Search

Your search keyword '"Ogoshi, S."' showing total 331 results
Start Over Author "Ogoshi, S."
331 results on '"Ogoshi, S."'

1. First observation of 20B and 21B

Author

Leblond, S., Marqués, F. M., Gibelin, J., Orr, N. A., Kondo, Y., Nakamura, T., Bonnard, J., Michel, N., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Deshayes, Q., Doornenbal, P., Fukuda, N., Hwang, J. W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Lee, J., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., and Yoneda, K.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The most neutron-rich boron isotopes 20B and 21B have been observed for the first time following proton removal from 22N and 22C at energies around 230 MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay into 19B and one or two neutrons. Two-proton removal from 22N populated a prominent resonance-like structure in 20B at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced 1-,2- ground-state doublet predicted by the shell model. In the case of proton removal from 22C, the 19B plus one- and two-neutron channels were consistent with the population of a resonance in 21B 2.47+-0.19 MeV above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for 20,21B are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations., Comment: Accepted for publication in Physical Review Letters. Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevLett.121.262502

Published
2019
Full Text
View/download PDF

2. Single-neutron knockout from $^{20}\textrm{C}$ and the structure of $^{19}\textrm{C}$

Author

Hwang, J. W., Kim, S., Satou, Y., Orr, N. A., Kondo, Y., Nakamura, T., Gibelin, J., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., and Yoneda, K.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The low-lying unbound level structure of the halo nucleus $^{19}\textrm{C}$ has been investigated using single-neutron knockout from $^{20}\textrm{C}$ on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the forward going beam velocity $^{18}\textrm{C}$ fragment and neutrons, was found to be dominated by a very narrow near threshold ($E_\textrm{rel}$ = 0.036(1) MeV) peak. Two less strongly populated resonance-like features were also observed at $E_\textrm{rel}$ = 0.84(4) and 2.31(3) MeV, both of which exhibit characteristics consistent with neutron $p$-shell hole states. Comparisons of the energies, measured cross sections and parallel momentum distributions to the results of shell-model and eikonal reaction calculations lead to spin-parity assignments of $5/2^+_1$ and $1/2^-_1$ for the levels at $E_x$ = 0.62(9) and 2.89(10) MeV with $S_n$ = 0.58(9) MeV. Spectroscopic factors were also deduced and found to be in reasonable accord with shell-model calculations. The valence neutron configuration of the $^{20}\textrm{C}$ ground state is thus seen to include, in addition to the known $1s^2_{1/2}$ component, a significant $0d^2_{5/2}$ contribution. The level scheme of $^{19}\textrm{C}$, including significantly the $1/2^-_1$ cross-shell state, is well accounted for by the YSOX shell-model interaction developed from the monopole-based universal interaction., Comment: Physics Letters B, in press

Published
2017
Full Text
View/download PDF

3. Observation of New Neutron Resonances in

Author

Satou, Y., Kim, S., Hwang, J. W., Orr, N. A., Nakamura, T., Kondo, Y., Gibelin, J., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., Yoneda, K., Orr, N. A., editor, Ploszajczak, M., editor, Marqués, F. M., editor, and Carbonell, J., editor

Published
2020
Full Text
View/download PDF

4. Boron Isotopes at the Drip-Line: The Case

Author

Gibelin, J., Leblond, S., Marqués, F. M., Orr, N. A., Kondo, Y., Nakamura, T., Bonnard, J., Michel, N., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Hwang, J. W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Lee, J., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., Yoneda, K., Orr, N. A., editor, Ploszajczak, M., editor, Marqués, F. M., editor, and Carbonell, J., editor

Published
2020
Full Text
View/download PDF

5. Observation of New Neutron Resonances in $$^{17,19}\mathrm{C}$$

Author

Satou, Y., primary, Kim, S., additional, Hwang, J.  W., additional, Orr, N.  A., additional, Nakamura, T., additional, Kondo, Y., additional, Gibelin, J., additional, Achouri, N.  L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F. M., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2020
Full Text
View/download PDF

