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Your search keyword '"Otsu, H."' showing total 109 results
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109 results on '"Otsu, H."'

1. Magicity versus superfluidity around $^{28}$O viewed from the study of $^{30}$F

Author

Kahlbow, J., Aumann, T., Sorlin, O., Kondo, Y., Nakamura, T., Nowacki, F., Revel, A., Achouri, N. L., Falou, H. Al, Atar, L., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Delaunay, F., Delbart, A., Deshayes, Q., Dombradi, Z., Douma, C. A., Elekes, Z., Gasparic, I., Gheller, J. -M., Gibelin, J., Gillibert, A., Harakeh, M. N., Hirayama, A., Holl, M., Horvat, A., Horvath, A., Hwang, J. W., Isobe, T., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Lindberg, S., Marques, F. M., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M., Nakano, K., Nakatsuka, N., Nilsson, T., Obertelli, A., Orr, N. A., Otsu, H., Ozaki, T., Panin, V., Paschalis, S., Rossi, D. M., Saito, A. T., Saito, T., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimada, K., Shimizu, Y., Simon, H., Sohler, D., Stuhl, L., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Uesaka, T., Wang, H., Yang, Z., Yasuda, M., and Yoneda, K.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The neutron-rich unbound fluorine isotope $^{30}$F$_{21}$ has been observed for the first time by measuring its neutron decay at the SAMURAI spectrometer (RIBF, RIKEN) in the quasi-free proton knockout reaction of $^{31}$Ne nuclei at 235 MeV/nucleon. The mass and thus one-neutron-separation energy of $^{30}$F has been determined to be $S_n = -472\pm 58 \mathrm{(stat.)} \pm 33 \mathrm{(sys.)}$ keV from the measurement of its invariant-mass spectrum. The absence of a sharp drop in $S_n$($^{30}$F) shows that the ``magic'' $N=20$ shell gap is not restored close to $^{28}$O, which is in agreement with our shell-model calculations that predict a near degeneracy between the neutron $d$ and $fp$ orbitals, with the $1p_{3/2}$ and $1p_{1/2}$ orbitals becoming more bound than the $0f_{7/2}$ one. This degeneracy and reordering of orbitals has two potential consequences: $^{28}$O behaves like a strongly superfluid nucleus with neutron pairs scattering across shells, and both $^{29,31}$F appear to be good two-neutron halo-nucleus candidates., Comment: 9 pages, 2 figures, accepted for publication in Physical Review Letters

Published
2024
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2. Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

Author

Li, P. J., Lee, J., Doornenbal, P., Chen, S., Wang, S., Obertelli, A., Chazono, Y., Holt, J. D., Hu, B. S., Ogata, K., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J-M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Boretzky, K., Caesar, C., Chung, L. X., Flavigny, F., Franchoo, S., Gasparic, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kahlbow, J., Kim, D., Koiwai, T., Kondo, Y., Körper, D., Koseoglou, P., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Miki, K., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Schindler, F., Simon, H., Söderström, P-A., Sohler, D., Takeuchi, S., Toernqvist, H., Tscheuschner, J., Vaquero, V., Wagner, V., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well studied, probing the structure of deeply bound nucleons remains a challenge. Here, we report on the first measurement of unbound states in $^{53}$Ca and $^{55}$Ca, populated from \ts{54,56}Ca($p,pn$) reactions at a beam energy of around 216 MeV/nucleon at the RIKEN Radioactive Isotopes Beam Factory. The resonance properties, partial cross sections, and momentum distributions of these unbound states were analyzed. Orbital angular momentum $l$ assignments were extracted from momentum distributions based on calculations using the distorted wave impulse approximation (DWIA) reaction model. The resonances at excitation energies of 5516(41)\,keV in $^{53}$Ca and 6000(250)\,keV in $^{55}$Ca indicate a significant $l$\, =\,3 component, providing the first experimental evidence for the $\nu 0f_{7/2}$ single-particle strength of unbound hole states in the neutron-rich Ca isotopes. The observed excitation energies and cross-sections point towards extremely localized and well separated strength distributions, with some fragmentation for the $\nu 0f_{7/2}$ orbital in $^{55}$Ca. These results are in good agreement with predictions from shell-model calculations using the effective GXPF1Bs interaction and \textit{ab initio} calculations and diverge markedly from the experimental distributions in the nickel isotones at $Z=28$., Comment: 13 pages, 7 figures

Published
2024
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3. Mass, spectroscopy and two-neutron decay of $^{16}$Be

Author

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

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

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

Published
2024

4. Constraining nucleon effective masses with flow and stopping observables from the S$\pi$RIT experiment

Author

Tsang, C. Y., Kurata-Nishimura, M., Tsang, M. B., Lynch, W. G., Zhang, Y. X., Barney, J., Estee, J., Jhang, G., Wang, R., Kaneko, M., Lee, J. W., Isobe, T., Murakami, T., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Cerizza, G., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Manfredi, J., McIntosh, A. B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Otsu, H., Pawlowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Törnqvist, H., Togano, Y., Xiao, Z. G., Yennello, S. J., Zhang, Y., and collaboration, S$π$RIT

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow ($v_1$), elliptic flow ($v_2$) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at 270 AMeV with the S$\pi$RIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, $S_0$, and slope of the symmetry energy, $L$, at saturation density, isoscalar effective mass, $m_{s}^*/m_{N}$, isovector effective mass, $m_{v}^{*}/m_{N}$ and the in-medium cross-section enhancement factor $\eta$. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the S$\pi$RIT data suggest a narrow range of preferred values for $m_{s}^*/m_{N}$, $m_{v}^{*}/m_{N}$ and $\eta$.

Published
2023
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5. Validation of the $^{10}\mathrm{Be}$ Ground-State Molecular Structure Using $^{10}\mathrm{Be}(p,p\alpha)^{6}\mathrm{He}$ Triple Differential Reaction Cross-Section Measurements

Author

Li, P. J., Beaumel, D., Lee, J., Assié, M., Chen, S., Franchoo, S., Gibelin, J., Hammache, F., Harada, T., Kanada-En'yo, Y., Kubota, Y., Leblond, S., Liang, P. F., Lokotko, T., Lyu, M., Marqués, F. M., Matsuda, Y., Ogata, K., Otsu, H., Rindel, E., Stuhl, L., Suzuki, D., Togano, Y., Tomai, T., Xu, X. X., Yoshida, K., Zenihiro, J., Achouri, N. L., Aumann, T., Baba, H., Cardella, G., Ceruti, S., Stefanescu, A. I., Corsi, A., Frotscher, A., Gao, J., Gillibert, A., Inaba, K., Isobe, T., Kawabata, T., Kitamura, N., Kobayashi, T., Kondo, Y., Kurihara, A., Liu, H. N., Miki, H., Nakamura, T., Obertelli, A., Orr, N. A., Panin, V., Sasano, M., Shimada, T., Sun, Y. L., Tanaka, J., Trache, L., Tudor, D., Uesaka, T., Wang, H., Yamada, H., Yang, Z. H., and Yasuda, M.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The cluster structure of the neutron-rich isotope $^{10}$Be has been probed via the $(p,p\alpha)$ reaction at 150 MeV/nucleon in inverse kinematics and in quasifree conditions. The populated states of $^{6}$He residues were investigated through missing mass spectroscopy. The triple differential cross-section for the ground-state transition was extracted for quasifree angle pairs ($\theta_{p}$, $\theta_{\alpha}$) and compared to distorted-wave impulse approximation reaction calculations performed in a microscopic framework using successively the Tohsaki-Horiuchi-Schuck-R\"opke product wave-function and the wave-function deduced from Antisymmetrized Molecular Dynamics calculations. The remarkable agreement between calculated and measured cross-sections in both shape and magnitude validates the molecular structure description of the $^{10}$Be ground-state, configured as an $\alpha$-$\alpha$ core with two valence neutrons occupying $\pi$-type molecular orbitals., Comment: 7 pages, 3 figures, 1 tables

Published
2023
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6. Level Structures of $^{56,58}$Ca Cast Doubt on a doubly magic $^{60}$Ca

Author

Chen, S., Browne, F., Doornenbal, P., Lee, J., Obertelli, A., Tsunoda, Y., Otsuka, T., Chazono, Y., Hagen, G., Holt, J. D., Jansen, G. R., Ogata, K., Shimizu, N., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gasparic, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Söderström, P. -A., Sohler, D., Takeuchi, S., Törnqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Gamma decays were observed in $^{56}$Ca and $^{58}$Ca following quasi-free one-proton knockout reactions from $^{57,59}$Sc beams at $\approx 200$ MeV/nucleon. For $^{56}$Ca, a $\gamma$ ray transition was measured to be 1456(12) keV, while for $^{58}$Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the $2^+_1 \rightarrow 0^+_{gs}$ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for $2^+_1$ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the $N$ = 34 shell. Its constituents, the $0f_{5/2}$ and $0g_{9/2}$ orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic $^{60}$Ca and potentially drives the dripline of Ca isotopes to $^{70}$Ca or even beyond., Comment: 8 pages, 3 figures

