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Start Over Author "Dozono M" Journal physical review letters
24 results on '"Dozono M"'

1. Quasifree Neutron Knockout Reaction Reveals a Small s -Orbital Component in the Borromean Nucleus B17

Author

Yang, Z. H., primary, Kubota, Y., additional, Corsi, A., additional, Yoshida, K., additional, Sun, X.-X., additional, Li, J. G., additional, Kimura, M., additional, Michel, N., additional, Ogata, K., additional, Yuan, C. X., additional, Yuan, Q., additional, Authelet, G., additional, Baba, H., additional, Caesar, C., additional, Calvet, D., additional, Delbart, A., additional, Dozono, M., additional, Feng, J., additional, Flavigny, F., additional, Gheller, J.-M., additional, Gibelin, J., additional, Giganon, A., additional, Gillibert, A., additional, Hasegawa, K., additional, Isobe, T., additional, Kanaya, Y., additional, Kawakami, S., additional, Kim, D., additional, Kiyokawa, Y., additional, Kobayashi, M., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kondo, Y., additional, Korkulu, Z., additional, Koyama, S., additional, Lapoux, V., additional, Maeda, Y., additional, Marqués, F. M., additional, Motobayashi, T., additional, Miyazaki, T., additional, Nakamura, T., additional, Nakatsuka, N., additional, Nishio, Y., additional, Obertelli, A., additional, Ohkura, A., additional, Orr, N. A., additional, Ota, S., additional, Otsu, H., additional, Ozaki, T., additional, Panin, V., additional, Paschalis, S., additional, Pollacco, E. C., additional, Reichert, S., additional, Roussé, J.-Y., additional, Saito, A. T., additional, Sakaguchi, S., additional, Sako, M., additional, Santamaria, C., additional, Sasano, M., additional, Sato, H., additional, Shikata, M., additional, Shimizu, Y., additional, Shindo, Y., additional, Stuhl, L., additional, Sumikama, T., additional, Sun, Y. L., additional, Tabata, M., additional, Togano, Y., additional, Tsubota, J., additional, Xu, F. R., additional, Yasuda, J., additional, Yoneda, K., additional, Zenihiro, J., additional, Zhou, S.-G., additional, Zuo, W., additional, and Uesaka, T., additional

Published
2021
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2. Surface Localization of the Dineutron in Li11

Author

Kubota, Y., primary, Corsi, A., additional, Authelet, G., additional, Baba, H., additional, Caesar, C., additional, Calvet, D., additional, Delbart, A., additional, Dozono, M., additional, Feng, J., additional, Flavigny, F., additional, Gheller, J.-M., additional, Gibelin, J., additional, Giganon, A., additional, Gillibert, A., additional, Hasegawa, K., additional, Isobe, T., additional, Kanaya, Y., additional, Kawakami, S., additional, Kim, D., additional, Kikuchi, Y., additional, Kiyokawa, Y., additional, Kobayashi, M., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kondo, Y., additional, Korkulu, Z., additional, Koyama, S., additional, Lapoux, V., additional, Maeda, Y., additional, Marqués, F. M., additional, Motobayashi, T., additional, Miyazaki, T., additional, Nakamura, T., additional, Nakatsuka, N., additional, Nishio, Y., additional, Obertelli, A., additional, Ogata, K., additional, Ohkura, A., additional, Orr, N. A., additional, Ota, S., additional, Otsu, H., additional, Ozaki, T., additional, Panin, V., additional, Paschalis, S., additional, Pollacco, E. C., additional, Reichert, S., additional, Roussé, J.-Y., additional, Saito, A. T., additional, Sakaguchi, S., additional, Sako, M., additional, Santamaria, C., additional, Sasano, M., additional, Sato, H., additional, Shikata, M., additional, Shimizu, Y., additional, Shindo, Y., additional, Stuhl, L., additional, Sumikama, T., additional, Sun, Y. L., additional, Tabata, M., additional, Togano, Y., additional, Tsubota, J., additional, Yang, Z. H., additional, Yasuda, J., additional, Yoneda, K., additional, Zenihiro, J., additional, and Uesaka, T., additional

Published
2020
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3. Mapping of a New Deformation Region Around Ti62

