Papers - AKIMUNE Hidetoshi
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Itoh M, Akimune H, Fujiwara M, Garg U, Kawabata T, Kawase K, Murakami T, Nakanishi K, Nakatsugawa Y, Sakaguchi H, Terashima S, Uchida M, Yasuda Y, Yosoi M, Zenihiro J.
Journal of Physics: Conference Series 436 ( 1 ) 2013
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Yamamoto T, Akimune H, Fukushima M, Matthews J.N, Ogio S, Ohota I, Sagawa H, Sako T, Sakurai N, Shibata T
Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 2013-October 2013
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Ogio S, Yamamoto T, Kuramoto K, Iijima T, Akimune H, Fujii T, Sakurai N, Fukushima M, Sagawa H
Journal of Physics: Conference Series 409 ( 1 ) 2013
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Shoichi Ogio, Tokonatsu Yamamoto, Kazuyuki Kuramoto, Takashi Iijima, Hidetoshi Akimune, Toshihiro Fujii, Nobuyuki Sakurai, Masaki Fukushima, Hiroyuki Sagawa
UHECR 2012 - INTERNATIONAL SYMPOSIUM ON FUTURE DIRECTIONS IN UHECR PHYSICS 53 2013
Joint Work
Publisher:E D P SCIENCES
Microwave radiation from extensive air showers is expected to provide a new technique to observe UHECR. We insatlled and operate radio telescopes in Osaka and at Telescope Array site in Utah, USA. In Osaka, we are coincidentally operating two Ku band radio telescopes with an air shower array which consists of nine plastic scintillators with about 10 m separation. In Utah, we installed two telescopes just beside the Black Rock Mesa fluorescence detector (FD) station of the Telescope Array experiment, and we operated the radio telescopes coincidentally with FD event triggers. We report the experimental setups and the results of these measurements.
DOI: 10.1051/epjconf/20135308007
Other Link: http://orcid.org/0000-0001-5237-5718
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Alpha cluster structure in 56Ni
H Akimune, M Fujiwara, J Gibelin, M N Harakeh, L Achouri, S Bagchi, B Bastin, K Boretzky, H Bouzomita, L Caceres, S Damoy, F Delaunay, B Fern_ndez-Dom_nguez, M Caamano, U Garg, G F Grinyer, N Kalantar-Nayestanaki, O Kamalou, E Khan, A Krasznahorkay, G Lhoutellier, S Lukyanov, K Mazurek, M Najafi, J Pancin, Y Penionzkhevich, L Perrot, R Raabe, C E Rigollet, T Roger, S Sambi, H Savajols, M Senoville, C Stodel, L Suen, J C Thomas, J, van de Walle, M Vandebrouck
Jou. of Phys. 436 ( 1 ) 12010 2013
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T. Yamamoto, S. Ogio, H. Akimune, T. Fujii, N. Sakurai, M. Fukushima, H. Sagawa
5TH INTERNATIONAL WORKSHOP ON ACOUSTIC AND RADIO EEV NEUTRINO DETECTION ACTIVITIES (ARENA 2012) 1535 229 - 232 2013
Joint Work
Publisher:AMER INST PHYSICS
Two experiments for the detections of Molecular Bremsstrahlung Radiation (MBR) from air-shower are under development in West Japan, One of these systems consists of 12 parabola antennas. And the other one uses a 45 cm Broadcasting Satellite (BS) antenna in a scintillator array. Both experiments measure 12 GHz radio emission from air-showers. The setup and the status of these experiments will be reported.
