論文 - 秋宗 秀俊
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Extraction of weak transition strengths via the (He-3, t) reaction at 420 MeV
R. G. T. Zegers, T. Adachi, H. Akimune, Sam M. Austin, A. M. van den Berg, B. A. Brown, Y. Fujita, M. Fujiwara, S. Gales, C. J. Guess, M. N. Harakeh, H. Hashimoto, K. Hatanaka, R. Hayami, G. W. Hitt, M. E. Howard, M. Itoh, T. Kawabata, K. Kawase, M. Kinoshita, M. Matsubara, K. Nakanishi, S. Nakayama, S. Okumura, T. Ohta, Y. Sakemi, Y. Shimbara, Y. Shimizu, C. Scholl, C. Simenel, Y. Tameshige, A. Tamii, M. Uchida, T. Yamagata, M. Yosoi
PHYSICAL REVIEW LETTERS 99 ( 20 ) 202501 2007年11月
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出版者・発行元:AMER PHYSICAL SOC
Differential cross sections for transitions of known weak strength were measured with the (He-3, t) reaction at 420 MeV on targets of C-12, C-13, O-18, Mg-26, Ni-58, Ni-60, Zr-90, Sn-118, Sn-120, and Pb-208. Using these data, it is shown that the proportionalities between strengths and cross sections for this probe follow simple trends as a function of mass number. These trends can be used to confidently determine Gamow-Teller strength distributions in nuclei for which the proportionality cannot be calibrated via beta-decay strengths. Although theoretical calculations in the distorted-wave Born approximation overestimate the data, they allow one to understand the main experimental features and to predict deviations from the simple trends observed in some of the transitions.
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T. Li, U. Garg, Y. Liu, R. Marks, B. K. Nayak, P. V.Madhusudhana Rao, M. Fujiwara, H. Hashimoto, K. Kawase, K. Nakanishi, S. Okumura, M. Yosoi, M. Itoh, M. Ichikawa, R. Matsuo, T. Terazono, M. Uchida, T. Kawabata, H. Akimune, Y. Iwao, T. Murakami, H. Sakaguchi, S. Terashima, Y. Yasuda, J. Zenihiro, M. N. Harakeh
Physical Review Letters 99 ( 16 ) 162503 2007年10月
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The strength distributions of the giant monopole resonance (GMR) have been measured in the even-A Sn isotopes (A=112-124) with inelastic scattering of 400-MeV α particles in the angular range 0°-8.5°. We find that the experimentally observed GMR energies of the Sn isotopes are lower than the values predicted by theoretical calculations that reproduce the GMR energies in Pb208 and Zr90 very well. From the GMR data, a value of Kτ=- 550±100MeV is obtained for the asymmetry term in the nuclear incompressibility. © 2007 The American Physical Society.
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Three-body cluster state in B-11
T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi
NUCLEAR PHYSICS A 790 ( 1-4 ) 290C - 293C 2007年6月
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出版者・発行元:ELSEVIER SCIENCE BV
The cluster structures of the excited states in B-11 are studied by analyzing the isoscalar monopole and quadrupole strengths in the B-11(d,d') reaction at E-d = 200 MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2(3)(-) state at E-x = 8.56 MeV is well described by the AMD calculation and is an evidence for a developed three-body 2 alpha + t cluster structure.
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The Giant Monopole Resonance in the Sn Isotopes: Why is Tin so "Fluffy"?
U. Garg, T. Li, S. Okumura, H. Akimune, M. Fujiwara, M. N. Harakeh, H. Hashimoto, M. Itoh, Y. Iwao, T. Kawabata, K. Kawase, Y. Liu, R. Marks, T. Murakami, K. Nakanishi, B. K. Nayak, P. V. Madhusudhana Rao, H. Sakaguchi, Y. Terashima, M. Uchida, Y. Yasuda, M. Yosoi, J. Zenihiro
Nuclear Physics A 788 ( 1-4 ) 36 - 43 2007年5月
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The isoscalar giant monopole resonance (GMR) has been investigated in a series of Sn isotopes (A=112-124) using inelastic scattering of 400-MeV α particles at extremely forward angles (including 0°). The primary aim of the investigation has been to explore the role of the "symmetry-energy" term in the expression for nuclear incompressibility. It is found that the excitation energies of the GMR in the Sn isotopes are significantly lower than those expected from the nuclear incompressibility previously extracted from the available data on the compressional-mode giant resonances. © 2007 Elsevier B.V. All rights reserved.