Author

Michimasa, S., primary, Kobayashi, M., additional, Kiyokawa, Y., additional, Ota, S., additional, Yokoyama, R., additional, Nishimura, D., additional, Ahn, D. S., additional, Baba, H., additional, Berg, G. P. A., additional, Dozono, M., additional, Fukuda, N., additional, Furuno, T., additional, Ideguchi, E., additional, Inabe, N., additional, Kawabata, T., additional, Kawase, S., additional, Kisamori, K., additional, Kobayashi, K., additional, Kubo, T., additional, Kubota, Y., additional, Lee, C. S., additional, Matsushita, M., additional, Miya, H., additional, Mizukami, A., additional, Nagakura, H., additional, Oikawa, H., additional, Sakai, H., additional, Shimizu, Y., additional, Stolz, A., additional, Suzuki, H., additional, Takaki, M., additional, Takeda, H., additional, Takeuchi, S., additional, Tokieda, H., additional, Uesaka, T., additional, Yako, K., additional, Yamaguchi, Y., additional, Yanagisawa, Y., additional, Yoshida, K., additional, and Shimoura, S., additional

Published
2020
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4. How Different is the Core of F25 from Og.s.24 ?

Author

Tang, T. L., primary, Uesaka, T., additional, Kawase, S., additional, Beaumel, D., additional, Dozono, M., additional, Fujii, T., additional, Fukuda, N., additional, Fukunaga, T., additional, Galindo-Uribarri, A., additional, Hwang, S. H., additional, Inabe, N., additional, Kameda, D., additional, Kawahara, T., additional, Kim, W., additional, Kisamori, K., additional, Kobayashi, M., additional, Kubo, T., additional, Kubota, Y., additional, Kusaka, K., additional, Lee, C. S., additional, Maeda, Y., additional, Matsubara, H., additional, Michimasa, S., additional, Miya, H., additional, Noro, T., additional, Obertelli, A., additional, Ogata, K., additional, Ota, S., additional, Padilla-Rodal, E., additional, Sakaguchi, S., additional, Sakai, H., additional, Sasano, M., additional, Shimoura, S., additional, Stepanyan, S. S., additional, Suzuki, H., additional, Takaki, M., additional, Takeda, H., additional, Tokieda, H., additional, Wakasa, T., additional, Wakui, T., additional, Yako, K., additional, Yanagisawa, Y., additional, Yasuda, J., additional, Yokoyama, R., additional, Yoshida, K., additional, and Zenihiro, J., additional

Published
2020
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5. Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in Sn132

Author

Yasuda, J., primary, Sasano, M., additional, Zegers, R. G. T., additional, Baba, H., additional, Bazin, D., additional, Chao, W., additional, Dozono, M., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Jhang, G., additional, Kameda, D., additional, Kaneko, M., additional, Kisamori, K., additional, Kobayashi, M., additional, Kobayashi, N., additional, Kobayashi, T., additional, Koyama, S., additional, Kondo, Y., additional, Krasznahorkay, A. J., additional, Kubo, T., additional, Kubota, Y., additional, Kurata-Nishimura, M., additional, Lee, C. S., additional, Lee, J. W., additional, Matsuda, Y., additional, Milman, E., additional, Michimasa, S., additional, Motobayashi, T., additional, Muecher, D., additional, Murakami, T., additional, Nakamura, T., additional, Nakatsuka, N., additional, Ota, S., additional, Otsu, H., additional, Panin, V., additional, Powell, W., additional, Reichert, S., additional, Sakaguchi, S., additional, Sakai, H., additional, Sako, M., additional, Sato, H., additional, Shimizu, Y., additional, Shikata, M., additional, Shimoura, S., additional, Stuhl, L., additional, Sumikama, T., additional, Suzuki, H., additional, Tangwancharoen, S., additional, Takaki, M., additional, Takeda, H., additional, Tako, T., additional, Togano, Y., additional, Tokieda, H., additional, Tsubota, J., additional, Uesaka, T., additional, Wakasa, T., additional, Yako, K., additional, Yoneda, K., additional, and Zenihiro, J., additional

Published
2018
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6. Magic Nature of Neutrons in Ca54 : First Mass Measurements of Ca55–57

