Zobrazeno 1 - 10
of 249
pro vyhledávání: '"Ullmann, J. L."'
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Radiative neutron capture is an important nuclear reaction whose accurate description is needed for many applications ranging from nuclear technology to nuclear astrophysics. The description of such a process relies on the Hauser-Feshbach theory whic
Externí odkaz:
http://arxiv.org/abs/1706.07504
Autor:
Weigand, M., Bredeweg, T. A., Couture, A., Göbel, K., Heftrich, T., Jandel, M., Käppeler, F., Lederer, C., Kivel, N., Korschinek, G., Krticka, M., O'Donnell, J. M., Ostermöller, J., Plag, R., Reifarth, R., Schumann, D., Ullmann, J. L., Wallner, A.
Publikováno v:
Physical Review C 92, 045810 (2015)
The neutron capture cross section of the s-process branch nucleus $^{63}$Ni affects the abundances of other nuclei in its region, especially $^{63}$Cu and $^{64}$Zn. In order to determine the energy dependent neutron capture cross section in the astr
Externí odkaz:
http://arxiv.org/abs/1512.02263
Autor:
Heil, M., Reifarth, R., Fowler, M. M., Haight, R. C., Käppeler, F., Rundberg, R. S., Seabury, E. H., Ullmann, J. L., Wilhelmy, J. B., Wisshak, K.
Publikováno v:
Nuclear Instruments and Methods in Physics Research A 459 (2001) 229}246
The quest for improved neutron capture cross sections for advanced reactor concepts, transmutation of radioactive wastes as well as for astrophysical scenarios of neutron capture nucleosynthesis has motivated new experimental efforts based on modern
Externí odkaz:
http://arxiv.org/abs/1310.4487
Autor:
Reifarth, R., Bredeweg, T. A., Alpizar-Vicente, A., Browne, J. C., Esch, E. -I., Greife, U., Haight, R. C., Hatarik, R., Kronenberg, A., O'Donnell, J. M., Rundberg, R. S., Ullmann, J. L., Vieira, D. J., Wilhelmy, J. B., Wouters, J. M.
Publikováno v:
Nuclear Instruments and Methods in Physics Research A 531 (2004) 530-543
In the commissioning phase of the DANCE project (Detector for Advanced Neutron Capture Experiments) measurements have been performed with special emphasis on the identification and suppression of possible backgrounds for the planned (n,g) experiments
Externí odkaz:
http://arxiv.org/abs/1310.1884
Autor:
Engle, J. W., Mashnik, S. G., Bach, H., Couture, A., Jackman, K., Gritzo, R., Ballard, B. D., Faßbender, M., Smith, D. M., Bitteker, L. J., Ullmann, J. L., Gulley, M., Pillai, C., John, K. D., Birnbaum, E. R., Nortier, F. M.
Publikováno v:
Nuclear Physics A, 893, 87-100 (2012)
A single terbium foil was irradiated with 800 MeV protons to ascertain the potential for production of lanthanide isotopes of interest in medical, astrophysical, and basic science research and to contribute to nuclear data repositories. Isotopes prod
Externí odkaz:
http://arxiv.org/abs/1207.1486
Autor:
Weidner, J. W., Mashnik, S. G., John, K. D., Hemez, F., Ballard, B., Bach, H., Birnbaum, E. R., Bitteker, L. J., Couture, A., Dry, D., Fassbender, M. E., Gulley, M. S., Jackman, K. R., Ullmann, J. L., Wolfsberg, L. E., Nortier, F. M.
Cross sections for 223,225Ra, 225Ac and 227Th production by the proton bombardment of natural thorium targets were measured at proton energies below 200 MeV. Our measurements are in good agreement with previously published data and offer a complete e
Externí odkaz:
http://arxiv.org/abs/1205.3523
Autor:
Weidner, J. W., Mashnik, S. G., John, K. D., Ballard, B., Birnbaum, E. R., Bitteker, L. J., Couture, A., Fassbender, M. E., Goff, G. S., Gritzo, R., Hemez, F. M., Runde, W., Ullmann, J. L., Wolfsberg, L. E., Nortier, F. M.
Cross sections for the formation of 225,227-Ac, 223,225-Ra, and 227-Th via the proton bombardment of natural thorium targets were measured at a nominal proton energy of 800 MeV. No earlier experimental cross section data for the production of 223,225
Externí odkaz:
http://arxiv.org/abs/1204.2299
Almost since the time it was formulated, the overwhelming consensus has been that random matrix theory (RMT) is in excellent agreement with neutron resonance data. However, over the past few years, we have obtained new neutron-width data at Oak Ridge
Externí odkaz:
http://arxiv.org/abs/1204.0693
Autor:
Koehler, P. E., Reifarth, R., Ullmann, J. L., Bredeweg, T. A., O'Donnell, J. M., Rundberg, R. S., Vieira, D. J., Wouters, J. M.
We obtained total radiation widths of s-wave resonances through R-matrix analysis of 147Sm(n,gamma) cross-sections. Distributions of these widths differ markedly for resonances below and above 300 eV, in stark contrast to long-established theory. We
Externí odkaz:
http://arxiv.org/abs/1202.0244