Published
2023
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7. Silicon tracker array for RIB experiments at SAMURAI

Author

Stefanescu, A. I., Panin, V., Trache, L., Motobayashi, T., Otsu, H., Saastamoinen, A., Uesaka, T., Stuhl, L., Tanaka, J., Tudor, D., Stefanescu, I. C., Spiridon, A. E., Yoneda, K., Baba, H., Kurokawa, M., Togano, Y., Halasz, Z., Sasano, M., Ota, S., Kubota, Y., Ahn, D. S., Kobayashi, T., Elekes, Z., Fukuda, N., Takeda, H., Kim, D., Takada, E., Suzuki, H., Yoshida, K., Shimizu, Y., Liu, H. N., Sun, Y. L., Isobe, T., Gibelin, J., Li, P. J., Zenihiro, J., Marqués, F. M., Harakeh, M. N., Kiss, G. G., Kurihara, A., Yasuda, M., Nakamura, T., Park, S., Yang, Z., Harada, T., Nishimura, M., Sato, H., Hahn, I. S., Chae, K. Y., Elson, J. M., Sobotka, L. G., and Bertulani, C. A.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, Nuclear Experiment
Abstract

This work describes a silicon tracker system developed for experiments with proton-rich radioactive ion beams at the SAMURAI superconducting spectrometer of RIBF at RIKEN. The system is designed for accurate angular reconstruction and atomic number identification of relativistic heavy ions and protons which are simultaneously produced in reactions motivated by studies of proton capture reactions of interest for nuclear astrophysics. The technical characteristics of the tracking array are described in detail as are its performance in two pilot experiments. The physics justification for such a system is also presented.

Published
2023
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8. Searching for universality of dineutron correlation at the surface of Borromean nuclei

Author

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

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The dineutron correlation is systematically studied in three different Borromean nuclei near the neutron dripline, 11Li, 14Be and 17B, via the (p, pn) knockout reaction measured at the RIBF facility in RIKEN. For the three nuclei, the correlation angle between the valence neutrons is found to be largest in the same range of intrinsic momenta, which can be associated to the nuclear surface. This result reinforces the prediction that the formation of the dineutron is universal in environments with low neutron density, such as the surface of neutron-rich Borromean nuclei.

Published
2023
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9. Intruder configurations in $^{29}$Ne at the transition into the island of inversion: Detailed structure study of $^{28}$Ne

Author

Wang, H., Yasuda, M., Kondo, Y., Nakamura, T., Tostevin, J. A., Ogata, K., Otsuka, T., Poves, A., Shimizu, N., Yoshida, K., Achouri, N. L., Falou, H. Al, Atar, L., Aumann, T., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Crawford, H. L., Delaunay, F., Delbart, A., Deshayes, Q., Dombrádi, Zs., Douma, C., Elekes, Z., Fallon, P., Gašparić, I., Gheller, J. -M., Gibelin, J., Gillibert, A., Harakeh, M. N., Hirayama, A., Hoffman, C. R., Holl, M., Horvat, A., Horváth, Á., Hwang, J. W., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Lindberg, S., Marqués, F. M., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M. A., Nakano, K., Nakatsuka, N., Nilsson, T., Obertelli, A., Santos, F. de Oliveira, Orr, N. A., Otsu, H., Ozaki, T., Panin, V., Paschalis, S., Revel, A., Rossi, D., Saito, A. T., Saito, T., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Uesaka, T., Yang, Z., and Yoneda, K.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Detailed $\gamma$-ray spectroscopy of the exotic neon isotope $^{28}$Ne has been performed for the first time using the one-neutron removal reaction from $^{29}$Ne on a liquid hydrogen target at 240~MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for $^{28}$Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder $p$-wave strength providing evidence of the breakdown of the $N=20$ and $N=28$ shell gaps. Only a weak, possible $f$-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large $p$-wave and small $f$-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.

Published
2023
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10. Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne

Author

Wang, H, Yasuda, M, Kondo, Y, Nakamura, T, Tostevin, JA, Ogata, K, Otsuka, T, Poves, A, Shimizu, N, Yoshida, K, Achouri, NL, Al Falou, H, Atar, L, Aumann, T, Baba, H, Boretzky, K, Caesar, C, Calvet, D, Chae, H, Chiga, N, Corsi, A, Crawford, HL, Delaunay, F, Delbart, A, Deshayes, Q, Dombrádi, Zs, Douma, C, Elekes, Z, Fallon, P, Gašparić, I, Gheller, J-M, Gibelin, J, Gillibert, A, Harakeh, MN, Hirayama, A, Hoffman, CR, Holl, M, Horvat, A, Horváth, Á, Hwang, JW, Isobe, T, Kahlbow, J, Kalantar-Nayestanaki, N, Kawase, S, Kim, S, Kisamori, K, Kobayashi, T, Körper, D, Koyama, S, Kuti, I, Lapoux, V, Lindberg, S, Marqués, FM, Masuoka, S, Mayer, J, Miki, K, Murakami, T, Najafi, MA, Nakano, K, Nakatsuka, N, Nilsson, T, Obertelli, A, Orr, NA, Otsu, H, Ozaki, T, Panin, V, Paschalis, S, Revel, A, Rossi, D, Saito, AT, Saito, T, Sasano, M, Sato, H, Satou, Y, Scheit, H, Schindler, F, Schrock, P, Shikata, M, Shimizu, Y, Simon, H, Sohler, D, Sorlin, O, Stuhl, L, Takeuchi, S, Tanaka, M, Thoennessen, M, Törnqvist, H, Togano, Y, Tomai, T, Tscheuschner, J, Tsubota, J, Uesaka, T, Yang, Z, and Yoneda, K

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract

Detailed γ-ray spectroscopy of the exotic neon isotope 28Ne has been performed for the first time using the one-neutron removal reaction from 29Ne on a liquid hydrogen target at 240 MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for 28Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder p-wave strength providing evidence of the breakdown of the N=20 and N=28 shell gaps. Only a weak, possible f-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large p-wave and small f-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.

Published
2023

11. Multiple Mechanisms in Proton-Induced Nucleon Removal at $\sim$100 MeV/Nucleon

Author

Pohl, T., Sun, Y. L., Obertelli, A., Lee, J., Gomez-Ramos, M., Ogata, K., Yoshida, K., Cai, B. S., Yuan, C. X., Brown, B. A., Baba, H., Beaumel, D., Corsi, A., Gao, J., Gibelin, J., Gillibert, A., Hahn, K. I., Isobe, T., Kim, D., Kondo, Y., Kobayashi, T., Kubota, Y., Li, P., Liang, P., Liu, H. N., Liu, J., Lokotko, T., Marques, F. M., Matsuda, Y., Motobayashi, T., Nakamura, T., Orr, N. A., Otsu, H., Panin, V., Park, S. Y., Sakaguchi, S., Sasano, M., Sato, H., Sakurai, H., Shimizu, Y., Stefanescu, A. I., Stuhl, L., Suzuki, D., Togano, Y., Tudor, D., Uesaka, T., Wang, H., Xu, X., Yang, Z. H., Yoneda, K., and Zenihiro, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We report on the first proton-induced single proton- and neutron-removal reactions from the neutron-deficient $^{14}$O nucleus with large Fermi-surface asymmetry $S_n-S_p$ = 18.6 MeV at $\sim$100 MeV/nucleon, a widely used energy regime for rare-isotope studies. The measured inclusive cross sections and parallel momentum distributions of the $^{13}$N and $^{13}$O residues are compared to the state-of-the-art reaction models, with nuclear structure inputs from many-body shell-model calculations. Our results provide the first quantitative contributions of multiple reaction mechanisms including the quasifree knockout, inelastic scattering and nucleon transfer processes. It is shown that the inelastic scattering and nucleon transfer, usually neglected at such energy regime, contribute about 50% and 30% to the loosely bound proton and deeply bound neutron removal, respectively. These multiple reaction mechanisms should be considered in analyses of inclusive one-nucleon removal cross sections measured at intermediate energies for quantitative investigation of single-particle strengths and correlations in atomic nuclei.

Published
2023
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12. Isoscaling in central Sn+Sn collisions at 270 MeV/u

Author

Lee, J. W., Tsang, M. B., Tsang, C. Y., Wang, R., Barney, J., Estee, J., Isobe, T., Kaneko, M., Kurata-Nishimura, M., Lynch, W. G., Murakami, T., Ono, A., Souza, S. R., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Cerizza, G., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Ieki, K., Ikeno, N., Inabe, N., Jhang, G., Kim, Y. J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H. S., Leifels, Y., Łukasik, J., Manfredi, J., McIntosh, A. B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Otsu, H., Pawłowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Togano, Y., Xiao, Z. G., Yennello, S. J., and Zhang, Y.