Author

Michimasa, S., primary, Kobayashi, M., additional, Kiyokawa, Y., additional, Ota, S., additional, Ahn, D. S., additional, Baba, H., additional, Berg, G. P. A., additional, Dozono, M., additional, Fukuda, N., additional, Furuno, T., additional, Ideguchi, E., additional, Inabe, N., additional, Kawabata, T., additional, Kawase, S., additional, Kisamori, K., additional, Kobayashi, K., additional, Kubo, T., additional, Kubota, Y., additional, Lee, C. S., additional, Matsushita, M., additional, Miya, H., additional, Mizukami, A., additional, Nagakura, H., additional, Nishimura, D., additional, Oikawa, H., additional, Sakai, H., additional, Shimizu, Y., additional, Stolz, A., additional, Suzuki, H., additional, Takaki, M., additional, Takeda, H., additional, Takeuchi, S., additional, Tokieda, H., additional, Uesaka, T., additional, Yako, K., additional, Yamaguchi, Y., additional, Yanagisawa, Y., additional, Yokoyama, R., additional, Yoshida, K., additional, and Shimoura, S., additional

Published
2018
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7. Excitation of the Isovector Spin Monopole Resonance via the Exothermic Zr90(N12,C12) Reaction at 175MeV/u

Author

Noji, S., primary, Sakai, H., additional, Aoi, N., additional, Baba, H., additional, Berg, G. P. A., additional, Doornenbal, P., additional, Dozono, M., additional, Fukuda, N., additional, Inabe, N., additional, Kameda, D., additional, Kawabata, T., additional, Kawase, S., additional, Kikuchi, Y., additional, Kisamori, K., additional, Kubo, T., additional, Maeda, Y., additional, Matsubara, H., additional, Michimasa, S., additional, Miki, K., additional, Miya, H., additional, Miyasako, H., additional, Sakaguchi, S., additional, Sasamoto, Y., additional, Shimoura, S., additional, Takaki, M., additional, Takeda, H., additional, Takeuchi, S., additional, Tokieda, H., additional, Ohnishi, T., additional, Ota, S., additional, Uesaka, T., additional, Wang, H., additional, Yako, K., additional, Yanagisawa, Y., additional, Yokota, N., additional, Yoshida, K., additional, and Zegers, R. G. T., additional

Published
2018
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8. Candidate Resonant Tetraneutron State Populated by theHe4(He8,Be8)Reaction

Author

Kisamori, K., primary, Shimoura, S., additional, Miya, H., additional, Michimasa, S., additional, Ota, S., additional, Assie, M., additional, Baba, H., additional, Baba, T., additional, Beaumel, D., additional, Dozono, M., additional, Fujii, T., additional, Fukuda, N., additional, Go, S., additional, Hammache, F., additional, Ideguchi, E., additional, Inabe, N., additional, Itoh, M., additional, Kameda, D., additional, Kawase, S., additional, Kawabata, T., additional, Kobayashi, M., additional, Kondo, Y., additional, Kubo, T., additional, Kubota, Y., additional, Kurata-Nishimura, M., additional, Lee, C. S., additional, Maeda, Y., additional, Matsubara, H., additional, Miki, K., additional, Nishi, T., additional, Noji, S., additional, Sakaguchi, S., additional, Sakai, H., additional, Sasamoto, Y., additional, Sasano, M., additional, Sato, H., additional, Shimizu, Y., additional, Stolz, A., additional, Suzuki, H., additional, Takaki, M., additional, Takeda, H., additional, Takeuchi, S., additional, Tamii, A., additional, Tang, L., additional, Tokieda, H., additional, Tsumura, M., additional, Uesaka, T., additional, Yako, K., additional, Yanagisawa, Y., additional, Yokoyama, R., additional, and Yoshida, K., additional

Published
2016
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9. Nonquenched Isoscalar Spin-M1Excitations insd-Shell Nuclei

Author

Matsubara, H., primary, Tamii, A., additional, Nakada, H., additional, Adachi, T., additional, Carter, J., additional, Dozono, M., additional, Fujita, H., additional, Fujita, K., additional, Fujita, Y., additional, Hatanaka, K., additional, Horiuchi, W., additional, Itoh, M., additional, Kawabata, T., additional, Kuroita, S., additional, Maeda, Y., additional, Navrátil, P., additional, von Neumann-Cosel, P., additional, Neveling, R., additional, Okamura, H., additional, Popescu, L., additional, Poltoratska, I., additional, Richter, A., additional, Rubio, B., additional, Sakaguchi, H., additional, Sakaguchi, S., additional, Sakemi, Y., additional, Sasamoto, Y., additional, Shimbara, Y., additional, Shimizu, Y., additional, Smit, F. D., additional, Suda, K., additional, Tameshige, Y., additional, Tokieda, H., additional, Yamada, Y., additional, Yosoi, M., additional, and Zenihiro, J., additional