6. Boron Isotopes at the Drip-Line: The $${}^{19}\mathrm{B}$$ Case

Author

Gibelin, J., primary, Leblond, S., additional, Marqués, F. M., additional, Orr, N. A., additional, Kondo, Y., additional, Nakamura, T., additional, Bonnard, J., additional, Michel, N., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Hwang, J. W., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kim, S., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Lee, J., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Satou, Y., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2020
Full Text
View/download PDF

7. Unbound states in 17C and p-sd shell-model interactions

Author

Kim, S., primary, Hwang, J.W., additional, Satou, Y., additional, Orr, N.A., additional, Nakamura, T., additional, Kondo, Y., additional, Gibelin, J., additional, Achouri, N.L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F.M., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A.G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2023
Full Text
View/download PDF

8. Unbound states in C and - Shell-model Interactions

Author

Kim, S., Hwang, J.W., Satou, Y., Orr, N.A., Nakamura, T., Kondo, Y., Gibelin, J., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F.M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A.G., Vandebrouck, M., and Yoneda, K.

Abstract

Unbound states in C17 were investigated via one-neutron removal from a C18 beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of C17, above the single-neutron decay threshold, was reconstructed using invariant mass spectroscopy from the measured momenta of the C16 fragment and neutron, and was found to exhibit resonances at Er=0.52(2), 0.77(2), 1.36(1), 1.91(1), 2.22(3) and 3.20(1) MeV. The resonance at Er=0.77(2) MeV [Ex=1.51(3) MeV] was provisionally assigned as the second 5/2+ state. The two resonances at Er=1.91(1) and 3.20(1) MeV [Ex=2.65(2) and 3.94(2) MeV] were identified, through comparison of the energies, cross sections and momentum distributions with shell-model and eikonal reaction calculations, as p-shell hole states with spin-parities 1/21− and 3/21−, respectively. A detailed comparison was made with the results obtained using a range of shell-model interactions. The YSOX shell-model Hamiltonian, the cross-shell part of which is based on the monopole-based universal interaction, was found to provide a very good description of the present results and those for the neighbouring odd-A carbon isotopes – in particular for the negative parity cross-shell states.

Published
2023

9. Unbound states in $^{17}C$ and p-sd shell-model interactions

Author

Kim, S., Hwang, J. W., Satou, Y., Orr, N. A., Nakamura, T., Kondo, Y., Gibelin, J., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., Yoneda, K., 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)-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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and ANR-14-CE33-0022,EXPAND,Explorations autour de la dripline neutron(2014)

Subjects
Nuclear Theory (nucl-th), Nuclear and High Energy Physics, Cross-shell states, Shell-model Hamiltonian, Nuclear Theory, FOS: Physical sciences, One-neutron removal reaction, ddc:530, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Neutron-rich carbon isotopes
Abstract

Unbound states in 17C were investigated via one-neutron removal from a 18C beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of 17C, above the single-neutron decay threshold, was reconstructed using invariant mass spectroscopy from the measured momenta of the 16C fragment and neutron, and was found to exhibit resonances at Er=0.52(2), 0.77(2), 1.36(1), 1.91(1), 2.22(3) and 3.20(1) MeV. The resonance at Er=0.77(2) MeV [Ex=1.51(3) MeV] was provisionally assigned as the second 5/2+ state. The two resonances at Er=1.91(1) and 3.20(1) MeV [Ex=2.65(2) and 3.94(2) MeV] were identified, through comparison of the energies, cross sections and momentum distributions with shell-model and eikonal reaction calculations, as p-shell hole states with spin-parities 1/2- and 3/2-, respectively. A detailed comparison was made with the results obtained using a range of shell-model interactions. The YSOX shell-model Hamiltonian, the cross-shell part of which is based on the monopole-based universal interaction, was found to provide a very good description of the present results and those for the neighbouring odd-A carbon isotopes - in particular for the negative parity cross-shell states., Physics Letters B 836 (2023) 137629, published