Subjects
Nuclear Experiment, Nuclear Theory
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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13. Border of the Island of Inversion: Unbound states in $^{29}$Ne

Author

Holl, M., Lindberg, S., Heinz, A., Kondo, Y., Nakamura, T., Tostevin, J. A., Wang, H., Nilsson, T., Achouri, N. L., Falou, H. Al, Atar, L., Aumann, T., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Crawford, H. L., Delaunay, F., Delbart, A., Deshayes, Q., Fernández, P. Díaz, Dombrádi, Z., Douma, C. A., Elekes, 13 Z., Fallon, P., Gašparić, I., Gheller, J. -M., Gibelin, J., Gillibert, A., Harakeh, M. N., Hirayama, A., Hoffman, C. R., Horvat, A., Horváth, Á., Hwang, J. W., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Marqués, F. M., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M., Nakano, K., Nakatsuka, N., Obertelli, A., Santos, F. de Oliveira, Orr, N. A., Otsu, H., Ozaki, T., Panin, V., Paschalis, S., Revel, A., Rossi, D., Saito, A. T., Saito, T. Y., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Uesaka, T., Yang, Z., Yasuda, M., and Yoneda, K.

Subjects
Nuclear Experiment
Abstract

The nucleus $^{29}$Ne is situated at the border of the island of inversion. Despite significant efforts, no bound low-lying intruder $f_{7/2}$-state, which would place $^{29}$Ne firmly inside the island of inversion, has yet been observed. Here, the first investigation of unbound states of $^{29}$Ne is reported. The states were populated in $^{30}\mathrm{Ne}(p,pn)$ and $^{30}\mathrm{Na}(p,2p)$ reactions at a beam energy of around $230$ MeV/nucleon, and analyzed in terms of their resonance properties, partial cross sections and momentum distributions. The momentum distributions are compared to calculations using the eikonal, direct reaction model, allowing $\ell$-assignments for the observed states. The lowest-lying resonance at an excitation energy of 1.48(4) MeV shows clear signs of a significant $\ell$=3-component, giving first evidence for $f_{7/2}$ single particle strength in $^{29}$Ne. The excitation energies and strengths of the observed states are compared to shell-model calculations using the sdpf-u-mix interaction, Comment: 12 pages, 14 figures, accepted for publication in Physical Review C

Published
2022
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14. A First Glimpse at the Shell Structure beyond $^{54}$Ca: Spectroscopy of $^{55}$K, $^{55}$Ca, and $^{57}$Ca

Author

Koiwai, T., Wimmer, K., Doornenbal, P., Obertelli, A., Barbieri, C., Duguet, T., Holt, J. D., Miyagi, T., Navrátil, P., Ogata, K., Shimizu, N., Somà, V., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Browne, F., f, D. Calvet, Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo v, S., Gasparic, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kim, D., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Söderström, P-A., Sohler, D., Takeuchi, S., Toernqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.

Subjects
Nuclear Experiment
Abstract

States in the $N=35$ and 37 isotopes $^{55,57}$Ca have been populated by direct proton-induced nucleon removal reactions from $^{56,58}$Sc and $^{56}$Ca beams at the RIBF. In addition, the $(p,2p)$ quasi-free single-proton removal reaction from $^{56}$Ca was studied. Excited states in $^{55}$K, $^{55}$Ca, and $^{57}$Ca were established for the first time via in-beam $\gamma$-ray spectroscopy. Results for the proton and neutron removal reactions from $^{56}$Ca to states in $^{55}$K and $^{55}$Ca for the level energies, excited state lifetimes, and exclusive cross sections agree well with state-of-the-art theoretical calculations using different approaches. The observation of a short-lived state in $^{57}$Ca suggests a transition in the calcium isotopic chain from single-particle dominated states at $N=35$ to collective excitations at $N=37$., Comment: accepted Phys. Lett. B

Published
2022
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15. Border of the island of inversion: Unbound states in Ne29

Author

Holl, M, Lindberg, S, Heinz, A, Kondo, Y, Nakamura, T, Tostevin, JA, Wang, H, Nilsson, T, Achouri, NL, Al Falou, H, Atar, L, Aumann, T, Baba, H, Boretzky, K, Caesar, C, Calvet, D, Chae, H, Chiga, N, Corsi, A, Crawford, HL, Delaunay, F, Delbart, A, Deshayes, Q, Fernández, P Díaz, Dombrádi, Z, Douma, CA, Elekes, Z, Fallon, P, Gašparić, I, Gheller, J-M, Gibelin, J, Gillibert, A, Harakeh, MN, Hirayama, A, Hoffman, CR, Horvat, A, Horváth, Á, Hwang, JW, Isobe, T, Kahlbow, J, Kalantar-Nayestanaki, N, Kawase, S, Kim, S, Kisamori, K, Kobayashi, T, Körper, D, Koyama, S, Kuti, I, Lapoux, V, Marqués, FM, Masuoka, S, Mayer, J, Miki, K, Murakami, T, Najafi, M, Nakano, K, Nakatsuka, N, Obertelli, A, de Oliveira Santos, F, Orr, NA, Otsu, H, Ozaki, T, Panin, V, Paschalis, S, Revel, A, Rossi, D, Saito, AT, Saito, TY, Sasano, M, Sato, H, Satou, Y, Scheit, H, Schindler, F, Schrock, P, Shikata, M, Shimizu, Y, Simon, H, Sohler, D, Sorlin, O, Stuhl, L, Takeuchi, S, Tanaka, M, Thoennessen, M, Törnqvist, H, Togano, Y, Tomai, T, Tscheuschner, J, Tsubota, J, Uesaka, T, Yang, Z, Yasuda, M, and Yoneda, K

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The nucleus Ne29 is situated at the border of the island of inversion. Despite significant efforts, no bound low-lying intruder f7/2 state, which would place Ne29 firmly inside the island of inversion, has yet been observed. Here, the first investigation of unbound states of Ne29 is reported. The states were populated in Ne30(p,pn) and Na30(p,2p) reactions at a beam energy of around 230 MeV/nucleon, and analyzed in terms of their resonance properties, partial cross sections, and momentum distributions. The momentum distributions are compared to calculations using the eikonal, direct reaction model, allowing ℓ assignments for the observed states. The lowest-lying resonance at an excitation energy of 1.48(4) MeV shows clear signs of a significant ℓ=3 component, giving first evidence for f7/2 single particle strength in Ne29. The excitation energies and strengths of the observed states are compared to shell-model calculations using the sdpf-u-mix interaction.

Published
2022

16. First observation of 28O

Author

Kondo, Y., Achouri, N. L., Falou, H. Al, Atar, L., Aumann, T., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Delaunay, F., Delbart, A., Deshayes, Q., Dombrádi, Zs., Douma, C. A., Ekström, A., Elekes, Z., Forssén, C., Gašparić, I., Gheller, J.-M., Gibelin, J., Gillibert, A., Hagen, G., Harakeh, M. N., Hirayama, A., Hoffman, C. R., Holl, M., Horvat, A., Horváth, Á., Hwang, J. W., Isobe, T., Jiang, W. G., Kahlbow, J., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Lindberg, S., Marqués, F. M., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M., Nakamura, T., Nakano, K., Nakatsuka, N., Nilsson, T., Obertelli, A., Ogata, K., de Oliveira Santos, F., Orr, N. A., Otsu, H., Otsuka, T., Ozaki, T., Panin, V., Papenbrock, T., Paschalis, S., Revel, A., Rossi, D., Saito, A. T., Saito, T. Y., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimizu, N., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Sun, Z. H., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Tsunoda, N., Uesaka, T., Utsuno, Y., Vernon, I., Wang, H., Yang, Z., Yasuda, M., Yoneda, K., and Yoshida, S.

Published
2023
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17. Publisher Correction: First observation of 28O

Author

Kondo, Y., Achouri, N. L., Falou, H. Al, Atar, L., Aumann, T., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Delaunay, F., Delbart, A., Deshayes, Q., Dombrádi, Zs., Douma, C. A., Ekström, A., Elekes, Z., Forssén, C., Gašparić, I., Gheller, J.-M., Gibelin, J., Gillibert, A., Hagen, G., Harakeh, M. N., Hirayama, A., Hoffman, C. R., Holl, M., Horvat, A., Horváth, Á., Hwang, J. W., Isobe, T., Jiang, W. G., Kahlbow, J., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Lindberg, S., Marqués, F. M., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M., Nakamura, T., Nakano, K., Nakatsuka, N., Nilsson, T., Obertelli, A., Ogata, K., de Oliveira Santos, F., Orr, N. A., Otsu, H., Otsuka, T., Ozaki, T., Panin, V., Papenbrock, T., Paschalis, S., Revel, A., Rossi, D., Saito, A. T., Saito, T. Y., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimizu, N., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Sun, Z. H., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Tsunoda, N., Uesaka, T., Utsuno, Y., Vernon, I., Wang, H., Yang, Z., Yasuda, M., Yoneda, K., and Yoshida, S.

