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Journal Articles

Parity assignment for low-lying dipole states in $$^{58}$$Ni

Shizuma, Toshiyuki*; Omer, M.; Hayakawa, Takehito*; Minato, Futoshi*; Matsuba, Shunya*; Miyamoto, Shuji*; Shimizu, Noritaka*; Utsuno, Yutaka

Physical Review C, 109(1), p.014302_1 - 014302_7, 2024/01

Journal Articles

Photoneutron emission cross sections for $$^{13}$$C

Utsunomiya, Hiroaki*; Goriely, S.*; Kimura, Masaaki*; Shimizu, Noritaka*; Utsuno, Yutaka; Tveten, G. M.*; Renstr${o}$m, T.*; Ariizumi, Takashi*; Miyamoto, Shuji*

Physical Review C, 109(1), p.014617_1 - 014617_7, 2024/01

no abstracts in English

Journal Articles

Cross section asymmetry of polarized $$gamma$$-ray elastic scattering

Omer, M.; Shizuma, Toshiyuki*; Koizumi, Mitsuo; Hajima, Ryoichi*; Hashimoto, Satoshi*; Miyamoto, Shuji*

LASTI Annual Report, 24, p.20 - 22, 2023/12

Journal Articles

Low-lying electric and magnetic dipole strengths in $$^{207}$$Pb

Shizuma, Toshiyuki*; Minato, Futoshi; Omer, M.*; Hayakawa, Takehito*; Ogaki, Hideaki*; Miyamoto, Shuji*

Physical Review C, 103(2), p.024309_1 - 024309_8, 2021/02

AA2020-0675.pdf:0.29MB

 Times Cited Count:4 Percentile:58.42(Physics, Nuclear)

Low-lying dipole transitions in $$^{207}$$Pb were measured via nuclear photon scattering using a quasi-monochromatic, linearly polarized photon beam. The electric ($$E1$$) and magnetic ($$M1$$) dipole strengths were extracted for excitation energies up to 6.8 MeV. The present ($$vec{gamma}$$,$$gamma'$$) results, combined with ($$gamma$$,$$n$$) data from the literature, were used to investigate the $$E1$$ and $$M1$$ photoabsorption cross sections near the neutron separation energy by comparison with predictions of the particle-vibration coupling on top of the quasi-particle random phase approximation (PVC+QRPA).

Journal Articles

Real-time ${{it in vivo}}$ dosimetry system based on an optical fiber-coupled microsized photostimulable phosphor for stereotactic body radiation therapy

Yada, Ryuichi*; Maenaka, Kazusuke*; Miyamoto, Shuji*; Okada, Go*; Sasakura, Aki*; Ashida, Motoi*; Adachi, Masashi*; Sato, Tatsuhiko; Wang, T.*; Akasaka, Hiroaki*; et al.

Medical Physics, 47(10), p.5235 - 5249, 2020/10

 Times Cited Count:7 Percentile:53.18(Radiology, Nuclear Medicine & Medical Imaging)

The ${{it in vivo}}$ dosimeter system is capable of real-time, accurate, and precise measurement under stereotactic body radiation therapy (SBRT) conditions. The probe is smaller than a conventional dosimeter, has excellent spatial resolution, and can be valuable in SBRT with a steep dose distribution over a small field. The developed PSP dosimeter system appears to be suitable for in vivo SBRT dosimetry.

Journal Articles

Neutron emission spectrum from gold excited with 16.6 MeV linearly polarized monoenergetic photons

Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*

Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04

 Times Cited Count:4 Percentile:62.49(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Low-lying dipole strength in $$^{52}$$Cr

Shizuma, Toshiyuki*; Hayakawa, Takehito*; Daito, Izuru*; Ogaki, Hideaki*; Miyamoto, Shuji*; Minato, Futoshi

Physical Review C, 96(4), p.044316_1 - 044316_10, 2017/10

 Times Cited Count:8 Percentile:55.72(Physics, Nuclear)

The low-lying dipole strength in $$^{52}$$Cr was measured in nuclear resonance fluorescence experiments using a quasi-monochromatic, linearly polarized photon beam. The parities of the excited dipole states were determined by the intensity asymmetry of resonantly scattered $$gamma$$-rays with respect to the polarization plane of the incident photon beam. The summed magnetic dipole (M1) strength was determined as $$sum B(M1)uparrow=5.64(34) mu_N^2$$ at excitation energies between 7.5 and 12.1 MeV; the summed electric dipole (E1) strength was obtained as $$sum B(E1)uparrow=73.7(23) times 10^{-3} e^2$$ fm$$^2$$. The observed M1 and E1 strengths were compared via random phase approximation calculations using the Skyrme interaction. The effects of 2 particle-2 hole configuration mixing and tensor force on dipole strength distributions were investigated.

