Papers - AKIMUNE Hidetoshi
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Search for the K− pp bound state via γd→ K+ π− X reaction at Eγ= 1.5–2.4 GeV Reviewed
LEPS Collaboration, H.Akimune
Phys. Lett. B 728 616 2014.11
Joint Work
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Excitation of giant monopole resonance in 208 Pb and 116 Sn using inelastic deuteron scattering Reviewed
D Patel, U Garg, M Itoh, H Akimune, GPA Berg, M Fujiwara, MN Harakeh, C Iwamoto, T Kawabata, K Kawase, JT Matta, T Murakami, A Okamoto, T Sako, KW Schlax, F Takahashi, M White, M Yosoi
Phys. Lett. B 735 378 2014.11
Joint Work
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Partial Photoneutron Cross Sections for 207,208 Pb Reviewed
T. Kondo, H. Utsunomiya, S. Goriely, C Iwamoto, H Akimune, Tamio Yamagata, Hiroyuki Toyokawa, H Harada, Fumito Kitatani, Y-W Lui, Stéphane Hilaire, Arjan J Koning
Nuclear Data Sheets 119 310 2014.11
Joint Work
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Development of high intensity laser-electron photon beams up to 2.9 GeV at the SPring-8 LEPS beamline Reviewed
N Muramatsu, Y Kon, S Daté, Y Ohashi, H Akimune, JY Chen, M Fujiwara, S Hasegawa, T Hotta, T Ishikawa, T Iwata, Y Kato, H Kohri, T Matsumura, T Mibe, Y Miyachi, Y Morino, T Nakano, Y Nakatsugawa, H Ohkuma, T Ohta, M Oka, T Sawada, A Wakai, K Yonehara, CJ Yoon, T Yorita, M Yosoi, LEPS Collaboration
Nucl. Inst Meth. A 737 184 2014.11
Joint Work
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Excitation of giant monopole resonance in Pb-208 and Sn-116 using inelastic deuteron scattering
D. Patel, U. Garg, M. Itoh, H. Akimune, G. P. A. Berg, M. Fujiwara, M. N. Harakeh, C. Iwamoto, T. Kawabata, K. Kawase, J. T. Matta, T. Murakami, A. Okamoto, T. Sako, K. W. Schlax, F. Takahashi, M. White, M. Yosoi
PHYSICS LETTERS B 735 387 - 390 2014.7
Joint Work
Publisher:ELSEVIER SCIENCE BV
The excitation of the isoscalar giant monopole resonance (ISGMR) in Pb-208 and Sn-116 has been investigated using small-angle (including 0 degrees) inelastic scattering of 100 MeV/u deuteron and multipole-decomposition analysis (MDA). The extracted strength distributions agree well with those from inelastic scattering of 100 MeV/u alpha particles. These measurements establish deuteron inelastic scattering at E-d similar to 100 MeV/u as a suitable probe for extraction of the ISGMR strength with MDA, making feasible the investigation of this resonance in radioactive isotopes in inverse kinematics. (C) 2014 The Authors. Published by Elsevier B.V.
