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Journal Articles

Reaction-yield dependence of the ($$gamma$$, $$gamma$$') reaction of $$^{238}$$U on the target thickness

Negm, H.*; Ogaki, Hideaki*; Daito, Izuru*; Hayakawa, Takehito; Zen, H.*; Kii, Toshiteru*; Masuda, Kai*; Hori, Toshitada*; Hajima, Ryoichi; Shizuma, Toshiyuki; et al.

Journal of Nuclear Science and Technology, 52(6), p.811 - 820, 2015/06

 Times Cited Count:3 Percentile:32.14(Nuclear Science & Technology)

The dependence of the nuclear resonance fluorescence (NRF) yield on the target thickness was studied. To this end, an NRF experiment was performed on $$^{238}$$U using a laser Compton back-scattering (LCS) $$gamma$$-ray beam at the High Intensity $$gamma$$-ray Source facility at Duke University.

Journal Articles

Analysis of nuclear resonance fluorescence excitation measured with LaBr$$_{3}$$(Ce) detectors near 2 MeV

Omer, M.*; Negm, H.*; Ogaki, Hideaki*; Daito, Izuru*; Hayakawa, Takehito; Bakr, M.*; Zen, H.*; Hori, Toshitada*; Kii, Toshiteru*; Masuda, Kai*; et al.

Nuclear Instruments and Methods in Physics Research A, 729, p.102 - 107, 2013/11

 Times Cited Count:5 Percentile:43.78(Instruments & Instrumentation)

The performance of LaBr$$_{3}$$ (Ce) to measure nuclear resonance fluorescence (NRF) excitations is discussedin terms of limits of detection and in comparison with high-purity germanium (HPGe)detectors near the 2 MeV region where many NRF excitation levels from special nuclear materials are located. The NRF experiment was performed at the High Intensity Gamma-ray Source (HIGS) facility of Duke University. The incident $$gamma$$-rays, of 2.12 MeV energy, hit a B$$_{4}$$C target to excite the $$^{11}$$B nuclei to the first excitation level. The statistical-sensitive non-linear peak clipping (SNIP) algorithm was implemented to eliminate theback ground and enhance the limits of detection for the spectra measured with LaBr$$_{3}$$ (Ce). Both detection and determination limits were deduced from the experimental data.

Journal Articles

Nuclear resonance fluorescence of $$^{235}$$U measured with high-resolution LaBr$$_3$$(Ce) scintillation detectors

Omer, M.*; Negm, H.*; Zen, H.*; Daito, Izuru*; Kii, Toshiteru*; Masuda, Kai*; Ogaki, Hideaki*; Hajima, Ryoichi; Shizuma, Toshiyuki; Hayakawa, Takehito; et al.

Japanese Journal of Applied Physics, 52(10), p.106401_1 - 106401_4, 2013/10

 Times Cited Count:6 Percentile:30.5(Physics, Applied)

A nuclear resonance fluorescence (NRF) experiment was performed on a $$^{235}$$U target with quasi-monochromatic $$gamma$$-rays at the High Intensity Gamma-ray Source (HIGS) facility of Duke University using a 1733 keV resonant energy. A LaBr$$_3$$ (Ce) detector array consisting of eight cylindrical detectors, each with a length of 7.62 cm and a diameter of 3.81 cm, was implemented in this measurement. Moreover, a high-purity germanium (HPGe) detector array consisting of four detectors, each of which has a relative efficiency of 60%, was used as the benchmark for the measurement taken using the LaBr$$_3$$ (Ce) detector array. The integrated cross section of the NRF level, measured with LaBr$$_3$$ (Ce) detectors, showed good agreement with the available data.

Journal Articles

Nondestructive detection of hidden chemical compounds with laser Compton-scattering $$gamma$$ rays

Hayakawa, Takehito; Ogaki, Hideaki*; Shizuma, Toshiyuki; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Minehara, Eisuke; Kii, Toshiteru*; Toyokawa, Hiroyuki*

Review of Scientific Instruments, 80(4), p.045110_1 - 045110_5, 2009/04

 Times Cited Count:23 Percentile:70.34(Instruments & Instrumentation)

A non-destructive assay method for measuring a shielded chemical compound has been proposed. The chemical compound is measured by using a nuclear resonance fluorescence (NRF) measurement technique with an energy tunable laser Compton scattering (LCS) $$gamma$$-ray source. This method has an advantage that hidden materials can be detected through heavy shields such as iron plates of a thickness of several centimeters. A detection of a chemical compound of melamine, C$$_{3}$$H$$_{6}$$N$$_{6}$$, shielded by 15-mm-thick iron and 4-mm-thick lead plates is demonstrated. The NRF $$gamma$$-rays of $$^{12}$$C and $$^{14}$$N of the melamine are measured by using the LCS $$gamma$$-rays of the energies of up to 5.0 MeV. The observed ratio ($$^{12}$$C/$$^{14}$$N)$$_{exp}$$ = 0.39 $$pm$$ 0.12 is consistent with (C/N)$$_{melamine}$$ = 0.5.