Published
2023

10. Halo Structure of the Neutron-Dripline Nucleus ¹⁹B

Author

Cook, K. J., Nakamura, T., Kondo, Y., Hagino, K., Ogata, K., Saito, A. T., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Deshayes, Q., Doornenbal, P., Fukuda, N., Gibelin, J., Hwang, J. W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Muto, K., Murakami, T., Murai, D., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Orr, N. A., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tsubota, J., Tuff, A. G., Vandebrouck, M., and Yoneda, K.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The heaviest bound isotope of boron ¹⁹B has been investigated using exclusive measurements of its Coulomb dissociation, into ¹⁷B and two neutrons, in collisions with Pb at 220 MeV/nucleon. Enhanced electric dipole (E1) strength is observed just above the two-neutron decay threshold with an integrated E1 strength of B(E1)=1.64±0.06(stat)±0.12(sys) e² fm² for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that ¹⁹B has a prominent two-neutron halo. Three-body calculations that reproduce the energy spectrum indicate that the valence neutrons have a significant s-wave configuration and exhibit a dineutronlike correlation., コンパクトな新奇中性子対の新たな証拠を発見 --不安定核ビームを用いた実験と少数系理論により実現--. 京都大学プレスリリース. 2020-06-22.

Published
2020

11. Halo Structure of the Neutron-Dripline Nucleus $^{19}$B

Author

Cook, K.J., Nakamura, T., Kondo, Y., Hagino, K., Ogata, K., Saito, A.T., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Deshayes, Q., Doornenbal, P., Fukuda, N., Gibelin, J., Hwang, J.W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F.M., Minakata, R., Motobayashi, T., Muto, K., Murakami, T., Murai, D., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Orr, N.A., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tsubota, J., Tuff, A.G., Vandebrouck, M., Yoneda, K., 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), and 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)

Subjects
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

International audience; The heaviest bound isotope of boron B19 has been investigated using exclusive measurements of its Coulomb dissociation, into B17 and two neutrons, in collisions with Pb at 220 MeV/nucleon. Enhanced electric dipole (E1) strength is observed just above the two-neutron decay threshold with an integrated E1 strength of B(E1)=1.64±0.06(stat)±0.12(sys) e2 fm2 for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that B19 has a prominent two-neutron halo. Three-body calculations that reproduce the energy spectrum indicate that the valence neutrons have a significant s-wave configuration and exhibit a dineutronlike correlation.

Published
2020

12. Halo Structure of the Neutron-Dripline Nucleus B19

Author

Cook, K. J., primary, Nakamura, T., additional, Kondo, Y., additional, Hagino, K., additional, Ogata, K., additional, Saito, A. T., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Deshayes, Q., additional, Doornenbal, P., additional, Fukuda, N., additional, Gibelin, J., additional, Hwang, J. W., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kim, S., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F. M., additional, Minakata, R., additional, Motobayashi, T., additional, Muto, K., additional, Murakami, T., additional, Murai, D., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Orr, N. A., additional, Otsu, H., additional, Sato, H., additional, Satou, Y., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tsubota, J., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2020
Full Text
View/download PDF

13. First observation of $^{20}$B and $^{21}$B

Author

Leblond, S., Marqués, F.M., Gibelin, J., Orr, N.A., Kondo, Y., Nakamura, T., Bonnard, J., Michel, N., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Deshayes, Q., Doornenbal, P., Fukuda, N., Hwang, J.W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Lee, J., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A.G., Vandebrouck, M., Yoneda, K., 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), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 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
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Phase Diagram of QCD, Quark-Gluon Plasma, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