DOI: 10.1016/j.physletb.2014.06.073
Other Link: http://orcid.org/0000-0001-5237-5718
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N. Muramatsu, Y. Kon, S. Date, Y. Ohashi, H. Akimune, J. Y. Chen, M. Fujiwara, S. Hasegawa, T. Hotta, T. Ishikawa, T. Iwata, Y. Kato, H. Kohri, T. Matsumura, T. Mibe, Y. Miyachi, Y. Morino, T. Nakano, Y. Nakatsugawa, H. Ohkuma, T. Ohta, M. Oka, T. Sawada, A. Wakai, K. Yonehara, C. J. Yoon, T. Yorita, M. Yosoi
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 737 184 - 194 2014.2
Joint Work
Publisher:ELSEVIER SCIENCE BV
A laser-Compton backscattering beam, which we call a 'Laser-Electron Photon' beam, was upgraded at the LEPS beamline of SPring-8. We accomplished the gains in backscattered photon beam intensities by factors of 1.5-1.8 with the injection of two adjacent laser beams or a higher power laser beam into the storage ring. The maximum energy of the photon beam was also extended from 2.4 GeV to 2.9 GeV with deep-ultraviolet lasers. The upgraded beams have been utilized for hadron photoproduction experiments at the LEPS beamline. Based on the developed methods, we plan he simultaneous injection of four high power laser beams at the LEPS2 beamline, which has been newly constructed at SPring-8. As a simulation result we expect an order of magnitude higher intensities close to 10(7) s(-1) and 10(6) s(-1) for tagged photons up to 2.4 GeV and 2.9 GeV, respectively. (C) 2013 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.nima.2013.11.039
Other Link: http://orcid.org/0000-0001-5237-5718
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Search for the K-pp bound state via gamma d -> K+pi X- reaction at E-gamma=1.5-2.4 GeV
A. O. Tokiyasu, M. Niiyama, J. D. Parker, D. S. Ahn, J. K. 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, D. L. Lin, Y. Maeda, S. Makino, T. Matsuda, T. Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, M. Miyachi, N. Muramatsu, R. Murayama, T. Nakano, Y. Nakatsugawa, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ohta, T. Ooba, D. S. Oshuev, C. Rangacharyulu, S. Y. Ryu, A. Sakaguchi, T. Sawada, P. M. Shagin, Y. Shiino, H. Shimizu, E. A. Strokovsky, Y. Sugaya, M. Sumihama, J. L. Tang, 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
PHYSICS LETTERS B 728 616 - 621 2014.1
Joint Work
Publisher:ELSEVIER SCIENCE BV
A search for the K- pp bound state (the lightest kaonic nucleus) has been performed using the gamma d > K+pi X- reaction at E-gamma= 1.5-2.4 GeV at LEPS/SPring-8. The differential cross section of the K+pi(-) photo-production off deuterium (d(2)sigma/d cos theta(lab)(K+)/d cos theta(lab)(pi-)) has been measured for the first time in this energy region. A peak structure was searched for in the inclusive missing mass spectrum. A statistically significant peak structure was not observed in the region from 2.22 to 2.36 GeV/c(2). The upper limits of the differential cross section of the K- pp bound state production were determined to be (0.17-0.55), (0.55-1.7) and (1.1-2.9) mu b at 95% confidence level with the assumed widths of 20 MeV, 60 MeV and 100 MeV. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved,
DOI: 10.1016/j.physletb.2013.12.039
Other Link: http://orcid.org/0000-0001-5237-5718
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Cluster structure of broad resonances near threshold in 12C and 16O
Itoh M, Akimune H, Fujiwara M, Garg U, Hashimoto H, Kawabata T, Kawase K, Kishi S, Murakami T, Nakanishi K, Nakatsugawa Y, Nayak B.K, Sakaguchi H, Terashima S, Uchida M, Yasuda Y, Yosoi M, Zenihiro J.
Journal of Physics: Conference Series 569 ( 1 ) 2014
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Feasibility study to search for the rare γ-decay mode in 12C
Tsumura M, Kawabata T, Adachi S, Baba T, Furuno T, Ishii Y, Murata M, Kobayashi F, Kanada-En{'}Yo Y, Tamii A, Hashimoto T, Hatanaka K, Matsuda Y, Miki K, Iwamoto C, Ito T, Miura M, Zenihiro J, Kubono S, Itoh M, Ando S, Maeda Y, Sakaguchi S, Akimune H, Fujimura H, Ou I.
Journal of Physics: Conference Series 569 ( 1 ) 2014
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Pygmy Dipole Resonance and Dipole Polarizability in Zr-90
C. Iwamoto, A. Tamii, H. Utsunomiya, H. Akimune, H. Nakada, T. Shima, T. Hashimoto, T. Yamagata, T. Kawabata, Y. Fujita, H. Matsubara, T. Suzuki, H. Fujita, Y. Shimbara, M. Nagashima, M. Sakuda, T. Mori, T. Izumi, A. Okamoto, T. Kondo, T. -W. Lui, B. Bilgier, H. C. Kozer, K. Hatanaka
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2013 1594 426 - 431 2014
Joint Work
Publisher:AMER INST PHYSICS
Electric dipole (El) reduced transition probability B(El) of Zr-90 was obtained by the inelastic proton scattering near 0 degrees using a 295 MeV proton beam and multipole decomposition analysis of the angular distribution by the distorted-wave Born approximation with the Hartree-Fock plus random-phase approximation model and inclusion of El Coulomb excitation, and the El strength of the pygmy dipole resonance was found in the vicinity of the neutron threshold in the low-energy tail of the giant dipole resonance. Using the data, we plan to determine the precise dipole polarizability alpha(D) which is defined as an inversely energy-weighted sum value of the elecrric dipole strength. The dipole polarizability is expected to constrain the symmetry energy term of the neutron matter equation of state. Thus systematical measurement of the dipole polarizability is important.
