Search

Your search keyword '"Keksis, A. L."' showing total 4 results
Start Over Author "Keksis, A. L." Topic nuclear reactions
4 results on '"Keksis, A. L."'

1. Isomeric ratio measurements for the radiative neutron capture 176Lu(n,γ) at DANCE.

Author

Denis-Petit, D., Roig, O., Méot, V., Morillon, B., Romain, P., Jandel, M., Kawano, T., Vieira, D. J., Bond, E. M., Bredeweg, T. A., Couture, A. J., Haight, R. C., Keksis, A. L., Rundberg, R. S., and Ullmann, J. L.

Subjects
NEUTRON capture, LUTETIUM isotopes, METASTABLE states, NUCLEAR reactions
Abstract

The isomeric ratios for the neutron capture reaction 176Lu(n,γ) to the Jπ = 5/2-, 761.7 keV, T1/2 = 32.8 ns and the Jπ = 15/2+, 1356.9 keV, T1/2 = 11.1 ns levels of 177Lu, have been measured for the first time with the Detector for Advanced Neutron Capture Experiments (DANCE) at the Los Alamos National Laboratory. These measured isomeric ratios are compared with TALYS calculations. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

2. GAMMA EMISSION SPECTRA FROM NEUTRON RESONANCES IN 234;236;238U MEASURED USING THE DANCE DETECTOR AT LANSCE.

Author

ULLMANN, J. L., BREDEWEG, T. A., COUTURE, A. J., HAIGHT, R. C., JANDEL, M., KAWANO, T., KEKSIS, A. L., O'DONNELL, J. M., RUNDBERG, R. S., VIEIRA, D. J., WOUTERS, J. M., WILHELMY, J. B., WU, C. Y., BECKER, J. A., CHYZH, A., BARAMSAI, B., MITCHELL, G. E., and KRTICKA, M.

Subjects
NEUTRON resonance, GAMMA rays, NEUTRON capture, NUCLEAR cross sections, NUCLEOSYNTHESIS, NUCLEAR reactions, NEUTRON scattering measurement
Published
2013

3. Recent Updates to the FAUST Array.

Author

Stein, B. C., Soisson, S. N., May, L. W., Dienhoffer, R. Q., Souliotis, G. A., Shetty, D. V., Keksis, A. L., Wuenschel, S., Kohley, Z., and Yennello, S. J.

Subjects
POSITION sensitive particle detectors, SILICON diodes, PARTICLES (Nuclear physics), NUCLEAR reactions, CALIBRATION, COMPUTER software
Abstract

Current advances in technology have enabled dramatic improvements to the performance of multi-detector arrays within the last 10 years. FAUST is a forward array of 68 Si-CsI(Tl) detector telescopes that has been in use since 1996. To take full advantage of current technology, FAUST has undergone an overhaul installing new preamplifiers from Zepto Systems and modifications to allow for Dual-Axis Dual-Lateral position sensitive detectors to be installed. A new calibration software package has also been developed utilizing a novel linearization algorithm. The combination of these upgrades has led to isotopic identification for elements in the Z = 1–13 range and has greatly increased the angular resolution of the array. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

4. Quantum suppression of fluctuations and temperatures of reconstructed A ∼ 30 quasi-projectiles.

Author

Stein, B C, Bonasera, A, Souliotis, G A, Zheng, H, Cammarata, P J, Echeverria, A J, Heilborn, L, Keksis, A L, Kohley, Z, Mabiala, J, Marini, P, May, L W, McIntosh, A B, Richers, C, Shetty, D V, Soisson, S N, Tripathi, R, Wuenschel, S, and Yennello, S J

Subjects
ELECTRON gas research, INTERACTING boson-fermion models, FERMIONS, COLLISIONS (Physics), NUCLEAR reactions, NUCLEAR particle research, HEAVY ions
Abstract

Suppression of multiplicity fluctuations has been observed for three light fermions (protons, tritons and 3He) in the multifragmentation of reconstructed hot quasi-projectiles produced in collisions of 32S (45 MeV/nucleon) with 112Sn. This suppression, predicted by recent calculations, is attributed to Pauli blocking and has also been observed in experiments with trapped Fermi gases. Experimental results on nuclear temperature and density employing a quantal approach based on momentum and multiplicity fluctuations are also presented. The extracted temperatures show a noticeable reduction when compared to a similarly derived classical method. This reduction in temperature is in agreement with previous predictions indicating that classically derived methods overpredict nuclear temperature as they do not take into account the Fermi motion of the nucleons. The present results underline the role of quantum statistics in nuclear disassembly and suggest the need for proper quantum treatment when dealing with the thermodynamic properties of fragmenting heavy ions. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results