The most neutron-rich boron isotopes 20B and 21B have been observed for the first time following proton removal from 22N and 22C at energies around 230 MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay into 19B and one or two neutrons. Two-proton removal from 22N populated a prominent resonance-like structure in 20B at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced 1-,2- ground-state doublet predicted by the shell model. In the case of proton removal from 22C, the 19B plus one- and two-neutron channels were consistent with the population of a resonance in 21B 2.47+-0.19 MeV above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for 20,21B are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations., Comment: Accepted for publication in Physical Review Letters. Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevLett.121.262502

Published
2018

14. First Observation of B20 and B21

Author

Leblond, S., primary, Marqués, F. M., additional, Gibelin, J., additional, Orr, N. A., additional, Kondo, Y., additional, Nakamura, T., additional, Bonnard, J., additional, Michel, N., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Deshayes, Q., additional, Doornenbal, P., additional, Fukuda, N., additional, Hwang, J. W., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kim, S., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Lee, J., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Satou, Y., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2018
Full Text
View/download PDF

15. Cross-Shell States in 17,19C Populated via One-Neutron Knockout Reactions

Author

Satou, Y., primary, Hwang, J. W., additional, Kim, S., additional, Orr, N. A., additional, Kondo, Y., additional, Nakamura, T., additional, Gibelin, J., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F. M., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2018
Full Text
View/download PDF

17. Interaction cross section study of the two-neutron halo nucleus 22C

Author

Togano, Y., Nakamura, T., Kondo, Y., Tostevin, J.A., Saito, A.T., Gibelin, J., Orr, N.A., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Hwang, J.W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F.M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Tuff, A.G., Vandebrouck, M., and Yoneda, K.

Published
2016
Full Text
View/download PDF

18. Corrigendum to 'Single-neutron knockout from $^{20}$C and the structure of $^{20}$C' [Phys. Lett. B 769 (2017) 503–508]

Author

Hwang, J. W., Kim, S., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Satou, Y., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Orr, N. A., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Kondo, Y., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., Yoneda, K., Nakamura, T., Gibelin, J., Achouri, N. L., Aumann, T., and Baba, H.

Subjects
ddc:530
Abstract

Physics letters / B 774, 723 - (2017). doi:10.1016/j.physletb.2017.08.072, Published by North-Holland Publ., Amsterdam

Published
2017
Full Text
View/download PDF

19. Single-neutron knockout from $^{20}\textrm{C}$ and the structure of $^{19}\textrm{C}$

Author

Hwang, J.W., Kim, S., Satou, Y., Orr, N.A., Kondo, Y., Nakamura, T., Gibelin, J., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F.M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., MUTO, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A.G., Vandebrouck, M., Yoneda, K., Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -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 ), 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 ), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), and 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)

Subjects
Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Heavy-ion knockout, Shell evolution, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory (nucl-th), Invariant mass spectroscopy, Nuclear Experiment (nucl-ex), [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th]
Abstract

The low-lying unbound level structure of the halo nucleus $^{19}\textrm{C}$ has been investigated using single-neutron knockout from $^{20}\textrm{C}$ on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the forward going beam velocity $^{18}\textrm{C}$ fragment and neutrons, was found to be dominated by a very narrow near threshold ($E_\textrm{rel}$ = 0.036(1) MeV) peak. Two less strongly populated resonance-like features were also observed at $E_\textrm{rel}$ = 0.84(4) and 2.31(3) MeV, both of which exhibit characteristics consistent with neutron $p$-shell hole states. Comparisons of the energies, measured cross sections and parallel momentum distributions to the results of shell-model and eikonal reaction calculations lead to spin-parity assignments of $5/2^+_1$ and $1/2^-_1$ for the levels at $E_x$ = 0.62(9) and 2.89(10) MeV with $S_n$ = 0.58(9) MeV. Spectroscopic factors were also deduced and found to be in reasonable accord with shell-model calculations. The valence neutron configuration of the $^{20}\textrm{C}$ ground state is thus seen to include, in addition to the known $1s^2_{1/2}$ component, a significant $0d^2_{5/2}$ contribution. The level scheme of $^{19}\textrm{C}$, including significantly the $1/2^-_1$ cross-shell state, is well accounted for by the YSOX shell-model interaction developed from the monopole-based universal interaction., Physics Letters B, in press

