The neutron capture cross section of 197 Au was measured using the time-of-flight(TOF)technique at the Back-n facility of the China Spallation Neutron Source(CSNS)in the 1 eV to 100 keV range.Prompt c-rays originating...The neutron capture cross section of 197 Au was measured using the time-of-flight(TOF)technique at the Back-n facility of the China Spallation Neutron Source(CSNS)in the 1 eV to 100 keV range.Prompt c-rays originating from neutron-induced capture events were detected by four C_(6)D_(6) liquid scintillator detectors.Pulse height weighting technology(PHWT)was used to analyze the data.The results are in good agreement with ENDF/B-VIII.0,CENDL-3.1,and other evaluated libraries in the resonance region,and in agreement with both n TOF and GELINA experimental data in the 5–100 keV range.Finally,the resonance peaks in the energy range from 1eV to 1 keV were fitted by the SAMMY R-matrix code.展开更多
The^(74)Se is one of 35 p-nuclei,and^(82)Se is a r-process only nucleus,and their(n,γ)cross sections are vital input parameters for nuclear astrophysics reaction network calculations.The neutron capture cross section...The^(74)Se is one of 35 p-nuclei,and^(82)Se is a r-process only nucleus,and their(n,γ)cross sections are vital input parameters for nuclear astrophysics reaction network calculations.The neutron capture cross section in the resonance range of isotopes and even natural selenium samples has not been measured.Promptγ-rays originating from neutron-induced capture events were detected by four C_(6)D_(6) liquid scintillator detectors at the Back-n facility of China Spallation Neutron Source(CSNS).The pulse height weighting technique(PHWT)was used to analyze the data in the 1 e V to 100 ke V region.The deduced neutron capture cross section was compared with ENDF/B-VIII.0,JEFF-3.2,and JENDL-4.0,and some differences were found.Resonance parameters were extracted by the R-matrix code SAMMY in the 1 e V-1 ke V region.All the cross sections ofnatSe and resonance parameters are given in the datasets.The datasets are openly available at http://www.doi.org/10.11922/sciencedb.j00113.00019.展开更多
The neutron capture cross section of ^(232)Th was measured at the neutron time-of-flight facility Back-n of China Spallation Neutron Source(CSNS)for the first time.The measurement was performed with 4 hydrogen-free de...The neutron capture cross section of ^(232)Th was measured at the neutron time-of-flight facility Back-n of China Spallation Neutron Source(CSNS)for the first time.The measurement was performed with 4 hydrogen-free deuterated benzene C6D6 liquid scintillation detectors,in the ES#2 experiment station on the beam line,at a distance of about 76 m from the neutron-production assembly.The total energy detection principle in combination with the pulse height weighting technique(PHWT)was applied to analyze the measured data.Results of the ^(232)Th(n,γ)reaction cross section in the unresolved resonance region from 4 keV to 100 keV were obtained,which shows a good agreement with the existing experimental data from EXFOR,as well as with the evaluated data from the ENDF/B-VIII.0 and CENDL-3.1.In addition,the excitation function of ^(232)Th(n,γ)^(233)Th reaction in the unresolved resonance region was theoretically calculated by using the code TALYS-1.95.By fitting the experimental cross section and theoretical data,the average parameters in the unresolved resonance region were extracted.展开更多
目的探讨达格列净对2型糖尿病(T2DM)患者25-羟基维生素D_(3)[25(OH)D_(3)]、白细胞介素-6(IL-6)及肿瘤坏死因子-α(TNF-α)表达的影响。方法选取2018年7月至2020年9月在该院治疗的138例T2DM患者作为研究对象,采用前瞻性、单盲、随机对...目的探讨达格列净对2型糖尿病(T2DM)患者25-羟基维生素D_(3)[25(OH)D_(3)]、白细胞介素-6(IL-6)及肿瘤坏死因子-α(TNF-α)表达的影响。方法选取2018年7月至2020年9月在该院治疗的138例T2DM患者作为研究对象,采用前瞻性、单盲、随机对照设计原则,通过随机数字表法将患者分为观察组和对照组,各69例。对照组行常规基础治疗,包括饮食指导、运动指导、甘精胰岛素及口服降糖药物,观察组在对照组治疗基础上加用达格列净治疗(起始剂量5 mg/d,根据血糖控制情况可增加至10 mg/d)。比较两组临床疗效、血糖水平,以及血清25(OH)D_(3)、IL-6、TNF-α水平。观察两组不良反应发生情况。结果治疗后观察组总有效率明显高于对照组(91.30%vs.69.56%,P<0.05)。两组治疗后空腹血糖(FPG)、2 h餐后血糖(2 h PBG)、糖化血红蛋白(HbA1c)、血清IL-6及TNF-α水平均较治疗前明显降低(P<0.05),且观察组治疗后FPG、2 h PBG、HbA1c、血清IL-6及TNF-α水平均明显低于对照组(P<0.05)。两组治疗后血清25(OH)D_(3)水平均较治疗前明显升高(P<0.05),且观察组治疗后血清25(OH)D_(3)水平明显高于对照组(P<0.05)。观察组总不良反应发生率与对照组无明显差异(15.94%vs.11.59%,P>0.05)。结论在常规治疗基础上加用达格列净可降低T2DM患者血糖水平,调节血清25(OH)D_(3)、IL-6及TNF-α水平,改善临床疗效,且不增加不良反应的发生。展开更多
基金supported by the National Natural Science Foundation of China(Nos.11875311,11905274,11705156,and 11605097)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB34030000)。
文摘The neutron capture cross section of 197 Au was measured using the time-of-flight(TOF)technique at the Back-n facility of the China Spallation Neutron Source(CSNS)in the 1 eV to 100 keV range.Prompt c-rays originating from neutron-induced capture events were detected by four C_(6)D_(6) liquid scintillator detectors.Pulse height weighting technology(PHWT)was used to analyze the data.The results are in good agreement with ENDF/B-VIII.0,CENDL-3.1,and other evaluated libraries in the resonance region,and in agreement with both n TOF and GELINA experimental data in the 5–100 keV range.Finally,the resonance peaks in the energy range from 1eV to 1 keV were fitted by the SAMMY R-matrix code.