Published
2015
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10. Complete Electric Dipole Response and the Neutron Skin inPb208

Author

Tamii, A., primary, Poltoratska, I., additional, von Neumann-Cosel, P., additional, Fujita, Y., additional, Adachi, T., additional, Bertulani, C. A., additional, Carter, J., additional, Dozono, M., additional, Fujita, H., additional, Fujita, K., additional, Hatanaka, K., additional, Ishikawa, D., additional, Itoh, M., additional, Kawabata, T., additional, Kalmykov, Y., additional, Krumbholz, A. M., additional, Litvinova, E., additional, Matsubara, H., additional, Nakanishi, K., additional, Neveling, R., additional, Okamura, H., additional, Ong, H. J., additional, Özel-Tashenov, B., additional, Ponomarev, V. Yu., additional, Richter, A., additional, Rubio, B., additional, Sakaguchi, H., additional, Sakemi, Y., additional, Sasamoto, Y., additional, Shimbara, Y., additional, Shimizu, Y., additional, Smit, F. D., additional, Suzuki, T., additional, Tameshige, Y., additional, Wambach, J., additional, Yamada, R., additional, Yosoi, M., additional, and Zenihiro, J., additional

Published
2011
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11. Gamow-Teller Strength Distributions inSc48by theCa48(p,n)andTi48(n,p)Reactions and Two-Neutrino Double-βDecay Nuclear Matrix Elements

Author

Yako, K., primary, Sasano, M., additional, Miki, K., additional, Sakai, H., additional, Dozono, M., additional, Frekers, D., additional, Greenfield, M. B., additional, Hatanaka, K., additional, Ihara, E., additional, Kato, M., additional, Kawabata, T., additional, Kuboki, H., additional, Maeda, Y., additional, Matsubara, H., additional, Muto, K., additional, Noji, S., additional, Okamura, H., additional, Okabe, T. H., additional, Sakaguchi, S., additional, Sakemi, Y., additional, Sasamoto, Y., additional, Sekiguchi, K., additional, Shimizu, Y., additional, Suda, K., additional, Tameshige, Y., additional, Tamii, A., additional, Uesaka, T., additional, Wakasa, T., additional, and Zheng, H., additional

Published
2009
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12. Nonquenched Isoscalar Spin-Ml Excitations in srf-Shell Nuclei.

Author

Matsubara, H., Tamii, A., Nakada, H., Adachi, T., Carter, J., Dozono, M., Fujita, H., Fujita, K., Fujita, Y., Hatanaka, K., Horiuchi, W., Itoh, M., Kawabata, T., Kuroita, S., Maeda, Y., Navrátil, P., von Neumann-Cosel, P., Neveling, R., Okamura, H., and Popescu, L.

Subjects
*DIFFERENTIAL cross sections, *PROTON scattering, *NUCLEAR matrix, *ISOBARIC spin, *SPIN excitations, *NUCLEAR excitation
Abstract

Differential cross sections of isoscalar and isovector spin-M1 (P+ → 1+) transitions are measured using high-energy-resolution proton inelastic scattering at Ep = 295 MeV on 24Mg, 28Si, 32S, and 36Ar at 0°-l 4°. The squared spin-M1 nuclear transition matrix elements are deduced from the measured differential cross sections by applying empirically determined unit cross sections based on the assumption of isospin symmetry. The ratios of the squared nuclear matrix elements accumulated up to Ex = 16 MeV compared to a shell-model prediction are 1.01(9) for isoscalar and 0.61(6) for isovector spin-M1 transitions, respectively. Thus, no quenching is observed for isoscalar spin-M1 transitions, while the matrix elements for isovector spin-M1 transitions are quenched by an amount comparable with the analogous Gamow-Teller transitions on those target nuclei. [ABSTRACT FROM AUTHOR]

Published
2015
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13. Complete Electric Dipole Response and the Neutron Skin in 208Pb.

Author

Tamii, A., Poltoratska, I., Neumann-Cose, P. von, Fujita, Y., Adachi, T., Bertulani, C. A., Carter, J., Dozono, M., Fujita, H., Fujita, K., Hatanaka1, K., Ishikawa, D., Itoh, M., Kawabata, T., Kalmykov, Y., Krumbholz, A, M., Litvinova, E., Matsubara, H., Nakanishi, K., and Neveling, R.