Published
2017

20. Unbound states in 17C probed via single-neutron removal from 18C at 245 MeV/u

Author

Kim, S., primary, Hwang, J. W., additional, Satou, Y., additional, Orr, N. A., additional, Kondo, Y., additional, Nakamura, T., additional, Gibelin, J., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F. M., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2018
Full Text
View/download PDF

21. Corrigendum to “Single-neutron knockout from 20C and the structure of 19C” [Phys. Lett. B 769 (2017) 503–508]

Author

Hwang, J.W., primary, Kim, S., additional, Satou, Y., additional, Orr, N.A., additional, Kondo, Y., additional, Nakamura, T., additional, Gibelin, J., additional, Achouri, N.L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F.M., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A.G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2017
Full Text
View/download PDF

23. Single-neutron knockout from 20C and the structure of 19C

Author

Hwang, J.W., primary, Kim, S., additional, Satou, Y., additional, Orr, N.A., additional, Kondo, Y., additional, Nakamura, T., additional, Gibelin, J., additional, Achouri, N.L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F.M., additional, Minakata, R., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Ogoshi, S., additional, Otsu, H., additional, Sato, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, R., additional, Togano, Y., additional, Tuff, A.G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2017
Full Text
View/download PDF

24. Reaction Cross Section Of The Two-neutron Halo Nucleus 22C At 235 MeV/nucleon

Author

Togano, Yasuhiro, primary, Nakamura, T., additional, Kondo, Y., additional, Kobayashi, N., additional, Tanaka, R., additional, Minakata, R., additional, Ogoshi, S., additional, Nishi, S.., additional, Kanno, D.., additional, Nakashima, T., additional, Tsubota, J.., additional, T. Saito, A., additional, A. Tostevin, J., additional, A. Orr, N., additional, Gibelin, J., additional, Delaunay, F., additional, M. Marques, F., additional, L. Achouri, N., additional, Leblond, S., additional, Deshayes, Q., additional, Yoneda, K., additional, Motobayashi, T., additional, Otsu, H., additional, Isobe, T., additional, Baba, H., additional, Sato, H., additional, Shimizu, Y., additional, Kubo, T., additional, Inabe, N., additional, Fukuda, N., additional, Kameda, D., additional, Suzuki, H., additional, Takeda, H., additional, Lee, J. H., additional, Doornenbal, P., additional, Takeuchi, S., additional, Kobayashi, T., additional, Takahashi, K., additional, Muto, K., additional, Murakami, T., additional, Nakatsuka, N., additional, Sato, Yo, additional, Kim, S., additional, Hwang, J., additional, Aumann, T., additional, Murai, D., additional, Navin, A., additional, G. Tuff, A., additional, and Vandebrouck, M., additional

Published
2017
Full Text
View/download PDF

26. Spectroscopy of 17C via one-neutron knockout reaction

Author

Kim, S., Hwang, J., Satou, Y., Orr, N.A., Nakamura, T., Kondo, Y., Gibelin, J., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F.M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A.G., Vandebrouck, M., Yoneda, K.I., Elster, C., Phillips, D.R., Roberts, C.D., 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)-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), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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, 010308 nuclear & particles physics, QC1-999, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Carbon, Excitation
Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.; International audience; A spectroscopic study of 17C was performed via the one-neutron knockout reaction of 18C on a carbon target at RIKEN-RIBF. Three unbound states at excitation energies of 2.66(2), 3.16(5), and 3.97(3) MeV (preliminary) were observed. The energies are compared with shell-model calculations and existing measurements to deduce their spin-parities. From the comparison, the states at 2.66(2) and 3.97(3) MeV are suggested to be 1/2− and 3/2−, respectively. From its decay property, the state at 3.16(5) MeV is indicated to be 9/2+.