基金supported by the National Natural Science Foundation of China(Grant Nos.11875311,11905274,11705156,11605097,and U2032146)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB34030000)。
文摘The^(74)Se is one of 35 p-nuclei,and^(82)Se is a r-process only nucleus,and their(n,γ)cross sections are vital input parameters for nuclear astrophysics reaction network calculations.The neutron capture cross section in the resonance range of isotopes and even natural selenium samples has not been measured.Promptγ-rays originating from neutron-induced capture events were detected by four C_(6)D_(6) liquid scintillator detectors at the Back-n facility of China Spallation Neutron Source(CSNS).The pulse height weighting technique(PHWT)was used to analyze the data in the 1 e V to 100 ke V region.The deduced neutron capture cross section was compared with ENDF/B-VIII.0,JEFF-3.2,and JENDL-4.0,and some differences were found.Resonance parameters were extracted by the R-matrix code SAMMY in the 1 e V-1 ke V region.All the cross sections ofnatSe and resonance parameters are given in the datasets.The datasets are openly available at http://www.doi.org/10.11922/sciencedb.j00113.00019.
基金supported by the Chinese TMSR Strategic Pioneer Science and Technology Project(Grant No.XDA02010000)the National Natural Science Foundation of China(Grant No.11790321).
文摘The neutron capture cross section of ^(232)Th was measured at the neutron time-of-flight facility Back-n of China Spallation Neutron Source(CSNS)for the first time.The measurement was performed with 4 hydrogen-free deuterated benzene C6D6 liquid scintillation detectors,in the ES#2 experiment station on the beam line,at a distance of about 76 m from the neutron-production assembly.The total energy detection principle in combination with the pulse height weighting technique(PHWT)was applied to analyze the measured data.Results of the ^(232)Th(n,γ)reaction cross section in the unresolved resonance region from 4 keV to 100 keV were obtained,which shows a good agreement with the existing experimental data from EXFOR,as well as with the evaluated data from the ENDF/B-VIII.0 and CENDL-3.1.In addition,the excitation function of ^(232)Th(n,γ)^(233)Th reaction in the unresolved resonance region was theoretically calculated by using the code TALYS-1.95.By fitting the experimental cross section and theoretical data,the average parameters in the unresolved resonance region were extracted.
文摘目的探讨达格列净对2型糖尿病(T2DM)患者25-羟基维生素D_(3)[25(OH)D_(3)]、白细胞介素-6(IL-6)及肿瘤坏死因子-α(TNF-α)表达的影响。方法选取2018年7月至2020年9月在该院治疗的138例T2DM患者作为研究对象,采用前瞻性、单盲、随机对照设计原则,通过随机数字表法将患者分为观察组和对照组,各69例。对照组行常规基础治疗,包括饮食指导、运动指导、甘精胰岛素及口服降糖药物,观察组在对照组治疗基础上加用达格列净治疗(起始剂量5 mg/d,根据血糖控制情况可增加至10 mg/d)。比较两组临床疗效、血糖水平,以及血清25(OH)D_(3)、IL-6、TNF-α水平。观察两组不良反应发生情况。结果治疗后观察组总有效率明显高于对照组(91.30%vs.69.56%,P<0.05)。两组治疗后空腹血糖(FPG)、2 h餐后血糖(2 h PBG)、糖化血红蛋白(HbA1c)、血清IL-6及TNF-α水平均较治疗前明显降低(P<0.05),且观察组治疗后FPG、2 h PBG、HbA1c、血清IL-6及TNF-α水平均明显低于对照组(P<0.05)。两组治疗后血清25(OH)D_(3)水平均较治疗前明显升高(P<0.05),且观察组治疗后血清25(OH)D_(3)水平明显高于对照组(P<0.05)。观察组总不良反应发生率与对照组无明显差异(15.94%vs.11.59%,P>0.05)。结论在常规治疗基础上加用达格列净可降低T2DM患者血糖水平,调节血清25(OH)D_(3)、IL-6及TNF-α水平,改善临床疗效,且不增加不良反应的发生。
