System size effects on probing nuclear dissipation with neutrons

WU Feng; YE Wei

doi:10.1088/1674-1137/34/5/007

Chinese Physics C> 2010, Vol. 34> Issue(5) : 551-554 DOI: 10.1088/1674-1137/34/5/007

System size effects on probing nuclear dissipation with neutrons

WU Feng ,
YE Wei ^,

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Abstract：
Using a dynamical Langevin equation coupled with a statistical decay model, we calculate the excess of the pre-scission neutron multiplicities over its standard statistical-model values as a function of the nuclear dissipation strength for the three nuclei ¹⁹⁰Os, ²⁰⁰Hg, and ²¹⁰Po which have the same neutron-to-proton ratio N/Z. We find that by decreasing the size of the fissioning nuclei, the effects of nuclear dissipation on the excess of the pre-scission neutron multiplicity are substantially amplified, and that the sensitivity of this excess to the nuclear friction strength is considerably increased as well. We suggest that for those fissioning systems with the same N/Z that are populated in fusion reactions, to obtain a more accurate information of the nuclear dissipation strength by measuring the pre-scission neutron multiplicity, it is best to choose a system with a small size.

References

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WU Feng and YE Wei. System size effects on probing nuclear dissipation with neutrons[J]. Chinese Physics C, 2010, 34(5): 551-554. doi: 10.1088/1674-1137/34/5/007

WU Feng and YE Wei. System size effects on probing nuclear dissipation with neutrons[J]. Chinese Physics C, 2010, 34(5): 551-554. doi: 10.1088/1674-1137/34/5/007 shu

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Received: 2009-07-20
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

System size effects on probing nuclear dissipation with neutrons

Corresponding author: YE Wei,

Received Date: 2009-07-20

Accepted Date: 2009-10-24

Available Online: 2010-05-05

Abstract:

Using a dynamical Langevin equation coupled with a statistical decay model, we calculate the excess of the pre-scission neutron multiplicities over its standard statistical-model values as a function of the nuclear dissipation strength for the three nuclei ¹⁹⁰Os, ²⁰⁰Hg, and ²¹⁰Po which have the same neutron-to-proton ratio N/Z. We find that by decreasing the size of the fissioning nuclei, the effects of nuclear dissipation on the excess of the pre-scission neutron multiplicity are substantially amplified, and that the sensitivity of this excess to the nuclear friction strength is considerably increased as well. We suggest that for those fissioning systems with the same N/Z that are populated in fusion reactions, to obtain a more accurate information of the nuclear dissipation strength by measuring the pre-scission neutron multiplicity, it is best to choose a system with a small size.

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System size effects on probing nuclear dissipation with neutrons

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