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347 results on '"Nagamine, S."'

1. Shape changes in the mirror nuclei $^{70}$Kr and $^{70}$Se

Author

Wimmer, K., Korten, W., Doornenbal, P., Arici, T., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Delaroche, J. -P., Doherty, D. T., Gerl, J., Gernhäuser, R., Girod, M., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Libert, J., Lubos, D., Rodríguez, T. R., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We studied the proton-rich $T_z=-1$ nucleus $^{70}$Kr through inelastic scattering at intermediate energies in order to extract the reduced transition probability, $B(E2;\;0^+ \rightarrow 2^+)$. Comparison with the other members of the $A=70$ isospin triplet, $^{70}$Br and $^{70}$Se, studied in the same experiment, shows a $3\sigma$ deviation from the expected linearity of the electromagnetic matrix elements as a function of $T_z$. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei $^{70}$Kr and $^{70}$Se contrary to the model predictions., Comment: accepted PRL

Published
2021
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2. Shape coexistence revealed in the $N=Z$ isotope $^{72}$Kr through inelastic scattering

Author

Wimmer, K., Arici, T., Korten, W., Doornenbal, P., Delaroche, J. -P., Girod, M., Libert, J., Rodríguez, T. R., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D. T., Gerl, J., Gernhäuser, R., Goigoux, T., Jenkins, D., Kiss, G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Nishimura, S., Obertelli, A., Lubos, D., Phong, V. H., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Vaquero, V., Wadsworth, R., Wu, J., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

The $N=Z=36$ nucleus $^{72}$Kr has been studied by inelastic scattering at intermediate energies. Two targets, $^{9}$Be and $^{197}$Au, were used to extract the nuclear deformation length, $\delta_\text{N}$, and the reduced $E2$ transition probability, $B(E2)$. The previously unknown non-yrast $2^+$ and $4^+$ states as well as a new candidate for the octupole $3^-$ state have been observed in the scattering on the Be target and placed in the level scheme based on $\gamma-\gamma$ coincidences. The second $2^+$ state was also observed in the scattering on the Au target and the $B(E2;\;2^+_2 \rightarrow 0^+_1)$ value could be determined for the first time. Analyzing the results in terms of a two-band mixing model shows clear evidence for a oblate-prolate shape coexistence and can be explained by a shape change from an oblate ground state to prolate deformed yrast band from the first $2^+$ state. This interpretation is corroborated by beyond mean field calculations using the Gogny D1S interaction., Comment: 12 pages, 11 figures, accepted European Physical Journal A

Published
2020
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3. Discovery of $^{68}$Br in secondary reactions of radioactive beams

Author

Wimmer, K., Doornenbal, P., Korten, W., Arici, T., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D. T., Gerl, J., Gernhaeuser, R., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

The proton-rich isotope 68Br was discovered in secondary fragmentation reactions of fast radioactive beams. Proton-rich secondary beams of 70,71,72Kr and 70Br, produced at the RIKEN Nishina Center and identified by the BigRIPS fragment separator, impinged on a secondary 9Be target. Unambiguous particle identification behind the secondary target was achieved with the ZeroDegree spectrometer. Based on the expected direct production cross sections from neighboring isotopes, the lifetime of the ground or long-lived isomeric state of 68Br was estimated. The results suggest that secondary fragmentation reactions, where relatively few nucleons are removed from the projectile, offer an alternative way to search for new isotopes, as these reactions populate preferentially low-lying states., Comment: Phys. Lett. B accepted

Published
2019
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4. Shape coexistence and isospin symmetry in $A=70$ nuclei: Spectroscopy of the $T_z = -1$ nucleus $^{70}$Kr

Author

Wimmer, K., Korten, W., Arici, T., Doornenbal, P., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D., Gerl, J., Gernhäuser, R., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

Excited states in the $T_z=-1$ nucleus $^{70}$Kr have been populated using inelastic scattering of a radioactive $^{70}$Kr beam as well as one- and two-neutron removal reactions from $^{71,72}$Kr at intermediate beam energies. The level scheme of $^{70}$Kr was constructed from the observed $\gamma$-ray transitions and coincidences. Tentative spin and parity assignments were made based on comparison with the mirror nucleus $^{70}$Se. A second $2^+$ state and a candidate for the corresponding $4^+_2$ state suggest shape coexistence in $^{70}$Kr., Comment: accepted Phys. Lett. B

Published
2018
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5. gamma-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich Kr-94,Kr-95,Kr-96

Author

Gerst, R-B, Blazhev, A., Moschner, K., Doornenbal, P., Obertelli, A., Nomura, K., Ebran, J-P, Hilaire, S., Libert, J., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Corsi, A., Delbart, A., Gheller, J-M, Giganon, A., Gillibert, A., Lapoux, V, Motobayashi, T., Niikura, M., Paul, N., Rousse, J-Y, Sakurai, H., Santamaria, C., Steppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Browne, F., Bruce, A. M., Caroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, M., Gottardo, A., Jolie, J., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Nagamine, S., Nakatsuka, N., Nita, C. R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyak, Zs, Rudigier, M., Saito, T., Shand, C., Soderstrom, P-A, Stefan, I, Vaquero, V., Werner, V, Wimmer, K., Xu, Z., Gerst, R-B, Blazhev, A., Moschner, K., Doornenbal, P., Obertelli, A., Nomura, K., Ebran, J-P, Hilaire, S., Libert, J., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Corsi, A., Delbart, A., Gheller, J-M, Giganon, A., Gillibert, A., Lapoux, V, Motobayashi, T., Niikura, M., Paul, N., Rousse, J-Y, Sakurai, H., Santamaria, C., Steppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Browne, F., Bruce, A. M., Caroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, M., Gottardo, A., Jolie, J., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Nagamine, S., Nakatsuka, N., Nita, C. R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyak, Zs, Rudigier, M., Saito, T., Shand, C., Soderstrom, P-A, Stefan, I, Vaquero, V., Werner, V, Wimmer, K., and Xu, Z.

Abstract

We report on gamma-ray spectroscopy of low-lying excited states in the neutron-rich Kr-94,Kr-95,Kr-96 isotopes measured as part of the Shell Evolution And Search for Two-plus energies At RIBF (SEASTAR) campaign at the RIKEN Radioactive Isotope Beam Factory. Excited yrast and non-yrast states were observed, and half-lives extracted via GEANT4 simulations. In Kr-94,Kr-96 candidates for the 3-1 state were identified. For Kr-95, the prompt SEASTAR data were combined with delayed spectroscopic data measured with the EURICA array to observe transitions on top of the known (7/2)(+) isomer at a level energy of 195.5(3) keV. The comparison of the new experimental results with five-dimensional collective Hamiltonian (5DCH) and mapped interacting boson model (IBM) calculations, both using the Gogny D1M interaction, could suggest oblate-prolate shape coexistence already in Kr-96.