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Dilute 2 alpha+t cluster structure in B-11
T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi
NUCLEAR PHYSICS A 788 ( 1-4 ) 301C - 306C 2007年5月
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出版者・発行元:ELSEVIER SCIENCE BV
The cluster structures of the excited states in B-11 are studied by analyzing the isoscalar monopole and quadrupole strengths in the B-11(d,d') reaction at Ed = 200 MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the 3/2(3)(-) state at E-x = 8.56 MeV is well described by the AMD calculation and is an evidence for a developed 2 alpha + t cluster structure.
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2 alpha + t cluster structure in B-11
T. Kawabata, H. Akimune, H. Fujita, Y. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, M. Itoh, Y. Kanada-En'yo, S. Kishi, K. Nakanishi, H. Sakaguchi, Y. Shimbara, A. Tamii, S. Terashima, M. Uchida, T. Wakasa, Y. Yasuda, H. P. Yoshida, M. Yosoi
PHYSICS LETTERS B 646 ( 1 ) 6 - 11 2007年3月
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出版者・発行元:ELSEVIER SCIENCE BV
The cluster structures of the excited states in B-11 are studied by analyzing the isoscalar monopole and quadrupole strengths in the (11)(d,d') reaction at E-d = 200 MeV. The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. The large monopole strength for the 3/2(3)(-) state at E-x = 8.56 MeV is well described by the AMD calculation and is suggested to be an evidence for a well developed 2 alpha + t cluster structure. (c) 2007 Elsevier B.V. All rights reserved.
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Matsumoto E, Nakayama S, Hayami R, Fushimi K, Kawasuso H, Yasuda K, Yamagata T, Akimune H, Ikemizu H, Fujiwara M, Yosoi M, Nakanishi K, Kawase K, Hashimoto H, Oota T, Sagara K, Kudoh T, Asaji S, Ishida T, Tanaka M, Greenfield M.B.
AIP Conference Proceedings 891 427 - 430 2007年
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Excitation and charged particle decay of dipole resonance analogs in the α Clusters of6Li and7Li
Yamagata T, Akimune H, Nakayama S, Fujiwara M, Fushimi K, Greenfield M.B, Hara K, Hara K.Y, Hashimoto K, Ichihara K, Ikemizu H, Kawase K, Kinoshita M, Matsui Y, Nakanishi K, Ohta M, Sakama M, Tanaka M, Utsunomiya H, Warashina N, Yosoi M.
AIP Conference Proceedings 891 214 - 221 2007年
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Measurement of the γ→p→K+Λ reaction at backward angles
Hicks K, Mibe T, Sumihama M, Ahn D.S, Ahn J.K, Akimune H, Asano Y, Chang W.C, Dat{\'e} S, Ejiri H, Fukui S, Fujimura H, Fujiwara M, Hasegawa S, Hosaka A, Hotta T, Imai K, Ishikawa T, Iwata T, Juli{\'a}-D{\'i}az B, Kato Y, Kawai H, Kim Z.Y, Kino K, Kohri H, Kumagai N, Lee T.-S.H, Makino S, Matsuda T, Matsumura T, Matsuoka N, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Nakano T, Niiyama M, Nomachi M, Ohashi Y, Ooba T, Ohkuma H, Oshuev D.S, Ozaki S, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin P.M, Shiino Y, Shimizu A, Shimizu H, Sugaya Y, Toi Y, Toyokawa H, Wakai A, Wang C.W, Wang S.C, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers R.G.T.
