Papers - AKIMUNE Hidetoshi
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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
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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