JAEA Reports

Research on spherically converging ion-beam fusion neutron source for the fundamental research of atomic energy, JAERI's nuclear research promotion program, H10-050 (Contract research)

Yoshikawa, Kiyoshi*; Inoue, Nobuyuki*; Yamazaki, Tetsuo*; Makino, Keisuke*; Yamamoto, Yasushi*; Toku, Hisayuki*; Masuda, Kai*; Kii, Toshiteru*; Onishi, Masami*; Horiike, Hiroshi*; et al.

JAERI-Tech 2002-020, 63 Pages, 2002/03

JAERI-Tech-2002-020.pdf:4.94MB

no abstracts in English

Oral presentation

Nondestructive detection of isotopes using nuclear resonance fluorescence with laser Compton scattering $$gamma$$-rays

Hayakawa, Takehito; Shizuma, Toshiyuki; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Katsumura, Soichiro; Seya, Michio; Harada, Hideo; Toyokawa, Hiroyuki*; Kii, Toshiteru*; Ogaki, Hideaki

no journal, , 

We propose a non-destructive assay method for measuring an isotope and a chemical compound hidden by heavy shields such as iron plates of a thickness of several centimeters. We use a nuclear resonance fluorescence (NRF) measurement technique with an energy tunable laser Compton scattering (LCS) $$gamma$$-ray source. Isotope mapping of a block of $$^{208}$$Pb concealed in an iron box of 1.5 cm thickness has been demonstrated. We also demonstrate detection of a chemical compound of melamine, C$$_{3}$$H$$_{6}$$N$$_{6}$$, shielded by 15-mm-thick iron and 4-mm-thick lead plates. We measure NRF $$gamma$$-rays of $$^{12}$$C and $$^{14}$$N of the melamine by using the LCS $$gamma$$-rays of the energies of up to 5.0 MeV. The observed ratio ($$^{12}$$C/$$^{14}$$N)$$_{rm exp}$$ = 0.39 $$pm$$ 0.12 is consistent with (C/N)$$_{rm melamine}$$ = 0.5.

Oral presentation

Nuclear resonance fluorescence in U-238 using LaBr detectors for nuclear security

Hayakawa, Takehito; Negm, H.*; Ogaki, Hideaki*; Daito, Izuru*; Kii, Toshiteru*; Zen, H.*; Omer, M.*; Shizuma, Toshiyuki; Hajima, Ryoichi

no journal, , 

Recently, a nondestructive measurement method of shielded fissional isotopes such as $$^{235}$$U or $$^{239}$$Pu has been proposed for the nuclear security. These isotopes are measured by using nuclear resonance fluorescence (NRF) with monochromatic energy $$gamma$$-ray beams generated by laser Compton-scattering (LCS). We have proposed that one measure scattered $$gamma$$-rays from NRF with LCS $$gamma$$-ray beams using the LaBr$$_{3}$$(Ce) detectors. The LaBr$$_{3}$$(Ce) crystals include internal radioisotopes of a meta-stable isotope $$^{138}$$La and alpha decay chains from some actinides as $$^{227}$$Ac. There is a broad pump at about 2 MeV. This pump is considered to be an overlap of $$alpha$$-rays from decay chains of some actinides but its detailed structure has not been established. Here we have measured NRF spectra of $$^{238}$$U using the LCS $$gamma$$-rays with energy of about 2.5 MeV at the HIgS facility of the Duke University. The background has been evaluated using a simulation code GEAT4. The 9 peaks, 8 NRF $$gamma$$-rays plus the Compton scattered $$gamma$$-ray of the incident beam, are finally assigned in an energy range of about 200 keV at about 2.5 MeV. The 8 integrated NRF cross-sections measured by LaBr$$_{3}$$(Ce) have been consistent with results by an HPGe detector. The three levels are newly assigned using the HPGe detector. Two of them are also measured by LaBr$$_{3}$$(Ce).

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