Zobrazeno 1 - 10
of 283
pro vyhledávání: '"Callahan, A. B."'
Autor:
Cude-Woods, C., Gonzalez, F. M., Fries, E. M., Bailey, T., Blatnik, M., Callahan, N. B., Choi, J. H., Clayton, S. M., Currie, S. A., Dawid, M., Filippone, B. W., Fox, W., Geltenbort, P., George, E., Hayen, L., Hickerson, K. P., Hoffbauer, M. A., Hoffman, K., Holley, A. T., Ito, T. M., Komives, A., Liu, C. -Y., Makela, M., Morris, C. L., Musedinovic, R., O'Shaughnessy, C., Pattie, Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Sharapov, 5 E. I., Slutsky, S., Su, V., Sun, X., Swank, C., Tang, Z., Uhrich, W., Vanderwerp, J., Walstrom, P., Wang, Z., Wei, W., Young, A. R.
The past two decades have yielded several new measurements and reanalyses of older measurements of the neutron lifetime. These have led to a 4.4 standard deviation discrepancy between the most precise measurements of the neutron decay rate producing
Externí odkaz:
http://arxiv.org/abs/2205.02323
Autor:
Gonzalez, F. M., Fries, E. M., Cude-Woods, C., Bailey, T., Blatnik, M., Broussard, L. J., Callahan, N. B., Choi, J. H., Clayton, S. M., Currie, S. A., Dawid, M., Dees, E. B., Filippone, B. W., Fox, W., Geltenbort, P., George, E., Hayen, L., Hickerson, K. P., Hoffbauer, M. A., Hoffman, K., Holley, A. T., Ito, T. M., Komives, A., Liu, C. -Y., Makela, M., Morris, C. L., Musedinovic, R., O'Shaughnessy, C., Pattie, Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Sharapov, E. I., Slutsky, S., Su, V., Sun, X., Swank, C., Tang, Z., Uhrich, W., Vanderwerp, J., Walstrom, P., Wang, Z., Wei, W., Young, A. R.
We report an improved measurement of the free neutron lifetime $\tau_{n}$ using the UCN$\tau$ apparatus at the Los Alamos Neutron Science Center. We counted a total of approximately $38\times10^{6}$ surviving ultracold neutrons (UCN) after storing in
Externí odkaz:
http://arxiv.org/abs/2106.10375
Autor:
Kuk, K., Cude-Woods, C., Chavez, C. R., Choi, J. H., Estrada, J., Hoffbauer, M., Makela, M., Merkel, P., Morris, C. L., Ramberg, E., Wang, Z., Bailey, T., Blatnik, M., Adamek, E. R., Broussard, L. J., Brown, M. A. -P., Callahan, N. B., Clayton, S. M., Currie, S. A., Ding, X., Dinger, D., Filippone, B., Fries, E. M., Geltenbort, P., George, E., Gonzalez, F., Hickerson, K. P., Hoffman, K., Holley, A. T., Ito, T. M., MacDonald, S. W. T., Liu, C. -Y., O'Shaughnessy, C., Pattie, Jr., R. W., Phillips II, D. G., Plaster, B., Salvat, D. J., Saunders, A., Seestrom, S., Sharapov, E. I., Sjue, S. K. L., Su, V., Sun, X., Tang, Z., Walstrom, P. L., Wei, W., Wexler, J. W., Womack, T. L., Young, A. R., Zeck, B. A., collaboration, UCN
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A, Volume 1003, 1 July 2021, 165306
A new boron-coated CCD camera is described for direct detection of ultracold neutrons (UCN) through the capture reactions $^{10}$B (n,$\alpha$0$\gamma$)$^7$Li (6%) and $^{10}$B(n,$\alpha$1$\gamma$)$^7$Li (94%). The experiments, which extend earlier w
Externí odkaz:
http://arxiv.org/abs/1903.01335
Akademický článek
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Autor:
Ito, T. M., Adamek, E. R., Callahan, N. B., Choi, J. H., Clayton, S. M., Cude-Woods, C., Currie, S., Ding, X., Fellers, D. E., Geltenbort, P., Lamoreaux, S. K., Liu, C. Y., MacDonald, S., Makela, M., Morris, C. L., Pattie Jr., R. W., Ramsey, J. C., Salvat, D. J., Saunders, A., Sharapov, E. I., Sjue, S., Sprow, A. P., Tang, Z., Weaver, H. L., Wei, W., Young, A. R.
