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145 results on '"T, Sumikama"'

1. OEDO-SHARAQ system: Multifaceted performances in low-energy RI production and high-resolution spectroscopy

Author: S. Michimasa, T. Chillery, J.W. Hwang, T. Sumikama, S. Hanai, N. Imai, M. Dozono, S. Ota, D.S. Ahn, S. Hayakawa, Y. Hijikata, K. Kameya, K. Kawata, R. Kojima, K. Kusaka, J. Li, K. Miki, M. Ohtake, Y. Shimizu, D. Suzuki, H. Suzuki, H. Takeda, K. Yako, Y. Yanagisawa, K. Yoshida, M. Yoshimoto, and S. Shimoura
Subjects: Nuclear and High Energy Physics, Instrumentation
Published: 2023
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2. First spectroscopic study of odd-odd Cu78

Author: L. G. Pedersen, E. Sahin, A. Görgen, F. L. Bello Garrote, Y. Tsunoda, T. Otsuka, M. Niikura, S. Nishimura, Z. Xu, H. Baba, G. Benzoni, F. Browne, A. M. Bruce, S. Ceruti, F. C. L. Crespi, R. Daido, G. de Angelis, M.-C. Delattre, Zs. Dombradi, P. Doornenbal, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, T. Isobe, P. R. John, H. S. Jung, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, V. Modamio, S. Momiyama, A. I. Morales, P. Morfouace, D. R. Napoli, F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, P.-A. Söderström, D. Sohler, I. G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Z. Vajta, J. J. Valiente-Dobón, H. Watanabe, V. Werner, J. Wu, A. Yagi, M. Yalcinkaya, R. Yokoyama, and K. Yoshinaga
Published: 2023
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3. Gamow-Teller decay of Te142 to I142

Author: B. Moon, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama
Published: 2023
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4. First observation of isomeric states in Zr111, Nb113 , and Mo115

Author: J. Wu, S. Nishimura, P.-A. Söderström, A. Algora, J. J. Liu, V. H. Phong, Y. Q. Wu, F. R. Xu, J. Agramunt, D. S. Ahn, T. A. Berry, C. G. Bruno, J. J. Bundgaard, R. Caballero-Folch, A. C. Dai, T. Davinson, I. Dillmann, A. Estrade, A. Fijałkowska, N. Fukuda, S. Go, R. K. Grzywacz, T. Isobe, S. Kubono, G. Lorusso, K. Matsui, A. I. Morales, N. Nepal, S. E. A. Orrigo, B. C. Rasco, K. P. Rykaczewski, H. Sakurai, Y. Shimizu, D. W. Stracener, T. Sumikama, H. Suzuki, J. L. Tain, H. Takeda, A. Tarifeño-Saldivia, A. Tolosa-Delgado, M. Wolińska-Cichocka, and R. Yokoyama
Published: 2022
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5. Isoscaling in central Sn+Sn collisions at 270 MeV/u

Author: J. W. Lee, M. B. Tsang, C. Y. Tsang, R. Wang, J. Barney, J. Estee, T. Isobe, M. Kaneko, M. Kurata-Nishimura, W. G. Lynch, T. Murakami, A. Ono, S. R. Souza, D. S. Ahn, L. Atar, T. Aumann, H. Baba, K. Boretzky, J. Brzychczyk, G. Cerizza, N. Chiga, N. Fukuda, I. Gasparic, B. Hong, A. Horvat, K. Ieki, N. Ikeno, N. Inabe, G. Jhang, Y. J. Kim, T. Kobayashi, Y. Kondo, P. Lasko, H. S. Lee, Y. Leifels, J. Łukasik, J. Manfredi, A. B. McIntosh, P. Morfouace, T. Nakamura, N. Nakatsuka, S. Nishimura, H. Otsu, P. Pawłowski, K. Pelczar, D. Rossi, H. Sakurai, C. Santamaria, H. Sato, H. Scheit, R. Shane, Y. Shimizu, H. Simon, A. Snoch, A. Sochocka, T. Sumikama, H. Suzuki, D. Suzuki, H. Takeda, S. Tangwancharoen, Y. Togano, Z. G. Xiao, S. J. Yennello, Y. Zhang, and (the S π RIT collaboration)
Subjects: Nuclear Theory (nucl-th), Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, Heavy radioactive isotope collisions, Cluster productions, Nuclear symmetry energy, Antisymmetrized molecular dynamics
Abstract: Experimental information on fragment emissions is important in understanding the dynamics of nuclear collisions and in the development of transport model simulating heavy-ion collisions. The composition of complex fragments emitted in the heavy-ion collisions can be explained by statistical models, which assume that thermal equilibrium is achieved at collision energies below 100 MeV/u. Our new experimental data together with theoretical analyses for light particles from Sn+Sn collisions at 270 MeV/u, suggest that the hypothesis of thermal equilibrium breaks down for particles emitted with high transfer momentum. To inspect the system's properties in such limit, the scaling features of the yield ratios of particles from two systems, a neutron-rich system of ${}^{132}\mathrm{Sn}+{}^{124}\mathrm{Sn}$ and a nearly symmetric system of ${}^{108}\mathrm{Sn}+{}^{112}\mathrm{Sn}$, are examined in the framework of the statistical multifragmentation model and the antisymmetrized molecular dynamics model. The isoscaling from low energy particles agree with both models. However the observed breakdown of isoscaling for particles with high transverse momentum cannot be explained by the antisymmetrized molecular dynamics model.
Published: 2022
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6. β -Delayed One and Two Neutron Emission Probabilities Southeast of Sn132 and the Odd-Even Systematics in r -Process Nuclide Abundances

Author: V. H. Phong, S. Nishimura, G. Lorusso, T. Davinson, A. Estrade, O. Hall, T. Kawano, J. Liu, F. Montes, N. Nishimura, R. Grzywacz, K. P. Rykaczewski, J. Agramunt, D. S. Ahn, A. Algora, J. M. Allmond, H. Baba, S. Bae, N. T. Brewer, C. G. Bruno, R. Caballero-Folch, F. Calviño, P. J. Coleman-Smith, G. Cortes, I. Dillmann, C. Domingo-Pardo, A. Fijalkowska, N. Fukuda, S. Go, C. J. Griffin, J. Ha, L. J. Harkness-Brennan, T. Isobe, D. Kahl, L. H. Khiem, G. G. Kiss, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, J. Liang, Z. Liu, K. Matsui, K. Miernik, B. Moon, A. I. Morales, P. Morrall, N. Nepal, R. D. Page, M. Piersa-Siłkowska, V. F. E. Pucknell, B. C. Rasco, B. Rubio, H. Sakurai, Y. Shimizu, D. W. Stracener, T. Sumikama, H. Suzuki, J. L. Tain, H. Takeda, A. Tarifeño-Saldivia, A. Tolosa-Delgado, M. Wolińska-Cichocka, P. J. Woods, and R. Yokoyama
Subjects: General Physics and Astronomy
Published: 2022
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7. Charge-changing cross sections for Ca42–51 and effect of charged-particle evaporation induced by neutron-removal reactions

Author: M. Tanaka, M. Takechi, A. Homma, A. Prochazka, M. Fukuda, D. Nishimura, T. Suzuki, T. Moriguchi, D. S. Ahn, A. Aimaganbetov, M. Amano, H. Arakawa, S. Bagchi, K.-H. Behr, N. Burtebayev, K. Chikaato, H. Du, T. Fujii, N. Fukuda, H. Geissel, T. Hori, S. Hoshino, R. Igosawa, A. Ikeda, N. Inabe, K. Inomata, K. Itahashi, T. Izumikawa, D. Kamioka, N. Kanda, I. Kato, I. Kenzhina, Z. Korkulu, Y. Kuk, K. Kusaka, K. Matsuta, M. Mihara, E. Miyata, D. Nagae, S. Nakamura, M. Nassurlla, K. Nishimuro, K. Nishizuka, K. Ohnishi, M. Ohtake, T. Ohtsubo, S. Omika, H. J. Ong, A. Ozawa, H. Sakurai, C. Scheidenberger, Y. Shimizu, T. Sugihara, T. Sumikama, H. Suzuki, S. Suzuki, H. Takeda, Y. Tanaka, Y. K. Tanaka, I. Tanihata, T. Wada, K. Wakayama, S. Yagi, T. Yamaguchi, R. Yanagihara, Y. Yanagisawa, K. Yoshida, and T. K. Zholdybayev
Published: 2022
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8. Discovery of ^{39}Na

Author: D S, Ahn, J, Amano, H, Baba, N, Fukuda, H, Geissel, N, Inabe, S, Ishikawa, N, Iwasa, T, Komatsubara, T, Kubo, K, Kusaka, D J, Morrissey, T, Nakamura, M, Ohtake, H, Otsu, T, Sakakibara, H, Sato, B M, Sherrill, Y, Shimizu, T, Sumikama, H, Suzuki, H, Takeda, O B, Tarasov, H, Ueno, Y, Yanagisawa, and K, Yoshida
Abstract: The new isotope ^{39}Na, the most neutron-rich sodium nucleus observed so far, was discovered at the RIKEN Nishina Center Radioactive Isotope Beam Factory using the projectile fragmentation of an intense ^{48}Ca beam at 345 MeV/nucleon on a beryllium target. Projectile fragments were separated and identified in flight with the large-acceptance two-stage separator BigRIPS. Nine ^{39}Na events have been unambiguously observed in this work and clearly establish the particle stability of ^{39}Na. Furthermore, the lack of observation of ^{35,36}Ne isotopes in this experiment significantly improves the overall confidence that ^{34}Ne is the neutron dripline nucleus of neon. These results provide new key information to understand nuclear binding and nuclear structure under extremely neutron-rich conditions. The newly established stability of ^{39}Na has a significant impact on nuclear models and theories predicting the neutron dripline and also provides a key to understanding the nuclear shell property of ^{39}Na at the neutron number N=28, which is normally a magic number.
Published: 2022

