Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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.
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 5.810 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
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 ReRe 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.
Nishihara, Katsunobu*; Nishimura, Hiroaki*; Mochizuki, Takayasu*; Sasaki, Akira
Reza Kenkyu, 32(5), p.330 - 336, 2004/05
no abstracts in English
; Miyamoto, Shuji*; ; ; ; Hasegawa, Makoto; Yamazaki, Yoshio
JNC TY9400 2000-008, 20 Pages, 2000/03
no abstracts in English
Hayakawa, Takehito; Horikawa, Ken*; Mochizuki, Takayasu*; Miyamoto, Shuji*; Amano, So*; Izawa, Yasukazu*; Imasaki, Kazuo*; Chiba, Satoshi*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Miyamoto, Shuji*; Horikawa, Ken*; Mochizuki, Takayasu*; Amano, So*; Li, D.*; Imasaki, Kazuo*; Izawa, Yasukazu*; Chiba, Satoshi*; Ogata, Kazuyuki*
no journal, ,
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 and universally described by the simple function of a + bcos() at polar angle = 90, where is the azimuthal angle,but it has not been experimentally confirmed over half a century. We have verified experimentally this angular distribution on three targets using linearly polarized laser Compton scattering -rays at NewSUBARU.
Hayakawa, Takehito; Shizuma, Toshiyuki; Angell, C.; Akimune, Hidetoshi*; Miyamoto, Shuji*; Amano, So*; Mochizuki, Takayasu*; Chiba, Satoshi*; Ogata, Kazuyuki*; Fujiwara, Mamoru*
no journal, ,
Neutron angular distributions from (, n) reactions on heavy isotopes have not been studied yet. We report a result of the photon-induced reaction on Fe. We have measured neutrons using a time-of-flight method. We have measured angular distribution of neutrons by change of the angle of the linear polarization plain of the incident -ray beam. The -ray beam has been generated by laser Compton scattering at NewSUBARU.
Hayakawa, Takehito; Horikawa, Ken*; Miyamoto, Shuji*; Mochizuki, Takayasu*; Amano, So*; Li, D.*; Imasaki, Kazuo*; Izawa, Yasukazu*; Ogata, Kazuyuki*; Chiba, Satoshi*
no journal, ,
In 1950's, Agodi predicted that the neutron angular distribution in (, n) reactions with a 100% linearly polarized -ray beam for dipole excitation should be anisotropic and universally described by the simple function of a + bcos()at polar angle =90, where is the azimuthal angle, but it has not been experimentally confirmed over half a century. The work by Agodi had been forgotten after 1970's. We have verified experimentally this angular distribution on three targets using linearly polarized laser Compton scattering -rays at NewSUBARU for the first time.
Hayakawa, Takehito; Miyamoto, Shuji*; Hayashi, Yukio; Kawase, Keigo*; Horikawa, Ken*; Chiba, Satoshi; Nakanishi, Kosuke*; Hashimoto, Hisanobu*; Ota, Takeshi*; Kando, Masaki; et al.
no journal, ,
no abstracts in English
Hayakawa, Takehito; Miyamoto, Shuji*; Mochizuki, Takayasu*; Horikawa, Ken*; Amano, So*; Li, D.*; Imasaki, Kazuo*; Izawa, Yasukazu*; Ogata, Kazuyuki*; Chiba, Satoshi*
no journal, ,
The M1 strength in atomic nuclei is important for estimation of neutrino-nucleus interactions in supernovae. We have proposed a method using (, n) reactions with linear polarized laser Compton scattering (LCS) -rays to measure the M1 strength and verified a theoretical prediction for the first time.
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; Miyamoto, Shuji*; Hayashi, Yukio; Kawase, Keigo*; Horikawa, Ken*; Chiba, Satoshi; Nakanishi, Kosuke*; Hashimoto, Hisanobu*; Ota, Takeshi*; Kando, Masaki; 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
Hayakawa, Takehito; Shizuma, Toshiyuki; Miyamoto, Shuji*; Amano, Sho*; Horikawa, Ken*; Hayashi, Yukio; Kawase, Keigo; Kando, Masaki; Kikuzawa, Nobuhiro; Chiba, Satoshi; et al.
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Kawase, Keigo; Kikuzawa, Nobuhiro; Chiba, Satoshi; Kando, Masaki; Miyamoto, Shuji*; Mochizuki, Takayasu*; Kajino, Toshitaka*; Fujiwara, Mamoru
no journal, ,
no abstracts in English