Subjects
*NEUTRONS, *PROTONS, *DIPOLE moments, *INELASTIC scattering, *PHYSICS
Abstract

A benchmark experiment on 208Pb shows that polarized proton inelastic scattering at very forward angles including 00 is a powerful tool for high-resolution studies of electric dipole (El) and spin magnetic dipole (MI) modes in nuclei over a broad excitation energy range to test up-to-date nuclear models. The extracted El polarizability leads to a neutron skin thickness rSkin = 0. 156+0.025-0.021 fm in 208Pb derived within a mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars. [ABSTRACT FROM AUTHOR]

Published
2011
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14. Candidate Resonant Tetraneutron State Populated by the 4He(8He,8Be) Reaction.

Author

Kisamori, K., Shimoura, S., Miya, H., Michimasa, S., Ota, S., Assie, M., Baba, H., Baba, T., Beaumel, D., Dozono, M., Fujii, T., Fukuda, N., Go, S., Hammache, F., Ideguchi, E., Inabe, N., Itoh, M., Kameda, D., Kawase, S., and Kawabata, T.

Subjects
*CHARGE exchange reactions, *HELIUM isotopes, *NEUTRONS
Abstract

A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction He4(He8,Be8) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (8He,8Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently. [ABSTRACT FROM AUTHOR]

Published
2016
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15. Precise Spectroscopy of the 3n and 3p Systems via the ^{3}H(t, ^{3}He)3n and ^{3}He(^{3}He, t)3p Reactions at Intermediate Energies.

Author

Miki K, Kameya K, Sakai D, Urayama R, Imai N, Ishikawa S, Michimasa S, Ota S, Sasano M, Takeda H, Uesaka T, Haba H, Hara M, Hatano Y, Hayamizu T, Kobayashi N, Tamii A, Adachi S, Chillery T, Dozono M, Fujikawa Y, Fujita H, Fukuda N, Furuno T, Gao J, Goto S, Hanai S, Hayakawa S, Hijikata Y, Himi K, Hirai Y, Hwang JW, Ichimura M, Inomoto D, Inoue M, Kasahara H, Kawabata T, Kishimoto K, Kitayama S, Kusaka K, Li J, Maeda Y, Maruta Y, Matsui T, Matsuzaki T, Nakai S, Nishibata H, Otake M, Saito Y, Sakai H, Sakaue A, Sato H, Sekiguchi K, Shimizu Y, Shimoura S, Stuhl L, Sumikama T, Suzuki H, Tsuji R, Tsuji S, Umetsu H, Utsuki Y, Wakasa T, Watanabe A, Yako K, Yanagisawa Y, Yokota N, Yonemura C, Yoshida K, and Yoshimoto M

Abstract

To search for low-energy resonant structures in isospin T=3/2 three-body systems, we have performed the experiments ^{3}H(t,^{3}He)3n and ^{3}He(^{3}He,t)3p at intermediate energies. For the 3n experiment, we have newly developed a thick Ti-^{3}H target that has the largest tritium thickness among targets of this type ever made. The 3n experiment for the first time covered the momentum-transfer region as low as 15  MeV/c, which provides ideal conditions for producing fragile systems. However, in the excitation-energy spectra we obtained, we did not observe any distinct peak structures. This is in sharp contrast to tetraneutron spectra. The distributions of the 3n and 3p spectra are found to be similar, except for the displacement in energy due to Coulomb repulsion. Comparisons with theoretical calculations suggest that three-body correlations exist in the 3n and 3p systems, although not enough to produce a resonant peak.

Published
2024
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16. Mass, Spectroscopy, and Two-Neutron Decay of ^{16}Be.

Author

Monteagudo B, Marqués FM, Gibelin J, Orr NA, Corsi A, Kubota Y, Casal J, Gómez-Camacho J, Authelet G, Baba H, Caesar C, Calvet D, Delbart A, Dozono M, Feng J, Flavigny F, Gheller JM, Giganon A, Gillibert A, Hasegawa K, Isobe T, Kanaya Y, Kawakami S, Kim D, Kiyokawa Y, Kobayashi M, Kobayashi N, Kobayashi T, Kondo Y, Korkulu Z, Koyama S, Lapoux V, Maeda Y, Motobayashi T, Miyazaki T, Nakamura T, Nakatsuka N, Nishio Y, Obertelli A, Ohkura A, Ota S, Otsu H, Ozaki T, Panin V, Paschalis S, Pollacco EC, Reichert S, Rousse JY, Saito AT, Sakaguchi S, Sako M, Santamaria C, Sasano M, Sato H, Shikata M, Shimizu Y, Shindo Y, Stuhl L, Sumikama T, Sun YL, Tabata M, Togano Y, Tsubota J, Uesaka T, Yang ZH, Yasuda J, Yoneda K, and Zenihiro J