Published
2023
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18. Observation of a correlated free four-neutron system

Author

Duer, M., Aumann, T., Gernhäuser, R., Panin, V., Paschalis, S., Rossi, D. M., Achouri, N. L., Ahn, D., Baba, H., Bertulani, C. A., Böhmer, M., Boretzky, K., Caesar, C., Chiga, N., Corsi, A., Cortina-Gil, D., Douma, C. A., Dufter, F., Elekes, Z., Feng, J., Fernández-Domínguez, B., Forsberg, U., Fukuda, N., Gasparic, I., Ge, Z., Gheller, J. M., Gibelin, J., Gillibert, A., Hahn, K. I., Halász, Z., Harakeh, M. N., Hirayama, A., Holl, M., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kobayashi, T., Kondo, Y., Körper, D., Koseoglou, P., Kubota, Y., Kuti, I., Li, P. J., Lehr, C., Lindberg, S., Liu, Y., Marqués, F. M., Masuoka, S., Matsumoto, M., Mayer, J., Miki, K., Monteagudo, B., Nakamura, T., Nilsson, T., Obertelli, A., Orr, N. A., Otsu, H., Park, S. Y., Parlog, M., Potlog, P. M., Reichert, S., Revel, A., Saito, A. T., Sasano, M., Scheit, H., Schindler, F., Shimoura, S., Simon, H., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Yamada, H., Yang, B., Yang, L., Yang, Z. H., Yasuda, M., Yoneda, K., Zanetti, L., Zenihiro, J., and Zhukov, M. V.

Published
2022
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20. Silicon tracker array for RIB experiments at SAMURAI

Author

Stefanescu, A. I., Panin, V., Trache, L., Motobayashi, T., Otsu, H., Saastamoinen, A., Uesaka, T., Stuhl, L., Tanaka, J., Tudor, D., Stefanescu, I. C., Spiridon, A. E., Yoneda, K., Baba, H., Kurokawa, M., Togano, Y., Halasz, Z., Sasano, M., Ota, S., Kubota, Y., Ahn, D. S., Kobayashi, T., Elekes, Z., Fukuda, N., Takeda, H., Kim, D., Takada, E., Suzuki, H., Yoshida, K., Shimizu, Y., Liu, H. N., Sun, Y. L., Isobe, T., Gibelin, J., Li, P. J., Zenihiro, J., Marqués, F. M., Harakeh, M. N., Kiss, G. G., Kurihara, A., Yasuda, M., Nakamura, T., Park, S., Yang, Z., Harada, T., Nishimura, M., Sato, H., Hahn, I. S., Chae, K. Y., Elson, J. M., Sobotka, L. G., and Bertulani, C. A.

Published
2022
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21. Mirror symmetry at far edges of stability: The cases of C8 and He8

Author

Koyama, S., primary, Suzuki, D., additional, Assié, M., additional, Lalanne, L., additional, Sorlin, O., additional, Abe, T., additional, Beaumel, D., additional, Blumenfeld, Y., additional, Caceres, L., additional, De Oliveira Santos, F., additional, Delaunay, F., additional, Flavigny, F., additional, Franchoo, S., additional, Gibelin, J., additional, Girard-Alcindor, V., additional, Guillot, J., additional, Hammache, F., additional, Kamalou, O., additional, Kamenyero, A., additional, Kitamura, N., additional, Lapoux, V., additional, Lemasson, A., additional, Matta, A., additional, Mauss, B., additional, Morfouace, P., additional, Niikura, M., additional, Otsu, H., additional, Pancin, J., additional, Roger, T., additional, Saito, T. Y., additional, Sakurai, H., additional, Stodel, C., additional, and Thomas, J-C., additional

Published
2024
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22. Neutron capture reaction cross-section of 79Se through the 79Se(d,p) reaction in inverse kinematics

Author

Imai, N., primary, Dozono, M., additional, Michimasa, S., additional, Sumikama, T., additional, Ota, S., additional, Hayakawa, S., additional, Hwang, J.W., additional, Iribe, K., additional, Iwamoto, C., additional, Kawase, S., additional, Kawata, K., additional, Kitamura, N., additional, Masuoka, S., additional, Nakano, K., additional, Schrock, P., additional, Suzuki, D., additional, Tsunoda, R., additional, Wimmer, K., additional, Ahn, D.S., additional, Beliuskina, O., additional, Chiga, N., additional, Fukuda, N., additional, Ideguchi, E., additional, Kusaka, K., additional, Miki, H., additional, Miyatake, H., additional, Nagae, D., additional, Ohmika, S., additional, Ohtake, M., additional, Ong, H.J., additional, Otsu, H., additional, Sakurai, H., additional, Shimizu, H., additional, Shimizu, Y., additional, Sun, X., additional, Suzuki, H., additional, Takaki, M., additional, Takeda, H., additional, Takeuchi, S., additional, Teranishi, T., additional, Watanabe, Y., additional, Watanabe, Y.X., additional, Yako, K., additional, Yamada, H., additional, Yamaguchi, H., additional, Yang, L., additional, Yanagihara, R., additional, Yanagisawa, Y., additional, Yoshida, K., additional, and Shimoura, S., additional

Published
2024
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23. Experimental study of ⁴n with ⁸He(p,2p) reaction

Author

Huang, S. W., Yang, H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvsit, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Elidiano, T., Lenain, C., Huang, S. W., Yang, H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvsit, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Elidiano, T., and Lenain, C.

Abstract

The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on ⁸He(p,2p)⁷H{t+⁴ n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system.

Published
2024

24. Inelastic scattering of ⁷²,⁷⁴Ni off a proton target

Author

Cortés, M L, Doornenbal, P., Obertelli, A., Pietralla, N., Werner, V., Authelet, G., Baba, H., Calvet, D., Château, F., Corsi, A., Delbart, A., Gheller, J.-M., Gillibert, A., Isobe, T., Lapoux, V., Louchart, C., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Péron, C., Peyaud, A., Pollacco, E. C., Roussé, J.-Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Browne, F., Chung, L. X., Dombradi, Zs., Franchoo, S., Giacoppo, F., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Lozeva, R., Matsui, K., Miyazaki, T., Nishimura, S., Olivier, L., Ota, S., Patel, Z., Sahin, E., Shand, C. M., Söderström, P.-A., Stefan, I., Steppenbeck, D., Sumikama, T., Suzuki, D., Vajta, Zs., Wu, J., Xu, Z., Cortés, M L, Doornenbal, P., Obertelli, A., Pietralla, N., Werner, V., Authelet, G., Baba, H., Calvet, D., Château, F., Corsi, A., Delbart, A., Gheller, J.-M., Gillibert, A., Isobe, T., Lapoux, V., Louchart, C., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Péron, C., Peyaud, A., Pollacco, E. C., Roussé, J.-Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Browne, F., Chung, L. X., Dombradi, Zs., Franchoo, S., Giacoppo, F., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Lozeva, R., Matsui, K., Miyazaki, T., Nishimura, S., Olivier, L., Ota, S., Patel, Z., Sahin, E., Shand, C. M., Söderström, P.-A., Stefan, I., Steppenbeck, D., Sumikama, T., Suzuki, D., Vajta, Zs., Wu, J., and Xu, Z.

Abstract

Inelastic scattering of ⁷²,⁷⁴Ni off a proton target was performed at RIBF, RIKEN, Japan. The isotopes were produced by the fission of ²³⁸U on a thick Beryllium target and were then selected and identified on an event-by-event basis using the BigRIPS separator. Selected isotopes were focused onto the liquid hydrogen target of the MINOS device and gamma rays from the reactions were measured with the DALI2 array. The energy of the ions in the middle of the target was 213 MeV/u. Outgoing particles were identified using the ZeroDegree spectrometer. Here, we report on the current status of the data analysis and preliminary results for the proton inelastic scattering cross sections for both isotopes.

Published
2024

25. Lifetime measurement of the ²⁶O g.s. at SAMURAI

Author

Storck, S., Caesar, C., Kahlbow, J., Panin, V., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky’, K., Chae, H., Chiga, N., Choi, S., Cortés, M. L., Cortina-Gil, D., Deshayes, Q., Doornenbal, P., Elekes, Z., Fukuda, N., Gašparić, I., Hahn, K. I., Halász, Z., Hirayama, A., Hwang, J., Inabe, N., Isobe, T., Kim, S., Kobayashi, T., Körper, D., Marques, M., Matsumoto, M., Murakami, T., Murray, I., Nakamura, T., Nilsson, T., Otsu, H., Paschalis, S., Parlog, M., Petri, M., Rossi, D., Saito, A., Sasano, M., Scheit, H., Schrock, P., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Suzuki, H., Syndikus, I., Takeda, H., Törnqvist, H., Togano, Y., Tomai, T., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., Yoneda, K. I., Storck, S., Caesar, C., Kahlbow, J., Panin, V., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky’, K., Chae, H., Chiga, N., Choi, S., Cortés, M. L., Cortina-Gil, D., Deshayes, Q., Doornenbal, P., Elekes, Z., Fukuda, N., Gašparić, I., Hahn, K. I., Halász, Z., Hirayama, A., Hwang, J., Inabe, N., Isobe, T., Kim, S., Kobayashi, T., Körper, D., Marques, M., Matsumoto, M., Murakami, T., Murray, I., Nakamura, T., Nilsson, T., Otsu, H., Paschalis, S., Parlog, M., Petri, M., Rossi, D., Saito, A., Sasano, M., Scheit, H., Schrock, P., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Suzuki, H., Syndikus, I., Takeda, H., Törnqvist, H., Togano, Y., Tomai, T., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., and Yoneda, K. I.