9. β-Delayed One and Two Neutron Emission Probabilities Southeast of ^{132}Sn and the Odd-Even Systematics in r-Process Nuclide Abundances

Author: V H, Phong, S, Nishimura, G, Lorusso, T, Davinson, A, Estrade, O, Hall, T, Kawano, J, Liu, F, Montes, N, Nishimura, R, Grzywacz, K P, Rykaczewski, J, Agramunt, D S, Ahn, A, Algora, J M, Allmond, H, Baba, S, Bae, N T, Brewer, C G, Bruno, R, Caballero-Folch, F, Calviño, P J, Coleman-Smith, G, Cortes, I, Dillmann, C, Domingo-Pardo, A, Fijalkowska, N, Fukuda, S, Go, C J, Griffin, J, Ha, L J, Harkness-Brennan, T, Isobe, D, Kahl, L H, Khiem, G G, Kiss, A, Korgul, S, Kubono, M, Labiche, I, Lazarus, J, Liang, Z, Liu, K, Matsui, K, Miernik, B, Moon, A I, Morales, P, Morrall, N, Nepal, R D, Page, M, Piersa-Siłkowska, V F E, Pucknell, B C, Rasco, B, Rubio, H, Sakurai, Y, Shimizu, D W, Stracener, T, Sumikama, H, Suzuki, J L, Tain, H, Takeda, A, Tarifeño-Saldivia, A, Tolosa-Delgado, M, Wolińska-Cichocka, P J, Woods, and R, Yokoyama
Abstract: The β-delayed one- and two-neutron emission probabilities (P_{1n} and P_{2n}) of 20 neutron-rich nuclei with N≥82 have been measured at the RIBF facility of the RIKEN Nishina Center. P_{1n} of ^{130,131}Ag, ^{133,134}Cd, ^{135,136}In, and ^{138,139}Sn were determined for the first time, and stringent upper limits were placed on P_{2n} for nearly all cases. β-delayed two-neutron emission (β2n) was unambiguously identified in ^{133}Cd and ^{135,136}In, and their P_{2n} were measured. Weak β2n was also detected from ^{137,138}Sn. Our results highlight the effect of the N=82 and Z=50 shell closures on β-delayed neutron emission probability and provide stringent benchmarks for newly developed macroscopic-microscopic and self-consistent global models with the inclusion of a statistical treatment of neutron and γ emission. The impact of our measurements on r-process nucleosynthesis was studied in a neutron star merger scenario. Our P_{1n} and P_{2n} have a direct impact on the odd-even staggering of the final abundance, improving the agreement between calculated and observed Solar System abundances. The odd isotope fraction of Ba in r-process-enhanced (r-II) stars is also better reproduced using our new data.
Published: 2022

10. Various nuclear structures in Xe140 studied by β decay of ground and isomeric states in I140

Author: A. Yagi, A. Odahara, H. Nishibata, R. Lozeva, C.-B. Moon, S. Nishimura, K. Yoshida, N. Yoshinaga, C. Watanabe, K. Higashiyama, T. Shimoda, R. Daido, Y. Fang, P. S. Lee, B. Moon, P. Doornenbal, G. Lorusso, P.-A. Söderström, T. Sumikama, H. Watanabe, T. Isobe, H. Baba, H. Sakurai, F. Browne, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J.-M. Daugas, F. Didierjean, E. Ideguchi, S. Iimura, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, C. S. Lee, S. Morimoto, M. Niikura, I. Nishizuka, and K. Tshoo
Published: 2022
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11. First observation of the π0h11/2⊗ν0h9/2 partner orbital configuration in the odd-odd I138 nucleus

Author: B. Moon, A. Gargano, H. Naïdja, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, M. Si, L. Sinclair, P.-A. Söderström, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama
Published: 2022
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12. Half-life Measurement Using Implant-$(\beta -\gamma )$ Time Correlations in the Region of Neutron-rich Lanthanides

Author: A. Vitéz-Sveiczer, S. Kovács, G.G. Kiss, Y. Saito, A. Tarifeño-Saldivia, M. Pallas, J.L. Tain, I. Dillmann, J. Agramunt, A. Algora, C. Domingo-Pardo, A. Estrade, C. Appleton, J.M. Allmond, P. Aguilera, H. Baba, N.T. Brewer, C. Bruno, R. Caballero-Folch, F. Calvino, P.J. Coleman-Smith, G. Cortes, T. Davinson, N. Fukuda, Z. Ge, S. Go, C.J. Griffin, R.K. Grzywacz, O. Hall, A. Horváth, J. Ha, L.J. Harkness-Brennan, T. Isobe, D. Kahl, T.T. King, A. Korgul, R. Krücken, S. Kubono, M. Labiche, J. Liu, J. Liang, M. Madurga, K. Miernik, F. Molina, A.I. Morales, M.R. Mumpower, E. Nacher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Siłkowska, V. Phong, B.C. Rasco, B. Rubio, K.P. Rykaczewski, J. Romero-Barrientos, H. Sakurai, L. Sexton, Y. Shimizu, M. Singh, T. Sprouse, T. Sumikama, R. Surman, H. Suzuki, T.N. Szegedi, H. Takeda, A. Tolosa-Delgado, K. Wang, M. Wolinska-Cichocka, P. Woods, R. Yokoyama, and Z. Xu
Subjects: General Physics and Astronomy
Published: 2023
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13. Experimental Level Scheme of $^{78}$Cu

Author: L.G. Pedersen, E. Sahin, A. Görgen, F.L. Bello Garrote, Y. Tsunoda, T. Otsuka, M. Niikura, S. Nishimura, Z. Xu, H. Baba, G. Benzoni, F. Browne, A.M. Bruce, S. Ceruti, F.C.L. Crespi, R. Daido, G. de Angelis, M.-C. Delattre, Zs. Dombradi, P. Doornenbal, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, T. Isobe, P.R. John, H.S. Jung, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, V. Modamio, S. Momiyama, A.I. Morales, P. Morfouace, D.R. Napoli, F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, P.-A. Söderström, D. Sohler, I.G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Z. Vajta, J.J. Valiente-Dobón, H. Watanabe, V. Werner, J. Wu, A. Yagi, M. Yalcinkaya, R. Yokoyama, and K. Yoshinaga
Subjects: General Physics and Astronomy
Published: 2023
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14. Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160)

Author: M. Pallàs, A. Tarifeño-Saldivia, G. G. Kiss, J. L. Tain, A. Tolosa-Delgado, A. Vitéz-Sveiczer, F. Calviño, J. Agramunt, P. Aguilera, A. Algora, J. M. Allmond, H. Baba, N. T. Brewer, R. Caballero-Folch, P. J. Coleman-Smith, G. Cortes, T. Davinson, I. Dillmann, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, S. Kubono, M. Labiche, J. Liu, M. Madurga, K. Miernik, F. Molina, N. Mont-Geli, A. I. Morales, E. Nácher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Silkowska, V. Phong, B. C. Rasco, J. Romero-Barrientos, B. Rubio, K. P. Rykaczewski, Y. Saito, H. Sakurai, Y. Shimizu, M. Singh, T. Sumikama, H. Suzuki, T. N. Szegedi, H. Takeda, K. Wang, M. Wolińska-Cichocka, P. J. Woods, and R. Yokoyama
Subjects: General Medicine
Abstract: At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives (T1/2) and β-delayed neutron-emission probabilities (Pxn). The setup consisted of the BigRIPS in-flight separator for particle identification, the Advanced Implantation Detector Array (AIDA) for ions and β detection, and the BRIKEN neutron counter for neutron detection. Using this arrangement, 4 new T1/2 and 14 new P1n were measured. Furthermore, 38 T1/2 and 2 P1n values were remeasured, decreasing the uncertainties for some of them. In addition to improving predictions of nucleosynthesis models that describe the production of the rare-earth peak at A ∼ 160 via the r-process, these additional experimental data should help to constrain theoretical models for calculations of T1/2 and Pxn in this region.
Published: 2023
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15. Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Author: G. G. Kiss, A. Vitéz-Sveiczer, Y. Saito, A. Tarifeño-Saldivia, M. Pallas, J. L. Tain, I. Dillmann, J. Agramunt, A. Algora, C. Domingo-Pardo, A. Estrade, C. Appleton, J. M. Allmond, P. Aguilera, H. Baba, N. T. Brewer, C. Bruno, R. Caballero-Folch, F. Calvino, P. J. Coleman-Smith, G. Cortes, T. Davinson, N. Fukuda, Z. Ge, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, A. Horváth, J. Ha, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, R. Krücken, S. Kubono, M. Labiche, J. Liu, J. Liang, M. Madurga, K. Miernik, F. Molina, A. I. Morales, M. R. Mumpower, E. Nacher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Siłkowska, V. Phong, B. C. Rasco, B. Rubio, K. P. Rykaczewski, J. Romero-Barrientos, H. Sakurai, L. Sexton, Y. Shimizu, M. Singh, T. Sprouse, T. Sumikama, R. Surman, H. Suzuki, T. N. Szegedi, H. Takeda, A. Tolosa, K. Wang, M. Wolinska-Cichocka, P. Woods, R. Yokoyama, Z. Xu, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Física [Àrees temàtiques de la UPC], Space and Planetary Science, Astronomy and Astrophysics, Stars, Nucleosynthesis, Estels, Nucleosíntesi
Abstract: The β-delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes of Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The existing β-decay half-life (T 1/2) database was significantly increased toward more neutron-rich isotopes, and uncertainties for previously measured values were decreased. The new data not only constrain the theoretical predictions of half-lives and β-delayed neutron-emission probabilities, but also allow for probing the mechanisms of formation of the high-mass wing of the rare-earth peak located at A ≈ 160 in the r-process abundance distribution through astrophysical reaction network calculations. An uncertainty quantification of the calculated abundance patterns with the new data shows a reduction of the uncertainty in the rare-earth peak region. The newly introduced variance-based sensitivity analysis method offers valuable insight into the influence of important nuclear physics inputs on the calculated abundance patterns. The analysis has identified the half-lives of 168Sm and of several gadolinium isotopes as some of the key variables among the current experimental data to understand the remaining abundance uncertainty at A = 167–172.
Published: 2022
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16. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author: J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu
Subjects: Physics, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Published: 2021
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17. Quasi-free Neutron Knockout Reaction Reveals a Small $s$-orbital Component in the Borromean Nucleus $^{17}$B