Abstract

The structure and decay of the most neutron-rich beryllium isotope, ^{16}Be, has been investigated following proton knockout from a high-energy ^{17}B beam. Two relatively narrow resonances were observed for the first time, with energies of 0.84(3) and 2.15(5) MeV above the two-neutron decay threshold and widths of 0.32(8) and 0.95(15) MeV, respectively. These were assigned to be the ground (J^{π}=0^{+}) and first excited (2^{+}) state, with E_{x}=1.31(6)  MeV. The mass excess of ^{16}Be was thus deduced to be 56.93(13) MeV, some 0.5 MeV more bound than the only previous measurement. Both states were observed to decay by direct two-neutron emission. Calculations incorporating the evolution of the wave function during the decay as a genuine three-body process reproduced the principal characteristics of the neutron-neutron energy spectra for both levels, indicating that the ground state exhibits a strong spatially compact dineutron component, while the 2^{+} level presents a far more diffuse neutron-neutron distribution.

Published
2024
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17. Quasifree Neutron Knockout Reaction Reveals a Small s-Orbital Component in the Borromean Nucleus ^{17}B.

Author

Yang ZH, Kubota Y, Corsi A, Yoshida K, Sun XX, Li JG, Kimura M, Michel N, Ogata K, Yuan CX, Yuan Q, Authelet G, Baba H, Caesar C, Calvet D, Delbart A, Dozono M, Feng J, Flavigny F, Gheller JM, Gibelin J, Giganon A, Gillibert A, Hasegawa K, Isobe T, Kanaya Y, Kawakami S, Kim D, Kiyokawa Y, Kobayashi M, Kobayashi N, Kobayashi T, Kondo Y, Korkulu Z, Koyama S, Lapoux V, Maeda Y, Marqués FM, Motobayashi T, Miyazaki T, Nakamura T, Nakatsuka N, Nishio Y, Obertelli A, Ohkura A, Orr NA, Ota S, Otsu H, Ozaki T, Panin V, Paschalis S, Pollacco EC, Reichert S, Roussé JY, Saito AT, Sakaguchi S, Sako M, Santamaria C, Sasano M, Sato H, Shikata M, Shimizu Y, Shindo Y, Stuhl L, Sumikama T, Sun YL, Tabata M, Togano Y, Tsubota J, Xu FR, Yasuda J, Yoneda K, Zenihiro J, Zhou SG, Zuo W, and Uesaka T

Abstract

A kinematically complete quasifree (p,pn) experiment in inverse kinematics was performed to study the structure of the Borromean nucleus ^{17}B, which had long been considered to have a neutron halo. By analyzing the momentum distributions and exclusive cross sections, we obtained the spectroscopic factors for 1s_{1/2} and 0d_{5/2} orbitals, and a surprisingly small percentage of 9(2)% was determined for 1s_{1/2}. Our finding of such a small 1s_{1/2} component and the halo features reported in prior experiments can be explained by the deformed relativistic Hartree-Bogoliubov theory in continuum, revealing a definite but not dominant neutron halo in ^{17}B. The present work gives the smallest s- or p-orbital component among known nuclei exhibiting halo features and implies that the dominant occupation of s or p orbitals is not a prerequisite for the occurrence of a neutron halo.

Published
2021
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18. Surface Localization of the Dineutron in ^{11}Li.

Author

Kubota Y, Corsi A, Authelet G, Baba H, Caesar C, Calvet D, Delbart A, Dozono M, Feng J, Flavigny F, Gheller JM, Gibelin J, Giganon A, Gillibert A, Hasegawa K, Isobe T, Kanaya Y, Kawakami S, Kim D, Kikuchi Y, Kiyokawa Y, Kobayashi M, Kobayashi N, Kobayashi T, Kondo Y, Korkulu Z, Koyama S, Lapoux V, Maeda Y, Marqués FM, Motobayashi T, Miyazaki T, Nakamura T, Nakatsuka N, Nishio Y, Obertelli A, Ogata K, Ohkura A, Orr NA, Ota S, Otsu H, Ozaki T, Panin V, Paschalis S, Pollacco EC, Reichert S, Roussé JY, Saito AT, Sakaguchi S, Sako M, Santamaria C, Sasano M, Sato H, Shikata M, Shimizu Y, Shindo Y, Stuhl L, Sumikama T, Sun YL, Tabata M, Togano Y, Tsubota J, Yang ZH, Yasuda J, Yoneda K, Zenihiro J, and Uesaka T