DOI: 10.1063/1.4874105
Other Link: http://orcid.org/0000-0001-5237-5718
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Isoscalar giant resonance strengths in 32S and possible excitation of superdeformed and 28Si + α cluster bandheads Reviewed
M. Itoh, S. Kishi, H. Sakaguchi, H. Akimune, M. Fujiwara, U. Garg, K. Hara, H. Hashimoto, J. Hoffman, T. Kawabata, K. Kawase, T. Murakami, K. Nakanishi, B. K. Nayak, S. Terashima, M. Uchida, Y. Yasuda, and M. Yosoi
PHys. Rev. C 88 064313 2013.12
Single Work
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M. Itoh, S. Kishi, H. Sakaguchi, H. Akimune, M. Fujiwara, U. Garg, K. Hara, H. Hashimoto, J. Hoffman, T. Kawabata, K. Kawase, T. Murakami, K. Nakanishi, B. K. Nayak, S. Terashima, M. Uchida, Y. Yasuda, M. Yosoi
Physical Review C - Nuclear Physics 88 ( 6 ) 64313 2013.12
Joint Work
Isoscalar giant resonances and low spin states in 32S have been measured with inelastic α scattering at extremely forward angles including zero degrees at Eα=386 MeV. By applying multipole decomposition analysis, various excited states are classified according to their spins and parities (Jπ), and are discussed in relation to the superdeformed and 28Si + α cluster bands. © 2013 American Physical Society.
DOI: 10.1103/PhysRevC.88.064313
Other Link: http://orcid.org/0000-0001-5237-5718
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Isospin mixing of the isobaric analog state studied in a high-resolution 56Fe(3He,t)56Co reaction Reviewed
H. Fujita, Y. Fujita, T. Adachi, H. Akimune, N. T. Botha, K. Hatanaka, H. Matsubara, K. Nakanishi, R. Neveling, A. Okamoto, Y. Sakemi, T. Shima, Y. Shimizu, F. D. Smit, T. Suzuki, A. Tamii, and M. Yosoi
Phys. Rev. C 88 054329 2013.10
Joint Work
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Isospin mixing of the isobaric analog state studied in a high-resolution 56Fe(3He,t)56Co reaction
H. Fujita, Y. Fujita, T. Adachi, H. Akimune, N. T. Botha, K. Hatanaka, H. Matsubara, K. Nakanishi, R. Neveling, A. Okamoto, Y. Sakemi, T. Shima, Y. Shimizu, F. D. Smit, T. Suzuki, A. Tamii, M. Yosoi
Phys. Rev. C 88 ( 5 ) 54329 2013.10
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"Testing the mutually enhanced magicity effect in nuclear incompressibility via the giant monopole resonance in the 204,206,208Pb isotopes " Reviewed
D.Patel, U.Garg, M.Fujiwara, T.Adachi, H.Akimune, G.P.A.Berg, M.N.Harakeh, M.Itoh, C.Iwamoto, A.Long, J.T.Matta, T.Murakami, A.Okamoto, K.Sault, R.Talwar, M.Uchida, M.Yosoi
Phys. Lett. B 726 178 2013.10
Joint Work
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D. Patel, U. Garg, M. Fujiwara, T. Adachi, H. Akimune, G. P. A. Berg, M. N. Harakeh, M. Itoh, C. Iwamoto, A. Long, J. T. Matta, T. Murakami, A. Okamoto, K. Sault, R. Talwar, M. Uchida, M. Yosoi
PHYSICS LETTERS B 726 ( 1-3 ) 178 - 181 2013.10
Joint Work
Publisher:ELSEVIER SCIENCE BV
Using inelastic alpha-scattering at extremely forward angles, including 0 degrees, the strength distributions of the isoscalar giant monopole resonance (ISGMR) have been measured in the Pb-204,Pb-206,Pb-208 isotopes in order to examine the proposed mutually enhanced magicity (MEM) effect on the nuclear incompressibility. The MEM effect had been suggested as a likely explanation of the "softness" of nuclear incompressibility observed in the ISGMR measurements in the Sn and Cd isotopes. Our experimental results rule out any manifestation of the MEM effect in nuclear incompressibility and leave the question of the softness of the open-shell nuclei unresolved still. (C) 2013 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.physletb.2013.08.027