Published
2015

27. The Far Side of Boron and Beryllium

Author

Leblond, S., Gibelin, J., Orr, N.A., Ogoshi, S., Minakata, R., Kondo, Y., Nakamura, T., Tanaka, R., Achouri, N.L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Hwang, J.W., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kim, S., Kobayashi, N., Kobayashi, T., Kubo, T., Lee, J., Motobayashi, T., Murai, D., Murakami, T., MUTO, K., Nakatsuka, N., Nakashima, T., Navin, A., Nishi, S., Otsu, H., Sato, H., Satou, Y., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Togano, Y., Tuff, A.G., Vandebrouck, M., Yoneda, K., Guesnon, Sandrine, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

28. NucleusO26: A Barely Unbound System beyond the Drip Line

Author

Kondo, Y., primary, Nakamura, T., additional, Tanaka, R., additional, Minakata, R., additional, Ogoshi, S., additional, Orr, N. A., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Delaunay, F., additional, Doornenbal, P., additional, Fukuda, N., additional, Gibelin, J., additional, Hwang, J. W., additional, Inabe, N., additional, Isobe, T., additional, Kameda, D., additional, Kanno, D., additional, Kim, S., additional, Kobayashi, N., additional, Kobayashi, T., additional, Kubo, T., additional, Leblond, S., additional, Lee, J., additional, Marqués, F. M., additional, Motobayashi, T., additional, Murai, D., additional, Murakami, T., additional, Muto, K., additional, Nakashima, T., additional, Nakatsuka, N., additional, Navin, A., additional, Nishi, S., additional, Otsu, H., additional, Sato, H., additional, Satou, Y., additional, Shimizu, Y., additional, Suzuki, H., additional, Takahashi, K., additional, Takeda, H., additional, Takeuchi, S., additional, Togano, Y., additional, Tuff, A. G., additional, Vandebrouck, M., additional, and Yoneda, K., additional

Published
2016
Full Text
View/download PDF

30. New multi-disciplinary treatment modality with RALS for patients with esophageal cancer

Author

Y. Iwasa, Ogoshi S, Akihito Nishioka, Iwasa M, Yasuhiro Ogawa, Y. Ohmori, and Toki T

Subjects
Adult, Male, Cancer Research, medicine.medical_specialty, Esophageal Neoplasms, medicine.medical_treatment, Brachytherapy, Bleomycin, Antineoplastic Combined Chemotherapy Protocols, Medicine, Humans, Esophagus, Survival rate, Aged, Retrospective Studies, business.industry, Esophageal disease, General Medicine, Esophageal cancer, Middle Aged, medicine.disease, Curvatures of the stomach, Combined Modality Therapy, Surgery, Radiation therapy, Survival Rate, medicine.anatomical_structure, Oncology, Esophagectomy, Jejunostomy, Female, Radiography, Thoracic, Fluorouracil, Cisplatin, business
Abstract