Abstract

The ground state of the neutron unbound nucleus ²⁶O is speculated to have a lifetime in the pico-second regime. In order to determine the decay lifetime of the ²⁶O ground state with high sensitivity and precision, a new method has been applied. The experiment was performed in December 2016 at the Superconducting Analyzer for MUlti-particle from Radio Isotope Beams (SAMURAI) at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. A ²⁷F beam was produced in the fragment separator BigRIPS and impinged on a W/Pt target ²⁶O ²⁶O outside the target. Thus, the velocity difference between the decay neutrons and the fragment 1 O delivers a characteristic spectrum from which the lifetime can be extracted.

Published
2024

26. Spectroscopy of ¹⁶B from quasi-free (p,pn) reaction with ¹⁷B

Author

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

Abstract

Spectroscopy of ¹⁶B plays an essential role in understanding the halo structure in ¹⁷B, but very limited knowledge has so far been obtained. We have carried out a kinematically complete measurement on the spectroscopy of ¹⁶B by using quasi-free (p,pn) reaction on ¹⁷B. The level scheme of ¹⁶B up to 5 MeV was made clear for the first time.

Published
2024

27. Observation of the Exotic 02+ Cluster State in He8

Author

Yang, Z. H., primary, Ye, Y. L., additional, Zhou, B., additional, Baba, H., additional, Chen, R. J., additional, Ge, Y. C., additional, Hu, B. S., additional, Hua, H., additional, Jiang, D. X., additional, Kimura, M., additional, Li, C., additional, Li, K. A., additional, Li, J. G., additional, Li, Q. T., additional, Li, X. Q., additional, Li, Z. H., additional, Lou, J. L., additional, Nishimura, M., additional, Otsu, H., additional, Pang, D. Y., additional, Pu, W. L., additional, Qiao, R., additional, Sakaguchi, S., additional, Sakurai, H., additional, Satou, Y., additional, Togano, Y., additional, Tshoo, K., additional, Wang, H., additional, Wang, S., additional, Wei, K., additional, Xiao, J., additional, Xu, F. R., additional, Yang, X. F., additional, Yoneda, K., additional, You, H. B., additional, and Zheng, T., additional

Published
2023
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28. Experimental Study of 4n by Directly Detecting the Decay Neutrons

Author

Huang, S. W., Yang, Z. H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kiyotake, S., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Lenain, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Matta, A., Mayer, J., Miki, H., Miwa, M., Monteagudo, B., Murray, I., Nakamura, T., Obertelli, A., Orr, N. A., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Simon, H., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tronchin, E., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., and Zenihiro, J.

Published
2021
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29. Production of neutron-rich nuclei in the vicinity of 78Ni: Fragmentation reactions of unstable 81Ga and 82Ge beams

Author

Sun, X.H., Wang, H., Yoneda, K., Aoi, N., Baba, H., Bednarczyk, P., Dombrádi, Zs., Doornenbal, P., Fülöp, Zs., Go, S., Hashimoto, T., Ideguchi, E., Kobayashi, K., Kondo, Y., Lee, J., Liu, H.N., Liu, W.P., Lou, J.L., Matsushita, M., Minakata, R., Motobayashi, T., Nishimura, D., Otsu, H., Sakurai, H., Shiga, Y., Shen, Y.P., Sohler, D., Steppenbeck, D., Sun, Y.L., Takeuchi, S., Tamii, A., Tanaka, R., Tian, Z.Y., Vajta, Zs., Yamamoto, T., Yang, X.F., Yang, Z.H., Ye, Y.L., Yokoyama, R., and Zenihiro, J.

Published
2024
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30. Evolution of the two-neutron configuration from 11Li to 13Li

Author

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

Published
2024
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31. Validation of the Be10 Ground-State Molecular Structure Using Be10(p,pα)He6 Triple Differential Reaction Cross-Section Measurements

Author

Li, P. J., primary, Beaumel, D., additional, Lee, J., additional, Assié, M., additional, Chen, S., additional, Franchoo, S., additional, Gibelin, J., additional, Hammache, F., additional, Harada, T., additional, Kanada-En’yo, Y., additional, Kubota, Y., additional, Leblond, S., additional, Liang, P. F., additional, Lokotko, T., additional, Lyu, M., additional, Marqués, F. M., additional, Matsuda, Y., additional, Ogata, K., additional, Otsu, H., additional, Rindel, E., additional, Stuhl, L., additional, Suzuki, D., additional, Togano, Y., additional, Tomai, T., additional, Xu, X. X., additional, Yoshida, K., additional, Zenihiro, J., additional, Achouri, N. L., additional, Aumann, T., additional, Baba, H., additional, Cardella, G., additional, Ceruti, S., additional, Stefanescu, A. I., additional, Corsi, A., additional, Frotscher, A., additional, Gao, J., additional, Gillibert, A., additional, Inaba, K., additional, Isobe, T., additional, Kawabata, T., additional, Kitamura, N., additional, Kobayashi, T., additional, Kondo, Y., additional, Kurihara, A., additional, Liu, H. N., additional, Miki, H., additional, Nakamura, T., additional, Obertelli, A., additional, Orr, N. A., additional, Panin, V., additional, Sasano, M., additional, Shimada, T., additional, Sun, Y. L., additional, Tanaka, J., additional, Trache, L., additional, Tudor, D., additional, Uesaka, T., additional, Wang, H., additional, Yamada, H., additional, Yang, Z. H., additional, and Yasuda, M., additional

Published
2023
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32. Shape coexistence in 66Se

Author

Elekes, Z., primary, Panin, V., additional, Rodríguez, T.R., additional, Sieja, K., additional, Ahn, D.S., additional, Al-Adili, A., additional, Baba, H., additional, Stefanescu, A.I., additional, Cook, K.J., additional, Dósa, Cs., additional, Fukuda, N., additional, Gao, J., additional, Gibelin, J., additional, Hahn, K.I., additional, Halász, Z., additional, Huang, S.W., additional, Isobe, T., additional, Juhász, M.M., additional, Kim, D., additional, Kobayashi, T., additional, Kondo, Y., additional, Korkulu, Z., additional, Kurihara, A., additional, Kuti, I., additional, Miki, H., additional, Miki, K., additional, Motobayashi, T., additional, Otsu, H., additional, Saastamoinen, A., additional, Sasano, M., additional, Sato, H., additional, Shimada, T., additional, Shimizu, Y., additional, Sobotka, L.G., additional, Stefanescu, I., additional, Stuhl, L., additional, Suzuki, H., additional, Takeda, H., additional, Togano, Y., additional, Tomai, T., additional, Trache, L., additional, Tudor, D., additional, Uesaka, T., additional, Utsuki, Y., additional, Wang, H., additional, Yasuda, A., additional, Yoneda, K., additional, and Yoshitome, Y., additional

Published
2023
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33. Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment

Author

Tsang, C.Y., Kurata-Nishimura, M., Tsang, M.B., Lynch, W.G., Zhang, Y.X., Barney, J., Estee, J., Jhang, G., Wang, R., Kaneko, M., Lee, J.W., Isobe, T., Murakami, T., Ahn, D.S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Cerizza, G., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Ieki, K., Inabe, N., Kim, Y.J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H.S., Leifels, Y., Łukasik, J., Manfredi, J., McIntosh, A.B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Otsu, H., Pawłowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Törnqvist, H., Togano, Y., Xiao, Z.G., Yennello, S.J., and Zhang, Y.

Published
2024
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34. Level structures of 56,58Ca cast doubt on a doubly magic 60Ca

Author

Chen, S., primary, Browne, F., additional, Doornenbal, P., additional, Lee, J., additional, Obertelli, A., additional, Tsunoda, Y., additional, Otsuka, T., additional, Chazono, Y., additional, Hagen, G., additional, Holt, J.D., additional, Jansen, G.R., additional, Ogata, K., additional, Shimizu, N., additional, Utsuno, Y., additional, Yoshida, K., additional, Achouri, N.L., additional, Baba, H., additional, Calvet, D., additional, Château, F., additional, Chiga, N., additional, Corsi, A., additional, Cortés, M.L., additional, Delbart, A., additional, Gheller, J.-M., additional, Giganon, A., additional, Gillibert, A., additional, Hilaire, C., additional, Isobe, T., additional, Kobayashi, T., additional, Kubota, Y., additional, Lapoux, V., additional, Liu, H.N., additional, Motobayashi, T., additional, Murray, I., additional, Otsu, H., additional, Panin, V., additional, Paul, N., additional, Rodriguez, W., additional, Sakurai, H., additional, Sasano, M., additional, Steppenbeck, D., additional, Stuhl, L., additional, Sun, Y.L., additional, Togano, Y., additional, Uesaka, T., additional, Wimmer, K., additional, Yoneda, K., additional, Aktas, O., additional, Aumann, T., additional, Chung, L.X., additional, Flavigny, F., additional, Franchoo, S., additional, Gasparic, I., additional, Gerst, R.-B., additional, Gibelin, J., additional, Hahn, K.I., additional, Kim, D., additional, Koiwai, T., additional, Kondo, Y., additional, Koseoglou, P., additional, Lehr, C., additional, Linh, B.D., additional, Lokotko, T., additional, MacCormick, M., additional, Moschner, K., additional, Nakamura, T., additional, Park, S.Y., additional, Rossi, D., additional, Sahin, E., additional, Söderström, P.-A., additional, Sohler, D., additional, Takeuchi, S., additional, Törnqvist, H., additional, Vaquero, V., additional, Wagner, V., additional, Wang, S., additional, Werner, V., additional, Xu, X., additional, Yamada, H., additional, Yan, D., additional, Yang, Z., additional, Yasuda, M., additional, and Zanetti, L., additional

