Papers - AKIMUNE Hidetoshi
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Effect of ground-state deformation on isoscalar giant resonances in Si 28 Reviewed
T Peach, U Garg, YK Gupta, J Hoffman, JT Matta, D Patel, PV Madhusudhana Rao, K Yoshida, M Itoh, M Fujiwara, K Hara, H Hashimoto, K Nakanishi, M Yosoi, H Sakaguchi, S Terashima, S Kishi, T Murakami, M Uchida, Y Yasuda, H Akimune, T Kawabata, MN Harakeh, G Colò
Phys. Rev. C 93 64325 2016.11
Joint Work
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nterference Effect between ϕ and Λ (1520) Production Channels in the γ p→ K+ K− p Reaction near Threshold Reviewed
SY Ryu, JK Ahn, T Nakano, DS Ahn, S Ajimura, H Akimune, Y Asano, WC Chang, JY Chen, S Daté, H Ejiri, H Fujimura, M Fujiwara, S Fukui, S Hasegawa, K Hicks, K Horie, T Hotta, SH Hwang, K Imai, T Ishikawa, T Iwata, Y Kato, H Kawai, K Kino, H Kohri, Y Kon, N Kumagai, PJ Lin, Y Maeda, S Makino, T Matsuda, N Matsuoka, T Mibe, M Miyabe, M Miyachi, Y Morino, N Muramatsu, R Murayama, Y Nakatsugawa, M Niiyama, M Nomachi, Y Ohashi, H Ohkuma, T Ohta, T Ooba, DS Oshuev, JD Parker, C Rangacharyulu, A Sakaguchi, T Sawada, PM Shagin, Y Shiino, H Shimizu, EA Strokovsky, Y Sugaya, M Sumihama, AO Tokiyasu, Y Toi, H Toyokawa, T Tsunemi, M Uchida, M Ungaro, A Wakai, CW Wang, SC Wang, K Yonehara, T Yorita, M Yoshimura, M Yosoi, RGT Zegers, LEPS Collaboration
Phys. Rev. Lett. 116 232001 2016.11
Joint Work
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Deformation effects on isoscalar giant resonances in Mg 24 Reviewed
YK Gupta, U Garg, J Hoffman, J Matta, PV Madhusudhana Rao, D Patel, T Peach, K Yoshida, M Itoh, M Fujiwara, K Hara, H Hashimoto, K Nakanishi, M Yosoi, H Sakaguchi, S Terashima, S Kishi, T Murakami, M Uchida, Y Yasuda, H Akimune, T Kawabata, MN Harakeh
Phys. Rev. C 93 44324 2016.11
Joint Work
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Spatial anisotropy of neutrons emitted from the Fe 56 (γ, n) Fe 55 reaction with a linearly polarized γ-ray beam Reviewed
T Hayakawa, T Shizuma, S Miyamoto, S Amano, A Takemoto, M Yamaguchi, K Horikawa, H Akimune, S Chiba, K Ogata, M Fujiwara
Phys. Rev. C 93 44313 2016.11
Joint Work
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Measurement of the 77Se (γ, n) cross section and uncertainty evaluation of the 79Se (n, γ) cross section Reviewed
Fumito Kitatani, Hideo Harada, Shinji Goko, Nobuyuki Iwamoto, Hiroaki Utsunomiya, Hidetoshi Akimune, Hiroyuki Toyokawa, Kawakatsu Yamada, Masayuki Igashira
Journal of Nuclear Science and Technology 53 457 2016.11
Joint Work
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YK Gupta, U Garg, KB Howard, JT Matta, M _enyi_it, M Itoh, S Ando, T Aoki, A Uchiyama, S Adachi, M Fujiwara, C Iwamoto, A Tamii, H Akimune, C Kadono, Y Matsuda, T Nakahara, T Furuno, T Kawabata, M Tsumura, MN Harakeh, N Kalantar-Nayestanaki
Phys. Lett. B 760 482 - 485 2016.11