Published
2022

6. $\ensuremath{\gamma}$-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich $^{94,95,96}\mathrm{Kr}$

Author

Gerst, R.-B., Blazhev, A., Moschner, K., Doornenbal, P., Obertelli, A., Nomura, K., Ebran, J.-P., Hilaire, S., Libert, J., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J.-M., Giganon, A., Gillibert, A., Lapoux, V., Motobayashi, T., Niikura, M., Paul, N., Roussé, J.-Y., Sakurai, H., Santamaria, C., Steppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Browne, F., Bruce, A. M., Caroll, R., Chung, L. X., Cortés, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Górska, M., Gottardo, A., Jolie, J., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Nagamine, S., Nakatsuka, N., Nita, C. R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyák, Zs., Rudigier, M., Saito, T., Shand, C., Söderström, P.-A., Stefan, I., Vaquero, V., Werner, V., Wimmer, K., and Xu, Z.

Published
2022

7. γ-ray spectroscopy of low-lying yrast and non-yrast states in neutron- rich 94,95,96Kr

Author

Gerst, R-B, Blazhev, A., Moschner, K., Doornenbal, P., Obertelli, A., Nomura, K., Ebran, J-P, Hilaire, S., Libert, J., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Corsi, A., Delbart, A., Gheller, J-M, Giganon, A., Gillibert, A., Lapoux, V, Motobayashi, T., Niikura, M., Paul, N., Rousse, J-Y, Sakurai, H., Santamaria, C., Steppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Browne, F., Bruce, A. M., Caroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, M., Gottardo, A., Jolie, J., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Nagamine, S., Nakatsuka, N., Nita, C. R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyak, Zs, Rudigier, M., Saito, T., Shand, C., Soderstrom, P-A, Stefan, I, Vaquero, V., Werner, V, Wimmer, K., and Xu, Z.

Subjects
γ-ray spectroscopy, low-lying yrast state, non-yrast state
Abstract

We report on γ -ray spectroscopy of low-lying excited states in the neutron-rich 94, 95, 96Kr isotopes measured as part of the “Shell Evolution And Search for Two-plus energies At RIBF” (SEASTAR) campaign at the RIKEN Radioactive Isotope Beam Factory. Excited yrast and non-yrast states were observed, and half-lives extracted via GEANT4 simulations. In 94, 96Kr candidates for the 3− 1 state were identified. For 95Kr, the prompt SEASTAR data were combined with delayed spectroscopic data measured with the EURICA array to observe transitions on top of the known (7/2)+ isomer at a level energy of 195.5(3) keV. The comparison of the new experimental results with five-dimensional collective Hamiltonian (5DCH) and mapped interacting boson model (IBM) calculations, both using the Gogny D1M interaction, could suggest oblate-prolate shape coexistence already in 96Kr.

Published
2022

8. γ -ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich Kr 94,95,96

Author

Gerst, R. B., Blazhev, A., Moschner, K., Doornenbal, P., Obertelli, A., Nomura, K., Ebran, J. P., Hilaire, S., Libert, J., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J. M., Giganon, A., Gillibert, A., Lapoux, V., Motobayashi, T., Niikura, M., Paul, N., Roussé, J. Y., Sakurai, H., Santamaria, C., Steppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Browne, F., Bruce, A. M., Caroll, R., Chung, L. X., Cortés, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Górska, M., Gottardo, A., Jolie, J., Jungclaus, Andrea, Lee, J., Lettmann, M., Linh, B.D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Nagamine, S., Nakatsuka, N., Nita, C.R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyák, Zs, Rudigier, M., Saito, T., Shand, C., Söderström, P. A., Stefan, I., Vaquero, Victor, Werner, V., Wimmer, K., Xu, Z., German Research Foundation, Federal Ministry of Education and Research (Germany), RIKEN Nishina Center for Accelerator-Based Science, Science and Technology Facilities Council (UK), Croatian Science Foundation, École Polytechnique Fédérale de Lausanne, National Natural Science Foundation of China, and Japan Society for the Promotion of Science

Abstract

11 pags., 16 figs., 1 tab., We report on γ-ray spectroscopy of low-lying excited states in the neutron-rich Kr94,95,96 isotopes measured as part of the "Shell Evolution And Search for Two-plus energies At RIBF"(SEASTAR) campaign at the RIKEN Radioactive Isotope Beam Factory. Excited yrast and non-yrast states were observed, and half-lives extracted via geant4 simulations. In Kr94,96 candidates for the 31- state were identified. For Kr95, the prompt SEASTAR data were combined with delayed spectroscopic data measured with the EURICA array to observe transitions on top of the known (7/2)+ isomer at a level energy of 195.5(3) keV. The comparison of the new experimental results with five-dimensional collective Hamiltonian (5DCH) and mapped interacting boson model (IBM) calculations, both using the Gogny D1M interaction, could suggest oblate-prolate shape coexistence already in Kr96., This work is supported by the Deutsche Forschungsgemeinschaft (DFG—German Research Foundation) under Grant No. BL 1513/1-1 and by the BMBF under Grants No. 05P15PKFNA, No. 05P19PKFNA, No. 05P15RDFN1, No. 05P19RDFN1, and No. 05P21RDFN1. We thank the RIKEN Nishina Centre accelerator staff and the BigRIPS team for providing the stable and high-intensity uranium beam and secondary beams, and the STFC (UK). The work of K. Nomura was supported by the Tenure Track Pilot Programme of the Croatian Science Foundation, the École Polytechnique Fédérale de Lausanne, and Project No. TTP-2018-07-3554, Exotic Nuclear Structure and Dynamics, with funds of the Croatian-Swiss Research Programme. B.D. and Z.L. were supported by the National Natural Science Foundation of China (Grants No. 12135004, No. 11635003, and No. 11961141004). R.T. was supported by JSPS Grant-in-Aid for JSPS Research Fellows JP14J08718.

Published
2022

9. γ -ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich Kr94,95,96

Author

Gerst, R.-B., primary, Blazhev, A., additional, Moschner, K., additional, Doornenbal, P., additional, Obertelli, A., additional, Nomura, K., additional, Ebran, J.-P., additional, Hilaire, S., additional, Libert, J., additional, Authelet, G., additional, Baba, H., additional, Calvet, D., additional, Château, F., additional, Chen, S., additional, Corsi, A., additional, Delbart, A., additional, Gheller, J.-M., additional, Giganon, A., additional, Gillibert, A., additional, Lapoux, V., additional, Motobayashi, T., additional, Niikura, M., additional, Paul, N., additional, Roussé, J.-Y., additional, Sakurai, H., additional, Santamaria, C., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Uesaka, T., additional, Ando, T., additional, Arici, T., additional, Browne, F., additional, Bruce, A. M., additional, Caroll, R., additional, Chung, L. X., additional, Cortés, M. L., additional, Dewald, M., additional, Ding, B., additional, Flavigny, F., additional, Franchoo, S., additional, Górska, M., additional, Gottardo, A., additional, Jolie, J., additional, Jungclaus, A., additional, Lee, J., additional, Lettmann, M., additional, Linh, B. D., additional, Liu, J., additional, Liu, Z., additional, Lizarazo, C., additional, Momiyama, S., additional, Nagamine, S., additional, Nakatsuka, N., additional, Nita, C. R., additional, Nobs, C., additional, Olivier, L., additional, Orlandi, R., additional, Patel, Z., additional, Podolyák, Zs., additional, Rudigier, M., additional, Saito, T., additional, Shand, C., additional, Söderström, P.-A., additional, Stefan, I., additional, Vaquero, V., additional, Werner, V., additional, Wimmer, K., additional, and Xu, Z., additional