Abstract

The formation of a dineutron in the ^{11}Li nucleus is found to be localized to the surface region. The experiment measured the intrinsic momentum of the struck neutron in ^{11}Li via the (p,pn) knockout reaction at 246  MeV/nucleon. The correlation angle between the two neutrons is, for the first time, measured as a function of the intrinsic neutron momentum. A comparison with reaction calculations reveals the localization of the dineutron at r∼3.6  fm. The results also support the density dependence of dineutron formation as deduced from Hartree-Fock-Bogoliubov calculations for nuclear matter.

Published
2020
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19. Mapping of a New Deformation Region around ^{62}Ti.

Author

Michimasa S, Kobayashi M, Kiyokawa Y, Ota S, Yokoyama R, Nishimura D, Ahn DS, Baba H, Berg GPA, Dozono M, Fukuda N, Furuno T, Ideguchi E, Inabe N, Kawabata T, Kawase S, Kisamori K, Kobayashi K, Kubo T, Kubota Y, Lee CS, Matsushita M, Miya H, Mizukami A, Nagakura H, Oikawa H, Sakai H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tokieda H, Uesaka T, Yako K, Yamaguchi Y, Yanagisawa Y, Yoshida K, and Shimoura S

Abstract

We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{58-60}Sc, ^{60-62}Ti, and ^{62-64}V were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of ^{62}Ti increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near N=40 are affected by the Jahn-Teller effect. Therefore, a development of Jahn-Teller stabilization appears below the Cr isotopes, and the systematics in Sc, Ti, and V isotopes suggest that ^{62}Ti is located close to the peak of the Jahn-Teller effect.

Published
2020
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20. How Different is the Core of ^{25}F from ^{24}O_{g.s.} ?

Author

Tang TL, Uesaka T, Kawase S, Beaumel D, Dozono M, Fujii T, Fukuda N, Fukunaga T, Galindo-Uribarri A, Hwang SH, Inabe N, Kameda D, Kawahara T, Kim W, Kisamori K, Kobayashi M, Kubo T, Kubota Y, Kusaka K, Lee CS, Maeda Y, Matsubara H, Michimasa S, Miya H, Noro T, Obertelli A, Ogata K, Ota S, Padilla-Rodal E, Sakaguchi S, Sakai H, Sasano M, Shimoura S, Stepanyan SS, Suzuki H, Takaki M, Takeda H, Tokieda H, Wakasa T, Wakui T, Yako K, Yanagisawa Y, Yasuda J, Yokoyama R, Yoshida K, Yoshida K, and Zenihiro J

Abstract

The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A  MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual ^{24}O nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the ^{24}O core of ^{25}F nucleus significantly differs from a free ^{24}O nucleus, and the core consists of ∼35% ^{24}O_{g.s.}. and ∼65% excited ^{24}O. The result may infer that the addition of the 0d_{5/2} proton considerably changes neutron structure in ^{25}F from that in ^{24}O, which could be a possible mechanism responsible for the oxygen dripline anomaly.

Published
2020
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21. Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in ^{132}Sn.

Author

Yasuda J, Sasano M, Zegers RGT, Baba H, Bazin D, Chao W, Dozono M, Fukuda N, Inabe N, Isobe T, Jhang G, Kameda D, Kaneko M, Kisamori K, Kobayashi M, Kobayashi N, Kobayashi T, Koyama S, Kondo Y, Krasznahorkay AJ, Kubo T, Kubota Y, Kurata-Nishimura M, Lee CS, Lee JW, Matsuda Y, Milman E, Michimasa S, Motobayashi T, Muecher D, Murakami T, Nakamura T, Nakatsuka N, Ota S, Otsu H, Panin V, Powell W, Reichert S, Sakaguchi S, Sakai H, Sako M, Sato H, Shimizu Y, Shikata M, Shimoura S, Stuhl L, Sumikama T, Suzuki H, Tangwancharoen S, Takaki M, Takeda H, Tako T, Togano Y, Tokieda H, Tsubota J, Uesaka T, Wakasa T, Yako K, Yoneda K, and Zenihiro J