Author: Z H, Yang, Y, Kubota, A, Corsi, K, Yoshida, X-X, Sun, J G, Li, M, Kimura, N, Michel, K, Ogata, C X, Yuan, Q, Yuan, G, Authelet, H, Baba, C, Caesar, D, Calvet, A, Delbart, M, Dozono, J, Feng, F, Flavigny, J-M, Gheller, J, Gibelin, A, Giganon, A, Gillibert, K, Hasegawa, T, Isobe, Y, Kanaya, S, Kawakami, D, Kim, Y, Kiyokawa, M, Kobayashi, N, Kobayashi, T, Kobayashi, Y, Kondo, Z, Korkulu, S, Koyama, V, Lapoux, Y, Maeda, F M, Marqués, T, Motobayashi, T, Miyazaki, T, Nakamura, N, Nakatsuka, Y, Nishio, A, Obertelli, A, Ohkura, N A, Orr, S, Ota, H, Otsu, T, Ozaki, V, Panin, S, Paschalis, E C, Pollacco, S, Reichert, J-Y, Roussé, A T, Saito, S, Sakaguchi, M, Sako, C, Santamaria, M, Sasano, H, Sato, M, Shikata, Y, Shimizu, Y, Shindo, L, Stuhl, T, Sumikama, Y L, Sun, M, Tabata, Y, Togano, J, Tsubota, F R, Xu, J, Yasuda, K, Yoneda, J, Zenihiro, S-G, Zhou, W, Zuo, T, Uesaka, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear Theory, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, Astrophysics::Galaxy Astrophysics, Nuclear Physics
Abstract: A kinematically complete quasi-free $(p,pn)$ experiment in inverse kinematics was performed to study the structure of the Borromean nucleus $^{17}$B, which had long been considered to have 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 neutron halo., Accepted for publication in Physical Review Letters,8 pages, 4 figures
Published: 2021
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18. Fragmentation of Single-Particle Strength around the Doubly Magic Nucleus ^{132}Sn and the Position of the 0f_{5/2} Proton-Hole State in ^{131}In

Author: V, Vaquero, A, Jungclaus, T, Aumann, J, Tscheuschner, E V, Litvinova, J A, Tostevin, H, Baba, D S, Ahn, R, Avigo, K, Boretzky, A, Bracco, C, Caesar, F, Camera, S, Chen, V, Derya, P, Doornenbal, J, Endres, N, Fukuda, U, Garg, A, Giaz, M N, Harakeh, M, Heil, A, Horvat, K, Ieki, N, Imai, N, Inabe, N, Kalantar-Nayestanaki, N, Kobayashi, Y, Kondo, S, Koyama, T, Kubo, I, Martel, M, Matsushita, B, Million, T, Motobayashi, T, Nakamura, N, Nakatsuka, M, Nishimura, S, Nishimura, S, Ota, H, Otsu, T, Ozaki, M, Petri, R, Reifarth, J L, Rodríguez-Sánchez, D, Rossi, A T, Saito, H, Sakurai, D, Savran, H, Scheit, F, Schindler, P, Schrock, D, Semmler, Y, Shiga, M, Shikata, Y, Shimizu, H, Simon, D, Steppenbeck, H, Suzuki, T, Sumikama, D, Symochko, I, Syndikus, H, Takeda, S, Takeuchi, R, Taniuchi, Y, Togano, J, Tsubota, H, Wang, O, Wieland, K, Yoneda, J, Zenihiro, and A, Zilges
Abstract: Spectroscopic factors of neutron-hole and proton-hole states in ^{131}Sn and ^{131}In, respectively, were measured using one-nucleon removal reactions from doubly magic ^{132}Sn at relativistic energies. For ^{131}In, a 2910(50)-keV γ ray was observed for the first time and tentatively assigned to a decay from a 5/2^{-} state at 3275(50) keV to the known 1/2^{-} level at 365 keV. The spectroscopic factors determined for this new excited state and three other single-hole states provide first evidence for a strong fragmentation of single-hole strength in ^{131}Sn and ^{131}In. The experimental results are compared to theoretical calculations based on the relativistic particle-vibration coupling model and to experimental information for single-hole states in the stable doubly magic nucleus ^{208}Pb.
Published: 2019

19. Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

Author: A. Corsi, V. Lapoux, Zs. Dombradi, K. Matsui, David Steppenbeck, A. Gillibert, Alan Peyaud, Shoko Koyama, Toshiaki Ando, C. M. Shand, Hiroyoshi Sakurai, M. Rudigier, F. Browne, L. Olivier, Raymond J. Carroll, K. Yoneda, E. Sahin, Yoshiaki Shiga, Bing Ding, F. Château, Pieter Doornenbal, Hidetada Baba, Tomoyuki Saito, Tohru Motobayashi, Zs. Podolyák, Satoru Momiyama, F. Giacoppo, C. R. Nita, T. Sumikama, H. Wang, Megumi Niikura, A. Gottardo, Jenny Lee, M. Dewald, Zs. Vajta, R. Orlandi, Shuichi Ota, E. C. Pollacco, K. Hadynska-Klek, F. Flavigny, P. A. Söderström, Daisuke Suzuki, Yuya Kubota, C. Lizarazo, D. Calvet, S. Nagamine, C. Péron, Tomohiro Uesaka, R. Lozeva, Hideaki Otsu, N. Paul, Shenjian Chen, G. Authelet, Noritsugu Nakatsuka, Ryo Taniuchi, A. Delbart, Carlos A. Bertulani, J. M. Gheller, Zi Hong Liu, V. Werner, T. Arici, M. Matsushita, Masaki Sasano, M. Lettmann, B. D. Linh, C. Santamaria, Alison Bruce, J. L. Rodriguez-Sanchez, Satoshi Takeuchi, I. Stefan, M. Górska, S. Franchoo, C. Louchart, Zhengyu Xu, Zena Patel, J.-Y. Roussé, Tadaaki Isobe, S. Nishimura, A. Jungclaus, Victor Vaquero, T. Miyazaki, M. L. Cortés, A. Obertelli, K. Moschner, Kathrin Wimmer, Z. Korkulu, Jin Wu, L. X. Chung, C. R. Nobs, Jian Liu, A. Blazhev, and A. Giganon
Subjects: Physics, Hydrogen, Proton, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Cascade, Pairing, 0103 physical sciences, Bound state, Physics::Accelerator Physics, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract: Fifty-five inclusive single nucleon removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at � 250 MeV/nucleon were measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semi-microscopic model predictions,highlighting the enhanced role of low-lying level densities in nucleon removal cross sections from loosely-bound nuclei.
Published: 2019
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20. Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

Author: N, Paul, A, Obertelli, C A, Bertulani, A, Corsi, P, Doornenbal, J L, Rodriguez-Sanchez, G, Authelet, H, Baba, D, Calvet, F, Château, S, Chen, A, Delbart, J-M, Gheller, A, Giganon, A, Gillibert, T, Isobe, V, Lapoux, M, Matsushita, S, Momiyama, T, Motobayashi, M, Niikura, H, Otsu, C, Péron, A, Peyaud, E C, Pollacco, J-Y, Roussé, H, Sakurai, C, Santamaria, M, Sasano, Y, Shiga, D, Steppenbeck, S, Takeuchi, R, Taniuchi, T, Uesaka, H, Wang, K, Yoneda, T, Ando, T, Arici, A, Blazhev, F, Browne, A M, Bruce, R, Carroll, L X, Chung, M L, Cortés, M, Dewald, B, Ding, Zs, Dombradi, F, Flavigny, S, Franchoo, F, Giacoppo, M, Górska, A, Gottardo, K, Hadynska-Klek, Z, Korkulu, S, Koyama, Y, Kubota, A, Jungclaus, J, Lee, M, Lettmann, B D, Linh, J, Liu, Z, Liu, C, Lizarazo, C, Louchart, R, Lozeva, K, Matsui, T, Miyazaki, K, Moschner, S, Nagamine, N, Nakatsuka, C, Nita, S, Nishimura, C R, Nobs, L, Olivier, S, Ota, Z, Patel, Zs, Podolyák, M, Rudigier, E, Sahin, T Y, Saito, C, Shand, P-A, Söderström, I G, Stefan, T, Sumikama, D, Suzuki, R, Orlandi, V, Vaquero, Zs, Vajta, V, Werner, K, Wimmer, J, Wu, and Z, Xu
Subjects: Nuclear Theory, Physics::Accelerator Physics, Nuclear Experiment
Abstract: Fifty-five inclusive single nucleon-removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at ∼ 250 MeV / nucleon are measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons as compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting, contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semimicroscopic model predictions, highlighting the enhanced role of low-lying level densities in nucleon-removal cross sections from loosely bound nuclei.
Published: 2019