Published
2023
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35. Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne

Author

Wang, H., primary, Yasuda, M., additional, Kondo, Y., additional, Nakamura, T., additional, Tostevin, J.A., additional, Ogata, K., additional, Otsuka, T., additional, Poves, A., additional, Shimizu, N., additional, Yoshida, K., additional, Achouri, N.L., additional, Al Falou, H., additional, Atar, L., additional, Aumann, T., additional, Baba, H., additional, Boretzky, K., additional, Caesar, C., additional, Calvet, D., additional, Chae, H., additional, Chiga, N., additional, Corsi, A., additional, Crawford, H.L., additional, Delaunay, F., additional, Delbart, A., additional, Deshayes, Q., additional, Dombrádi, Zs., additional, Douma, C., additional, Elekes, Z., additional, Fallon, P., additional, Gašparić, I., additional, Gheller, J.-M., additional, Gibelin, J., additional, Gillibert, A., additional, Harakeh, M.N., additional, Hirayama, A., additional, Hoffman, C.R., additional, Holl, M., additional, Horvat, A., additional, Horváth, Á., additional, Hwang, J.W., additional, Isobe, T., additional, Kahlbow, J., additional, Kalantar-Nayestanaki, N., additional, Kawase, S., additional, Kim, S., additional, Kisamori, K., additional, Kobayashi, T., additional, Körper, D., additional, Koyama, S., additional, Kuti, I., additional, Lapoux, V., additional, Lindberg, S., additional, Marqués, F.M., additional, Masuoka, S., additional, Mayer, J., additional, Miki, K., additional, Murakami, T., additional, Najafi, M.A., additional, Nakano, K., additional, Nakatsuka, N., additional, Nilsson, T., additional, Obertelli, A., additional, Orr, N.A., additional, Otsu, H., additional, Ozaki, T., additional, Panin, V., additional, Paschalis, S., additional, Revel, A., additional, Rossi, D., additional, Saito, A.T., additional, Saito, T., additional, Sasano, M., additional, Sato, H., additional, Satou, Y., additional, Scheit, H., additional, Schindler, F., additional, Schrock, P., additional, Shikata, M., additional, Shimizu, Y., additional, Simon, H., additional, Sohler, D., additional, Sorlin, O., additional, Stuhl, L., additional, Takeuchi, S., additional, Tanaka, M., additional, Thoennessen, M., additional, Törnqvist, H., additional, Togano, Y., additional, Tomai, T., additional, Tscheuschner, J., additional, Tsubota, J., additional, Uesaka, T., additional, Yang, Z., additional, and Yoneda, K., additional

Published
2023
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36. Level Structures of $^{56,58}$Ca Cast Doubt on a doubly magic $^{60}$Ca

Author

Chen, S, Browne, F, Doornenbal, P, Lee, J, Obertelli, A, Tsunoda, Y, Otsuka, T, Chazono, Y, Hagen, G, Holt, J.D, Jansen, G.R, Ogata, K, Shimizu, N, Utsuno, Y, Yoshida, K, Achouri, N.L, Baba, H, Calvet, D, Château, F, Chiga, N, Corsi, A, Cortés, M.L, Delbart, A, Gheller, J.-M, Giganon, A, Gillibert, A, Hilaire, C, Isobe, T, Kobayashi, T, Kubota, Y, Lapoux, V, Liu, H.N, Motobayashi, T, Murray, I, Otsu, H, Panin, V, Paul, N, Rodriguez, W, Sakurai, H, Sasano, M, Steppenbeck, D, Stuhl, L, Sun, Y.L, Togano, Y, Uesaka, T, Wimmer, K, Yoneda, K, Aktas, O, Aumann, T, Chung, L.X, Flavigny, F, Franchoo, S, Gasparic, I, Gerst, R.-B, Gibelin, J, Hahn, K.I, Kim, D, Koiwai, T, Kondo, Y, Koseoglou, P, Lehr, C, Linh, B.D, Lokotko, T, Maccormick, M, Moschner, K, Nakamura, T, Park, S.Y, Rossi, D, Sahin, E, Söderström, P.-A, Sohler, D, Takeuchi, S, Törnqvist, H, Vaquero, V, Wagner, V, Wang, S, Werner, V, Xu, X, Yamada, H, Yan, D, Yang, Z, Yasuda, M, Zanetti, L, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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), Laboratoire Kastler Brossel (LKB [Collège de France]), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory (nucl-th), [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, FOS: Physical sciences, Shell evolution, Nuclear Experiment (nucl-ex), Nuclear Experiment, Ray spectroscopy
Abstract

Gamma decays were observed in $^{56}$Ca and $^{58}$Ca following quasi-free one-proton knockout reactions from $^{57,59}$Sc beams at $\approx 200$ MeV/nucleon. For $^{56}$Ca, a $\gamma$ ray transition was measured to be 1456(12) keV, while for $^{58}$Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the $2^+_1 \rightarrow 0^+_{gs}$ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for $2^+_1$ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the $N$ = 34 shell. Its constituents, the $0f_{5/2}$ and $0g_{9/2}$ orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic $^{60}$Ca and potentially drives the dripline of Ca isotopes to $^{70}$Ca or even beyond., Comment: 8 pages, 3 figures

Published
2023

37. Shape coexistence in Se

Author

Elekes, Z., Panin, V., Rodríguez, T.R., Sieja, K., Ahn, D.S., Al-Adili, A., Baba, H., Stefanescu, A.I., Cook, K.J., Dósa, Cs., Fukuda, N., Gao, J., Gibelin, J., Hahn, K.I., Halász, Z., Huang, S.W., Isobe, T., Juhász, M.M., Kim, D., Kobayashi, T., Kondo, Y., Korkulu, Z., Kurihara, A., Kuti, I., Miki, H., Miki, K., Motobayashi, T., Otsu, H., Saastamoinen, A., Sasano, M., Sato, H., Shimada, T., Shimizu, Y., Sobotka, L.G., Stefanescu, I., Stuhl, L., Suzuki, H., Takeda, H., Togano, Y., Tomai, T., Trache, L., Tudor, D., Uesaka, T., Utsuki, Y., Wang, H., Yasuda, A., Yoneda, K., and Yoshitome, Y.

Abstract

The nuclear structure of $^{66}$Se, nucleus beyond the N=Z line on the proton-rich side of the valley of stability, was investigated by the neutron knock-out reaction $^{67}$Se($^{12}$C,X)$^{66}$Se using a $^{12}$C target. The analysis of the singles spectrum of the γ-rays emitted during the de-excitation of the populated low-lying excited states revealed two previously detected (927(4) keV, 1460(32) keV) and three new (744(6) keV, 1210(17) keV, 1661(23) keV) transitions. The 744-keV, the 1210-keV, and the 1460-keV transitions were found to be in coincidence with the one at 927 keV. The spectrum coincident with the 927-keV transition showed a further possible transition at 299(35) keV, which was obscured by significant atomic background in the singles spectrum. This transition might correspond to a peak previously reported at 273(5) keV that could not be assigned to $^{66}$Se unambiguously. Based on a comparison of the experimental data to theoretical calculations, four new excited states are proposed which suggest that $^{66}$Se exhibits shape coexistence.

Published
2023

38. Level structures of Ca cast doubt on a doubly magic Ca

Author

Chen, S., Browne, F., Doornenbal, P., Lee, J., Obertelli, A., Tsunoda, Y., Otsuka, T., Chazono, Y., Hagen, G., Holt, J.D., Jansen, G.R., Ogata, K., Shimizu, N., Utsuno, Y., Yoshida, K., Achouri, N.L., Baba, H., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M.L., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H.N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y.L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L.X., Flavigny, F., Franchoo, S., Gasparic, I., Gerst, R.B., Gibelin, J., Hahn, K.I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lehr, C., Linh, B.D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S.Y., Rossi, D., Sahin, E., Söderström, P.A., Sohler, D., Takeuchi, S., Törnqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L.

Abstract

Gamma decays were observed in $^{56}$Ca and $^{58}$Ca following quasi-free one-proton knockout reactions from $^{57,59}$Sc beams at ≈200 MeV/nucleon. For $^{56}$Ca, a γ ray transition was measured to be 1456(12) keV, while for $^{58}$Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 21+→0gs+ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 21+ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f5/2 and 0g9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic $^{60}$Ca and potentially drives the dripline of Ca isotopes to $^{70}$Ca or even beyond.