Published
2022
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10. Drug-coated balloon versus drug-eluting stent following orbital atherectomy for calcified coronary artery: one-year outcomes of a retrospective cohort study

Author

Mitsui, K, primary, Lee, T, additional, Miyazaki, R, additional, Hara, N, additional, Nagamine, S, additional, Nakamura, T, additional, Terui, M, additional, Okata, S, additional, Nagase, M, additional, Nitta, G, additional, Watanabe, K, additional, Kaneko, M, additional, Nagata, Y, additional, Nozato, T, additional, and Ashikaga, T, additional

Published
2021
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11. Shape changes in the mirror nuclei $^{70}$Kr and $^{70}$Se

Author

Wimmer, K, Korten, W, Doornenbal, P, Arici, T, Aguilera, P, Algora, A, Ando, T, Baba, H, Blank, B, Boso, A, Chen, S, Corsi, A, Davies, P, de Angelis, G, de France, G, Delaroche, J-P, Doherty, D T, Gerl, J, Gernhäuser, R, Girod, M, Jenkins, D, Koyama, S, Motobayashi, T, Nagamine, S, Niikura, M, Obertelli, A, Libert, J, Lubos, D, Rodríguez, T R, Rubio, B, Sahin, E, Saito, T Y, Sakurai, H, Sinclair, L, Steppenbeck, D, Taniuchi, R, Wadsworth, R, Zielinska, M, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

We studied the proton-rich $T_z=-1$ nucleus $^{70}$Kr through inelastic scattering at intermediate energies in order to extract the reduced transition probability, $B(E2;\;0^+ \rightarrow 2^+)$. Comparison with the other members of the $A=70$ isospin triplet, $^{70}$Br and $^{70}$Se, studied in the same experiment, shows a $3\sigma$ deviation from the expected linearity of the electromagnetic matrix elements as a function of $T_z$. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei $^{70}$Kr and $^{70}$Se contrary to the model predictions., Comment: accepted PRL

Published
2021
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12. Shape Changes in the Mirror Nuclei Kr-70 and Se-70

Author

Wimmer, K., Korten, W., Doornenbal, P., Arici, T., Aguilera, P., Algora, Alejandro, Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Delaroche, J.P., Doherty, D.T., Gerl, J., Gernhäuser, R., Girod, M., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Libert, J., Lubos, D., Rodriguez, T. R., Rubio, B., Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., Zielinska, M., RIKEN Nishina Center for Accelerator-Based Science, Science and Technology Facilities Council (UK), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), and European Commission

Abstract

6 pags., 3 figs., 2 tabs., We studied the proton-rich T-z = -1 nucleus Kr-70 through inelastic scattering at intermediate energies in order to extract the reduced transition probability, B(E2; 0+ -> 2+). Comparison with the other members of the A = 70 isospin triplet, Br-70 and Se-70, studied in the same experiment, shows a 3 sigma deviation from the expected linearity of the electromagnetic matrix elements as a function of T-z. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei Kr-70 and Se-70 contrary to the model predictions., We would like to thank the RIKEN accelerator and BigRIPS teams for providing the high intensity beams. This work has been supported by UK STFC under Grants No. ST/L005727/1 and No. ST/P003885/1, the Spanish Ministerio de Economía y Competitividad under Grants No. FPA2011-24553 and No. FPA2014-52823-C2-1-P, the Program Severo Ochoa (SEV-2014-0398), and the Spanish MICINN under PGC2018-094583-B-I00. K. W. acknowledges the support from the Spanish Ministerio de Economía y Competitividad RYC-2017-22007. A. O. acknowledges the support from the European Research Council through the ERC Grant No. MINOS-258567

Published
2021

13. Shape Changes in the Mirror Nuclei Kr-70 and Se-70

Author

RIKEN Nishina Center for Accelerator-Based Science, Science and Technology Facilities Council (UK), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), European Commission, Wimmer, K., Korten, W., Doornenbal, P., Arici, T., Aguilera, P., Algora, Alejandro, Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Delaroche, J.P., Doherty, D.T., Gerl, J., Gernhäuser, R., Girod, M., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Libert, J., Lubos, D., Rodríguez, T. R., Rubio, Berta, Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., Zielinska, M., RIKEN Nishina Center for Accelerator-Based Science, Science and Technology Facilities Council (UK), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), European Commission, Wimmer, K., Korten, W., Doornenbal, P., Arici, T., Aguilera, P., Algora, Alejandro, Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Delaroche, J.P., Doherty, D.T., Gerl, J., Gernhäuser, R., Girod, M., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Libert, J., Lubos, D., Rodríguez, T. R., Rubio, Berta, Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

We studied the proton-rich T-z = -1 nucleus Kr-70 through inelastic scattering at intermediate energies in order to extract the reduced transition probability, B(E2; 0+ -> 2+). Comparison with the other members of the A = 70 isospin triplet, Br-70 and Se-70, studied in the same experiment, shows a 3 sigma deviation from the expected linearity of the electromagnetic matrix elements as a function of T-z. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei Kr-70 and Se-70 contrary to the model predictions.

Published
2021

14. Shape coexistence revealed in the N= Z isotope 72 Kr through inelastic scattering

Author

Wimmer, K., Arici, T., Korten, W., Doornenbal, P., Delaroche, J. P., Girod, M., Libert, J., Rodríguez, T. R., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D. T., Gerl, J., Gernhäuser, R., Goigoux, T., Jenkins, D., Kiss, G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Nishimura, S., Obertelli, A., Lubos, D., Phong, V. H., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Vaquero, V., Wadsworth, R., Wu, J., and Zielinska, M.

Abstract

The N= Z= 36 nucleus 72Kr has been studied by inelastic scattering at intermediate energies. Two targets, 9Be and 197Au, were used to extract the nuclear deformation length, δN, and the reduced E2 transition probability, B(E2). The previously unknown non-yrast 2 + and 4 + states as well as a new candidate for the octupole 3 - state have been observed in the scattering on the Be target and placed in the level scheme based on γ- γ coincidences. The second 2 + state was also observed in the scattering on the Au target and the B(E2;22+→01+) value could be determined for the first time. Analyzing the results in terms of a two-band mixing model shows clear evidence for a oblate-prolate shape coexistence and can be explained by a shape change from an oblate ground state to prolate deformed yrast band from the first 2 + state. This interpretation is corroborated by beyond mean field calculations using the Gogny D1S interaction.