Esophageal cancer is frequently found when it is already in the advanced stage and curative surgery for such cases is consequently difficult to perform. The new multi-disciplinary treatment for esophageal cancer presented here was, therefore, conceived to improve both the survival rate and quality of life of these patients. This combined treatment modality consists of limited surgery, external irradiation, intracavitary irradiation with remote-controlled after-loading system (RALS) and peri-operative chemotherapy. In the present series, 45 patients with esophageal cancer received esophagectomy and on another 11 patients bypass operation was performed. All patients were treated with this multi-disciplinary treatment after operation. A 3 cm-wide thin gastric tube was made from the greater curvature of the stomach of the patient using an autosuture apparatus (PLC55 or GIA). In the bypass operation, the jejunum was anastomosed to the original esophagus in the Roux-en Y fashion and jejunostomy was performed on the oral side of the Roux loop. A silastic tube of 9 mm inner diameter was inserted from the jejunostomy and placed into the original esophagus for the purpose of postoperative intracavitary irradiation with RALS. For the patients receiving esophagectomy, a similar silastic tube was also placed in the posterior mediastinum for intracavitary irradiation with RALS. The indication of the bypass operation was i) a tumor length longer than 9 cm on the X-ray film and/or ii) direct invasion to the aortic wall evident by CT or MRI examination. Two weeks after the operation, external irradiation to the mediastinum with Linac 10 MV X-ray, and to the bilateral cervical regions with Linac 15 MeV electron beam, was started. The irradiation doses were 30 Gy (2 Gy/day, 5 times/ week) and 48 Gy (4 Gy/day, 3 times/week), respectively. The intracavitary irradiation with RALS was started shortly before the end of the external irradiation period and was delivered from a 60 Co source. The total dose was 24 Gy (6 Gy/day, once a week) for the esophagectomized cases, and 18 Gy for the bypassed cases. Two or three weeks after the termination of the radiotherapy, chemotherapy with cisplatinum and 5-fluorouracil was performed and repeated.every 6 months for 2 years. All patients could eat normally and were discharged after finishing the first chemotherapy session. The overall 5-year survival rate was 49% for the esophagectomized cases and 11% for the bypassed cases. The longest survival time in the bypassed cases was 5 years and 4 months. Neither operative death nor severe complications were experienced during the treatment period. The results indicate that this newly developed multi-disciplinary treatment with RALS can improve the prognosis and the quality of life not only in the esophagectomized patients but also in the bypassed patients with advanced esophageal cancer.

Published
1998

32. INTERRELATIONSHIP BETWEEN THE EXPRESSION OF H-RAS P21, C-MYC AND P53 PROTEINS, AND THE INFECTION OF HIGH-RISK HUMAN PAPILLOMAVIRUSES IN JAPANESE PATIENTS WITH ESOPHAGEAL SQUAMOUS-CELL CARCINOMA

Author

Ogoshi S, Mutsuo Furihata, Yuji Ohtsuki, A Matsuoka, H Ono, and Takahashi A

Subjects
Cancer Research, Oncogene, Tumor suppressor gene, HPV infection, Cancer, General Medicine, Cell cycle, Biology, medicine.disease_cause, medicine.disease, Oncology, Cancer research, medicine, biology.protein, Immunohistochemistry, Antibody, Carcinogenesis
Abstract

The presence and distribution of increased expression of H-ras p21 protein, c-myc protein and p53 protein, or of human papillomavirus (HPV) DNA were investigated in 42 Japanese patients with esophageal squamous cell carcinoma (SCC) by immunohistochemical techniques using each protein antibody, and by in situ hybridization with fluorescein isothiocyanate (FITC)-labelled DNA. probes for HPV-16 and HPV-18. Eighteen cases were positive with H-ras p21 antibody, but only one with c-myc protein antibody. Positive reaction of the cancer cell nuclei with p53 antibody was found in 14 cases. Among these positive cases with H-ras p21 or p53 antibody, 7 were double positive. In addition, we found positive results in 7 cases with HPV-16, and 8 cases with HPV-18, including 2 double positive cases. Among them, 6 cases were also positive with H-ras p21. Only HPV infection or p53 overexpression was detected each in 7 cases. All of HPV-positive tumors were negative with p53 antibody. Moreover, among the cases with the expression of I-I-ins p21, combined cases with overexpressed p53 protein or HPV infection counted for more than 50%. Statistically, these combined cases showed worse survival rate than only H-ras p21 positive ones. Judging from these results obtained in the present study, the increased expression of H-ras p21 protein as well as p53 and/or HPV may be involved in the carcinogenesis of this kind of disease, and become apparent, when the function of p53 as a tumor suppressor gene is inhibited with overexpressed p53 protein or HPV oncoprotein, resulting in a poor prognostic indicator.

Published
1994

Catalog

Books, media, physical & digital resources
See catalog results