Physical Review C - Nuclear Physics 76 ( 4 ) 2007年
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The (t, 3He) and (3He, t) reactions as probes of Gamow-Teller strength
秋宗 秀俊
Phys.Rev. C 74, 024309 (2006) 2006年11月
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Measurement of the Gamow-Teller strength distribution in 58Co via the 58Ni(t, 3He) reaction at 115 MeV/nucleon
秋宗 秀俊
Phys.Rev. C 74, 034333 2006年11月
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Partial Photoneutron Cross Sections for the Isomeric State 180Tam
秋宗 秀俊
Phys.Rev.Lett. 96, 192501 2006年11月
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Bi-modal isoscalar giant dipole strength in 58Ni
秋宗 秀俊
Phys.Lett. B 637, 43 2006年11月
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Photoneutron cross section measurements on the N = 82 nuclei 139La and 141Pr: Implications for p-process nucleosynthesis
秋宗 秀俊
Phys.Rev. C 74, 025806 2006年11月
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Excitation of dipole resonances in 4He and in the α clusters of 6Li and 7Li
秋宗 秀俊
Phys.Rev. C 74, 014309 2006年11月
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The (t, $^{3}$He) and ($^{3}$He, t) reactions as probes of Gamow-Teller strength 査読あり
R. G. T. Zegers, H. Akimune, S. M. Austin, D. Bazin, A. M. van den Berg, G. P. A. Berg, B. A. Brown, J. Brown, A. L. Cole, I. Daito, Y. Fujita, M. Fujiwara, S. Gales, M. N. Harakeh, H. Hashimoto, R. Hayami, G. W. Hitt, M. E. Howard, M. Itoh, J. Janecke, T. Kawabata, K. Kawase, M. Kinoshita, T. Nakamura, K. Nakanishi, S. Nakayama, S. Okumura, W. A. Richter, D. A. Roberts, B. M. Sherrill, Y. Shimbara, M. Steiner, M. Uchida, H. Ueno, T. Yamagata, M. Yosoi
Phys.Rev. C 74 24309 2006年11月
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Measurement of the Gamow-Teller strength distribution in $^{58}$Co via the $^{58}$Ni(t, $^{3}$He) reaction at 115 MeV / nucleon 査読あり
A. L. Cole, H. Akimune, S. M. Austin, D. Bazin, A. M. van den Berg, G. P. A. Berg, J. Brown, I. Daito, Y. Fujita, M. Fujiwara, S. Gupta, K. Hara, M. N. Harakeh, J. Janecke, T. Kawabata, T. Nakamura, D. A. Roberts, B. M. Sherrill, M. Steiner, H. Ueno, R. G. T. Zegers
Phys.Rev. C 74 34333 2006年11月
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Partial Photoneutron Cross Sections for the Isomeric State $^{180}$Ta$^{m}$ 査読あり
S. Goko, H. Utsunomiya, S. Goriely, A. Makinaga, T. Kaihori, S. Hohara, H. Akimune, T. Yamagata, Y. -W. Lui, H. Toyokawa, A. J. Koning, S. Hilaire
Phys.Rev.Lett. 96 192501 2006年11月
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Photoneutron cross section measurements on the N = 82 nuclei $^{139}$La and $^{141}$Pr: Implications for p-process nucleosynthesis 査読あり
H. Utsunomiya, A. Makinaga, S. Goko, T. Kaihori, H. Akimune, T. Yamagata, M. Ohta, H. Toyokawa, S. Muller, Y. -W. Lui, S. Goriely
Phys.Rev. C 74 25806 2006年11月
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Excitation of dipole resonances in $^{4}$He and in the $\alpha$ clusters of $^{6}$Li and $^{7}$Li 査読あり
T. Yamagata, N. Warashina, H. Akimune, S. Asaji, M. Fujiwara, M. B. Greenfield, H. Hashimoto, R. Hayami, T. Ishida, K. Kawase, M. Kinoshita, T. Kudoh, K. Nakanishi, S. Nakayama, S. Okumura, K. Sagara, M. Tanaka, H. Utsunomiya, M. Yosoi
Phys.Rev. C 74 14309 2006年11月
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