Published
2020

15. Identification of an oblate K-isomer of 94Se60 and implications for a ground-state shape transition between N = 58 - 60

Author

Lizarazo, C., Soderstrom, P.A, Werner, V., Pietralla, N., Walker, P., Dong, G.X, Xu, F.R, Rodriguez, T.R, Browne, F., Doornenbal, P., Nishimura, S., Nita, C.R, Obertelli, A., Ando, T., Arici, T., Authelet, G., Baba, H., Blazhev, A., Bruce, A.M, Calvet, D., Caroll, R.J, Chateau, F., Chen, S., Chung, L.X, Corsi, A., Cortes, M.L, Delbart, A., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gerl, J., Gheller, J.M, Giagnon, A., Gillibert, A., Gorska, M., Gottardo, A., Kojouharov, I., Kurz, N., Lapoux, V., Lee, J., Lettmann, M., Linh, B.D, Liu, J.J, Liu, Z., Momiyama, S., Moschner, K., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Nobs, C., Olivier, L., Patel, Z., Paul, N., Podolyak, Zsolt, Rousse, J.Y, Rudigier, M., Saito, T.Y, Sakurai, H., Santamaria, C., Schaffner, H., Shand, C., Stefan, I., Steppenbeck, D., Taniuchi, R., Uesaka, T., Vaquero, V., Wimmer, K., and Xu, Z.

Subjects
Nuclear Experiment
Abstract

In this letter we report on new information on the shape evolution of the very neutron-rich 92;94Se nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed -rays emitted following the decay of these nuclei. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasi-neutron states with an oblate deformation of B ~ - 0:25, with the high-K state in 94Se being metastable and K hindered. Following this, 94Se is the lowest-mass nucleus known to date with K-forbidden decay and a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. From the decay patterns, an oblate deformation is suggested for the 94Se60 ground-state band, in line with the predictions of recent beyond-mean-field calculations.

Published
2020

16. Metastable States of ^{92,94}Se: Identification of an Oblate K Isomer of ^{94}Se and the Ground-State Shape Transition between N=58 and 60

Author

Lizarazo, C., Söderström, P.A., Werner, V., Pietralla, N., Walker, P.M., Dong, G.X., Xu, F.R., Rodríguez, T.R., Browne, F., Doornenbal, P., Nishimura, S., Nita, C.R., Obertelli, A., Ando, T., Arici, T., Authelet, G., Baba, H., Blazhev, A., Bruce, A.M., Calvet, D., Caroll, R.J., Château, F., Chen, S., Chung, L.X., Corsi, A., Cortés, M.L., Delbart, A., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gerl, J., Gheller, J.M., Giganon, A., Gillibert, A., Górska, M., Gottardo, A., Kojouharov, I., Kurz, N., Lapoux, V., Lee, J., Lettmann, M., Linh, B.D., Liu, J.J., Liu, Z., Momiyama, S., Moschner, K., Motobayashi, T., Nagamine, S., Vaquero, Victor, RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Federal Ministry of Education and Research (Germany), European Research Council, Ministerio de Educación y Ciencia (España), National Natural Science Foundation of China, and Science and Technology Facilities Council (UK)

Abstract

6 pags., 4 figs., Here we present new information on the shape evolution of the very neutron-rich ^{92,94}Se nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed γ rays emitted following the decay of their isomers. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasineutron states with an oblate deformation of β∼0.25, with the high-K state in ^{94}Se being metastable and K hindered. Following this, ^{94}Se is the lowest-mass neutron-rich nucleus known to date with such a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. This opens up the possibility for a new region of K isomers at low Z and at oblate deformation, involving the same neutron orbitals as the prolate orbitals within the classic Z∼72 deformed hafnium region. From an interpretation of the level scheme guided by theoretical calculations, an oblate deformation is also suggested for the ^{94}Se_{60} ground-state band., This work was carried out at the RIBF operated by RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. The authors thank the RIBF and BigRIPS teams for providing a stable high-intensity uranium beam and operating the secondary beams. We acknowledge support from the German BMBF Grants No. 05P15RDFN1, No. 05P19RDFN1, No. 05P15PKFNA, and No. 05P19PKFNA, the ERC Grant No. MINOS-258567, the Spanish MEC under Contracts No. FPA2014-57196-C5-4-P and No. FIS2014-53434, the National Key R&D Program of China (Contract No. 2018YFA0404402), the National Natural Science Foundation of China (Grants No. 11961141004, No. 11735017, No. 11675225, No. 11635003), the Vietnam MOST via the Physics Development Program Grant No. ĐTĐLCN.25/18, as well as from the Science and Technology Facilities Council (STFC). We further thank GSI for providing computing facilities.

Published
2020

17. Metastable States of $^{92,94}\mathrm{Se}$: Identification of an Oblate $K$ Isomer of $^{94}\mathrm{Se}$ and the Ground-State Shape Transition between $N=58\text{ }\text{and}\text{ }60$

Author

Lizarazo, C., Söderström, P.A., Werner, V., Pietralla, N., Walker, P.M., Dong, G.X., Xu, F.R., Rodríguez, T.R., Browne, F., Doornenbal, P., Nishimura, S., Niţă, C.R., Obertelli, A., Ando, T., Arici, T., Authelet, G., Baba, H., Blazhev, A., Bruce, A.M., Calvet, D., Caroll, R.J., Château, F., Chen, S., Chung, L.X., Corsi, A., Cortés, M.L., Delbart, A., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gerl, J., Gheller, J.M., Giganon, A., Gillibert, A., Górska, M., Gottardo, A., Kojouharov, I., Kurz, N., Lapoux, V., Lee, J., Lettmann, M., Linh, B.D., Liu, J.J., Liu, Z., Momiyama, S., Moschner, K., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Nobs, C., Olivier, L., Patel, Z., Paul, N., Podolyák, Zs., Roussé, J.Y., Rudigier, M., Saito, T.Y., Sakurai, H., Santamaria, C., Schaffner, H., Shand, C., Stefan, I., Steppenbeck, D., Taniuchi, R., Uesaka, T., Vaquero, V., Wimmer, K., Xu, Z., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics::Atomic and Molecular Clusters, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

International audience; Here we present new information on the shape evolution of the very neutron-rich Se92,94 nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed γ rays emitted following the decay of their isomers. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasineutron states with an oblate deformation of β∼0.25, with the high-K state in Se94 being metastable and K hindered. Following this, Se94 is the lowest-mass neutron-rich nucleus known to date with such a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. This opens up the possibility for a new region of K isomers at low Z and at oblate deformation, involving the same neutron orbitals as the prolate orbitals within the classic Z∼72 deformed hafnium region. From an interpretation of the level scheme guided by theoretical calculations, an oblate deformation is also suggested for the Se6094 ground-state band.