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S. Y. Ryu, J. K. Ahn, T. Nakano, D. S. Ahn, S. Ajimura, H. Akimune, Y. Asano, W. C. Chang, J. Y. Chen, S. Date, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, S. Hasegawa, K. Hicks, K. Horie, T. Hotta, S. H. Hwang, K. Imai, T. Ishikawa, T. Iwata, Y. Kato, H. Kawai, K. Kino, H. Kohri, Y. Kon, N. Kumagai, P. J. Lin, Y. Maeda, S. Makino, T. Matsuda, N. Matsuoka, T. Mibe, M. Miyabe, M. Miyachi, Y. Morino, N. Muramatsu, R. Murayama, Y. Nakatsugawa, S. I. Nam, M. Niiyama, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ohta, T. Ooba, D. S. Oshuev, J. D. Parker, C. Rangacharyulu, A. Sakaguchi, T. Sawada, P. M. Shagin, Y. Shiino, H. Shimizu, E. A. Strokovsky, Y. Sugaya, M. Sumihama, A. O. Tokiyasu, Y. Toi, H. Toyokawa, T. Tsunemi, M. Uchida, M. Ungaro, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yoshimura, M. Yosoi, R. G. T. Zegers
PHYSICAL REVIEW LETTERS 116 ( 23 ) 232001 2016.6
Joint Work
Publisher:AMER PHYSICAL SOC
The phi-Lambda(1520) interference effect in the gamma p -> K(+)K(-)p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between phi and Lambda(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the root s = 2.1 GeV bump structure in forward differential cross sections for phi photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.
DOI: 10.1103/PhysRevLett.116.232001
Other Link: http://orcid.org/0000-0001-5237-5718
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Effect of ground-state deformation on isoscalar giant resonances in Si-28
T. Peach, U. Garg, Y. K. Gupta, J. Hoffman, J. T. Matta, D. Patel, P. V. Madhusudhana Rao, K. Yoshida, M. Itoh, M. Fujiwara, K. Hara, H. Hashimoto, K. Nakanishi, M. Yosoi, H. Sakaguchi, S. Terashima, S. Kishi, T. Murakami, M. Uchida, Y. Yasuda, H. Akimune, T. Kawabata, M. N. Harakeh, G. Colo
PHYSICAL REVIEW C 93 ( 6 ) 64325 2016.6
Joint Work
Publisher:AMER PHYSICAL SOC
Multipole strength distributions for isoscalar L <= 2 transitions in Si-28 have been extracted using 386-MeV inelastic a scattering at extremely forward angles, including 0 degrees. Observed strength distributions are in good agreement with microscopic calculations for an oblate-deformed ground state. In particular, a large peak at an excitation energy of 17.7 MeV in the isoscalar giant monopole resonance strength is consistent with the calculations.
DOI: 10.1103/PhysRevC.93.064325
Other Link: http://orcid.org/0000-0001-5237-5718
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T. Hayakawa, T. Shizuma, S. Miyamoto, S. Amano, A. Takemoto, M. Yamaguchi, K. Horikawa, H. Akimune, S. Chiba, K. Ogata, M. Fujiwara
PHYSICAL REVIEW C 93 ( 4 ) 44313 2016.4
Joint Work
Publisher:AMER PHYSICAL SOC
We have measured the azimuthal anisotropy of neutrons emitted from the Fe-56(gamma, n)Fe-55 reaction with a linearly polarized gamma-ray beam generated by laser Compton scattering at NewSUBARU. Neutron yields at the polar angle of 90 degrees have been measured as a function of the azimuthal angle phi between the detector and the linear polarization plane of the gamma-ray beam. The azimuthal anisotropy of neutrons measured at phi = 0 degrees, 10 degrees, 25 degrees, 45 degrees, 60 degrees, 70 degrees, and 90 degrees has been well reproduced using a theoretically predicted function of a + b cos(2 phi).