21. High-speed AFM reveals accelerated binding of agitoxin-2 to a K

Author: A, Sumino, T, Sumikama, T, Uchihashi, and S, Oiki
Subjects: Models, Molecular, Potassium Channels, Research Methods, technology, industry, and agriculture, Scorpion Venoms, SciAdv r-articles, Microscopy, Atomic Force, Recombinant Proteins, Research Articles, Arthropod Proteins, Protein Binding, Research Article
Abstract: We revealed that binding of agitoxin-2 to a K+ channel uses an induced-fit pathway by single-molecule analysis via high-speed AFM., Agitoxin-2 (AgTx2) from scorpion venom is a potent blocker of K+ channels. The docking model has been elucidated, but it remains unclear whether binding dynamics are described by a two-state model (AgTx2-bound and AgTx2-unbound) or a more complicated mechanism, such as induced fit or conformational selection. Here, we observed the binding dynamics of AgTx2 to the KcsA channel using high-speed atomic force microscopy. From images of repeated binding and dissociation of AgTx2 to the channel, single-molecule kinetic analyses revealed that the affinity of the channel for AgTx2 increased during persistent binding and decreased during persistent dissociation. We propose a four-state model, including high- and low-affinity states of the channel, with relevant rate constants. An induced-fit pathway was dominant and accelerated binding by 400 times. This is the first analytical imaging of scorpion toxin binding in real time, which is applicable to various biological dynamics including channel ligands, DNA-modifier proteins, and antigen-antibody complexes.
Published: 2019

22. Improving Nuclear Data Input for r-Process Calculations Around A $$\sim $$ 80

Author: A. Tolosa-Delgado, J. Agramunt, D. S. Ahn, A. Algora, H. Baba, S. Bae, N. T. Brewer, C. Bruno, R. Caballero Folch, F. Calviño, P. J. Coleman-Smith, G. Cortés, T. Davinson, I. Dillmann, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, R. Grzywacz, J. Ha, O. Hall, L. Harkness-Brennan, T. Isobe, D. Kahl, M. Karny, L. H. Khiem, G. G. Kiss, M. Kogimtzis, S. Kubono, M. Labiche, I. Lazarus, J. Lee, J. Liang, J. Liu, G. Lorusso, K. Matsui, K. Miernik, F. Montes, B. Moon, A. I. Morales, N. Nepal, S. Nishimura, R. D. Page, V. H. Phong, Z. Podolyak, V. F. E. Pucknell, B. C. Rasco, P. Regan, A. Riego, B. Rubio, K. P. Rykaczewski, Y. Saito, H. Sakurai, Y. Shimizu, J. Simpson, P.-A. Söderström, D. W. Stracener, T. Sumikama, H. Suzuki, J. L. Tain, M. Takechi, H. Takeda, A. Tarifeño-Saldivia, S. L. Thomas, P. J. Woods, X. X. Xu, and R. Yokoyama
Subjects: Nuclear physics, Physics, Abundance (ecology), Neutron emission, r-process, Nuclear data, Measure (mathematics)
Abstract: © 2019, Springer Nature Switzerland AG. We made an experiment to measure half-lives T1/2 and neutron emission probabilities Pxn of nuclei around mass 80, aiming to improve r-process abundance calculations around the first abundance peak with a new dedicated experimental setup at RIKEN. Details of the experiment and a few preliminary results are presented.
Published: 2019
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23. Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of $^{75}$Cu

Author: Y. Ichikawa, H. Nishibata, Y. Tsunoda, A. Takamine, K. Imamura, T. Fujita, T. Sato, S. Momiyama, Y. Shimizu, D. S. Ahn, K. Asahi, H. Baba, D. L. Balabanski, F. Boulay, J. M. Daugas, T. Egami, N. Fukuda, C. Funayama, T. Furukawa, G. Georgiev, A. Gladkov, N. Inabe, Y. Ishibashi, T. Kawaguchi, T. Kawamura, Y. Kobayashi, S. Kojima, A. Kusoglu, I. Mukul, M. Niikura, T. Nishizaka, A. Odahara, Y. Ohtomo, T. Otsuka, D. Ralet, G. S. Simpson, T. Sumikama, H. Suzuki, H. Takeda, L. C. Tao, Y. Togano, D. Tominaga, H. Ueno, H. Yamazaki, X. F. Yang, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Physics, Magnetic moment, Nuclear Theory, Shell (structure), General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, 010305 fluids & plasmas, medicine.anatomical_structure, Nucleosynthesis, 0103 physical sciences, medicine, Nuclear force, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Spin (physics), Nuclear Experiment, Nucleus
Abstract: Exotic nuclei are characterized by a number of neutrons (or protons) in excess relative to stable nuclei. Their shell structure, which represents single-particle motion in a nucleus, may vary due to nuclear force and excess neutrons, in a phenomenon called shell evolution. This effect could be counterbalanced by collective modes causing deformations of the nuclear surface. Here, we study the interplay between shell evolution and shape deformation by focusing on the magnetic moment of an isomeric state of the neutron-rich nucleus 75Cu. We measure the magnetic moment using highly spin-controlled rare-isotope beams and achieving large spin alignment via a two-step reaction scheme that incorporates an angular-momentum-selecting nucleon removal. By combining our experiments with numerical simulations of many-fermion correlations, we find that the low-lying states in 75Cu are, to a large extent, of single-particle nature on top of a correlated 74Ni core. We elucidate the crucial role of shell evolution even in the presence of the collective mode, and within the same framework, we consider whether and how the double magicity of the 78Ni nucleus is restored, which is also of keen interest from the perspective of nucleosynthesis in explosive stellar processes., 10 pages, 4 figures
Published: 2019
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24. $^{78}$Ni revealed as a doubly magic stronghold against nuclear deformation

Author: Frédéric Nowacki, L. Olivier, K. Yoneda, Tsuyoshi Miyazaki, H. Wang, I. Stefan, J. Simonis, Zhengyu Xu, C. Santamaria, Javier Fernandez Menendez, Ertan Şahin, D. Calvet, Kazuyuki Ogata, R. Lozeva, C. Louchart, Takaharu Otsuka, Satoshi Takeuchi, Alexandre Obertelli, Yusuke Tsunoda, J.-Y. Roussé, Tadaaki Isobe, F. Giacoppo, F. Château, A. Gottardo, E. C. Pollacco, Jenny Lee, T. Sumikama, K. Matsui, Zs. Vajta, David Steppenbeck, Sophie Péru, S. Nishimura, Zena Patel, Frank Browne, C. M. Shand, Tohru Motobayashi, Shinsuke Ota, S. Momiyama, Hiroyoshi Sakurai, K. Hadynska-Klek, H. Otsu, Alfredo Poves, A. Gillibert, Daisuke Suzuki, Hidetada Baba, A. Delbart, S. Franchoo, Yuki Kubota, V. Lapoux, V. Werner, Pär-Anders Söderström, M. Matsushita, Shunpei Koyama, M. Lettmann, Jason D. Holt, Z. Korkulu, A. Corsi, Alan Peyaud, Achim Schwenk, Yoshiaki Shiga, R. Taniuchi, Jin Wu, L. X. Chung, S. R. Stroberg, M. Niikura, Tomohiro Uesaka, Zs. Dombrádi, Pieter Doornenbal, C. Péron, G. Authelet, J. M. Gheller, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Proton, Nuclear Theory, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Strong interaction, FOS: Physical sciences, 01 natural sciences, Asymmetry, Nuclear Theory (nucl-th), Magic number (programming), 0103 physical sciences, Effective field theory, Physics::Atomic and Molecular Clusters, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, media_common, Physics, [PHYS]Physics [physics], Multidisciplinary, 010308 nuclear & particles physics, Magic (programming), Atomic nucleus, Atomic physics
Abstract: Nuclear magic numbers, which emerge from the strong nuclear force based on quantum chromodynamics, correspond to fully occupied energy shells of protons, or neutrons inside atomic nuclei. Doubly magic nuclei, with magic numbers for both protons and neutrons, are spherical and extremely rare across the nuclear landscape. While the sequence of magic numbers is well established for stable nuclei, evidence reveals modifications for nuclei with a large proton-to-neutron asymmetry. Here, we provide the first spectroscopic study of the doubly magic nucleus $^{78}$Ni, fourteen neutrons beyond the last stable nickel isotope. We provide direct evidence for its doubly magic nature, which is also predicted by ab initio calculations based on chiral effective field theory interactions and the quasi-particle random-phase approximation. However, our results also provide the first indication of the breakdown of the neutron magic number 50 and proton magic number 28 beyond this stronghold, caused by a competing deformed structure. State-of-the-art phenomenological shell-model calculations reproduce this shape coexistence, predicting further a rapid transition from spherical to deformed ground states with $^{78}$Ni as turning point.
Published: 2019
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25. Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in ^{132}Sn

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

26. Erratum: Persistence of the Z=28 Shell Gap Around ^{78}Ni: First Spectroscopy of ^{79}Cu [Phys. Rev. Lett. 119, 192501 (2017)]

Author: L, Olivier, S, Franchoo, M, Niikura, Z, Vajta, D, Sohler, P, Doornenbal, A, Obertelli, Y, Tsunoda, T, Otsuka, G, Authelet, H, Baba, D, Calvet, F, Château, A, Corsi, A, Delbart, J-M, Gheller, A, Gillibert, T, Isobe, V, Lapoux, M, Matsushita, S, Momiyama, T, Motobayashi, H, Otsu, C, Péron, A, Peyaud, E C, Pollacco, J-Y, Roussé, H, Sakurai, C, Santamaria, M, Sasano, Y, Shiga, S, Takeuchi, R, Taniuchi, T, Uesaka, H, Wang, K, Yoneda, F, Browne, L X, Chung, Z, Dombradi, F, Flavigny, F, Giacoppo, A, Gottardo, K, Hadyńska-Klęk, Z, Korkulu, S, Koyama, Y, Kubota, J, Lee, M, Lettmann, C, Louchart, R, Lozeva, K, Matsui, T, Miyazaki, S, Nishimura, K, Ogata, S, Ota, Z, Patel, E, Sahin, C, Shand, P-A, Söderström, I, Stefan, D, Steppenbeck, T, Sumikama, D, Suzuki, V, Werner, J, Wu, and Z, Xu
Abstract: This corrects the article DOI: 10.1103/PhysRevLett.119.192501.
Published: 2018