Published
2020

18. Sequential Nature of $(p,3p)$ Two-Proton Knockout from Neutron-Rich Nuclei

Author

Frotscher, A., Gómez-Ramos, M., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Paul, N., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J.Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Shimizu, N., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A.M., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Dombradi, Zs., Flavigny, F., Franchoo, S., Giacoppo, F., Górska, M., Gottardo, A., Hadyńska-Klęk, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B.D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C.R., Olivier, L., Ota, S., Patel, Z., Podolyák, Zs., Rudigier, M., Sahin, E., Saito, T.Y., Shand, C., Söderström, P.A., Stefan, I.G., Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Vajta, Zs., Werner, V., Wimmer, K., Wu, J., Xu, Z., 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

Twenty-one two-proton knockout (p; 3p) cross sections from neutron-rich nuclei at ~ 250 MeV/nucleon were measured. For the first time, the angular distribution of the three emitted protons were measured in coincidence with the tracker and hydrogen target MINOS, demonstrating that the (p; 3p) kinematics is consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p; 3p) over (p; 2p) inclusive cross sections follow the trend of other many-proton (neutron) removal reactions, further reinforcing the sequential nature of (p; 3p) in neutron-rich nuclei.

Published
2020

19. Metastable States of Se-92,Se-94: Identification of an Oblate K Isomer of Se-94 and the Ground-State Shape Transition between N=58 and 60

Author

Lizarazo, C., Soederstroem, P-A, Werner, V, Pietralla, N., Walker, P. M., Dong, G. X., Xu, F. R., Rodriguez, T. R., Browne, F., Doornenbal, P., Nishimura, S., Nita, C. R., Obertelli, A., Ando, T., Arici, T., Authelet, G., Baba, H., Blazhev, A., Bruce, A. M., Calvet, D., Caroll, R. J., Chateau, F., Chen, S., Chung, L. X., Corsi, A., Cortes, M. L., Delbart, A., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gerl, J., Gheller, J-M, Giganon, A., Gillibert, A., Gorska, M., Gottardo, A., Kojouharov, I, Kurz, N., Lapoux, V, Lee, J., Lettmann, M., Linh, B. D., Liu, J. J., Liu, Z., Momiyama, S., Moschner, K., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Nobs, C., Olivier, L., Patel, Z., Paul, N., Podolyak, Zs, Rousse, J-Y, Rudigier, M., Saito, T. Y., Sakurai, H., Santamaria, C., Schaffner, H., Shand, C., Stefan, I, Steppenbeck, D., Taniuchi, R., Uesaka, T., Vaquero, V., Wimmer, K., Xu, Z., Lizarazo, C., Soederstroem, P-A, Werner, V, Pietralla, N., Walker, P. M., Dong, G. X., Xu, F. R., Rodriguez, T. R., Browne, F., Doornenbal, P., Nishimura, S., Nita, C. R., Obertelli, A., Ando, T., Arici, T., Authelet, G., Baba, H., Blazhev, A., Bruce, A. M., Calvet, D., Caroll, R. J., Chateau, F., Chen, S., Chung, L. X., Corsi, A., Cortes, M. L., Delbart, A., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gerl, J., Gheller, J-M, Giganon, A., Gillibert, A., Gorska, M., Gottardo, A., Kojouharov, I, Kurz, N., Lapoux, V, Lee, J., Lettmann, M., Linh, B. D., Liu, J. J., Liu, Z., Momiyama, S., Moschner, K., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Nobs, C., Olivier, L., Patel, Z., Paul, N., Podolyak, Zs, Rousse, J-Y, Rudigier, M., Saito, T. Y., Sakurai, H., Santamaria, C., Schaffner, H., Shand, C., Stefan, I, Steppenbeck, D., Taniuchi, R., Uesaka, T., Vaquero, V., Wimmer, K., and Xu, Z.

Abstract

Here we present new information on the shape evolution of the very neutron-rich Se-92,Se-94 nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed gamma rays emitted following the decay of their isomers. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasineutron states with an oblate deformation of beta similar to 0.25, with the high-K state in Se-94 being metastable and K hindered. Following this, Se-94 is the lowest-mass neutron-rich nucleus known to date with such a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. This opens up the possibility for a new region of K isomers at low Z and at oblate deformation, involving the same neutron orbitals as the prolate orbitals within the classic Z similar to 72 deformed hafnium region. From an interpretation of the level scheme guided by theoretical calculations, an oblate deformation is also suggested for the Se-94(60) ground-state band.

Published
2020

20. Sequential Nature of (p,3p) Two-Proton Knockout from Neutron-Rich Nuclei

Author

Frotscher, A., Gomez-Ramos, M., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Corsi, A., Delbart, A., Gheller, J-M, Giganon, A., Gillibert, A., Isobe, T., Lapoux, V, Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Paul, N., Peron, C., Peyaud, A., Pollacco, E. C., Rousse, J-Y, Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Shimizu, N., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A. M., Carroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Dombradi, Zs, Flavigny, F., Franchoo, S., Giacoppo, F., Groska, M., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C. R., Olivier, L., Ota, S., Patel, Z., Podolyak, Zs, Rudigier, M., Sahin, E., Saito, T. Y., Shand, C., Soderstrom, P-A, Stefan, I. G., Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Vajta, Zs, Werner, V, Wimmer, K., Wu, J., Xu, Z., Frotscher, A., Gomez-Ramos, M., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Corsi, A., Delbart, A., Gheller, J-M, Giganon, A., Gillibert, A., Isobe, T., Lapoux, V, Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Paul, N., Peron, C., Peyaud, A., Pollacco, E. C., Rousse, J-Y, Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Shimizu, N., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A. M., Carroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Dombradi, Zs, Flavigny, F., Franchoo, S., Giacoppo, F., Groska, M., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C. R., Olivier, L., Ota, S., Patel, Z., Podolyak, Zs, Rudigier, M., Sahin, E., Saito, T. Y., Shand, C., Soderstrom, P-A, Stefan, I. G., Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Vajta, Zs, Werner, V, Wimmer, K., Wu, J., and Xu, Z.

Abstract

Twenty-one two-proton knockout (p, 3p) cross sections were measured from neutron-rich nuclei at similar to 250 MeV/nucleon in inverse kinematics. The angular distribution of the three emitted protons was determined for the first time, demonstrating that the (p, 3p) kinematics are consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p, 3p) over (p, 2p) inclusive cross sections follow the trend of other many-nucleon removal reactions, further reinforcing the sequential nature of (p, 3p) in neutron-rich nuclei.

Published
2020

21. Shape Changes in the Mirror Nuclei Kr70 and Se70

Author

Wimmer, K., primary, Korten, W., additional, Doornenbal, P., additional, Arici, T., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Delaroche, J.-P., additional, Doherty, D. T., additional, Gerl, J., additional, Gernhäuser, R., additional, Girod, M., additional, Jenkins, D., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Obertelli, A., additional, Libert, J., additional, Lubos, D., additional, Rodríguez, T. R., additional, Rubio, B., additional, Sahin, E., additional, Saito, T. Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Wadsworth, R., additional, and Zielinska, M., additional

Published
2021
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23. Inclusive cross sections for one- and multi-nucleon removal from Sn, Sb, and Te projectiles beyond the N = 82 shell closure

Author

Vaquero, V., Jungclaus, A., Rodríguez-Sánchez, J.L., Tostevin, J.A., Doornenbal, P., Wimmer, K., Chen, S., Nácher, E., Sahin, E., Shiga, Y., Steppenbeck, D., Taniuchi, R., Xu, Z.Y., Ando, T., Baba, H., Bello Garrote, F.L., Franchoo, S., Gargano, A., Hadynska-Klek, K., Kusoglu, A., Liu, J., Lokotko, T., Momiyama, S., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Orlandi, R., Saito, T., Sakurai, H., Söderström, P.A., Tveten, G.M., Vajta, Zs., and Yalcinkaya, M.