DOI: 10.1063/1.4807554
Other Link: http://orcid.org/0000-0001-5237-5718
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D. Patel, U. Garg, M. Fujiwara, H. Akimune, G. P. A. Berg, M. N. Harakeh, M. Itoh, T. Kawabata, K. Kawase, B. K. Nayak, T. Ohta, H. Ouchi, J. Piekarewiczh, M. Uchida, H. P. Yoshida, M. Yosoi
PHYSICS LETTERS B 718 ( 2 ) 447 - 450 2012.12
Joint Work
Publisher:ELSEVIER SCIENCE BV
The isoscalar giant monopole resonance (ISGMR) in even-A Cd isotopes has been studied by inelastic alpha-scattering at 100 MeV/u and at extremely forward angles, including 0 degrees. The asymmetry term in the nuclear incompressibility extracted from the ISGMR in Cd isotopes is found to be K-tau = -555 +/- 75 MeV, confirming the value previously obtained from the Sn isotopes. ISGMR strength has been computed in relativistic RPA using NL3 and FSUGold effective interactions. Both models significantly overestimate the centroids of the ISGMR strength in the Cd isotopes. Combined with other recent theoretical effort, the question of the "softness" of the open-shell nuclei in the tin region remains open still. (C) 2012 Elsevier By. All rights reserved.
DOI: 10.1016/j.physletb.2012.10.056
Other Link: http://orcid.org/0000-0001-5237-5718
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High resolution (He-3,t) experiment on the double-beta decaying nuclei Te-128 and Te-130
P. Puppe, A. Lennarz, T. Adachi, H. Akimune, H. Ejiri, D. Frekers, H. Fujita, Y. Fujita, M. Fujiwara, E. Ganioglu, E. -W. Grewe, K. Hatanaka, R. Hodak, C. Iwamoto, N. T. Khai, A. Okamoto, H. Okamura, P. P. Povinec, G. Susoy, T. Suzuki, A. Tamii, J. H. Thies, M. Yosoi
PHYSICAL REVIEW C 86 ( 4 ) 44603 2012.10
Joint Work
Publisher:AMER PHYSICAL SOC
Gamow-Teller (GT) strength distributions have been investigated in a high-resolution (He-3,t) charge-exchange experiment on the double-beta (beta beta ) decaying nuclei Te-128 and Te-130. The experiment was carried out at the Research Center for Nuclear Physics, Osaka, with a 420-MeV incident He-3 beam and the Grand Raiden magnetic spectrometer. A final-state energy resolution of 35 keV was achieved. The extracted GT strength distributions at low excitation energies in the final nuclei I-128 and I-130 are presented and discussed in the context of the beta beta decay matrix elements for the two tellurium nuclei. The additional neutron pair in Te-130 seems to produce a moderate increase in the fragmentation of the low-energy GT distribution.
DOI: 10.1103/PhysRevC.86.044603
Other Link: http://orcid.org/0000-0001-5237-5718
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M. Freer, M. Itoh, T. Kawabata, H. Fujita, H. Akimune, Z. Buthelezi, J. Carter, R. W. Fearick, S. V. Foertsch, M. Fujiwara, U. Garg, N. Hashimoto, K. Kawase, S. Kishi, T. Murakami, K. Nakanishi, Y. Nakatsugawa, B. K. Nayak, R. Neveling, S. Okumura, S. M. Perez, P. Papka, H. Sakaguchi, Y. Sasamoto, F. D. Smit, J. A. Swartz, H. Takeda, S. Terashima, M. Uchida, I. Usman, Y. Yasuda, M. Yosoi, J. Zenihiro
PHYSICAL REVIEW C 86 ( 3 ) 34320 2012.9
Joint Work
Publisher:AMER PHYSICAL SOC
The C-12 excitation energy spectra populated in both proton and alpha-particle inelastic scattering measurements are examined. The data indicate the existence of a 2(+) state at E-x = 9.75(0.15) MeV with a width of 750(150) keV. It is believed that this state corresponds to the 2(+) excitation of the 7.65 MeV, 0(+), Hoyle state, which acts as the main path by which carbon is synthesized in stars. A simultaneous R-matrix analysis of the two sets of data indicates that the 2(+) state possesses a very large alpha-reduced width, approaching the Wigner limit. This would indicate that the state is associated with a highly clustered structure. The potential geometric arrangements of the clusters is discussed.
