Measurement of giant dipole resonance width at low temperature: A new experimental perspective
Measurement of giant dipole resonance width at low temperature: A new experimental perspective
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低温巨偶极子共振宽度测量：新的实验视角
DOI：
10.1016/j.physletb.2012.01.059
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发表时间：
2011
影响因子：
4.4
通讯作者：
S. Banerjee
中科院分区：
文献类型：
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作者：
S. Mukhopadhyay;D. Pandit;S. Pal;S. Bhattacharya;A. De;S. Bhattacharya;C. Bhattacharya;K. Banerjee;S. Kundu;T. Rana;G. Mukherjee;R. Pandey;M. Gohil;H. Pai;J. K. Meena;S. Banerjee
利用α诱导聚变反应和LAMBDA高能光子谱仪，测量了~（119）Sb在0.9- 1.4MeV温区巨偶极共振（GDR）宽度的系统演化。通过同时从中子蒸发谱中提取生命能级密度参数和从γ多重性滤波器中提取角动量，精确地确定了温度。数据的系统趋势似乎与热形状起伏模型（TSFM）不一致。该模型预测的GDR宽度从其基态值逐渐增加，而测量的GDR宽度似乎保持恒定的基态值，直到T ≈ 1 MeV，并增加之后，向失败的绝热假设的模型在低温下。
The systematic evolution of the giant dipole resonance (GDR) width in the temperature region of 0.9–1.4 MeV has been measured experimentally for119Sb using alpha induced fusion reaction and employing the LAMBDA high energy photon spectrometer. The temperatures have been precisely determined by simultaneously extracting the vital level density parameter from the neutron evaporation spectrum and the angular momentum from gamma multiplicity filter using a realistic approach. The systematic trend of the data seems to disagree with the thermal shape fluctuation model (TSFM). The model predicts the gradual increase of GDR width from its ground state value whereas the measured GDR widths appear to remain constant at the ground state value till T∼1 MeV and increase thereafter, indicating towards a failure of the adiabatic assumption of the model at low temperature.
DOI：
--
发表时间：
2003
期刊：
Phys. Lett. B 555
影响因子：
--
作者：
P.Heckman et al.
通讯作者：
P.Heckman et al.