DOI: 10.1103/PhysRevC.93.044313
Other Link: http://orcid.org/0000-0001-5237-5718
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Fumito Kitatani, Hideo Harada, Shinji Goko, Nobuyuki Iwamoto, Hiroaki Utsunomiya, Hidetoshi Akimune, Hiroyuki Toyokawa, Kawakatsu Yamada, Masayuki Igashira
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 53 ( 4 ) 475 - 485 2016.4
Joint Work
Publisher:TAYLOR & FRANCIS LTD
The Se-77 (gamma, n) cross section was measured for the energy range from 7.6 to 13.8 MeV by using quasi-monochromatic laser-Compton scattering gamma-rays. The advanced method to deduce gamma-ray strength functions from (gamma, n) cross section was developed. By utilizing the method, the gamma-ray strength functions of Se-77,Se- 78,Se- 80 were deduced so as to reproduce the Se-77,Se- 78,Se- 80 (gamma, n) cross sections measured in this work and previous systematic measurements. The inverse (n, gamma) cross sections for Se-76,Se- 77,Se- 79 isotopes were calculated using the statistical model calculation code CCONE with the deduced gamma-ray strength functions. The uncertainty of the calculated Se-79(n, gamma)Se-80 cross section was evaluated by comparing the calculations and the experimental data on Se-76,Se- 77 (n, gamma) cross sections.
DOI: 10.1080/00223131.2015.1056760
Other Link: http://orcid.org/0000-0001-5237-5718
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Deformation effects on isoscalar giant resonances in Mg-24
Y. K. Gupta, U. Garg, J. Hoffman, J. Matta, P. V. Madhusudhana Rao, D. Patel, T. Peach, K. Yoshida, M. Itoh, M. Fujiwara, K. Hara, H. Hashimoto, K. Nakanishi, M. Yosoi, H. Sakaguchi, S. Terashima, S. Kishi, T. Murakami, M. Uchida, Y. Yasuda, H. Akimune, T. Kawabata, M. N. Harakeh
PHYSICAL REVIEW C 93 ( 4 ) 44324 2016.4
Joint Work
Publisher:AMER PHYSICAL SOC
Strength distributions for isoscalar giant resonances with multipolarity L <= 2 have been determined in Mg-24 from "instrumental background-free" inelastic scattering of 386-MeV alpha particles at extreme forward angles, including 0 degrees. The isoscalar E0, E1, and E2 strengths are observed to be 57 +/- 7%, 111.1(-7.2)(+10.9)%, and 148.6 +/- 7.3%, respectively, of their energy-weighted sum rules in the excitation energy range of 6 to 35 MeV. The isoscalar giant monopole (ISGMR) and quadrupole (ISGQR) resonances exhibit a prominent K splitting which is consistent with microscopic theory for a prolate-deformed ground state of Mg-24. For the ISGQR it is due to splitting of the three K components, whereas for the ISGMR it is due to its coupling to the K = 0 component of the ISGQR. Deformation effects on the isoscalar giant dipole resonance are less pronounced, however.
DOI: 10.1103/PhysRevC.93.044324
Other Link: http://orcid.org/0000-0001-5237-5718
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Measurement of microwave radiation from electron beam in the atmosphere
I. S. Ohta, H. Akimune, M. Fukushima, D. Ikeda, Y. Inome, J. N. Matthews, S. Ogio, H. Sagawa, T. Sako, T. Shibata, T. Yamamoto
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 810 44 - 50 2016.2
Joint Work
Publisher:ELSEVIER SCIENCE BV
We report the use of an electron light source (ELS) located at the Telescope Array Observatory in Utah, USA, to measure the isotropic microwave radiation from air showers. To simulate extensive air showers, the ELS emits an electron beam into the atmosphere and a parabola antenna system for the satellite communication is used to measure the microwave radiation from the electron beam. Based on this measurement, an upper limit on the intensity of a 12.5 GHz microwave radiation at 0.5 m from a 10(18) eV air shower was estimated to be 3.96 x 10(-16) W m(-2) Hz(-1) with a 95% confidence level. (C) 2015 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.nima.2015.11.113
Other Link: http://orcid.org/0000-0001-5237-5718