27. Discovery of ^{60}Ca and Implications For the Stability of ^{70}Ca

Author: O B, Tarasov, D S, Ahn, D, Bazin, N, Fukuda, A, Gade, M, Hausmann, N, Inabe, S, Ishikawa, N, Iwasa, K, Kawata, T, Komatsubara, T, Kubo, K, Kusaka, D J, Morrissey, M, Ohtake, H, Otsu, M, Portillo, T, Sakakibara, H, Sakurai, H, Sato, B M, Sherrill, Y, Shimizu, A, Stolz, T, Sumikama, H, Suzuki, H, Takeda, M, Thoennessen, H, Ueno, Y, Yanagisawa, and K, Yoshida
Abstract: The discovery of the important neutron-rich nucleus _{20}^{60}Ca_{40} and seven others near the limits of nuclear stability is reported from the fragmentation of a 345 MeV/u ^{70}Zn projectile beam on ^{9}Be targets at the radioactive ion-beam factory of the RIKEN Nishina Center. The produced fragments were analyzed and unambiguously identified using the BigRIPS two-stage in-flight separator. The eight new neutron-rich nuclei discovered, ^{47}P, ^{49}S, ^{52}Cl, ^{54}Ar, ^{57}K, ^{59,60}Ca, and ^{62}Sc, are the most neutron-rich isotopes of the respective elements. In addition, one event consistent with ^{59}K was registered. The results are compared with the drip lines predicted by a variety of mass models and it is found that the models in best agreement with the observed limits of existence in the explored region tend to predict the even-mass Ca isotopes to be bound out to at least ^{70}Ca.
Published: 2018

28. β decays of the heaviest N=Z−1 nuclei and proton instability of In97

Author: J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu
Subjects: Physics, Nuclear physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Beta (finance), 01 natural sciences, Instability
Published: 2018
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29. Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations

Author: Eiji Ideguchi, T. Kubo, Giuseppe Lorusso, Mana Tanaka, Z. H. Li, Hiroshi Suzuki, D. Kameda, Atsuko Odahara, Y. F. Fang, R. Lozeva, Jan Taprogge, Pieter Doornenbal, Gary Simpson, Hiroyoshi Sakurai, I. Nishizuka, S. Nishimura, O. Wieland, Jin Wu, Tadaaki Isobe, Stephen Rice, P. A. Söderström, Ayumi Yagi, H. Takeda, F. Browne, I. Kojouharov, S. Lalkovski, P. H. Regan, Guillaume Gey, Hiroki Nishibata, Hidetada Baba, Naoki Fukuda, Raymond J. Carroll, Oliver J. Roberts, R. Daido, Zena Patel, Zs. Podolyák, T. Sumikama, V. Werner, N. Kurz, Zhengyu Xu, Alison Bruce, H. Schaffner, F. Didierjean, L. Sinclair, Nobuyuki Chiga, Hirofumi Watanabe, and Naohito Inabe
Subjects: Physics, Nuclear and High Energy Physics, Radionuclide, Isotope, Fission, Prolate spheroid, Nuclide, Deformation (engineering), Atomic physics, Ground state, Ionizing radiation
Abstract: The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. The lifetimes of the first 2+states in 104,106Zr nuclei have been measured via β-delayed γ-ray timing of stopped radioactive isotope beams. An improved precision for the lifetime of the 2+1state in 104Zr was obtained, τ(2+1) =2.90+25−20ns, as well as a first measurement of the 2+1state in 106Zr, τ(2+1) =2.60+20−15ns, with corresponding reduced transition probabilities of B(E2; 2+1→0+g.s.) =0.39(2)e2b2and 0.31(1)e2b2, respectively. Comparisons of the extracted ground-state deformations, β2=0.39(1)(104Zr) and β2=0.36(1)(106Zr) with model calculations indicate a persistence of prolate deformation. The data show that 104Zr is the most deformed of the neutron-rich Zr isotopes measured so far.
Published: 2015
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30. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author: J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu
Subjects: 0103 physical sciences, 010306 general physics, 01 natural sciences
Published: 2018
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31. Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Author: R. Lozeva, M. Lettmann, J.-Y. Roussé, Tadaaki Isobe, Pieter Doornenbal, F. Nowacki, Zena Patel, Satoshi Takeuchi, H. Otsu, K. Matsui, M. L. Cortés, K. Yoneda, C. Santamaria, S. Franchoo, Tohru Motobayashi, Hidetada Baba, E. Sahin, Hiroyoshi Sakurai, Shuichi Ota, C. Péron, S. Nishimura, G. Authelet, F. Giacoppo, Shunpei Koyama, E. C. Pollacco, Alan Peyaud, Jin Wu, L. X. Chung, H. Wang, F. Château, F. Browne, Ryo Taniuchi, J. M. Gheller, Marc Dupuis, T. Sumikama, V. Lapoux, D. Calvet, Zs. Vajta, David Steppenbeck, A. Gillibert, A. Obertelli, Daisuke Suzuki, A. Gottardo, P. A. Söderström, Jenny Lee, S. M. Lenzi, Yoshiaki Shiga, A. Corsi, Kathrin Wimmer, K. Hadynska-Klek, Yuya Kubota, Megumi Niikura, Sophie Péru, Tomohiro Uesaka, I. Stefan, Zs. Dombrádi, C. M. Shand, Norbert Pietralla, A. Delbart, V. Werner, Z. Korkulu, Zhengyu Xu, T. Miyazaki, M. Matsushita, L. Olivier, C. Louchart, Masaki Sasano, Satoru Momiyama, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, Nuclear Theory, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Isotopes of zinc, Gamma spectroscopy, Neutron, 010306 general physics, Nucleon, Nuclear Experiment
Abstract: International audience; Proton inelastic scattering of Ni72,74 and Zn76,80 ions at energies around 235 MeV/nucleon was performed at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. Angular integrated cross sections for direct inelastic scattering to the 21+ and 41+ states were measured. The Jeukenne-Lejeune-Mahaux folding model, extended beyond 200 MeV, was used together with neutron and proton densities stemming from quasiparticle random-phase approximation (QRPA) calculations to interpret the experimental cross sections and to infer neutron to proton matrix element ratios. In addition, coupled-channels calculations with a phenomenological potential were used to determine deformation lengths. For the Ni isotopes, correlations favor neutron excitations, thus conserving the Z=28 gap. A dominance of proton excitation, on the other hand, is observed in the Zn isotopes, pointing to the conservation of the N=50 gap approaching Ni78. These results are in agreement with QRPA and large-scale shell-model calculations.
Published: 2018
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32. Spectroscopy of2565,67Mn: Strong coupling in the N = 40 'island of inversion'

Author: X.Y. Liu, Z. Liu, B. Ding, P. Doornenbal, A. Obertelli, S.M. Lenzi, P.M. Walker, L.X. Chung, B.D. Linh, G. Authelet, H. Baba, D. Calvet, F. Château, A. Corsi, A. Delbart, J.-M. Gheller, A. Gillibert, T. Isobe, V. Lapoux, M. Matsushita, S. Momiyama, T. Motobayashi, M. Niikura, F. Nowacki, H. Otsu, C. Péron, A. Peyaud, E.C. Pollacco, J.-Y. Roussé, H. Sakurai, M. Sasano, Y. Shiga, S. Takeuchi, R. Taniuchi, T. Uesaka, H. Wang, K. Yoneda, Y.H. Lam, T.H. Huang, M.D. Sun, W.Q. Zhang, H.Y. Lu, D.S. Hou, F. Browne, Zs. Dombradi, S. Franchoo, F. Giacoppo, A. Gottardo, K. Hadynska-Klek, Z. Korkulu, S. Koyama, Y. Kubota, J. Lee, M. Lettmann, R. Lozeva, K. Matsui, T. Miyazaki, S. Nishimura, C. Louchart, L. Olivier, S. Ota, Z. Patel, E. Sahin, C. Santamaria, C. Shand, P.-A. Söderström, G.L. Stefan, D. Steppenbeck, T. Sumikama, D. Suzuki, Zs. Vajta, V. Werner, J. Wu, Z. Xu, X.H. Zhou, Y.H. Zhang, H.S. Xu, and F.S. Zhang
Subjects: In-beam γ-ray spectroscopy, Strong coupling, Nuclear and High Energy Physics, Structure evolution, “Island of inversion” around N=40, lcsh:Physics, lcsh:QC1-999
Abstract: Excited states in 63,65,67Mn were studied via in-beam γ-ray spectroscopy following knockout reactions from 68Fe. Similar level schemes, consisting of the 11/2−, 9/2−, 7/2− and 5/2g.s.− level sequence, connected by I→I−1 transitions, were established, the first time for 65,67Mn. Their level structures show features consistent with strongly-coupled rotational bands with K=5/2. State-of-the-art shell-model calculations with the modified LNPS effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole neutron configurations for all the states. The data on the low-lying excited states of odd-mass 53−67Mn provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain on the n-rich side of the β stability line. These results help to deepen our understanding of the N=40 “island of inversion”. Keywords: In-beam γ-ray spectroscopy, “Island of inversion” around N=40, Strong coupling, Structure evolution
Published: 2018

33. Publisher's Note: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author: J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu
Subjects: Physics, Crystallography
Abstract: J. Park et al. -- 1 pag. -- Original Article: Properties of γ-decaying isomers and isomeric ratios in the 100 Sn region. Phys. Rev. C 96, 044311 (2017)
Published: 2017
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34. Simultaneous investigation of the T=1(Jπ=0+) and T=0(Jπ=9+) β decays in Br70