DOI: 10.1103/PhysRevC.86.034320
Other Link: http://orcid.org/0000-0001-5237-5718
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Total and partial photoneutron cross sections for Pb isotopes
T. Kondo, H. Utsunomiya, S. Goriely, I. Daoutidis, C. Iwamoto, H. Akimune, A. Okamoto, T. Yamagata, M. Kamata, O. Itoh, H. Toyokawa, Y. -W. Lui, H. Harada, F. Kitatani, S. Hilaire, A. J. Koning
PHYSICAL REVIEW C 86 ( 1 ) 14316 2012.7
Joint Work
Publisher:AMER PHYSICAL SOC
Using quasimonochromatic laser-Compton scattering gamma rays, total photoneutron cross sections were measured for Pb-206,Pb-207,Pb-208 near neutron threshold with a high-efficiency 4 pi neutron detector. Partial E1 and M1 photoneutron cross sections along with total cross sections were determined for Pb-207,Pb-208 at four energies near threshold by measuring anisotropies in photoneutron emission with linearly polarized gamma rays. The E1 strength dominates over the M1 strength in the neutron channel where E1 photoneutron cross sections show extra strength of the pygmy dipole resonance in Pb-207,Pb-208 near the neutron threshold corresponding to 0.32%-0.42% of the Thomas-Reiche-Kuhn sum rule. Several mu(2)(N) units of B(M1) up arrow strength were observed in Pb-207,Pb-208 just above neutron threshold, which correspond to an M1 cross section less than 10% of the total photoneutron cross section.
DOI: 10.1103/PhysRevC.86.014316
Other Link: http://orcid.org/0000-0001-5237-5718
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C. Iwamoto, H. Utsunomiya, A. Tamii, H. Akimune, H. Nakada, T. Shima, T. Yamagata, T. Kawabata, Y. Fujita, H. Matsubara, Y. Shimbara, M. Nagashima, T. Suzuki, H. Fujita, M. Sakuda, T. Mori, T. Izumi, A. Okamoto, T. Kondo, B. Bilgier, H. C. Kozer, Y. -W. Lui, K. Hatanaka
PHYSICAL REVIEW LETTERS 108 ( 26 ) 262501 2012.6
Joint Work
Publisher:AMER PHYSICAL SOC
A high-resolution measurement of inelastic proton scattering off Zr-90 near 0 degrees was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7-12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at E-PDR 9.15 +/- 0.18 MeV with Gamma(PDR) = 2.91 +/- 0.64 MeV and at E-M1 = 9.53 +/- 0.06 MeV with Gamma(M1) = 2.70 +/- 0.17 MeV in the Lorentzian function, respectively. The B(E1) up arrow value for pygmy dipole resonance over 7-11 MeV is 0.75 +/- 0.08 e(2) fm(2), which corresponds to 2.1 +/- 0: 2% of the Thomas-Reiche-Kuhn sum rule.
