Measurement of Capture Cross-Sections for the 165Ho (n,$\gamma$)166Ho Reaction in the Neutron Energy Region from 10 to 90 keV

Yeong-Rok Kang,Guinyun Kim,Toshiro Ohsaki,Hyun Kim,Masayuki Igashira,이삼열,Tae-Ik Ro,Won-Chumg Chung 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I

The neutron capture cross-sections of $^{165}$Ho were measured in the energy region from 10 to 90 keV. Pulsed keV-neutrons were produced via the $^{7}$Li(p,n)$^{7}$Be reaction by bombarding the lithium target with a 1.5-ns bunched proton beam from the 3-MV Pelletron accelerator of the Tokyo Institute of Technology. The neutron energy, having a continuous spectrum, was measured by using a time-of-flight method and a $^{6}$Li-glass scintillation detector. The gamma-rays emitted from the reaction were detected by using an anti-Compton NaI(Tl) spectrometer. A pulse-height weighting technique was applied to observe the capture gamma-ray pulse-height spectra to derive the capture yields. The neutron capture cross-sections were determined relative to the standard capture cross-sections of $^{197}$Au. The present results were compared with previous measurements and with the evaluated values of ENDF/B-VII-b2 and JEF-3.1

Measurement of the keV-Neutron Capture Cross-Sections and Capture Γ-Ray Spectra of 155Gd and 157Gd

정원정,김규연,Masayuki Igashira,이삼열,노태익,Toshiro Ohsaki 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.2

The neutron capture cross-sections and the capture $\gamma$-ray spectra of $^{155}$Gd and $^{157}$Gd were measured at the 3-MeV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology in the energy range from 10 to 550 keV. Pulsed keV-neutrons were produced from the $^7$Li(p,n)$^7$Be reaction by bombarding the lithium target with the 1.5-ns bunched proton beam from the Pelletron accelerator. The spectrum for the neutrons incident on a capture sample was measured by means of a time-of-flight method with a $^6$Li-glass detector. Capture $\gamma$-rays were detected with a large anti-Compton NaI(Tl) spectrometer by employing a time-of-flight method. A pulse-height weighting technique was applied to the observed capture $\gamma$-ray pulse-height spectra to derive the capture yields. The neutron capture cross-sections were determined relative to the standard capture cross-section of $^{197}$Au. The results were compared to other measurements and the evaluated values. The capture $\gamma$-ray spectra were obtained by unfolding the observed capture $\gamma$-ray pulse-height spectra.

Measurement of the keV-Neutron Capture Cross-Sections of 156,158Gd

Won-Chung Chung,Guinyun Kim,Masayuki Igashira,Tae-Ik Ro,Toshiro Ohsaki 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I

The neutron capture cross-sections of $^{156}$Gd and $^{158}$Gd were measured in the neutron energy region from 10 to 90 keV by using the 3-MV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. Pulsed keV-neutrons were produced from the $^7$Li(p,n)$^7$Be reaction by bombarding the lithium target with a 1.5-ns bunched proton beam. The incident neutron spectrum on the capture sample was measured by means of a time-of-flight (TOF) method with a $^6$Li-glass detector. The capture $\gamma$-rays were detected with a large anti-Compton NaI(Tl) spectrometer. A pulse-height weighting technique was applied to the measured capture $\gamma$-ray pulse-height spectra to derive the capture yields. The capture cross-sections were obtained by using the standard capture cross-section of $^{197}$Au. The present results were compared with the previous measurements and with the evaluated values of ENDF/B-VII-b2 and JENDL-3.3.