Journal Articles

Proposal for selective isotope transmutation of long-lived fission products using quasi-monochromatic $$gamma$$-ray beams

Hayakawa, Takehito; Miyamoto, Shuji*; Hajima, Ryoichi; Shizuma, Toshiyuki; Amano, So*; Hashimoto, Satoshi*; Misawa, Tsuyoshi*

Journal of Nuclear Science and Technology, 53(12), p.2064 - 2071, 2016/12

 Times Cited Count:5 Percentile:43.6(Nuclear Science & Technology)

We have proposed a new selective isotope transmutation method using photonuclear reactions with quasi-monochromatic $$gamma$$-ray beams. This method is based on the fact that the particle threshold of a long-lived fission product (LLFP) such as $$^{93}$$Zr, $$^{107}$$Pd, or $$^{79}$$Se is lower than those of stable isotopes of the same chemical element. Therefore, this method has an excellent advantage that LLFPs cannot, in principle, be produced newly even if the target materials include stable isotopes in addition to a LLFP. Laser Compton scattering $$gamma$$-ray sources and neutron capture $$gamma$$-rays in nuclear reactors are candidates for this method.

Journal Articles

Spatial anisotropy of neutrons emitted from the $$^{56}$$Fe($$gamma$$, n)$$^{55}$$Fe reaction with a linearly polarized $$gamma$$-ray beam

Hayakawa, Takehito; Shizuma, Toshiyuki; Miyamoto, Shuji*; Amano, Sho*; Takemoto, Akinori*; Yamaguchi, Masashi*; Horikawa, Ken*; Akimune, Hidetoshi*; Chiba, Satoshi*; Ogata, Kazuyuki*; et al.

Physical Review C, 93(4), p.044313_1 - 044313_4, 2016/04

 Times Cited Count:7 Percentile:49.44(Physics, Nuclear)

We have measured the azimuthal anisotropy of neutrons emitted from the $$^{56}$$Fe($$gamma$$, n)$$^{55}$$Fe reaction with a linearly polarized $$gamma$$ ray beam generated by laser Compton scattering at NewSUBARU. Neutron yields at the polar angle of 90$$^{circ}$$ have been measured as a function of the azimuthal angle $$phi$$ between the detector and the linear polarization plane of the ray beam. The azimuthal anisotropy of neutrons measured at seven angles has been well reproduced using a theoretically predicted function of $$a$$ + $$b$$cos(2$$phi$$).

Journal Articles

Verification nuclear photoreaction using laser Compton scattering $$gamma$$-rays

Hayakawa, Takehito; Miyamoto, Shuji*

Isotope News, (734), p.12 - 16, 2015/06

It was predicted in 1950's that the neutron angular distribution in ($$gamma$$,n) reactions with a 100% linearly polarized $$gamma$$-ray beam for dipole excitation should be anisotropic.However, it has not been experimentally confirmed over half a century becuase of the lack of useful linear polarized $$gamma$$-ray beam. The laser Compton scattering (LCS) $$gamma$$-ray beam has been developed. We can use almost 100% linear polarized photon beam. We have verified experimentally the neutron angular distribution on $$^{197}$$Au, $$^{127}$$I, and natural Cu using linearly polarized laser Compton scattering $$gamma$$-rays at NewSUBARU. The result suggests the (polarized $$gamma$$,n) reaction is a novel tool to study the nuclear physics.