DOI: 10.1103/PhysRevLett.108.262501
Other Link: http://orcid.org/0000-0001-5237-5718
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Consistent analysis of the 2+ excitation of the 12C Hoyle state populated in proton and α-particle inelastic scattering Reviewed
M.Freer, M.Itoh, T.Kawabata, H.Fujita, H.Akimune, Z.Buthelezi, J.Carter, R.W.Fearick, S.V.Fortsch, M.Fujiwara, U.Garg, N.Hashimoto, K.Kawase, S.Kishi, T.Murakami, K.Nakanishi, Y.Nakatsugawa, B.K.Nayak, R.Neveling, S.Okumura, S.M.Perez, P.Papka, H.Sakaguchi, Y.Sasamoto, F.D.Smit, J.A.Swartz, H.Takeda, S.Terashima, M.Uchida, I.Usman, Y.Yasuda, M.Yosoi, J.Zenihiro
Phys. Rev. C 86 034320 2012
Joint Work
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Separation of Pygmy Dipole and M1 Resonances in 90Zr by a High-Resolution Inelastic Proton Scattering Near 0 degrees Reviewed
C.Iwamoto, H.Utsunomiya, A.Tamii, H.Akimune, H.Nakada, T.Shima, T.Yamagata, T.Kawabata, Y.Fujita, H.Matsubara, Y.Shimbara, M.Nagashima, T.Suzuki, H.Fujita, M.Sakuda, T.Mori, T.Izumi, A.Okamoto, T.Kondo, B.Bilgier, H.C.Kozer, Y.-W.Lui, K.Hatanaka
Phys. Rev. Lett. 108 262501 2012
Joint Work
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High resolution (3He, t)experiment on the double-β decaying nuclei 128Te and 130Te Reviewed
P.Puppe, A.Lennarz, T.Adachi, H.Akimune, H.Ejiri, D.Frekers, H.Fujita, Y.Fujita, M.Fujiwara, E.Ganioglu, E.-W.Grewe, K.Hatanaka, R.Hodak, C.Iwamoto, N.T.Khai, A.Okamoto, H.Okamura, P.P.Povinec, G.Susoy, T.Suzuki, A.Tamii, J.H.Thies, M.Yosoi
Phys. Rev. C 86 044603 2012
Joint Work
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Total and partial photoneutron cross sections for Pb isotopes Reviewed
T.Kondo, H.Utsunomiya, S.Goriely, I.Daoutidis, C.Iwamoto, H.Akimune, A.Okamoto, T.Yamagata, M.Kamata, O.Itoh, H.Toyokawa, Y.-W.Lui, H.Harada, F.Kitatani, S.Hilaire, A.J.Koning
Phys. Rev. C 86 014316 2012
Joint Work
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Giant monopole resonance in even-A Cd isotopes, the asymmetry term in nuclear incompressibility, and the "softness" of Sn and Cd nuclei Reviewed
D.Patel, U.Garg, M.Fujiwara, H.Akimune, G.P.A.Berg, M.N.Harakeh, M.Itoh, T.Kawabata, K.Kawase, B.K.Nayak, T.Ohta, H.Ouchi, J.Piekarewicz, M.Uchida, H.P.Yoshida, M.Yosoi
Phys. Lett. B 718 447 2012
Joint Work
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The Ga-71(He-3, t) reaction and the low-energy neutrino response
D. Frekers, H. Ejiri, H. Akimune, T. Adachi, B. Bilgier, B. A. Brown, B. T. Cleveland, H. Fujita, Y. Fujita, M. Fujiwara, E. Ganioglu, V. N. Gavrin, E. -W. Grewe, C. J. Guess, M. N. Harakeh, K. Hatanaka, R. Hodak, M. Holl, C. Iwamoto, N. T. Khai, H. C. Kozer, A. Lennarz, A. Okamoto, H. Okamura, P. P. Povinec, P. Puppe, F. Simkovic, G. Susoy, T. Suzuki, A. Tamii, J. H. Thies, J. Van de Walle, R. G. T. Zegers
PHYSICS LETTERS B 706 ( 2-3 ) 134 - 138 2011.12
Joint Work
Publisher:ELSEVIER SCIENCE BV
A Ga-71(He-3,t)Ge-71 charge-exchange experiment was performed to extract with high precision the Gamow-Teller (GT) transition strengths to the three lowest-lying states in Ge-71, i.e., the ground state (1/2(-)), the 175 keV (5/2(-)) and the 500 key (3/2(-)) excited states. These are the relevant states, which are populated via a charged-current reaction induced by neutrinos from reactor-produced Cr-51 and Ar-37 sources. A precise measurement of the GT transition strengths is an important input into the calibration of the SAGE and GALLEX solar neutrino detectors and addresses a long-standing discrepancy between the measured and evaluated capture rates from the Cr-51 and Ar-37 neutrino calibration sources, which has recently spawned new ideas about unconventional neutrino properties. (C) 2011 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.physletb.2011.10.061
