural isotopic abundances of hafnium and tungsten elements using nuclear resonance fluorescence. Metallic samples of hafnium and tungsten were irradiated to six quasi-monochromatic γ -ray beams generated by laser Compton scattering in the energy range of 2.4–3.2 MeV. Multiple nuclei were simultaneously excited at each of the six γ -ray beam energies. A high-purity germanium detector array detected deexcitations of the nuclei. In total, 51 transitions were unprecedentedly employed to estimate the isotopic abundances of heavy elements nondestructively. The estimated abundances of three hafnium isotopes and three tungsten isotopes are consistent with standard known natural abundances within the experimental uncertainties. The deviation from the standard values ranges from 0.18 % to 1.36 %. [ABSTRACT FROM AUTHOR]

Published
2024
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2. International Workshop on Next Generation Gamma-Ray Source

Author

Howell, C. R., Ahmed, M. W., Afanasev, A., Alesini, D., Annand, J. R. M., Aprahamian, A., Balabanski, D. L., Benson, S. V., Bernstein, A., Brune, C. R., Byrd, J., Carlsten, B. E., Champagne, A. E., Chattopadhyay, S., Davis, D., Downie, E. J., Durham, M. J., Feldman, G., Gao, H., Geddes, C. G. R., Griesshammer, H. W., Hajima, R., Hao, H., Hornidge, D., Isaak, J., Janssens, R. V. F., Kendellen, D. P., Kovash, M. A., Martel, P. P., Meissner, Ulf-G., Miskimen, R., Pasquini, B., Phillips, D. R., Pietralla, N., Savran, D., Schindler, M. R., Sikora, M. H., Snow, W. M., Springer, R. P., Sun, C., Tang, C., Tiburzi, B., Tonchev, A. P., Tornow, W., Ur, C. A., Wang, D., Weller, H. R., Werner, V., Wu, Y. K., Yan, J., Zhao, Z., Zilges, A., and Zomer, F.

Subjects
Nuclear Experiment, Nuclear Theory, Physics - Accelerator Physics
Abstract

A workshop on The Next Generation Gamma-Ray Sources sponsored by the Office of Nuclear Physics at the Department of Energy, was held November 17--19, 2016 in Bethesda, Maryland. The goals of the workshop were to identify basic and applied research opportunities at the frontiers of nuclear physics that would be made possible by the beam capabilities of an advanced laser Compton beam facility. To anchor the scientific vision to realistically achievable beam specifications using proven technologies, the workshop brought together experts in the fields of electron accelerators, lasers, and optics to examine the technical options for achieving the beam specifications required by the most compelling parts of the proposed research programs. An international assembly of participants included current and prospective $\gamma$-ray beam users, accelerator and light-source physicists, and federal agency program managers. Sessions were organized to foster interactions between the beam users and facility developers, allowing for information sharing and mutual feedback between the two groups. The workshop findings and recommendations are summarized in this whitepaper.

Published
2020

4. Opportunities for TeV Laser Acceleration

Author

Kando, M., Kiriyama, H., Koga, J. K., Bulanov, S., Chao, A. W., Esirkepov, T., Hajima, R., and Tajima, T.

Subjects
Physics - Plasma Physics, Physics - Accelerator Physics
Abstract

A set of ballpark parameters for laser, plasma, and accelerator technologies that define for electron energies reaching as high as TeV are identified. These ballpark parameters are carved out from the fundamental scaling laws that govern laser acceleration, theoretically suggested and experimentally explored over a wide range in the recent years. In the density regime on the order of 10^{16} cm^{-3}, the appropriate laser technology, we find, matches well with that of a highly efficient high fluence LD driven Yb ceramic laser. Further, the collective acceleration technique applies to compactify the beam stoppage stage by adopting the beam-plasma wave deceleration, which contributes to significantly enhance the stopping power and energy recovery capability of the beam. Thus we find the confluence of the needed laser acceleration parameters dictated by these scaling laws and the emerging laser technology. This may herald a new technology in the ultrahigh energy frontier., Comment: 16 pages, 2 figures, 1 table, submitted to AIP Conference Proceedings

Published
2008
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9. International workshop on next generation gamma-ray source

Author

Howell, C. R., Ahmed, M. W., Afanasev, A., Alesini, D., Annand, J. R. M., Aprahamian, A., Balabanski, D. L., Benson, S., V, Bernstein, A., Brune, C. R., Byrd, J., Carlsten, B. E., Champagne, A. E., Chattopadhyay, S., Davis, D., Downie, E. J., Durham, J. M., Feldman, G., Gao, H., Geddes, C. G. R., Griesshammer, H. W., Hajima, R., Hao, H., Hornidge, D., Isaak, J., Janssens, R. V. F., Kendellen, D. P., Kovash, M. A., Martel, P. P., Meissner, U-G, Miskimen, R., Pasquini, B., Phillips, D. R., Pietralla, N., Savran, D., Schindler, M. R., Sikora, M. H., Snow, W. M., Springer, R. P., Sun, C., Tang, C., Tiburzi, B., Tonchev, A. P., Tornow, W., Ur, C. A., Wang, D., Weller, H. R., Werner, V, Wu, Y. K., Yan, J., Zhao, Z., Zilges, A., Zomer, F., Howell, C. R., Ahmed, M. W., Afanasev, A., Alesini, D., Annand, J. R. M., Aprahamian, A., Balabanski, D. L., Benson, S., V, Bernstein, A., Brune, C. R., Byrd, J., Carlsten, B. E., Champagne, A. E., Chattopadhyay, S., Davis, D., Downie, E. J., Durham, J. M., Feldman, G., Gao, H., Geddes, C. G. R., Griesshammer, H. W., Hajima, R., Hao, H., Hornidge, D., Isaak, J., Janssens, R. V. F., Kendellen, D. P., Kovash, M. A., Martel, P. P., Meissner, U-G, Miskimen, R., Pasquini, B., Phillips, D. R., Pietralla, N., Savran, D., Schindler, M. R., Sikora, M. H., Snow, W. M., Springer, R. P., Sun, C., Tang, C., Tiburzi, B., Tonchev, A. P., Tornow, W., Ur, C. A., Wang, D., Weller, H. R., Werner, V, Wu, Y. K., Yan, J., Zhao, Z., Zilges, A., and Zomer, F.