Other Link: http://orcid.org/0000-0001-5237-5718
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Photoneutron cross sections for Mo isotopes: A step toward a unified understanding of (γ,n) and (n,γ) reactions Reviewed
H. Utsunomiya, S. Goriely, T. Kondo, C. Iwamoto, H. Akimune, T. Yamagata, H. Toyokawa, H. Harada, F. Kitatani, Y.-W. Lui, A. C. Larsen, M. Guttormsen, P. E. Koehler, S. Hilaire, S. Péru, M. Martini, and A. J. Koning
Phys. Rev. C 88 015805 2013.7
Joint Work
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H. Utsunomiya, S. Goriely, T. Kondo, C. Iwamoto, H. Akimune, T. Yamagata, H. Toyokawa, H. Harada, F. Kitatani, Y. -W. Lui, A. C. Larsen, M. Guttormsen, P. E. Koehler, S. Hilaire, S. Peru, M. Martini, A. J. Koning
PHYSICAL REVIEW C 88 ( 1 ) 15805 2013.7
Joint Work
Publisher:AMER PHYSICAL SOC
Photoneutron cross sections were measured for Mo-94, Mo-95, Mo-96, Mo-97, Mo-98, and Mo-100 near the neutron threshold with quasi-monochromatic laser-Compton scattering gamma rays. The photoneutron data were analyzed with the Skyrme Hartree-Fock-Bogoliubov (HFB) plus quasiparticle random phase approximation (QRPA) model and the axially symmetric-deformed Gogny HFB plus QRPA model of E1 gamma-ray strength. Combining the gamma-ray strength function constrained by the present photoneutron data with either the nuclear resonance fluorescence data or the updated Oslo data to supplement the data below the neutron threshold, a thorough analysis of the reverse (n,gamma) cross sections is made whenever measurements are available. The Oslo data and the corresponding uncertainties are updated based on the latest results of the s-wave neutron spacing and the average radiative width determined in particular for Mo-96. Finally, radiative neutron capture cross sections for two radioactive nuclei, Mo-93 and Mo-99, are deduced with the gamma-ray strength function method.
DOI: 10.1103/PhysRevC.88.015805
Other Link: http://orcid.org/0000-0001-5237-5718
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Development of a 12 parabola observation system to detect Molecular Bremsstrahlung Radiation from air-showers
T. Yamamoto1, S. Ogio2, H. Akimune3, T. Fujii4, N. Sakurai5, M. Fukushima6 and H. Sagawa6
AIP Conf. Proc. 1536 229 2013.6
Joint Work
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Alpha cluster structure in 56Ni Reviewed
H Akimune1, M Fujiwara2, J Gibelin3, M N Harakeh4, L Achouri3, S Bagchi4, B Bastin5, K Boretzky12, H Bouzomita5, L Caceres5, S Damoy5, F Delaunay3, B Fernández-Domínguez3,14, M Caamano8, U Garg9, G F Grinyer5, N Kalantar-Nayestanaki4, O Kamalou5, E Khan6, A Krasznahorkay10, G Lhoutellier3, S Lukyanov13, K Mazurek11, M Najafi4, J Pancin5, Y Penionzkhevich13, L Perrot6, R Raabe7, C E Rigollet4, T Roger5, S Sambi7, H Savajols5, M Senoville3, C Stodel5, L Suen5, J C Thomas5, J van de Walle4 and M Vandebrouck6
Jou. of Phys. 436 012010 2013
Joint Work