Published
2019
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24. Sequential Nature of (p,3p) Two-Proton Knockout from Neutron-Rich Nuclei

Author

Frotscher, A., primary, Gómez-Ramos, M., additional, Obertelli, A., additional, Doornenbal, P., additional, Authelet, G., additional, Baba, H., additional, Calvet, D., additional, Château, F., additional, Chen, S., additional, Corsi, A., additional, Delbart, A., additional, Gheller, J.-M., additional, Giganon, A., additional, Gillibert, A., additional, Isobe, T., additional, Lapoux, V., additional, Matsushita, M., additional, Momiyama, S., additional, Motobayashi, T., additional, Niikura, M., additional, Otsu, H., additional, Paul, N., additional, Péron, C., additional, Peyaud, A., additional, Pollacco, E. C., additional, Roussé, J.-Y., additional, Sakurai, H., additional, Santamaria, C., additional, Sasano, M., additional, Shiga, Y., additional, Shimizu, N., additional, Steppenbeck, D., additional, Takeuchi, S., additional, Taniuchi, R., additional, Uesaka, T., additional, Wang, H., additional, Yoneda, K., additional, Ando, T., additional, Arici, T., additional, Blazhev, A., additional, Browne, F., additional, Bruce, A. M., additional, Carroll, R., additional, Chung, L. X., additional, Cortés, M. L., additional, Dewald, M., additional, Ding, B., additional, Dombradi, Zs., additional, Flavigny, F., additional, Franchoo, S., additional, Giacoppo, F., additional, Górska, M., additional, Gottardo, A., additional, Hadyńska-Klęk, K., additional, Korkulu, Z., additional, Koyama, S., additional, Kubota, Y., additional, Jungclaus, A., additional, Lee, J., additional, Lettmann, M., additional, Linh, B. D., additional, Liu, J., additional, Liu, Z., additional, Lizarazo, C., additional, Louchart, C., additional, Lozeva, R., additional, Matsui, K., additional, Miyazaki, T., additional, Moschner, K., additional, Nagamine, S., additional, Nakatsuka, N., additional, Nita, C., additional, Nishimura, S., additional, Nobs, C. R., additional, Olivier, L., additional, Ota, S., additional, Patel, Z., additional, Podolyák, Zs., additional, Rudigier, M., additional, Sahin, E., additional, Saito, T. Y., additional, Shand, C., additional, Söderström, P.-A., additional, Stefan, I. G., additional, Sumikama, T., additional, Suzuki, D., additional, Orlandi, R., additional, Vaquero, V., additional, Vajta, Zs., additional, Werner, V., additional, Wimmer, K., additional, Wu, J., additional, and Xu, Z., additional

Published
2020
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25. Metastable States of Se92,94 : Identification of an Oblate K Isomer of Se94 and the Ground-State Shape Transition between N=58 and 60

Author

Lizarazo, C., primary, Söderström, P.-A., additional, Werner, V., additional, Pietralla, N., additional, Walker, P. M., additional, Dong, G. X., additional, Xu, F. R., additional, Rodríguez, T. R., additional, Browne, F., additional, Doornenbal, P., additional, Nishimura, S., additional, Niţă, C. R., additional, Obertelli, A., additional, Ando, T., additional, Arici, T., additional, Authelet, G., additional, Baba, H., additional, Blazhev, A., additional, Bruce, A. M., additional, Calvet, D., additional, Caroll, R. J., additional, Château, F., additional, Chen, S., additional, Chung, L. X., additional, Corsi, A., additional, Cortés, M. L., additional, Delbart, A., additional, Dewald, M., additional, Ding, B., additional, Flavigny, F., additional, Franchoo, S., additional, Gerl, J., additional, Gheller, J.-M., additional, Giganon, A., additional, Gillibert, A., additional, Górska, M., additional, Gottardo, A., additional, Kojouharov, I., additional, Kurz, N., additional, Lapoux, V., additional, Lee, J., additional, Lettmann, M., additional, Linh, B. D., additional, Liu, J. J., additional, Liu, Z., additional, Momiyama, S., additional, Moschner, K., additional, Motobayashi, T., additional, Nagamine, S., additional, Nakatsuka, N., additional, Niikura, M., additional, Nobs, C., additional, Olivier, L., additional, Patel, Z., additional, Paul, N., additional, Podolyák, Zs., additional, Roussé, J.-Y., additional, Rudigier, M., additional, Saito, T. Y., additional, Sakurai, H., additional, Santamaria, C., additional, Schaffner, H., additional, Shand, C., additional, Stefan, I., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Uesaka, T., additional, Vaquero, V., additional, Wimmer, K., additional, and Xu, Z., additional

Published
2020
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26. Shape coexistence revealed in the $$N=Z$$ isotope $$^{72}$$Kr through inelastic scattering

Author

Wimmer, K., primary, Arici, T., additional, Korten, W., additional, Doornenbal, P., additional, Delaroche, J.-P., additional, Girod, M., additional, Libert, J., additional, Rodríguez, T. R., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Doherty, D. T., additional, Gerl, J., additional, Gernhäuser, R., additional, Goigoux, T., additional, Jenkins, D., additional, Kiss, G., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Nishimura, S., additional, Obertelli, A., additional, Lubos, D., additional, Phong, V. H., additional, Rubio, B., additional, Sahin, E., additional, Saito, T. Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Vaquero, V., additional, Wadsworth, R., additional, Wu, J., additional, and Zielinska, M., additional

Published
2020
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27. Discovery of Br in secondary reactions of radioactive beams

Author

Wimmer, K., Doornenbal, P., Korten, W., Aguilera, P., Algora, A., Ando, T., Arici, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D.T., Gerl, J., Gernhäuser, R., Jenkins, D.G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

The proton-rich isotope $^{68}$Br was discovered in secondary fragmentation reactions of fast radioactive beams. Proton-rich secondary beams of $^{70,71,72}$Kr and $^{70}$Br, produced at the RIKEN Nishina Center and identified by the BigRIPS fragment separator, impinged on a secondary $^{9}$Be target. Unambiguous particle identification behind the secondary target was achieved with the ZeroDegree spectrometer. Based on the expected direct production cross sections from neighboring isotopes, the lifetime of the ground or long-lived isomeric state of $^{68}$Br was estimated. The results suggest that secondary fragmentation reactions, where relatively few nucleons are removed from the projectile, offer an alternative way to search for new isotopes, as these reactions populate preferentially low-lying states.