Author: A. I. Morales, A. Algora, B. Rubio, K. Kaneko, S. Nishimura, P. Aguilera, S. E. A. Orrigo, F. Molina, G. de Angelis, F. Recchia, G. Kiss, V. H. Phong, J. Wu, D. Nishimura, H. Oikawa, T. Goigoux, J. Giovinazzo, P. Ascher, J. Agramunt, D. S. Ahn, H. Baba, B. Blank, C. Borcea, A. Boso, P. Davies, F. Diel, Zs. Dombrádi, P. Doornenbal, J. Eberth, G. de France, Y. Fujita, N. Fukuda, E. Ganioglu, W. Gelletly, M. Gerbaux, S. Grévy, V. Guadilla, N. Inabe, T. Isobe, I. Kojouharov, W. Korten, T. Kubo, S. Kubono, T. Kurtukián Nieto, N. Kurz, J. Lee, S. Lenzi, J. Liu, T. Lokotko, D. Lubos, C. Magron, A. Montaner-Pizá, D. R. Napoli, H. Sakurai, H. Schaffner, Y. Shimizu, C. Sidong, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, Y. Takei, M. Tanaka, and S. Yagi
Subjects: Physics, Spins, 010308 nuclear & particles physics, Branching fraction, Time decay, Prolate spheroid, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Pi, Atomic physics, 010306 general physics, Ground state, Excitation
Abstract: The $\beta$ decay of the odd-odd nucleus $^{70}$Br has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The $T=0$ ($J^{\pi}=9^+$) and $T=1$ ($J^{\pi}=0^+$) isomers have both been produced in in-flight fragmentation of $^{78}$Kr with ratios of 41.6(8)\% and 58.4(8)\%, respectively. A half-life of $t_{1/2}=2157^{+53}_{-49}$ ms has been measured for the $J^{\pi}=9^+$ isomer from $\gamma$-ray time decay analysis. Based on this result, we provide a new value of the half-life for the $J^{\pi}=0^+$ ground state of $^{70}$Br, $t_{1/2}=78.42\pm0.51$ ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the $2^+_1$ state in the daughter nucleus $^{70}$Se, $R(2^+_1)=1.3\pm1.1\%$. We also report four new low-intensity $\gamma$-ray transitions at 661, 1103, 1561, and 1749 keV following the $\beta$ decay of the $J^{\pi}=9^+$ isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in $^{70}$Se with most probable spins and parities of $J^{\pi}=(6^+)$ and $(8^+)$, respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.
Published: 2017
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35. 94 β -Decay Half-Lives of Neutron-Rich Cs55 to Ho67 : Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation

Author: J. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, P.-H. Regan, G. S. Simpson, P.-A. Söderström, P. M. Walker, H. Watanabe, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, N. Fukuda, G. Gey, T. Isobe, Z. Korkulu, P. S. Lee, J. J. Liu, Z. Li, Z. Patel, V. Phong, S. Rice, H. Sakurai, L. Sinclair, T. Sumikama, M. Tanaka, A. Yagi, Y. L. Ye, R. Yokoyama, G. X. Zhang, D. S. Ahn, T. Alharbi, N. Aoi, F. L. Bello Garrote, G. Benzoni, A. M. Bruce, R. J. Carroll, K. Y. Chae, Z. Dombradi, A. Estrade, A. Gottardo, C. J. Griffin, N. Inabe, D. Kameda, H. Kanaoka, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, T. Lokotko, G. Lotay, C.-B. Moon, D. Murai, H. Nishibata, I. Nishizuka, C. R. Nita, A. Odahara, Zs. Podolyák, O. J. Roberts, H. Schaffner, C. Shand, Y. Shimizu, H. Suzuki, H. Takeda, J. Taprogge, S. Terashima, Z. Vajta, and S. Yoshida
Subjects: Physics, Radionuclide, 010308 nuclear & particles physics, Rare earth, Analytical chemistry, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Ionizing radiation, Nuclear physics, 0103 physical sciences, Nuclear astrophysics, r-process, Neutron, 010306 general physics, Beam (structure)
Abstract: the beta-decay half-lives of 94 neutron-rich nuclei 144-151Cs; 146-155Ba; 148-156La; 150-158Ce; 153-160Pr; 156-162Nd; 159-163Pm; 160-166Sm; 161-168eu; 165-170Gd, 166-172Tb; 169-173Dy; 172-175Ho, and 2 isomeric states 174mEr and 172mDy were measured at the Radioactive Isotope Beam Factory providing a new experimental basis to test theoetical models. Strikingl large drops of beta-decay half-lives are observed at neutron-number N=97 for Ce, Pr, Nd and Sm and N=105 for eu, Gd, Tb and Dy.
Published: 2017
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36. Invariant Mass Spectroscopy of 23O via the (p, p′) Reaction in Inverse Kinematics

Author: Hiroyoshi Sakurai, F. Delaunay, Y. Nakayama, T. Zheng, Satoshi Takeuchi, T. Honda, N. A. Orr, Y. Satou, Dóra Sohler, N. Kobayashi, H. Bhang, Kanenobu Tanaka, Hideaki Otsu, Y. Miyashita, Masafumi Matsushita, Y. Kawada, S. Choi, F M Marques, Yosuke Kondo, K. Yoshinaga, Jongwon Hwang, M. Ishihara, J. Gibelin, T. Kobayashi, Tohru Motobayashi, K. Tshoo, Z X Cao, Yasuhiro Togano, S. Deguchi, T. Sumikama, Z. H. Li, Takashi Nakamura, Kenichiro Yoneda, Susumu Shimoura, N. Tanaka, Nori Aoi, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Inverse kinematics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Atomic and Molecular Physics, and Optics, 0103 physical sciences, Invariant mass, Neutron, Atomic physics, 010306 general physics, Nucleon, Spectroscopy, Nuclear Experiment
Abstract: The neutron-rich oxygen isotope O-23 has been investigated via proton inelastic scattering on a liquid hydrogen target at 63.5 MeV/nucleon. The invariant mass method in inverse kinematics was employed to reconstruct the energy spectrum. A sharp resonance state was observed at 42(5) keV above the neutron threshold. A comparison of the differential cross section leading to this state with a microscopic DWBA calculation allowed a J (pi) assignment of 5/2(+) for this state.
Published: 2013
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37. Shell Evolution towards ^{78}Ni: Low-Lying States in ^{77}Cu

Author: E, Sahin, F L, Bello Garrote, Y, Tsunoda, T, Otsuka, G, de Angelis, A, Görgen, M, Niikura, S, Nishimura, Z Y, Xu, H, Baba, F, Browne, M-C, Delattre, P, Doornenbal, S, Franchoo, G, Gey, K, Hadyńska-Klȩk, T, Isobe, P R, John, H S, Jung, I, Kojouharov, T, Kubo, N, Kurz, Z, Li, G, Lorusso, I, Matea, K, Matsui, D, Mengoni, P, Morfouace, D R, Napoli, F, Naqvi, H, Nishibata, A, Odahara, H, Sakurai, H, Schaffner, P-A, Söderström, D, Sohler, I G, Stefan, T, Sumikama, D, Suzuki, R, Taniuchi, J, Taprogge, Z, Vajta, H, Watanabe, V, Werner, J, Wu, A, Yagi, M, Yalcinkaya, and K, Yoshinaga
Abstract: The level structure of the neutron-rich ^{77}Cu nucleus is investigated through β-delayed γ-ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of ^{77}Ni are produced by in-flight fission, separated and identified in the BigRIPS fragment separator, and implanted in the WAS3ABi silicon detector array, surrounded by Ge cluster detectors of the EURICA array. A large number of excited states in ^{77}Cu are identified for the first time by correlating γ rays with the β decay of ^{77}Ni, and a level scheme is constructed by utilizing their coincidence relationships. The good agreement between large-scale Monte Carlo shell model calculations and experimental results allows for the evaluation of the single-particle structure near ^{78}Ni and suggests a single-particle nature for both the 5/2_{1}^{-} and 3/2_{1}^{-} states in ^{77}Cu, leading to doubly magic ^{78}Ni.
Published: 2017

38. Breakup Reactions of Drip-Line Nuclei Near N = 20, 28

Author: Masamichi Ishihara, K. Yoneda, Toshiyuki Kubo, G Lee, K. Tanaka, T. Sumikama, Hiroyoshi Sakurai, T. Motobayashi, H. S. Lee, Nobuo Tanaka, Rituparna Kanungo, Tsuyoshi Ohnishi, Naohito Inabe, R. Barthelemy, Hideaki Otsu, Masafumi Matsushita, S. Deguchi, Y. Kawada, Kazutaka Takahashi, T. Sako, N. A. Orr, Michael Famiano, M. Takechi, Satoshi Takeuchi, S. K. Kim, Y. Satou, Hiroyuki Takeda, Nori Aoi, Yosuke Kondo, H. Baba, Ryuki Tanaka, N. Fukuda, Nagao Kobayashi, Yasuhiro Togano, Takashi Nakamura, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear reaction, 010308 nuclear & particles physics, Nuclear Theory, Halo nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Cross section (physics), 0103 physical sciences, Coulomb, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: International audience; The one-neutron removal cross section from 29Ne, 33,35,37Mg, and 39,41Si on a Pb target have been measured at around 240 MeV/nucleon at the RIBF (RI-Beam Factory) at RIKEN. This main goal of the experiment was to extract the inclusive Coulomb breakup cross sections in order to probe possible halo structures through their enhanced low-energy E1 strengths - so-called soft E1 excitations. The results showed significant enhancement of the one-neutron removal Coulomb breakup cross section for 37Mg. This in turn provides evidence for the existence of halo structure in 37Mg.
Published: 2013
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39. Two-Proton Radioactivity of $^{67}$Kr