Other Link: http://orcid.org/0000-0001-5237-5718
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Photoneutron cross sections for Sn118-124 and the gamma-ray strength function method
H. Utsunomiya, S. Goriely, M. Kamata, H. Akimune, T. Kondo, O. Itoh, C. Iwamoto, T. Yamagata, H. Toyokawa, Y. -W. Lui, H. Harada, F. Kitatani, S. Goko, S. Hilaire, A. J. Koning
PHYSICAL REVIEW C 84 ( 5 ) 55805 2011.11
Joint Work
Publisher:AMER PHYSICAL SOC
Photoneutron cross sections were measured for Sn-118, Sn-119, Sn-120, Sn-122, and Sn-124 near neutron threshold with quasi-monochromatic laser-Compton scattering gamma rays. A systematic analysis of the present photoneutron data and existing neutron-capture data is made using the gamma-ray strength function on the basis of the HFB + QRPA model of E1 strength supplemented with a pygmy dipole resonance, which was deduced from a previous study on Sn-116 and Sn-117. Radiative neutron capture cross sections for two radioactive nuclei, Sn-121 and Sn-123, are deduced through the gamma-ray strength function method.
DOI: 10.1103/PhysRevC.84.055805
Other Link: http://orcid.org/0000-0001-5237-5718
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The gamma SF Method - Determination of Radiative Neutron Capture Cross Sections for Unstable Nuclei
H. Utsunomiya, S. Goriely, H. Akimune, H. Harada, F. Kitatani, S. Goko, H. Toyokawa, K. Yamada, Y. -W. Lui
JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 ( 2 ) 1713 - 1716 2011.8
Joint Work
Publisher:KOREAN PHYSICAL SOC
An indirect method of determining radiative neutron-capture cross sections for unstable nuclei which we refer to as the gamma-ray strength function (gamma SF) method is outlined and applied to Zr and Sn isotopes. Photoneutron cross sections for Zr-91,Zr-92,Zr-94,Zr-96 and Sn-117,Sn-116 near neutron threshold show the presence of extra gamma-ray strengths known as giant M1 and pygmy E1 resonances on top of the low-energy gamma SF of GDR. Based on the gamma SF method, we present (n,gamma) cross sections for two radioactive nuclei, a long-lived fission product, Zr-93 with T-1/2= 1.5 x 10(6) y and an s-process branching point nucleus, Zr-95 with T-1/2 = 64.0 d.
DOI: 10.3938/jkps.59.1713
Other Link: http://orcid.org/0000-0001-5237-5718
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Measurement of Se-76 and Se-78 (gamma, n) Cross Sections
Fumito Kitatani, Hideo Harada, Shinji Goko, Hiroaki Utsunomiya, Hidetoshi Akimune, Hiroyuki Toyokawa, Kawakatsu Yamada
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 48 ( 7 ) 1017 - 1024 2011.7
Joint Work
Publisher:TAYLOR & FRANCIS LTD
The (gamma, n) cross sections of Se isotopes (Se-76,Se-78) were measured to supply fundamental data for estimating the inverse reaction cross section, i.e., the Se-79(n, gamma)Se-80 cross section. The enriched samples and a reference Au-197 sample were irradiated with laser-Compton scattering (LCS) gamma-rays. The excitation function of each (gamma, n) cross section was determined for the energy range from each near neutron separation energy to the threshold energy of (gamma, 2n) reaction. The energy point corresponding to each cross section was deduced using the accurately determined energy distribution of LCS gamma-rays. Systematic (gamma, n) cross sections for Se isotopes including 80Se were compared with those calculated by using a statistical model calculation code TALYS.
DOI: 10.1080/18811248.2011.9711787
Other Link: http://orcid.org/0000-0001-5237-5718