Published
2019

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

Author

Paul, N., Obertelli, A., Bertulani, C, Corsi, A., Doornenbal, P., Rodriguez-Sanchez, J. L., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Delbart, A., Gheller, J.-M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Peron, C., Peyaud, A., Pollacco, E., Rousse, J.-Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A., Carroll, R., Chung, L. X., Cortés, M., Dewald, M., Ding, B., Dombradi, Zs, Flavigny, F., Franchoo, S., Giacoppo, F., Górska, M., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B, Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, Radomira, Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C., Olivier, L., Ota, S., Patel, Z., Podolyák, Zs, Rudigier, M., Sahin, E., Saito, T., Shand, C., Söderström, P.-A, Stefan, I, Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Werner, V., Wimmer, K., Wu, J., Xu, Z., Dombradi, Zs., Podolyak, Zs., Stefan, G., Vajta, Zs., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Technische Universität Darmstadt (TU Darmstadt), Texas A&M University–Commerce, Helmholtz Centre for Heavy Ion Research (GSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre for Nuclear Study, University of Tokyo (CNS), The University of Tokyo (UTokyo), Department of Applied Physics, The University of Tokyo, Département d'Ingénierie des Systèmes (ex SIS) (DIS), Rikkyo University [Tokyo], Universität zu Köln, School of Computing, Engineering and Mathematics (Brighton), University of Brighton, University of Surrey (UNIS), Institute for Nuclear Science and Technique, VINATOM, Institut für Kernphysik der Universität zu Köln, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China (IMP), Institute for Nuclear Research [Budapest] (ATOMKI), Hungarian Academy of Sciences (MTA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), University of Oslo (UiO), Spanish National Research Council [Madrid] (CSIC), City University of Hong Kong [Hong Kong] (CUHK), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kyoto University [Kyoto], IFIN-HH, Oslo University Hospital [Oslo], Tohoku University [Sendai], Japan Atomic Energy Agency [Ibaraki] (JAEA), Department of Physics, University of Tokyo, Bunkyo, Tokyo, European Project: 258567,EC:FP7:ERC,ERC-2010-StG_20091028,MINOS(2010), Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt), Universität zu Köln = University of Cologne, and Kyoto University

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

International audience; Fifty-five inclusive single nucleon-removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at $\sim$250 MeV=nucleon are measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons as compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting, contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semimicroscopic model predictions, highlighting the enhanced role of lowlying level densities in nucleon-removal cross sections from loosely bound nuclei

Published
2019

29. In-beam γ-ray spectroscopy of Te 136 at relativistic energies

Author

Vaquero, V., Jungclaus, A., Doornenbal, P., Wimmer, K., Moro, A. M., Ogata, K., Furumoto, T., Chen, S., Nácher, E., Sahin, E., Shiga, Y., Steppenbeck, D., Taniuchi, R., Xu, Z. Y., Ando, T., Baba, H., Bello Garrote, F. L., Franchoo, S., Hadynska-Klek, K., Kusoglu, A., Liu, J., Lokotko, T., Momiyama, S., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Orlandi, R., Saito, T. Y., Sakurai, H., Söderström, P. A., Tveten, G. M., Vajta, Zs, and Yalcinkaya, M.

Subjects
Nuclear Experiment
Abstract

The reduced transition probability B(E2;01+→21+) to the first excited 2+ state of the neutron-rich nucleus Te136, with two protons and two neutrons outside the doubly magic Sn132 core, was measured via Coulomb excitation at relativistic energies at the RIKEN Radioactive Isotope Beam Factory. A value of B(E2)=0.191(26) e2b2 was extracted from the measured inelastic scattering cross section on an Au target taking into account the contributions from both Coulomb and nuclear excitations. In addition, an upper limit for the transition strength to a 2+ state of mixed-symmetry character in the excitation energy range of 1.5-2.2 MeV was determined and compared to the predictions of various theoretical calculations. Because of the high statistics gathered in the present experiment the error of the deduced B(E2) value is dominated by the systematic uncertainties involved in the analysis of Coulomb excitation experiments at beam energies around 150 MeV/u. Therefore, the latter are for the first time assessed in detail in the present work.

Published
2019

30. Isotopic production cross sections of residual nuclei in proton-and deuteron-induced reactions on $^{91,92}$Y,$^{92,93}$Zr,and$^{93,94}$Nb around 100 MeV/nucleon

Author

Watanabe, Yu, Suwa, J, Nakano, K, Kawase, S, Wang, H, Otsu, H, Sakurai, H, Ahn, D S, Aikawa, M, Ando, T, Araki, S, Chen, S, Chiga, N, Doornenbal, P, Fukuda, N, Isobe, T, Kawakami, S, Kin, T, Kondo, Y, Koyama, S, Kubono, S, Maeda, Y, Makinaga, A, Matsushita, M, Matsuzaki, T, Michimasa, S, Momiyama, S, Nagamine, S, Nakamura, T, Niikura, M, Ozaki, T, Saito, A, Saito, T, Shiga, Y, Shikata, M, Shimizu, Y, Shimoura, S, Sumikama, T, Soderstrom, P A, Suzuki, H, Takeda, H, Takeuchi, S, Taniuchi, R, Togano, Y, Tsubota, J, Uesaka, M, Watanabe, Ya, Wimmer, K, Yamamoto, T, and Yoshida, K

Subjects
Nuclear Physics - Experiment
Abstract

Production cross sections of residual nuclei via proton-and deuteron-induced spallation reactions on 91,92 Y, 92,93 Zr, and 93,94 Nb at projectile energies Production cross sections of residual nuclei via proton-and deuteron-induced spallation reactions on $^{91,92}$Y,$^{92,93}$Zr,and $^{93,94}$Nb at projectile energies around 100 MeV/nucleon were measured in inverse kinematics at the RIKEN Radioactive Isotope Beam Factory. Noticeable jumps in the measured cross sections of isotone production appear between the neutron numbers N =51 and 50 for target nuclei with the initial neutron number N$_{init}$ =53 ($^{92}$Y, $^{93}$Zr, and $^{94}$Nb), while such jump is not clearly seen for target nuclei with N$^{init}$=52($^{91}$Y,$^{92}$Zr, and $^{93}$Nb). The measured isotopic production cross sections are compared with PHITS calculations considering both the intranuclear cascade and evaporation processes in order to benchmark the reaction models.

