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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
Times Cited Count:0 Percentile:0.11(Physics, Nuclear)Utsunomiya, Hiroaki*; Goriely, S.*; Kimura, Masaaki*; Shimizu, Noritaka*; Utsuno, Yutaka; Tveten, G. M.*; Renstrm, T.*; Ariizumi, Takashi*; Miyamoto, Shuji*
Physical Review C, 109(1), p.014617_1 - 014617_7, 2024/01
Times Cited Count:0 Percentile:0.11no abstracts in English
Omer, M.; Shizuma, Toshiyuki*; Koizumi, Mitsuo; Hajima, Ryoichi*; Hashimoto, Satoshi*; Miyamoto, Shuji*
LASTI Annual Report, 24, p.20 - 22, 2023/12
Shizuma, Toshiyuki*; Minato, Futoshi; Omer, M.*; Hayakawa, Takehito*; Ogaki, Hideaki*; Miyamoto, Shuji*
Physical Review C, 103(2), p.024309_1 - 024309_8, 2021/02
Times Cited Count:4 Percentile:54.40(Physics, Nuclear)Low-lying dipole transitions in Pb were measured via nuclear photon scattering using a quasi-monochromatic, linearly polarized photon beam. The electric (
) and magnetic (
) dipole strengths were extracted for excitation energies up to 6.8 MeV. The present (
,
) results, combined with (
,
) data from the literature, were used to investigate the
and
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).
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:50.46(Radiology, Nuclear Medicine & Medical Imaging)The 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.
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:8 Percentile:65.31(Nuclear Science & Technology)no abstracts in English
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:9 Percentile:58.65(Physics, Nuclear)The low-lying dipole strength in 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
-rays with respect to the polarization plane of the incident photon beam. The summed magnetic dipole (M1) strength was determined as
at excitation energies between 7.5 and 12.1 MeV; the summed electric dipole (E1) strength was obtained as
fm
. 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.
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:6 Percentile:48.81(Nuclear Science & Technology)We have proposed a new selective isotope transmutation method using photonuclear reactions with quasi-monochromatic -ray beams. This method is based on the fact that the particle threshold of a long-lived fission product (LLFP) such as
Zr,
Pd, or
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
-ray sources and neutron capture
-rays in nuclear reactors are candidates for this method.
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:48.70(Physics, Nuclear)We have measured the azimuthal anisotropy of neutrons emitted from the Fe(
, n)
Fe reaction with a linearly polarized
ray beam generated by laser Compton scattering at NewSUBARU. Neutron yields at the polar angle of 90
have been measured as a function of the azimuthal angle
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
+
cos(2
).
Hayakawa, Takehito; Miyamoto, Shuji*
Isotope News, (734), p.12 - 16, 2015/06
It was predicted in 1950's that the neutron angular distribution in (,n) reactions with a 100% linearly polarized
-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
-ray beam. The laser Compton scattering (LCS)
-ray beam has been developed. We can use almost 100% linear polarized photon beam. We have verified experimentally the neutron angular distribution on
Au,
I, and natural Cu using linearly polarized laser Compton scattering
-rays at NewSUBARU. The result suggests the (polarized
,n) reaction is a novel tool to study the nuclear physics.
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:18 Percentile:74.32(Astronomy & Astrophysics)It was predicted in 1950's, the neutron angular distribution in (, n) reactions with a 100% linearly polarized
-ray beam should be anisotropic and described by a simple function of a + b sin
at 90
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
Au,
I, and natural Cu using linearly polarized laser Compton scattering
-rays at NewSUBARU.
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:30 Percentile:89.53(Instruments & Instrumentation)We measured pulse-height spectra of 16.7 MeV laser-Compton scattering photons with a 6"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.
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:75 Percentile:97.88(Instruments & Instrumentation)A new laser Compton ray source in the energy range of several-MeV was developed using a CO
laser at the NewSUBARU electron storage ring. When the electron energies were 974, 1220 and 1460 MeV, the maximum
ray energies were measured to be 1.72, 2.72, and 3.91 MeV. The luminosity of the
rays was 7300 photon/mA/W/s and a flux of 5.8
10
photon/s was achieved. These performances agreed with calculations. This generation of
rays is in a no-loss mode for the storage electrons, and the maximum flux was limited only by the power of the laser.
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:60.77(Physics, Nuclear)no abstracts in English
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.
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:29 Percentile:82.68(Physics, Nuclear)We report a half-life of the ground state of Re populated by the
Re
Re reaction with the laser Compton scattering
-rays generated through relativistic engineering. The
-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
Re to be 38.0
0.5 d, including a possible contribution from the 8
isomer (
= 169
8 d) of
Re since the presence of the isomer was not known at that time. In contrast, the
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
0.7 d is shorter than the previous half-life by about 7%. This difference is crucial for applications using the activation method.
; Miyamoto, Shuji*; ; ; ; Hasegawa, Makoto; Yamazaki, Yoshio
JNC TY9400 2000-008, 20 Pages, 2000/03
no abstracts in English
Shizuma, Toshiyuki; Hayakawa, Takehito; Kawase, Keigo; Fujiwara, Mamoru; Miyamoto, Shuji*; Horikawa, Ken*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Hayashi, Yukio; Kando, Masaki; Kawase, Keigo; Kikuzawa, Nobuhiro; Hajima, Ryoichi; Chiba, Satoshi; Miyamoto, Shuji*; Mochizuki, Takayasu*; et al.
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Miyamoto, Shuji*; Amano, So*; Horikawa, Ken*; Ishihara, Kazuki*; Mori, Michiaki; Kawase, Keigo; Kando, Masaki; Kikuzawa, Nobuhiro; et al.
no journal, ,
no abstracts in English