<p>Systematic disagreements exist mainly in the available partial photoneutron cross sections <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\sigma\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>σ</mi> </math></EquationSource> </InlineEquation><InlineEquation ID="IEq4"> <EquationSource Format="TEX">\((\gamma , i\text{nX})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>γ</mi> <mo>,</mo> <mi>i</mi> <mtext>nX</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>&#xa0;(<i>i</i>=1, 2), which were measured using quasimonoenergetic annihilation photons at the Saclay (France) and Livermore (USA) laboratories based on neutron multiplicity sorting methods. In this study, the reliability of the <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\sigma\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>σ</mi> </math></EquationSource> </InlineEquation><InlineEquation ID="IEq6"> <EquationSource Format="TEX">\((\gamma , i\text{nX})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>γ</mi> <mo>,</mo> <mi>i</mi> <mtext>nX</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> for <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(^{142-146, 148, 150}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mrow> <mn>142</mn> <mo>-</mo> <mn>146</mn> <mo>,</mo> <mn>148</mn> <mo>,</mo> <mn>150</mn> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation>Nd isotopes obtained at Saclay was evaluated using an experimental–theoretical method that satisfies the data reliability criteria proposed based on the theoretical model in TALYS. Our evaluations were then compared with the major Evaluated Nuclear Data Libraries, and the differences from the available experimental data were analyzed. It was found that the <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\sigma (\gamma , 1\text{nX})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>σ</mi> <mo stretchy="false">(</mo> <mi>γ</mi> <mo>,</mo> <mn>1</mn> <mtext>nX</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> data of Saclay were overestimated and the <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\sigma (\gamma , 2\text{nX})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>σ</mi> <mo stretchy="false">(</mo> <mi>γ</mi> <mo>,</mo> <mn>2</mn> <mtext>nX</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> data were underestimated in the <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(^{144-146, 148, 150}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mrow> <mn>144</mn> <mo>-</mo> <mn>146</mn> <mo>,</mo> <mn>148</mn> <mo>,</mo> <mn>150</mn> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation>Nd cases, which is consistent with the conclusion of Varlamov; on the contrary, the <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(\sigma (\gamma , 1\text{nX})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>σ</mi> <mo stretchy="false">(</mo> <mi>γ</mi> <mo>,</mo> <mn>1</mn> <mtext>nX</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> were underestimated and the <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(\sigma (\gamma , 2\text{nX})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>σ</mi> <mo stretchy="false">(</mo> <mi>γ</mi> <mo>,</mo> <mn>2</mn> <mtext>nX</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> were overestimated in the <InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(^{142, 143}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mrow> <mn>142</mn> <mo>,</mo> <mn>143</mn> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation>Nd cases. Possible reasons for the above inconsistency in the Nd isotopes were further analyzed. Interestingly, subtracting the contribution of isotopic target impurities significantly reduced the discrepancy in the <InlineEquation ID="IEq14"> <EquationSource Format="TEX">\(^{143}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>143</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>Nd case. However, this is no longer applicable to the <InlineEquation ID="IEq15"> <EquationSource Format="TEX">\(^{142}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>142</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>Nd case, and other factors, including the detector efficiency and accidental coincidence events, should be fully considered to resolve such discrepancies.</p>

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Reliability evaluation on partial photoneutron cross sections for \(^{142-146, 148, 150}\)Nd

  • Yu-Long Shen,
  • Zhi-Cai Li,
  • Ting-Kai Ma,
  • Wen-Yu Tan,
  • Ting Wu,
  • Xin-Xiang Li,
  • Ji-Min Wang,
  • Xi Tao,
  • Gong-Tao Fan,
  • Rui-Rui Xu,
  • Wen Luo

摘要

Systematic disagreements exist mainly in the available partial photoneutron cross sections \(\sigma\) σ \((\gamma , i\text{nX})\) ( γ , i nX )  (i=1, 2), which were measured using quasimonoenergetic annihilation photons at the Saclay (France) and Livermore (USA) laboratories based on neutron multiplicity sorting methods. In this study, the reliability of the \(\sigma\) σ \((\gamma , i\text{nX})\) ( γ , i nX ) for \(^{142-146, 148, 150}\) 142 - 146 , 148 , 150 Nd isotopes obtained at Saclay was evaluated using an experimental–theoretical method that satisfies the data reliability criteria proposed based on the theoretical model in TALYS. Our evaluations were then compared with the major Evaluated Nuclear Data Libraries, and the differences from the available experimental data were analyzed. It was found that the \(\sigma (\gamma , 1\text{nX})\) σ ( γ , 1 nX ) data of Saclay were overestimated and the \(\sigma (\gamma , 2\text{nX})\) σ ( γ , 2 nX ) data were underestimated in the \(^{144-146, 148, 150}\) 144 - 146 , 148 , 150 Nd cases, which is consistent with the conclusion of Varlamov; on the contrary, the \(\sigma (\gamma , 1\text{nX})\) σ ( γ , 1 nX ) were underestimated and the \(\sigma (\gamma , 2\text{nX})\) σ ( γ , 2 nX ) were overestimated in the \(^{142, 143}\) 142 , 143 Nd cases. Possible reasons for the above inconsistency in the Nd isotopes were further analyzed. Interestingly, subtracting the contribution of isotopic target impurities significantly reduced the discrepancy in the \(^{143}\) 143 Nd case. However, this is no longer applicable to the \(^{142}\) 142 Nd case, and other factors, including the detector efficiency and accidental coincidence events, should be fully considered to resolve such discrepancies.