Journal Articles

Neutron angular distribution in ($$gamma$$, n) reactions with linearly polarized $$gamma$$-ray beam generated by laser Compton scattering

Horikawa, Ken*; Miyamoto, Shuji*; Mochizuki, Takayasu*; Amano, So*; Li, D.*; Imasaki, Kazuo*; Izawa, Yasukazu*; Ogata, Kazuyuki*; Chiba, Satoshi*; Hayakawa, Takehito

Physics Letters B, 737, p.109 - 113, 2014/10

 Times Cited Count:17 Percentile:73.21(Astronomy & Astrophysics)

It was predicted in 1950's, the neutron angular distribution in ($$gamma$$, n) reactions with a 100% linearly polarized $$gamma$$-ray beam should be anisotropic and described by a simple function of a + b sin$$^{2}$$$${theta}$$ at 90$$^{circ}$$ on the beam axis but it has not been experimentally confirmed for middle-heavy nuclides over than half a century. We have verified experimentally this angular distribution on $$^{197}$$Au, $$^{127}$$I, and natural Cu using linearly polarized laser Compton scattering $$gamma$$-rays at NewSUBARU.

Journal Articles

Research and development activities for cleanup of the Fukushima Daiichi Nuclear Power Station

Sasaki, Toshiki; Kaminishi, Shuji*; Miyamoto, Yasuaki; Funasaka, Hideyuki

Materials Research Society Symposium Proceedings, Vol.1518, p.257 - 268, 2013/10

BB2012-2567.pdf:1.85MB

The Fukushima Daiichi Nuclear Power Station accident and restoration works have produced significant volume of radioactive waste. The waste has very different characteristics from usual radioactive waste produced in nuclear power stations and it requires extensive research and development for management of the waste. R&D works such as radionuclide analysis of the waste, hydrogen generation/diffusion analysis of a storage vessel, corrosion evaluation of storage vessels, etc. have been performed for characterization and safe storage of the waste. The detailed R&D plan for processing and disposal waste will be established by the end of FY2012.

Journal Articles

Research and development on waste management for the Fukushima Daiichi NPS by JAEA

Koma, Yoshikazu; Ashida, Takashi; Meguro, Yoshihiro; Miyamoto, Yasuaki; Sasaki, Toshiki; Yamagishi, Isao; Kameo, Yutaka; Terada, Atsuhiko; Hiyama, Toshiaki; Koyama, Tomozo; et al.

Proceedings of International Nuclear Fuel Cycle Conference; Nuclear Energy at a Crossroads (GLOBAL 2013) (CD-ROM), p.736 - 743, 2013/09

Fukushima Daiichi Nuclear Power Station (F1NPS), TEPCO, was severely damaged with the hydrogen explosions caused by losing their cooling functions due to the earthquake and the tsunami occurred on March 11, 2011. Radioactive wastes generated from the current FINPS and future their decommission and demolition are greater huge amount than those from general reactors and nuclear fuel facilities. Toward accomplishing safe and reasonable management of the wastes, great effort of R&Ds has been strongly required and performed in bringing together the knowledge and experience of all of Japan. This report outlines the current status of the R&Ds performed in JAEA.

Journal Articles

Determination of the number of pulsed laser-Compton scattering photons

Kondo, Takeo*; Utsunomiya, Hiroaki*; Akimune, Hidetoshi*; Yamagata, Tamio*; Okamoto, Akiyuki*; Harada, Hideo; Kitatani, Fumito; Shima, Tatsushi*; Horikawa, Ken*; Miyamoto, Shuji*

Nuclear Instruments and Methods in Physics Research A, 659(1), p.462 - 466, 2011/12

 Times Cited Count:27 Percentile:89.24(Instruments & Instrumentation)

We measured pulse-height spectra of 16.7 MeV laser-Compton scattering photons with a 6"$$times$$5" NaI(Tl) detector for blank and three lead materials of 75.8, 50.9, and 25.9% transmissions at the NewSUBARU facility to investigate how the original Poisson distribution of the pulsed photons is modified after passing through thick-target materials. We present a well-prescribed method of determining the number of incident photons within 3.5% accuracy based on the response of the NaI(Tl) detector to the pulsed photon beams.

Journal Articles

Several-MeV $$gamma$$-ray generation at NewSUBARU by laser Compton backscattering

Amano, Sho*; Horikawa, Ken*; Ishihara, Kazuki*; Miyamoto, Shuji*; Hayakawa, Takehito; Shizuma, Toshiyuki; Mochizuki, Takayasu*

Nuclear Instruments and Methods in Physics Research A, 602(2), p.337 - 341, 2009/04

 Times Cited Count:65 Percentile:97.71(Instruments & Instrumentation)

A new laser Compton $$gamma$$ ray source in the energy range of several-MeV was developed using a CO$$_2$$ laser at the NewSUBARU electron storage ring. When the electron energies were 974, 1220 and 1460 MeV, the maximum $$gamma$$ ray energies were measured to be 1.72, 2.72, and 3.91 MeV. The luminosity of the $$gamma$$ rays was 7300 photon/mA/W/s and a flux of 5.8$$times$$10$$^6$$ photon/s was achieved. These performances agreed with calculations. This generation of $$gamma$$ rays is in a no-loss mode for the storage electrons, and the maximum flux was limited only by the power of the laser.