Author: T, Goigoux, P, Ascher, B, Blank, M, Gerbaux, J, Giovinazzo, S, Grévy, T, Kurtukian Nieto, C, Magron, P, Doornenbal, G G, Kiss, S, Nishimura, P-A, Söderström, V H, Phong, J, Wu, D S, Ahn, N, Fukuda, N, Inabe, T, Kubo, S, Kubono, H, Sakurai, Y, Shimizu, T, Sumikama, H, Suzuki, H, Takeda, J, Agramunt, A, Algora, V, Guadilla, A, Montaner-Piza, A I, Morales, S E A, Orrigo, B, Rubio, Y, Fujita, M, Tanaka, W, Gelletly, P, Aguilera, F, Molina, F, Diel, D, Lubos, G, de Angelis, D, Napoli, C, Borcea, A, Boso, R B, Cakirli, E, Ganioglu, J, Chiba, D, Nishimura, H, Oikawa, Y, Takei, S, Yagi, K, Wimmer, G, de France, S, Go, B A, Brown, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from ^{67}Kr. At the same time, no evidence for 2p emission of ^{59}Ge and ^{63}Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to ^{67}Kr as being the best new candidate among the three for two-proton radioactivity. ^{67}Kr is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of ^{67}Kr is 7.4(30) ms.
Published: 2016
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40. 94 β-Decay Half-Lives of Neutron-Rich _{55}Cs to _{67}Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation

Author: J, Wu, S, Nishimura, G, Lorusso, P, Möller, E, Ideguchi, P-H, Regan, G S, Simpson, P-A, Söderström, P M, Walker, H, Watanabe, Z Y, Xu, H, Baba, F, Browne, R, Daido, P, Doornenbal, Y F, Fang, G, Gey, T, Isobe, P S, Lee, J J, Liu, Z, Li, Z, Korkulu, Z, Patel, V, Phong, S, Rice, H, Sakurai, L, Sinclair, T, Sumikama, M, Tanaka, A, Yagi, Y L, Ye, R, Yokoyama, G X, Zhang, T, Alharbi, N, Aoi, F L, Bello Garrote, G, Benzoni, A M, Bruce, R J, Carroll, K Y, Chae, Z, Dombradi, A, Estrade, A, Gottardo, C J, Griffin, H, Kanaoka, I, Kojouharov, F G, Kondev, S, Kubono, N, Kurz, I, Kuti, S, Lalkovski, G J, Lane, E J, Lee, T, Lokotko, G, Lotay, C-B, Moon, H, Nishibata, I, Nishizuka, C R, Nita, A, Odahara, Zs, Podolyák, O J, Roberts, H, Schaffner, C, Shand, J, Taprogge, S, Terashima, Z, Vajta, and S, Yoshida
Abstract: The β-decay half-lives of 94 neutron-rich nuclei ^{144-151}Cs, ^{146-154}Ba, ^{148-156}La, ^{150-158}Ce, ^{153-160}Pr, ^{156-162}Nd, ^{159-163}Pm, ^{160-166}Sm, ^{161-168}Eu, ^{165-170}Gd, ^{166-172}Tb, ^{169-173}Dy, ^{172-175}Ho, and two isomeric states ^{174m}Er, ^{172m}Dy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for _{58}Ce, _{59}Pr, _{60}Nd, and _{62}Sm, and N=105 for _{63}Eu, _{64}Gd, _{65}Tb, and _{66}Dy. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.
Published: 2016

41. Two-proton radioactivity of $^{67}$Kr

Author: T. Goigoux, P. Ascher, B. Blank, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian Nieto, C. Magron, J. Agramunt, A. Algora, V. Guadilla, A. Montaner-Piza, A. I. Morales, S. E. A. Orrigo, B. Rubio, D. S. Ahn, P. Doornenbal, N. Fukuda, N. Inabe, G. G. Kiss, T. Kubo, S. Kubono, S. Nishimura, H. Sakurai, Y. Shimizu, C. Sidong, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, P. Vi, J. Wu, Y. Fujita, M. Tanaka, W. Gelletly, P. Aguilera, F. Molina, F. Diel, D. Lubos, G. de Angelis, D. Napoli, C. Borcea, A. Boso, R. B. Cakirli, E. Ganioglu, J. Chiba, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, K. Wimmer, G. de France, S. Go, B. A. Brown, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Yu. E. Penionzhkevich, Yu.G. Sobolev, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, RIKEN, Proton, 010308 nuclear & particles physics, Radiochemistry, EURICA, Two-proton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, WAS3ABi, Radioactivity, 0103 physical sciences, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2016
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42. New Isotopes and Proton Emitters–Crossing the Drip Line in the Vicinity ofSn100

Author: I. Čeliković, M. Lewitowicz, R. Gernhäuser, R. Krücken, S. Nishimura, H. Sakurai, D.S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, Y.-K. Kim, Y. K. Kwon, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, D. Lubos, K. Moschner, D. Murai, I. Nishizuka, J. Park, Z. Patel, M. Rajabali, S. Rice, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Xu
Subjects: Physics, Range (particle radiation), Isotope, Proton, 010308 nuclear & particles physics, Center (category theory), General Physics and Astronomy, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Production (computer science), Atomic physics, 010306 general physics, Line (formation)
Abstract: Several new isotopes, ^{96}In, ^{94}Cd, ^{92}Ag, and ^{90}Pd, have been identified at the RIKEN Nishina Center. The study of proton drip-line nuclei in the vicinity of ^{100}Sn led to the discovery of new proton emitters ^{93}Ag and ^{89}Rh with half-lives in the submicrosecond range. The systematics of the half-lives of odd-Z nuclei with T_{z}=-1/2 toward ^{99}Sn shows a stabilizing effect of the Z=50 shell closure. Production cross sections for nuclei in the vicinity of ^{100}Sn measured at different energies and target thicknesses were compared to the cross sections calculated by epax taking into account contributions of secondary reactions in the primary target.
Published: 2016
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43. Interaction cross sections for Ne isotopes towards the island of inversion and halo structures of 29Ne and 31Ne

Author: I. Hachiuma, Hiroyuki Takeda, Tetsuaki Moriguchi, M. Nagashima, Yoko Ishibashi, Rui-Jiu Chen, Takuji Izumikawa, K. Yoshida, Yu-Gang Ma, H. Suzuki, Y. Yasuda, A. Yoshida, Takashi Ohtsubo, R. Watanabe, Hiroyoshi Sakurai, Masao Ohtake, Toshiyuki Kubo, M. Winkler, Takeshi Suda, Mattias Lantz, Y. Ohkuma, Masamichi Ishihara, Kensuke Kusaka, S. Takeuchi, Toshio Suzuki, Y. Miyashita, Kensaku Matsuta, Y. Shimbara, Yoshiyuki Yanagisawa, A. Ozawa, K. Namihira, Hans Geissel, D. Nagae, Sadao Momota, K. Tanaka, D. Nishimura, Tsuyoshi Ohnishi, Naoki Fukuda, Takayuki Yamaguchi, Deqing Fang, Nori Aoi, K. Yoshinaga, T. Kuboki, K. Ogawa, M. Fukuda, Mototsugu Mihara, M. Takechi, T. Sumikama, H. Ooishi, S. Suzuki, Daisuke Kameda, Naohito Inabe, and Y. Ito
Subjects: Physics, Nuclear and High Energy Physics, Island of inversion, Nuclear Theory, Sigma, Halo nucleus, Nuclear physics, Neutron, Nuclide, Halo, Nuclear drip line, Atomic physics, Nuclear Experiment, Nucleon
Abstract: Interaction cross sections (sigma(1)) for Me isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/nucleon using BigRIPS at RIBF, RIKEN, The sigma(1) for Ne27-32 in every case exceed the systematic mass-number dependence of sigma(1) for stable nuclei, which can be explained by considering the nuclear deformation. In particular the sigma(1) for Ne-29 and Ne-31 are significantly greater than those of their neighboring nuclides. These enhancements of sigma(1) for Ne-29 and Ne-31 cannot be explained by a single-particle model calculation under the assumption that the valence neutron of Ne-29 (Ne-31) occupies the 0d(3/2) (0f(7/2)) orbital, as expected from the standard spherical shell ordering. The present data suggest an s dominant halo structure of Ne-29 and s- or p-orbital halo in Ne-31. (C) 2011 Elsevier B.V. All rights reserved.
Published: 2012
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44. Measurement of Unbound Excited States of 24O

Author: T. Sumikama, Hiroyoshi Sakurai, T. Motobayashi, Y. Satou, K. Yoneda, Nori Aoi, Franck Delaunay, Julien Gibelin, Satoshi Takeuchi, F. M. Marqués, K. Yoshinaga, Takashi Nakamura, S. Choi, Susumu Shimoura, T. Honda, Nobuo Tanaka, Kanenobu Tanaka, Y. Kawada, Y. Miyashita, Yosuke Kondo, Hideaki Otsu, Tao Zheng, N. A. Orr, S. Deguchi, Z. H. Li, Yasuhiro Togano, Masamichi Ishihara, Masafumi Matsushita, Toshio Kobayashi, Dóra Sohler, Z. X. Cao, Y. Nakayama, Nagao Kobayashi, K. Tshoo, H. C. Bhang, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Neutron-rich nuclei, Physics, 010308 nuclear & particles physics, Nuclear Theory, Nuclear structure, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Isotopes of oxygen, Fragmentation (mass spectrometry), (p, Excited state, 0103 physical sciences, p ') reaction, Physics::Accelerator Physics, Invariant mass, Atomic physics, Nuclear Experiment, 010306 general physics, Magic number
Abstract: The unbound excited states of the most neutron-rich oxygen isotope, (24)O (Z = 8, N = 16), have been investigated using the (24)O(p,p')(24)O*-->(23)O+n reaction at RIKEN, where a 63 MeV/neuclon secondary beam of (24)O was produced in a Be production target by the projectile-like fragmentation of a 95 MeV/u (40)Ar primary beam. The first 2(+) excited state was observed in the invariant mass spectrum. This experiment; will give us a deeper understanding of the new magic number at N = 16 in the neutron-rich oxygen isotopes.
Published: 2011
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45. Invariant mass spectroscopy for the neutron rich nuclei