Published
2023

39. Intruder configurations in Ne at the transition into the island of inversion: Detailed structure study of Ne

Author

Wang, H., Yasuda, M., Kondo, Y., Nakamura, T., Tostevin, J.A., Ogata, K., Otsuka, T., Poves, A., Shimizu, N., Yoshida, K., Achouri, N.L., Al Falou, H., Atar, L., Aumann, T., Baba, H., Boretzky, K., Caesar, C., Calvet, D., Chae, H., Chiga, N., Corsi, A., Crawford, H.L., Delaunay, F., Delbart, A., Deshayes, Q., Dombrádi, Zs., Douma, C., Elekes, Z., Fallon, P., Gašparić, I., Gheller, J.M., Gibelin, J., Gillibert, A., Harakeh, M.N., Hirayama, A., Hoffman, C.R., Holl, M., Horvat, A., Horváth, Á., Hwang, J.W., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kawase, S., Kim, S., Kisamori, K., Kobayashi, T., Körper, D., Koyama, S., Kuti, I., Lapoux, V., Lindberg, S., Marqués, F.M., Masuoka, S., Mayer, J., Miki, K., Murakami, T., Najafi, M.A., Nakano, K., Nakatsuka, N., Nilsson, T., Obertelli, A., Orr, N.A., Otsu, H., Ozaki, T., Panin, V., Paschalis, S., Revel, A., Rossi, D., Saito, A.T., Saito, T., Sasano, M., Sato, H., Satou, Y., Scheit, H., Schindler, F., Schrock, P., Shikata, M., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Takeuchi, S., Tanaka, M., Thoennessen, M., Törnqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Uesaka, T., Yang, Z., and Yoneda, K.

Abstract

Detailed γ-ray spectroscopy of the exotic neon isotope $^{28}$Ne has been performed for the first time using the one-neutron removal reaction from $^{29}$Ne on a liquid hydrogen target at 240 MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for $^{28}$Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder p-wave strength providing evidence of the breakdown of the N=20 and N=28 shell gaps. Only a weak, possible f-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large p-wave and small f-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.

Published
2023

40. Searching for universality of dineutron correlation at the surface of Borromean nuclei

Author

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

Published
2023
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41. Multiple Mechanisms in Proton-Induced Nucleon Removal at ∼100MeV/Nucleon

Author

Pohl, T., primary, Sun, Y. L., additional, Obertelli, A., additional, Lee, J., additional, Gómez-Ramos, M., additional, Ogata, K., additional, Yoshida, K., additional, Cai, B. S., additional, Yuan, C. X., additional, Brown, B. A., additional, Baba, H., additional, Beaumel, D., additional, Corsi, A., additional, Gao, J., additional, Gibelin, J., additional, Gillibert, A., additional, Hahn, K. I., additional, Isobe, T., additional, Kim, D., additional, Kondo, Y., additional, Kobayashi, T., additional, Kubota, Y., additional, Li, P., additional, Liang, P., additional, Liu, H. N., additional, Liu, J., additional, Lokotko, T., additional, Marqués, F. M., additional, Matsuda, Y., additional, Motobayashi, T., additional, Nakamura, T., additional, Orr, N. A., additional, Otsu, H., additional, Panin, V., additional, Park, S. Y., additional, Sakaguchi, S., additional, Sasano, M., additional, Sato, H., additional, Sakurai, H., additional, Shimizu, Y., additional, Stefanescu, A. I., additional, Stuhl, L., additional, Suzuki, D., additional, Togano, Y., additional, Tudor, D., additional, Uesaka, T., additional, Wang, H., additional, Xu, X., additional, Yang, Z. H., additional, Yoneda, K., additional, and Zenihiro, J., additional

Published
2023
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42. 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

43. 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
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44. Extended p3/2 Neutron Orbital and the N=32 Shell Closure in Ca52

Author

Enciu, M., primary, Liu, H. N., additional, Obertelli, A., additional, Doornenbal, P., additional, Nowacki, F., additional, Ogata, K., additional, Poves, A., additional, Yoshida, K., additional, Achouri, N. L., additional, Baba, H., additional, Browne, F., additional, Calvet, D., additional, Château, F., additional, Chen, S., additional, Chiga, N., additional, Corsi, A., additional, Cortés, M. L., additional, Delbart, A., additional, Gheller, J-M., additional, Giganon, A., additional, Gillibert, A., additional, Hilaire, C., additional, Isobe, T., additional, Kobayashi, T., additional, Kubota, Y., additional, Lapoux, V., additional, Motobayashi, T., additional, Murray, I., additional, Otsu, H., additional, Panin, V., additional, Paul, N., additional, Rodriguez, W., additional, Sakurai, H., additional, Sasano, M., additional, Steppenbeck, D., additional, Stuhl, L., additional, Sun, Y. L., additional, Togano, Y., additional, Uesaka, T., additional, Wimmer, K., additional, Yoneda, K., additional, Aktas, O., additional, Aumann, T., additional, Chung, L. X., additional, Flavigny, F., additional, Franchoo, S., additional, Gasparic, I., additional, Gerst, R.-B., additional, Gibelin, J., additional, Hahn, K. I., additional, Kim, D., additional, Kondo, Y., additional, Koseoglou, P., additional, Lee, J., additional, Lehr, C., additional, Li, P. J., additional, Linh, B. D., additional, Lokotko, T., additional, MacCormick, M., additional, Moschner, K., additional, Nakamura, T., additional, Park, S. Y., additional, Rossi, D., additional, Sahin, E., additional, Söderström, P.-A., additional, Sohler, D., additional, Takeuchi, S., additional, Toernqvist, H., additional, Vaquero, V., additional, Wagner, V., additional, Wang, S., additional, Werner, V., additional, Xu, X., additional, Yamada, H., additional, Yan, D., additional, Yang, Z., additional, Yasuda, M., additional, and Zanetti, L., additional

Published
2022
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45. 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

46. Extended p 3 / 2 Neutron Orbital and the N = 32 Shell Closure in 52 Ca

Author

Enciu, M., Liu, H. N., Obertelli, A., Doornenbal, P., Nowacki, F., Ogata, K., Poves, A., Yoshida, K., Achouri, N. L., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J.-M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y .L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gasparic, I., Gerst, R.-B., Gibelin, J., Hahn, K. I., Kim, D., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Li, P. J., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Söderström, P.-A., Sohler, D., Takeuchi, S., Toernqvist, H., Vaquero, Victor, Wagner, V., Wang, Li, Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., Zanetti, L., RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Fundamental Research Funds for the Central Universities (China), Japan Society for the Promotion of Science, Ministerio de Ciencia e Innovación (España), Ministry of Science and Technology of Vietnam, National Research, Development and Innovation Office (Hungary), Federal Ministry of Science, Research and Economy (Germany), European Commission, Enciu, M., and Liu, H. N.

Abstract

7 pags., 3 figs., 1 tab., The one-neutron knockout from ^{52}Ca in inverse kinematics onto a proton target was performed at ∼230 MeV/nucleon combined with prompt γ spectroscopy. Exclusive quasifree scattering cross sections to bound states in ^{51}Ca and the momentum distributions corresponding to the removal of 1f_{7/2} and 2p_{3/2} neutrons were measured. The cross sections, interpreted within the distorted-wave impulse approximation reaction framework, are consistent with a shell closure at the neutron number N=32, found as strong as at N=28 and N=34 in Ca isotopes from the same observables. The analysis of the momentum distributions leads to a difference of the root-mean-square radii of the neutron 1f_{7/2} and 2p_{3/2} orbitals of 0.61(23) fm, in agreement with the modified-shell-model prediction of 0.7 fm suggesting that the large root-mean-square radius of the 2p_{3/2} orbital in neutron-rich Ca isotopes is responsible for the unexpected linear increase of the charge radius with the neutron number., We are grateful for the support of the RIKEN Nishina Center accelerator staff in the delivery of the primary beam and the BigRIPS team for preparing the secondary beams.We thank Y. Chazono for the 48Caðp; pnÞ knockout triple differential cross section calculations. M. E., H. N. L., A. O., T. A., I. G., C. L., D. R., H. T., V. W., and L. Z. acknowledge the support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Project No. 279384907–SFB 1245. H. N. L. is supported by the Fundamental Research Funds for the Central Universities. K. O. acknowledges the support by Grants-in-Aid for Scientific Research from the JSPS (No. JP21H00125). A. P. is funded by Grant No. CEX2020-001007-S funded by MCIN/AEI/10.13039/ 501100011033 and PGC-2018-94583. Y. T. acknowledges the support from the JSPS Grant-in-Aid for Scientific Research Grants No. JP21H01114. B. D. L. and L. X. C. acknowledge support from the Vietnam Ministry of Science and Technology under Grant No. ĐTCB.01/21/VKHKTHN. D. S. acknowledges the National Research, Development and Innovation Fund of Hungary via project No. K128947. F. B. was supported by the RIKEN Special Postdoctoral Researcher Program. V. W. acknowledges the BMBF Grants No. 05P21RDFN1 and No. 05P21RDFN9. The development of M. I. N. O. S. has been supported by the European Research Council through the ERC Grant No. MINOS-258567.