Abstract

A workshop on The Next Generation Gamma-Ray Source sponsored by the Office of Nuclear Physics at the Department of Energy, was held November 17-19, 2016 in Bethesda, Maryland. The goals of the workshop were to identify basic and applied research opportunities at the frontiers of nuclear physics that would be made possible by the beam capabilities of an advanced laser Compton beam facility. To anchor the scientific vision to realistically achievable beam specifications using proven technologies, the workshop brought together experts in the fields of electron accelerators, lasers, and optics to examine the technical options for achieving the beam specifications required by the most compelling parts of the proposed research programs. An international assembly of participants included current and prospective gamma-ray beam users, accelerator and light-source physicists, and federal agency program managers. Sessions were organized to foster interactions between the beam users and facility developers, allowing for information sharing and mutual feedback between the two groups. The workshop findings and recommendations are summarized in this whitepaper.

Published
2022

14. International workshop on next generation gamma-ray source

Author

Howell, C R, primary, Ahmed, M W, additional, Afanasev, A, additional, Alesini, D, additional, Annand, J R M, additional, Aprahamian, A, additional, Balabanski, D L, additional, Benson, S V, additional, Bernstein, A, additional, Brune, C R, additional, Byrd, J, additional, Carlsten, B E, additional, Champagne, A E, additional, Chattopadhyay, S, additional, Davis, D, additional, Downie, E J, additional, Durham, J M, additional, Feldman, G, additional, Gao, H, additional, Geddes, C G R, additional, Grießhammer, H W, additional, Hajima, R, additional, Hao, H, additional, Hornidge, D, additional, Isaak, J, additional, Janssens, R V F, additional, Kendellen, D P, additional, Kovash, M A, additional, Martel, P P, additional, Meißner, U-G, additional, Miskimen, R, additional, Pasquini, B, additional, Phillips, D R, additional, Pietralla, N, additional, Savran, D, additional, Schindler, M R, additional, Sikora, M H, additional, Snow, W M, additional, Springer, R P, additional, Sun, C, additional, Tang, C, additional, Tiburzi, B, additional, Tonchev, A P, additional, Tornow, W, additional, Ur, C A, additional, Wang, D, additional, Weller, H R, additional, Werner, V, additional, Wu, Y K, additional, Yan, J, additional, Zhao, Z, additional, Zilges, A, additional, and Zomer, F, additional

Published
2021
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27. Conference Committees

Author

Minehara, Eisuke J., primary, Awazu, Kunio, additional, Shimoda, Koichi, additional, Awazu, K., additional, Hama, H., additional, Harami, T., additional, Imasaki, K., additional, Kimura, H., additional, Kimura, T., additional, Kuroda, H., additional, Shimoda, K., additional, Tomimasu, T., additional, Tomita, T., additional, Yamada, K., additional, Yamazaki, T., additional, Ben-Zvi, I., additional, Colson, W.B., additional, Couprie, M.-E., additional, Gover, A., additional, Kim, K.-J., additional, Li, Y., additional, Litvinenko, V.N., additional, Minehara, E.J., additional, Neil, G.R., additional, Pellegrini, C., additional, Poole, M.W., additional, Renieri, A., additional, Roberson, C.W., additional, Rossbach, J., additional, Smith, T., additional, van der Meer, A.F.G., additional, Vinokurov, N.A., additional, Walker, R., additional, Hajima, Ryoichi, additional, Kimura, Toyoaki, additional, Bakker, R., additional, Benson, S., additional, Brau, C., additional, Dai, J., additional, Dattoli, G., additional, Faatz, B., additional, Freund, H.P., additional, Galayda, J.N., additional, Ginzburg, N., additional, Glotin, F., additional, Hajima, R., additional, Hiramatsu, S., additional, Kato, R., additional, Krinsky, S., additional, Lee, B.C., additional, Lumpkin, A.H., additional, Nguyen, D., additional, Ohgaki, H., additional, Pflüger, J., additional, Reiche, S., additional, Shimizu, Y., additional, Shinn, M., additional, Shintake, T., additional, Shu, X., additional, and Xie, M., additional

Published
2004
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46. Opportunities for TeV Laser Acceleration

Author

Kando, M., primary, Kiriyama, H., additional, Koga, J.K., additional, Bulanov, S., additional, Chao, A.W., additional, Esirkepov, T., additional, Hajima, R., additional, and Tajima, T., additional

Published
2008
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