Papers - AKIMUNE Hidetoshi
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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