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S. Bagchi, J. Gibelin, M. N. Harakeh, N. Kalantar-Nayestanaki, N. L. Achouri, H. Akimune, B. Bastin, K. Boretzky, H. Bouzomita, M. Caamano, L. Caceres, S. Damoy, F. Delaunay, B. Fernandez-Dominguez, M. Fujiwara, U. Garg, G. F. Grinyer, O. Kamalou, E. Khan, A. Krasznahorkay, G. Lhoutellier, J. F. Libin, S. Lukyanov, K. Mazurek, M. A. Najafi, J. Pancin, Y. Penionzhkevich, L. Perrot, R. Raabe, C. Rigollet, T. Roger, S. Sambi, H. Savajols, M. Senoville, C. Stodel, L. Suen, J. C. Thomas, M. Vandebrouck, J. Van de Walle
PHYSICS LETTERS B 751 371 - 375 2015.12
Joint Work
Publisher:ELSEVIER SCIENCE BV
The Isoscalar Giant Monopole Resonance (ISGMR) and the Isoscalar Giant Dipole Resonance (ISGDR) compression modes have been studied in the doubly-magic unstable nucleus Ni-56. They were measured by inelastic alpha-particle scattering in inverse kinematics at 50MeV/u with the MAYA active target at the GANIL facility. The centroid of the ISGMR has been obtained at E-x= 19.1 +/- 0.5 MeV. Evidence for the low-lying part of the ISGDR has been found at E-x = 17.4 +/- 0.7 MeV. The strength distribution for the dipole mode shows similarity with the prediction from the Hartree-Fock (HF) based random-phase approximation (RPA)[1]. These measurements confirm inelastic a-particle scattering as a suitable probe for exciting the ISGMR and the ISGDR modes in radioactive isotopes in inverse kinematics. (C) 2015 The Authors. Published by Elsevier B.V.
DOI: 10.1016/j.physletb.2015.10.060
Other Link: http://orcid.org/0000-0001-5237-5718
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Precision evaluation of the Ga 71 (ν e, e−) solar neutrino capture rate from the (He 3, t) charge-exchange reaction Reviewed
D Frekers, T Adachi, H Akimune, M Alanssari, BA Brown, BT Cleveland, H Ejiri, H Fujita, Y Fujita, M Fujiwara, VN Gavrin, MN Harakeh, K Hatanaka, M Holl, C Iwamoto, A Lennarz, A Okamoto, H Okamura, T Suzuki, A Tamii
Phys. Rev. C 91 34608 2015.11
Joint Work
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Observation of isoscalar multipole strengths in exotic doubly-magic 56 Ni in inelastic α scattering in inverse kinematics Reviewed
S Bagchi, J Gibelin, MN Harakeh, N Kalantar-Nayestanaki, NL Achouri, H Akimune, B Bastin, K Boretzky, H Bouzomita, M Caamaño, L Càceres, S Damoy, F Delaunay, B Fernández-Domínguez, M Fujiwara, U Garg, GF Grinyer, O Kamalou, E Khan, A Krasznahorkay, G Lhoutellier, JF Libin, S Lukyanov, K Mazurek, MA Najafi, J Pancin, Y Penionzhkevich, L Perrot, Riccardo Raabe, C Rigollet, T Roger, S Sambi, H Savajols, M Senoville, C Stodel, L Suen, JC Thomas, M Vandebrouck, J Van de Walle
Phys. Lett. B 751 371 2015.11
Joint Work
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Splitting of ISGMR strength in the light-mass nucleus 24 Mg due to ground-state deformation Reviewed
YK Gupta, U Garg, JT Matta, D Patel, T Peach, J Hoffman, K Yoshida, M Itoh, M Fujiwara, K Hara, H Hashimoto, K Nakanishi, M Yosoi, H Sakaguchi, S Terashima, S Kishi, T Murakami, M Uchida, Y Yasuda, H Akimune, T Kawabata, MN Harakeh
Phys. Let. B 748 343 2015.11
Joint Work
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Splitting of ISGMR strength in the light-mass nucleus Mg-24 due to ground-state deformation
Y. K. Gupta, U. Garg, J. T. Matta, D. Patel, T. Peach, J. Hoffman, K. Yoshida, M. Itoh, M. Fujiwara, K. Hara, H. Hashimoto, K. Nakanishi, M. Yosoi, H. Sakaguchi, S. Terashima, S. Kishi, T. Murakami, M. Uchida, Y. Yasuda, H. Akimune, T. Kawabata, M. N. Harakeh
PHYSICS LETTERS B 748 343 - 346 2015.9
Joint Work
Publisher:ELSEVIER SCIENCE BV
The isoscalar giant monopole resonance (ISGMR) strength distribution in Mg-24 has been determined from background-free inelastic scattering of 386-MeV alpha particles at extreme forward angles, including 0 degrees The ISGMR strength distribution has been observed for the first time to have a two-peak structure in a light-mass nucleus. This splitting of ISGMR strength is explained well by microscopic theory in terms of the prolate deformation of the ground state of Mg-24. (C) 2015 The Authors. Published by Elsevier B.V.