Measurement of Neutron Capture Cross-Sections and Capture ggamma-ray Spectra of {161,162,163,164}^Dy at 550 keV

김현덕,김귀년,Jung Keun Ahn,Masayuki Igashira,Satoshi Mizuno,Tae-Ik Ro,Toshiro Ohsaki,Won-Chung Chung 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3

The neutron capture cross-sections and capture-ray spectra of 161;162;163;164Dy were measuredat a neutron energy of 550 keV by using the 3-MV Pelletron accelerator of the Research Laboratoryfor Nuclear Reactors at the Tokyo Institute of Technology. A neutron time-of-ight method wasadopted with a 1.5-ns pulsed neutron source using the 7Li(p,n)7Be reaction, and a large anti-Compton NaI(Tl)-ray spectrometer was used. A pulse-height weighting technique was applied tothe observed capture-ray pulse-height spectra to derive the capture yields. The measured capturecross-sections were 0.221 0.016, 0.110 0.007, 0.119 0.008, and 0.037 0.005 (barn) for 161Dy,162Dy, 163Dy, and 164Dy, respectively. The present results were in good agreement with previousmeasurements. However, the evaluated values of ENDF/B-VI for 162;164Dy were more than threetimes higher than our measurements. The capture-ray spectra were obtained by unfolding theobserved capture-ray pulse-height spectra. The neutron capture cross-sections and capture -ray spectra of 161;162;163;164Dy were measured at a neutron energy of 550 keV by using the 3-MV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. A neutron time-of- ight method was adopted with a 1.5-ns pulsed neutron source using the 7Li(p,n)7Be reaction, and a large anti- Compton NaI(Tl) -ray spectrometer was used. A pulse-height weighting technique was applied to the observed capture -ray pulse-height spectra to derive the capture yields. The measured capture cross-sections were 0.221 0.016, 0.110 0.007, 0.119 0.008, and 0.037 0.005 (barn) for 161Dy, 162Dy, 163Dy, and 164Dy, respectively. The present results were in good agreement with previous measurements. However, the evaluated values of ENDF/B-VI for 162;164Dy were more than three times higher than our measurements. The capture -ray spectra were obtained by unfolding the observed capture -ray pulse-height spectra.

Measurement of Neutron Capture Cross-Sections for 155Gd and 157Gd Isotopes in the Neutron Energy Range from 10 to 90 keV

Won-Chung Chung,Tae-Ik Ro,Guinyun Kim,Masayuki Igashira,Toshiro Ohsaki 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4

The neutron capture cross-section of 155Gd and 157Gd have been measured in the neutron energy range from 10 to 90 keV by using the 3-MV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. Pulsed keV neutrons were produced from the 7Li(p,n)7Be reaction by bombarding the lithium target with the 1.5-ns bunched proton beam from the Pelletron accelerator. The incident neutron spectrum on a capture sample was measured by means of a TOF method with a 6Li-glass detector. Capture -rays were detected with a large anti- Compton NaI(Tl) spectrometer by employing a TOF method. A pulse-height weighting technique was applied to observed the capture -ray pulse-height spectra to derive capture yields. The capture cross-section were obtained by using the standard capture cross-section of 197Au. The present results were compared with previous measurements and with the evaluated values of ENDF/B-VI.

Measurement of Neutron Capture Cross-Sections of 105Pd with keV-Neutrons Produced by Using a Pulsed Proton Beam

Tae-Ik Ro,Guinyun Kim,Byeong Ryong Park,Hyun Kim,Kwangsoo Kim,Masayuki Igashira,Samyol Lee,Toshiro Ohsaki,Won-Chung Chung,Yeong-Rok Kang,Youngdo Oh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I

The neutron capture cross-section of $^{105}$Pd has been measured in the neutron energy range from 10 to 90 keV by using the 3-MV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. A neutron time-of-flight method was adopted with a 1.5-ns pulsed neutron source obtained by using the $^7$Li(p,n)$^7$Be reaction and with a large anti-Compton NaI(Tl) $\gamma$-ray spectrometer. A pulse-height weighting technique was applied to measure the capture $\gamma$-ray pulse-height spectra to derive the capture yields. The capture cross-sections were obtained by using the standard capture cross-section of $^{197}$Au. The present results were corrected for isotope impurities of the sample because the samples contained various palladium isotopes. The present results were compared with previous measurements and with the evaluated data of ENDF/B-VII-b2, JEFF-3.1, and JENDL-3.3.