Nuclear resonance fluorescence excitations near 2 MeV in 235U and 239Pu

被引：84

作者：

Bertozzi, W. ^{[1
]}

Caggiano, J. A. ^{[2
]}

Hensley, W. K. ^{[2
]}

Johnson, M. S. ^{[3
]}

Korbly, S. E. ^{[1
]}

Ledoux, R. J. ^{[1
]}

McNabb, D. P. ^{[3
]}

Norman, E. B. ^{[3
]}

Park, W. H. ^{[1
]}

Warren, G. A. ^{[2
]}

机构：

[1] Passport Syst Inc, Acton, MA 01720 USA

[2] Pacific NW Natl Lab, Richland, WA 99352 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW C | 2008年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevC.78.041601

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A search for nuclear resonance fluorescence excitations in U-235 and Pu-239 within the energy range of 1.0- to 2.5-MeV was performed using a 4-MeV continuous bremsstrahlung source at the High Voltage Research Laboratory at the Massachusetts Institute of Technology. Measurements utilizing high purity Ge detectors at backward angles identified nine photopeaks in U-235 and 12 photopeaks in Pu-239 in this energy range. These resonances provide unique signatures that allow the materials to be nonintrusively detected in a variety of environments including fuel cells, waste drums, vehicles, and containers. The presence and properties of these states may prove useful in understanding the mechanisms for mixing low-lying collective dipole excitations with other states at low excitations in heavy nuclei.

引用

页数：5

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