Author: Kanenobu Tanaka, F. Delaunay, Naoki Fukuda, Takashi Sugimoto, N. Tanaka, Y. Kawada, Hooi Jin Ong, Dóra Sohler, H. Bhang, Z. H. Li, T. Honda, N. A. Orr, S. Deguchi, Masafumi Matsushita, J. Gibelin, Tohru Motobayashi, Y. Nakayama, T. Zheng, K. Tshoo, Nori Aoi, Y. Satou, Z X Cao, Yoshiyuki Yanagisawa, F M Marques, N. Kobayashi, Satoshi Takeuchi, Hideaki Otsu, S. Choi, K. Yoshinaga, T. Kobayashi, Y. Miyashita, Kenichiro Yoneda, Susumu Shimoura, T. Sumikama, Yasuhiro Togano, Takashi Nakamura, Yosuke Kondo, Yasuhiro H. Matsuda, M. Ishihara, Hiroyoshi Sakurai, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Radioactive isotope beams, Gamow-teller transition, Proton, Neutron emission, DWBA analysis, Nuclear Theory, General Physics and Astronomy, n) reactions, Isotopes of boron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, (p, 0103 physical sciences, Neutron, Invariant mass, 010306 general physics, Spectroscopy, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Invariant mass method, Momentum transfer, p ') and (p, Atomic physics, Nucleon
Abstract: The neutron-rich carbon isotopes (19,17)C and a boron isotope (14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of a charged fragment and a neutron both emitted at forward angles is employed to map the energy spectrum above the neutron decay threshold. Several resonance structures are revealed in the invariant mass spectra, and the nature for some of them is discussed from comparisons of differential cross section data with predictions of microscopic DWBA calculations based on spsdp f shell model wave functions and a recent parametrization of semi-microscopic nucleon-nucleus optical model potential (JLMB). By extrapolating the (p, n) cross sections leading to the 1(+) state at 1.27 MeV in (14)B to zero momentum transfer the Gamow-Teller transition strength is deduced. The value is found to compare well with that reported in a beta-delayed neutron emission study.
Published: 2011
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46. MEASUREMENTS OF INTERACTION CROSS SECTIONS TOWARDS NEUTRON-RICH <font>Ne</font> ISOTOPES AT RIBF

Author: Y. Miyashita, Y. Yasuda, Tsuyoshi Ohnishi, I. Hachiuma, Sadao Momota, D. Kameda, Y. Yanagisawa, Kanenobu Tanaka, K. Yoshinaga, T. Kuboki, Akira Ozawa, Naohito Inabe, M. Ohtake, R. Watanabe, K. Kusaka, K. Ogawa, Mattias Lantz, N. Fukuda, Toshimi Suda, Toshio Suzuki, Y. Ohkuma, Maya Takechi, Takayuki Yamaguchi, Nori Aoi, M. Winkler, Kenichi Yoshida, T. Sumikama, Y. Shimbara, Y. Itoh, A.c Yoshida, D. Nishimura, Shinji Suzuki, H. Takeda, H. Ohishi, Tetsuaki Moriguchi, Hans Geissel, Yoko Ishibashi, K. Namihira, Takashi Ohtsubo, T. Kubo, M. Fukuda, and Mototsugu Mihara
Subjects: Physics, Nuclear and High Energy Physics, Angular momentum, Isotope, Island of inversion, General Physics and Astronomy, Astronomy and Astrophysics, Preliminary analysis, Nuclear physics, Neutron, Halo, Atomic physics, Nucleon, Line (formation)
Abstract: Interaction cross sections (σI) for Ne isotopes from the stability line to the vicinity of neutron-drip line have been measured using the RIBF facility at RIKEN. Measurements have been performed for 20–32 Ne on C target at energies around 240 MeV/nucleon. A large enhancement of σI beyond the systematics of stable nuclei have been observed for neutron-rich Ne isotopes. The possible halo structures with lower orbital angular momentum for 29,31 Ne are discussed by the preliminary analysis.
Published: 2010
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47. Polarization creation in proton-rich 28 P via charge exchange reactions and measurement of its electric quadrupole moment

Author: M. Kanazawa, A. Kitagawa, J. Komurasaki, Ryohei Matsumiya, Xizhen Zhang, Ping Fan, Jose R. Alonso, K. Matsuta, Yongnan Zheng, Daqing Yuan, S. Sato, D. Nishimura, Dongmei Zhou, M. Torikoshi, G. F. Krebs, T. Minamisono, T. Kubo, Daisuke Kameda, T. J. M. Symons, S. Takahashi, Yi Zuo, H. Hirano, T. Sumikama, R. Yamada, Shengyun Zhu, T. Nagatomo, Mitsunori Fukuda, Y. Namiki, Toshio Suzuki, Y. Shimbara, Takuji Izumikawa, D. Ishikawa, Takashi Ohtsubo, Yoichi Nojiri, Sadao Momota, Mototsugu Mihara, and M. Nagashima
Subjects: Nuclear and High Energy Physics, Magnetic moment, Neutron magnetic moment, Chemistry, Condensed Matter Physics, Polarization (waves), Atomic and Molecular Physics, and Optics, Nuclear physics, medicine.anatomical_structure, Quadrupole, Nuclear magnetic moment, medicine, Physical and Theoretical Chemistry, Atomic physics, Nucleus, Electric field gradient, Charge exchange
Abstract: The degrees of polarization of proton rich nucleus 28P produced in charge exchange reactions 28Si + 9Be → 28P + X, and 28Si + 1H → 28P + X have been observed at 100A MeV. Utilizing thus obtained polarized nuclei, the magnetic moment of 28P was remeasured, and |μ(28P)| = 0.3115 (34) μN was obtained. β-nuclear quadrupole resonance (β-NQR) of 28P implanted in α-Al2O3 have been observed for the first time, in order to measure the electric quadrupole moment of this nucleus.
Published: 2010
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48. Precise nuclear moments of extremely proton-rich nuclus 23 Al

Author: K. Matsuta, T. Minamisono, Akihiro Yoshimi, Hirokazu Kawamura, Takeshi Inoue, Y. Hasama, Mototsugu Mihara, Mitsunori Fukuda, Tetsuaki Moriguchi, T. Sumikama, Yoko Ishibashi, T. Nagatomo, H. Iijima, Hiroaki Ueno, K. Yamada, Makoto Uchida, K. Suzuki, A. Ozawa, Koichiro Asahi, and Yuichi Ichikawa
Subjects: Coupling constant, Nuclear and High Energy Physics, Proton, Chemistry, Nuclear Theory, Resonance, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Magnetic field, Quadrupole, Physical and Theoretical Chemistry, Atomic physics, Ground state, Nuclear quadrupole resonance, Electric field gradient
Abstract: Electric quadrupole coupling constant eqQ/h of the extremely proton-rich 23Al (I π = 5/2 + , T 1/2 = 0.47 s) nucleus implanted into an Al2O3 single crystal has been measured for the first time, using the β-ray detecting nuclear quadrupole resonance method (β-NQR) in a high magnetic field. As a preliminary result, the quadrupole coupling constant was determined as |eqQ/h(23Al) | = 2.66±0.77 MHz. Using the quadrupole coupling constant of 27Al in Al2O3 as a reference, the Q moment of the ground state of 23Al was extracted as |Q(23Al)| ~ 160 mb, which is well explained by the shell model calculation in the sd-shell model space with the USD interaction.
Published: 2010
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49. Resonant neutrino scattering: An impossible experiment?

Author: T. Sumikama, Mahir S. Hussein, Wolfgang Mittig, Hiroyoshi Sakurai, H. Kimura, Masako Ogura, Hideaki Otsu, D. Suzuki, Yuichi Ichikawa, Y. Nakai, A. Shiraki, Grand Accélérateur National d'Ions Lourds (GANIL), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Elementary particle, Resonant neutrino scattering, Electronic structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Resonance (particle physics), Nuclear lifetime, Massless particle, Cross section (physics), Atomic physics, Neutrino, Valence electron, Ground state, Unstable nuclei, Solid state effects
Abstract: The experimental feasibility was investigated for the resonant scattering of monoenergetic neutrinos emitted in the two-body β decay. A simple general formula shows that the resonance cross section can be as large as of the order of 10 −17 cm 2 . The Mossbauer setup using a solid crystal was examined with a focus on the electronic structure of the emitter and the absorber. Based on realistic calculations, we show that interactions of valence electrons in the solid lead to a level broadening of the atomic ground state, which considerably suppresses the resonant scattering of neutrinos.
Published: 2010
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50. Nuclear polarization of short-lived Na isotopes maintained in single crystals for -NMR spectroscopy

Author: T. Sumikama, C. D. P. Levy, Kei Minamisono, T. Nagatomo, Masako Ogura, Kensaku Matsuta, K. P. Jackson, Tadanori Minamisono, M. Fukuda, Mototsugu Mihara, and John Behr
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Condensed matter physics, Isotope, Nuclear Theory, Analytical chemistry, Nuclear magnetic resonance spectroscopy, Polarization (waves), Optical pumping, Condensed Matter::Materials Science, Magnet, Quadrupole, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, Instrumentation
Abstract: A compact β -ray detecting nuclear magnetic/quadrupole resonance system with a permanent magnet was developed at ISAC/TRIUMF to measure ground-state electromagnetic moments of short-lived nuclei. Polarized Na beams produced using the collinear optical-pumping technique were used to demonstrate the properties of the system. The degree of nuclear polarization and the spin–lattice relaxation times of the 20,21,26,27,28Na isotopes in NaF, TiO2, LiNbO3, MgF2, ZnO, Pt, and Mg single crystals at room temperature are reported. The electric-quadrupole coupling constants of 20,21Na in TiO2, ZnO and Mg, and that of 27Na in ZnO are also reported. The quadrupole moments of 20,21Na were extracted from the electric-quadrupole coupling constants in ZnO, using the known quadrupole moment of 27Na.
Published: 2010
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