Journal Articles

Half-life of the $$^{164}$$Ho by the ($$gamma$$,$$n$$) reaction from Laser Compton scattering $$gamma$$ rays at the electron storage ring NewSUBARU

Hayakawa, Takehito; Shizuma, Toshiyuki; Miyamoto, Shuji*; Amano, So*; Horikawa, Ken*; Ishihara, Kazuki*; Mori, Michiaki; Kawase, Keigo; Kando, Masaki; Kikuzawa, Nobuhiro; et al.

Physical Review C, 77(6), p.068801_1 - 068801_4, 2008/06

 Times Cited Count:12 Percentile:61.07(Physics, Nuclear)

no abstracts in English

Journal Articles

Absolute calibration of imaging plate for GeV electrons

Nakanii, Nobuhiko*; Kondo, Kiminori; Yabuuchi, Toshinori*; Tsuji, Kazuki*; Tanaka, Kazuo*; Suzuki, Shinsuke*; Asaka, Takao*; Yanagida, Kenichi*; Hanaki, Hirofumi*; Kobayashi, Takashi*; et al.

Review of Scientific Instruments, 79(6), p.166102_1 - 066102_3, 2008/06

An imaging plate has been used as a useful detector of energetic electrons in laser electron acceleration and laser fusion studies. The absolute sensitivity of an imaging plate was calibrated at 1 GeV electron energy using the injector Linac of SPring-8. The sensitivity curve obtained up to 100 MeV in a previous study was extended successfully to GeV range.

Journal Articles

Half-life of $$^{184}$$Re populated by the $$(gamma,n)$$ reaction from laser Compton scattering $$gamma$$ rays at the electron storage ring NewSUBARU

Hayakawa, Takehito; Miyamoto, Shuji*; Hayashi, Yukio; Kawase, Keigo*; Horikawa, Ken*; Chiba, Satoshi; Nakanishi, Kosuke*; Hashimoto, Hisanobu*; Ota, Takeshi*; Kando, Masaki; et al.

Physical Review C, 74(6), p.065802_1 - 065802_5, 2006/12

 Times Cited Count:28 Percentile:82.88(Physics, Nuclear)

We report a half-life of the ground state of $$^{184}$$Re populated by the $$^{185}$$Re$$(gamma,n)$$$$^{184}$$Re reaction with the laser Compton scattering $$gamma$$-rays generated through relativistic engineering. The $$gamma$$-rays are provided at the electron storage ring NewSUBARU. The previous experiment using deuteron-induced reactions has yielded a recommended half-life of the 3$$^-$$ ground state of $$^{184}$$Re to be 38.0 $$pm$$ 0.5 d, including a possible contribution from the 8$$^{+}$$ isomer ($$T_{1/2}$$ = 169 $$pm$$ 8 d) of $$^{184}$$Re since the presence of the isomer was not known at that time. In contrast, the $$(gamma,n)$$ reaction has an advantage to selectively populate the ground state because this reaction does not bring large angular momentum. The measured half-life of 35.4 $$pm$$ 0.7 d is shorter than the previous half-life by about 7%. This difference is crucial for applications using the activation method.

JAEA Reports

None

*; Miyamoto, Shuji*; *; *; *; Hasegawa, Makoto; Yamazaki, Yoshio

JNC TY9400 2000-008, 20 Pages, 2000/03

JNC-TY9400-2000-008.pdf:0.81MB

no abstracts in English

Oral presentation

Alpha radioactivity measurement based on ionized air transportation technology, 13; Influence evaluation of background drift

Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Izumi, Mikio*; Naito, Susumu*; Yamamoto, Shuji*; Sano, Akira*; Nambu, Kenichi*; Takahashi, Hiroyuki*; Oda, Akinori*

no journal, , 

no abstracts in English

44 (Records 1-20 displayed on this page)