Abstract

The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g^{'}, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216  MeV/u on a neutron-rich doubly magic unstable nucleus, ^{132}Sn with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from ^{132}Sn leading to ^{132}Sb exhibit the GT giant resonance (GTR) at the excitation energy of 16.3±0.4(stat)±0.4(syst)  MeV with the width of Γ=4.7±0.8  MeV. The integrated GT strength up to E_{x}=25  MeV is S_{GT}^{-}=53±5(stat)_{-10}^{+11}(syst), corresponding to 56% of Ikeda's sum rule of 3(N-Z)=96. The present result accurately constrains the Landau-Migdal parameter as g^{'}=0.68±0.07, thanks to the high sensitivity of the GTR energy to g^{'}. In combination with previous studies on the GTR for ^{90}Zr and ^{208}Pb, the result of this work shows the constancy of this parameter in the nuclear chart region with (N-Z)/A=0.11 to 0.24 and A=90 to 208.

Published
2018
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22. Magic Nature of Neutrons in ^{54}Ca: First Mass Measurements of ^{55-57}Ca.

Author

Michimasa S, Kobayashi M, Kiyokawa Y, Ota S, Ahn DS, Baba H, Berg GPA, Dozono M, Fukuda N, Furuno T, Ideguchi E, Inabe N, Kawabata T, Kawase S, Kisamori K, Kobayashi K, Kubo T, Kubota Y, Lee CS, Matsushita M, Miya H, Mizukami A, Nagakura H, Nishimura D, Oikawa H, Sakai H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tokieda H, Uesaka T, Yako K, Yamaguchi Y, Yanagisawa Y, Yokoyama R, Yoshida K, and Shimoura S

Abstract

We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990)  keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.

Published
2018
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23. Excitation of the Isovector Spin Monopole Resonance via the Exothermic ^{90}Zr(^{12}N,^{12}C) Reaction at 175  MeV/u.

Author

Noji S, Sakai H, Aoi N, Baba H, Berg GPA, Doornenbal P, Dozono M, Fukuda N, Inabe N, Kameda D, Kawabata T, Kawase S, Kikuchi Y, Kisamori K, Kubo T, Maeda Y, Matsubara H, Michimasa S, Miki K, Miya H, Miyasako H, Sakaguchi S, Sasamoto Y, Shimoura S, Takaki M, Takeda H, Takeuchi S, Tokieda H, Ohnishi T, Ota S, Uesaka T, Wang H, Yako K, Yanagisawa Y, Yokota N, Yoshida K, and Zegers RGT

Abstract

The (^{12}N, ^{12}C) charge-exchange reaction at 175  MeV/u was developed as a novel probe for studying the isovector spin giant monopole resonance (IVSMR), whose properties are important for better understanding the bulk properties of nuclei and asymmetric nuclear matter. This probe, now available through the production of ^{12}N as a secondary rare-isotope beam, is exothermic, is strongly absorbed at the surface of the target nucleus, and provides selectivity for spin-transfer excitations. All three properties enhance the excitation of the IVSMR compared to other, primarily light-ion, probes, which have been used to study the IVSMR thus far. The ^{90}Zr(^{12}N,^{12}C) reaction was measured and the excitation energy spectra up to about 70 MeV for both the spin-transfer and non-spin-transfer channels were deduced separately by tagging the decay by γ emission from the ^{12}C ejectile. Besides the well-known Gamow-Teller and isobaric analog transitions, a clear signature of the IVSMR was identified. By comparing with the results from light-ion reactions on the same target nucleus and theoretical predictions, the suitability of this new probe for studying the IVSMR was confirmed.

Published
2018
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24. Gamow-Teller strength distributions in 48Sc by the 48Ca(p,n) and 48Ti(n,p) reactions and two-neutrino double-beta decay nuclear matrix elements.

Author

Yako K, Sasano M, Miki K, Sakai H, Dozono M, Frekers D, Greenfield MB, Hatanaka K, Ihara E, Kato M, Kawabata T, Kuboki H, Maeda Y, Matsubara H, Muto K, Noji S, Okamura H, Okabe TH, Sakaguchi S, Sakemi Y, Sasamoto Y, Sekiguchi K, Shimizu Y, Suda K, Tameshige Y, Tamii A, Uesaka T, Wakasa T, and Zheng H

Abstract

The double-differential cross sections for the 48Ca(p,n) and 48Ti(n,p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30 MeV in 48Sc are 15.3+/-2.2 and 2.8+/-0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8 MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-beta decay is incomplete.

Published
2009
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