Published
2022

47. Discovery of Na39

Author

Ahn, D. S., primary, Amano, J., additional, Baba, H., additional, Fukuda, N., additional, Geissel, H., additional, Inabe, N., additional, Ishikawa, S., additional, Iwasa, N., additional, Komatsubara, T., additional, Kubo, T., additional, Kusaka, K., additional, Morrissey, D. J., additional, Nakamura, T., additional, Ohtake, M., additional, Otsu, H., additional, Sakakibara, T., additional, Sato, H., additional, Sherrill, B. M., additional, Shimizu, Y., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Tarasov, O. B., additional, Ueno, H., additional, Yanagisawa, Y., additional, and Yoshida, K., additional

Published
2022
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48. Isoscaling in central Sn+Sn collisions at 270 MeV/u

Author

Lee, J. W., primary, Tsang, M. B., additional, Tsang, C. Y., additional, Wang, R., additional, Barney, J., additional, Estee, J., additional, Isobe, T., additional, Kaneko, M., additional, Kurata-Nishimura, M., additional, Lynch, W. G., additional, Murakami, T., additional, Ono, A., additional, Souza, S. R., additional, Ahn, D. S., additional, Atar, L., additional, Aumann, T., additional, Baba, H., additional, Boretzky, K., additional, Brzychczyk, J., additional, Cerizza, G., additional, Chiga, N., additional, Fukuda, N., additional, Gasparic, I., additional, Hong, B., additional, Horvat, A., additional, Ieki, K., additional, Ikeno, N., additional, Inabe, N., additional, Jhang, G., additional, Kim, Y. J., additional, Kobayashi, T., additional, Kondo, Y., additional, Lasko, P., additional, Lee, H. S., additional, Leifels, Y., additional, Łukasik, J., additional, Manfredi, J., additional, McIntosh, A. B., additional, Morfouace, P., additional, Nakamura, T., additional, Nakatsuka, N., additional, Nishimura, S., additional, Otsu, H., additional, Pawłowski, P., additional, Pelczar, K., additional, Rossi, D., additional, Sakurai, H., additional, Santamaria, C., additional, Sato, H., additional, Scheit, H., additional, Shane, R., additional, Shimizu, Y., additional, Simon, H., additional, Snoch, A., additional, Sochocka, A., additional, Sumikama, T., additional, Suzuki, H., additional, Suzuki, D., additional, Takeda, H., additional, Tangwancharoen, S., additional, Togano, Y., additional, Xiao, Z. G., additional, Yennello, S. J., additional, Zhang, Y., additional, and collaboration), (the S π RIT, additional

Published
2022
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49. A first glimpse at the shell structure beyond Ca-54: Spectroscopy of K-55, Ca-55, and Ca-57

Author

Koiwai, T, Wimmer, K, Doornenbal, P, Obertelli, A, Barbieri, C, Duguet, T, Holt, JD, Miyagi, T, Navratil, P, Ogata, K, Shimizu, N, Soma, V, Utsuno, Y, Yoshida, K, Achouri, NL, Baba, H, Browne, F, Calvet, D, Chateau, F, Chen, S, Chiga, N, Corsi, A, Cortes, ML, Delbart, A, Gheller, J-M, Giganon, A, Gillibert, A, Hilaire, C, Isobe, T, Kobayashi, T, Kubota, Y, Lapoux, V, Liu, HN, Motobayashi, T, Murray, I, Otsu, H, Panin, V, Paul, N, Rodriguez, W, Sakurai, H, Sasano, M, Steppenbeck, D, Stuhl, L, Sun, YL, Togano, Y, Uesaka, T, Yoneda, K, Aktas, O, Aumann, T, Chung, LX, Flavigny, F, Franchoo, S, Gasparic, I, Gerst, R-B, Gibelin, J, Hahn, K, Kim, D, Kondo, Y, Koseoglou, P, Lee, J, Lehr, C, Linh, BD, Lokotko, T, MacCormick, M, Moschner, K, Nakamura, T, Park, SY, Rossi, D, Sahin, E, Soderstrom, P-A, Sohler, D, Takeuchi, S, Toernqvist, H, Vaquero, V, Wagner, V, Wang, S, Werner, V, Xu, X, Yamada, H, Yan, D, Yang, Z, Yasuda, M, and Zanetti, L

Subjects
MODEL, Science & Technology, Physics, Nuclear, gamma-ray spectroscopy, Physics, Physical Sciences, SCATTERING, Shell evolution, Astronomy & Astrophysics, MASSES, Physics, Particles & Fields, Radioactive beams
Abstract

ispartof: PHYSICS LETTERS B vol:827 status: published

Published
2022

50. Border of the island of inversion: Unbound states in Ne 29

Author

Holl, M, Holl, M, Lindberg, S, Heinz, A, Kondo, Y, Nakamura, T, Tostevin, JA, Wang, H, Nilsson, T, Achouri, NL, Al Falou, H, Atar, L, Aumann, T, Baba, H, Boretzky, K, Caesar, C, Calvet, D, Chae, H, Chiga, N, Corsi, A, Crawford, HL, Delaunay, F, Delbart, A, Deshayes, Q, Díaz Fernández, P, Dombrádi, Z, Douma, CA, Elekes, Z, Fallon, P, Gašparić, I, Gheller, JM, Gibelin, J, Gillibert, A, Harakeh, MN, Hirayama, A, Hoffman, CR, Horvat, A, Horváth, Hwang, JW, Isobe, T, Kahlbow, J, Kalantar-Nayestanaki, N, Kawase, S, Kim, S, Kisamori, K, Kobayashi, T, Körper, D, Koyama, S, Kuti, I, Lapoux, V, Marqués, FM, Masuoka, S, Mayer, J, Miki, K, Murakami, T, Najafi, M, Nakano, K, Nakatsuka, N, Obertelli, A, De Oliveira Santos, F, Orr, NA, Otsu, H, Ozaki, T, Panin, V, Paschalis, S, Revel, A, Rossi, D, Saito, AT, Saito, TY, Sasano, M, Sato, H, Satou, Y, Scheit, H, Schindler, F, Schrock, P, Shikata, M, Shimizu, Y, Simon, H, Sohler, D, Sorlin, O, Stuhl, L, Takeuchi, S, Tanaka, M, Thoennessen, M, Törnqvist, H, Togano, Y, Tomai, T, Tscheuschner, J, Tsubota, J, Uesaka, T, Yang, Z, Yasuda, M, Yoneda, K, Holl, M, Holl, M, Lindberg, S, Heinz, A, Kondo, Y, Nakamura, T, Tostevin, JA, Wang, H, Nilsson, T, Achouri, NL, Al Falou, H, Atar, L, Aumann, T, Baba, H, Boretzky, K, Caesar, C, Calvet, D, Chae, H, Chiga, N, Corsi, A, Crawford, HL, Delaunay, F, Delbart, A, Deshayes, Q, Díaz Fernández, P, Dombrádi, Z, Douma, CA, Elekes, Z, Fallon, P, Gašparić, I, Gheller, JM, Gibelin, J, Gillibert, A, Harakeh, MN, Hirayama, A, Hoffman, CR, Horvat, A, Horváth, Hwang, JW, Isobe, T, Kahlbow, J, Kalantar-Nayestanaki, N, Kawase, S, Kim, S, Kisamori, K, Kobayashi, T, Körper, D, Koyama, S, Kuti, I, Lapoux, V, Marqués, FM, Masuoka, S, Mayer, J, Miki, K, Murakami, T, Najafi, M, Nakano, K, Nakatsuka, N, Obertelli, A, De Oliveira Santos, F, Orr, NA, Otsu, H, Ozaki, T, Panin, V, Paschalis, S, Revel, A, Rossi, D, Saito, AT, Saito, TY, Sasano, M, Sato, H, Satou, Y, Scheit, H, Schindler, F, Schrock, P, Shikata, M, Shimizu, Y, Simon, H, Sohler, D, Sorlin, O, Stuhl, L, Takeuchi, S, Tanaka, M, Thoennessen, M, Törnqvist, H, Togano, Y, Tomai, T, Tscheuschner, J, Tsubota, J, Uesaka, T, Yang, Z, Yasuda, M, and Yoneda, K

Abstract

The nucleus Ne29 is situated at the border of the island of inversion. Despite significant efforts, no bound low-lying intruder f7/2 state, which would place Ne29 firmly inside the island of inversion, has yet been observed. Here, the first investigation of unbound states of Ne29 is reported. The states were populated in Ne30(p,pn) and Na30(p,2p) reactions at a beam energy of around 230 MeV/nucleon, and analyzed in terms of their resonance properties, partial cross sections, and momentum distributions. The momentum distributions are compared to calculations using the eikonal, direct reaction model, allowing ℓ assignments for the observed states. The lowest-lying resonance at an excitation energy of 1.48(4) MeV shows clear signs of a significant ℓ=3 component, giving first evidence for f7/2 single particle strength in Ne29. The excitation energies and strengths of the observed states are compared to shell-model calculations using the sdpf-u-mix interaction.

Published
2022

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