Publikováno v:
Phys. Rev. C 97, 012501 (2018)
The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various
Externí odkaz:
http://arxiv.org/abs/1710.05182
Autor:
Pattie Jr., R. W., Callahan, N. B., Cude-Woods, C., Adamek, E. R., Broussard, L. J., Clayton, S. M., Currie, S. A., Dees, E. B., Ding, X., Engel, E. M., Fellers, D. E., Fox, W., Hickerson, K. P., Hoffbauer, M. A., Holley, A. T., Komives, A., Liu, C. -Y., MacDonald, S. W. T., Makela, M., Morris, C. L., Ortiz, J. D., Ramsey, J., Salvat, D. J., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sjue, S. K., Tang, Z., Vanderwerp, J., Vogelaar, B., Walstrom, P. L., Wang, Z., Wei, W., Weaver, H. L., Wexler, J. W., Womack, T. L., Young, A. R., Zeck, B. A.
The precise value of the mean neutron lifetime, $\tau_n$, plays an important role in nuclear and particle physics and cosmology. It is a key input for predicting the ratio of protons to helium atoms in the primordial universe and is used to search fo
Externí odkaz:
http://arxiv.org/abs/1707.01817
Autor:
Pattie Jr, R. W., Adamek, E., Brenner, T., Brandt, A., Broussard, L. J., Callahan, N. B., Clayton, S. M., Cude-Woods, C., Currie, S. A., Geltonbort, P., Ito, T., Lauer, T., Liu, C. Y., Majewski, J., Makela, M., Masuda, Y., Morris, C. L., Ramsey, J. C., Salvat, D., Saunders, A., Schroffenegger, J., Tang, Z., Wei, W., Wang, Z., Watkins, E., Young, A. R., Zeck, B. A.
We report on the evaluation of commercial electroless nickel phosphorus (NiP) coatings for ultracold neutron (UCN) transport and storage. The material potential of 50~$\mu$m thick NiP coatings on stainless steel and aluminum substrates was measured t
Externí odkaz:
http://arxiv.org/abs/1703.00508
Autor:
Morris, C. L., Adamek, E. R., Broussard, L. J., Callahan, N. B., Clayton, S. M., Cude-Woods, C., Currie, S. A., Ding, X., Fox, W., Hickerson, K. P., Holley, A. T., Komives, A., Liu, C. -Y., Makela, M., Pattie Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sjue, S. K., Tang, Z., Vanderwerp, J., Vogelaar, B., Walstrom, P. L., Wang, Z., Wei, Wanchun, Wexler, J. W., Womack, T. L., Young, A. R., Zeck, B. A.
The neutron lifetime is important in understanding the production of light nuclei in the first minutes after the big bang and it provides basic information on the charged weak current of the standard model of particle physics. Two different methods h
Externí odkaz:
http://arxiv.org/abs/1610.04560
Autor:
Broussard, L. J., Zeck, B. A., Adamek, E. R., Baeßler, S., Birge, N., Blatnik, M., Bowman, J. D., Brandt, A. E., Brown, M., Burkhart, J., Callahan, N. B., Clayton, S. M., Crawford, C., Cude-Woods, C., Currie, S., Dees, E. B., Ding, X., Fomin, N., Frlez, E., Fry, J., Gray, F. E., Hasan, S., Hickerson, K. P., Hoagland, J., Holley, A. T., Ito, T. M., Klein, A., Li, H., Liu, C. -Y., Makela, M. F., McGaughey, P. L., Mirabal-Martinez, J., Morris, C. L., Ortiz, J. D., Pattie Jr., R. W., Penttilä, S. I., Plaster, B., Počanić, D., Ramsey, J. C., Salas-Bacci, A., Salvat, D. J., Saunders, A., Seestrom, S. J., Sjue, S. K. L., Sprow, A. P., Tang, Z., Vogelaar, R. B., Vorndick, B., Wang, Z., Wei, W., Wexler, J., Wilburn, W. S., Womack, T. L., Young, A. R.
We describe a detection system designed for precise measurements of angular correlations in neutron $\beta$ decay. The system is based on thick, large area, highly segmented silicon detectors developed in collaboration with Micron Semiconductor, Ltd.
Externí odkaz:
http://arxiv.org/abs/1607.02656
Autor:
Wei, Wanchun, Broussard, L. J., Hoffbauer, M. A., Makela, M., Morris, C. L., Tang, Z., Adamek, E. R., Callahan, N. B., Clayton, S. M., Cude-Woods, C., Currie, S., Dees, E. B., Ding, X., Geltenbort, P., Hickerson, K. P., Holley, A. T., Ito, T. M., Leung, K. K., Liu, C. -Y., Morley, D. J., Ortiz, Jose D., Pattie, Jr., R. W., Ramsey, J. C., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sjue, S. K., Wexler, J., Womack, T. L., Young, A. R., Zeck, B. A., Wang, Zhehui
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A, vol. 830, 36-43 (2016)
Position-sensitive detection of ultracold neutrons (UCNs) is demonstrated using an imaging charge-coupled device (CCD) camera. A spatial resolution less than 15 $\mu$m has been achieved, which is equivalent to an UCN energy resolution below 2 pico-el
Externí odkaz:
http://arxiv.org/abs/1604.08292