DOI: 10.1016/j.physletb.2015.07.021
Other Link: http://orcid.org/0000-0001-5237-5718
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D. Frekers, T. Adachi, H. Akimune, M. Alanssari, B. A. Brown, B. T. Cleveland, H. Ejiri, H. Fujita, Y. Fujita, M. Fujiwara, V. N. Gavrin, M. N. Harakeh, K. Hatanaka, M. Holl, C. Iwamoto, A. Lennarz, A. Okamoto, H. Okamura, T. Suzuki, A. Tamii
PHYSICAL REVIEW C 91 ( 3 ) 34608 2015.3
Joint Work
Publisher:AMER PHYSICAL SOC
A precision measurement of the Ga-71(He-3,t)Ge-71 charge-exchange reaction was performed. By using a rather complete set of theoretical form factors to describe the cross-section angular distributions over a large angular range, the Gamow-Teller strength distribution up to the effective neutron-separation energy in Ge-71 was extracted. The data and the analysis constrain the Ga-71(nu(e),e(-)) solar neutrino rate in a neutrino nonoscillation scenario. For nonoscillating neutrinos we report a solar neutrino capture rate of 122.4 +/- 3.4(stat) +/- 1.1(sys) SNU, which is lower than the presently accepted value of 132 +/- 18 SNU, though not in disagreement given the quoted errors.
DOI: 10.1103/PhysRevC.91.034608
Other Link: http://orcid.org/0000-0001-5237-5718
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Gupta Y.K, Garg U, Matta J.T, Patel D, Peach T, Hoffman J, Yoshida K, Itoh M, Fujiwara M, Hara K, Hashimoto H, Nakanishi K, Yosoi M, Sakaguchi H, Terashima S, Kishi S, Murakami T, Uchida M, Yasuda Y, Akimune H, Kawabata T, Harakeh M.N.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 751 597 2015
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I. Ou, Y. Yamada, T. Mori, T. Yano, M. Sakuda, A. Tamii, T. Suzuki, M. Yosoi, N. Aoi, E. Ideguchi, T. Hashimoto, K. Miki, T. Ito, C. Iwamoto, T. Yamamoto, H. Akimune
NUINT12: 8TH INTERNATIONAL WORKSHOP ON NEUTRINO-NUCLEUS INTERACTIONS IN THE FEW-GEV REGION 1663 2015
Joint Work
Publisher:AMER INST PHYSICS
We propose to measure the gamma-ray emission probability from excited states above 5 MeV including giant resonance of O-16 and C-12 as a function of excitation energy in 1-MeV step. Here, we measure both the excitation energy (E-x=5-30MeV) at the forward scattering angles (0 degrees-3 degrees) of the O-16, C-12 (p, p') reaction using Grand-Raiden Spectrometer and the energy of gamma-rays (E,) using an array of NaI(Tl) counters. The purpose of the experiment is to provide the basic and important information not only for the gamma-ray production from primary neutral-current neutrino-oxygen (-carbon) interactions but also for that from the secondary hadronic (neutron-oxygen and -carbon) interactions.
DOI: 10.1063/1.4919518
Other Link: http://orcid.org/0000-0001-5237-5718