Published
2019

31. In-beam γ -ray spectroscopy of Te 136 at relativistic energies

Author

Vaquero, Victor, Jungclaus, Andrea, Doornenbal, P., Wimmer, K., Moro, A.M., Ogata, K., Furumoto, T., Chen, S., Nácher, Enrique, Sahin, E., Shiga, Y., Steppenbeck, D., Taniuchi, R., Xu, Z. Y., Ando, T., Baba, H., Bello Garrote, F.L., Franchoo, S., Hadynska-Klek, K., Kusoglu, A., Liu, J., Lokotko, T., Momiyama, S., Motobayashi, T., Nagamine, S., Nakatsuka, Nathan, Niikura, M., Orlandi, R., Saito, T. Y., Sakurai, H., Söderström, P. A., Tveten, G. M., Vajta, Z., Yalcinkaya, M., RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Abstract

14 pags., 11 figs-. 3 tabs., The reduced transition probability B(E2;01+→21+) to the first excited 2+ state of the neutron-rich nucleus Te136, with two protons and two neutrons outside the doubly magic Sn132 core, was measured via Coulomb excitation at relativistic energies at the RIKEN Radioactive Isotope Beam Factory. A value of B(E2)=0.191(26) e2b2 was extracted from the measured inelastic scattering cross section on an Au target taking into account the contributions from both Coulomb and nuclear excitations. In addition, an upper limit for the transition strength to a 2+ state of mixed-symmetry character in the excitation energy range of 1.5-2.2 MeV was determined and compared to the predictions of various theoretical calculations. Because of the high statistics gathered in the present experiment the error of the deduced B(E2) value is dominated by the systematic uncertainties involved in the analysis of Coulomb excitation experiments at beam energies around 150 MeV/u. Therefore, the latter are for the first time assessed in detail in the present work., We thank Dirk Weisshaar for valuable discussions and the staff of the RIKEN Nishina Center accelerator complex for providing high-intensity beams to the experiment. This work was supported by the Spanish Ministerio de Economía y Competitividad under Contracts No. FPA2014-57196-C5-4-P, No. FPA2017-84756-C4-2-P, and No. FIS2014-53448-C2-1-P.

Published
2019

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

Author

Paul, N., Obertelli, A., Bertulani, C. A., Corsi, A., Doornenbal, P., Rodriguez-Sanchez, J. L., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Peron, C., Peyaud, A., Pollacco, E. C., Rousse, J. -Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A. M., Carroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Dombradi, Zs., Flavigny, F., Franchoo, S., Giacoppo, F., Gorska, M., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C. R., Olivier, L., Ota, S., Patel, Z., Podolyak, Zs., Rudigier, M., Sahin, E., Saito, T. Y., Shand, C., Soderstrom, P. -A., Stefan, I. G., Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Vajta, Zs., Werner, V., Wimmer, K., Wu, J., Xu, Z., Paul, N., Obertelli, A., Bertulani, C. A., Corsi, A., Doornenbal, P., Rodriguez-Sanchez, J. L., Authelet, G., Baba, H., Calvet, D., Chateau, F., Chen, S., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Peron, C., Peyaud, A., Pollacco, E. C., Rousse, J. -Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A. M., Carroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Dombradi, Zs., Flavigny, F., Franchoo, S., Giacoppo, F., Gorska, M., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C. R., Olivier, L., Ota, S., Patel, Z., Podolyak, Zs., Rudigier, M., Sahin, E., Saito, T. Y., Shand, C., Soderstrom, P. -A., Stefan, I. G., Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Vajta, Zs., Werner, V., Wimmer, K., Wu, J., and Xu, Z.

Abstract

Fifty-five inclusive single nucleon-removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at similar to 250 MeV/nucleon are measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons as compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting, contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semimicroscopic model predictions, highlighting the enhanced role of low-lying level densities in nucleon-removal cross sections from loosely bound nuclei.

Published
2019

34. Inclusive cross sections for one- and multi-nucleon removal from Sn, Sb, and Te projectiles beyond the N = 82 shell closure

Author

RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Science and Technology Facilities Council (UK), Japan Society for the Promotion of Science, Research Council of Norway, SCOAP, Vaquero, Victor, Jungclaus, Andrea, Rodríguez-Sánchez, J.L., Tostevin, J.A., Doornenbal, P., Wimmer, K., Chen, S., Nácher, Enrique, Sahin, E., Shiga, Y., Steppenbeck, D., Taniuchi, R., Xu, Z. Y., Ando, T., Baba, H., Bello Garrote, F. L., Franchoo, S., Gargano, A., Hadynska-Klek, K., Kusoglu, A., Liu, J., Lokotko, T., Momiyama, S., Motobayashi, T., Nagamine, S., Nakatsuka, Nathan, Niikura, M., Orlandi, R., Saito, T., Sakurai, H., Söderström, P.A., Tveten, G.M., Vajta, Z., Yalcinkaya, M., RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Science and Technology Facilities Council (UK), Japan Society for the Promotion of Science, Research Council of Norway, SCOAP, Vaquero, Victor, Jungclaus, Andrea, Rodríguez-Sánchez, J.L., Tostevin, J.A., Doornenbal, P., Wimmer, K., Chen, S., Nácher, Enrique, Sahin, E., Shiga, Y., Steppenbeck, D., Taniuchi, R., Xu, Z. Y., Ando, T., Baba, H., Bello Garrote, F. L., Franchoo, S., Gargano, A., Hadynska-Klek, K., Kusoglu, A., Liu, J., Lokotko, T., Momiyama, S., Motobayashi, T., Nagamine, S., Nakatsuka, Nathan, Niikura, M., Orlandi, R., Saito, T., Sakurai, H., Söderström, P.A., Tveten, G.M., Vajta, Z., and Yalcinkaya, M.

Abstract

Inclusive one- and multi-nucleon removal cross sections have been measured for several Sn, Sb and Te isotopes just beyond the N=82 neutron shell closure. The beams were produced in the projectile fission of a U beam at the Radioactive Isotope Beam Factory at RIKEN. The experimental cross sections are compared to predictions from the most recent version of the Liege intranuclear cascade model. Although the overall agreement is good, severe discrepancies are observed for the cases of one- and two-neutron removal from Sn and Sb projectiles and one-proton knockout from all measured N=84 isotones. These discrepancies, as well as the relevance of quasi-elastic reaction channels to the one-neutron removal cross sections, are discussed. In addition, the measured inclusive one-proton knockout cross section for the semi-magic Sn projectile is compared to eikonal direct reaction theory calculations to assess if the suppression factors to these calculated cross sections, deduced from data on reactions of lighter projectile nuclei, are also applicable to heavy nuclei.

Published
2019

35. Discovery of 68Br in secondary reactions of radioactive beams

Author

Ministerio de Economía y Competitividad (España), Wimmer, K., Doornenbal, P., Korten, W., Aguilera, P., Algora, Alejandro, Ando, T., Arici, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Doherty, D.T., Gerl, J., Gernhäuser, R., Jenkins, D.G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, Berta, Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., Zielinska, M., Ministerio de Economía y Competitividad (España), Wimmer, K., Doornenbal, P., Korten, W., Aguilera, P., Algora, Alejandro, Ando, T., Arici, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Doherty, D.T., Gerl, J., Gernhäuser, R., Jenkins, D.G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, Berta, Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

The proton-rich isotope Br was discovered in secondary fragmentation reactions of fast radioactive beams. Proton-rich secondary beams of Kr and Br, produced at the RIKEN Nishina Center and identified by the BigRIPS fragment separator, impinged on a secondary Be target. Unambiguous particle identification behind the secondary target was achieved with the ZeroDegree spectrometer. Based on the expected direct production cross sections from neighboring isotopes, the lifetime of the ground or long-lived isomeric state of Br was estimated. The results suggest that secondary fragmentation reactions, where relatively few nucleons are removed from the projectile, offer an alternative way to search for new isotopes, as these reactions populate preferentially low-lying states.

Published
2019

38. Shape coexistence and isospin symmetry in = 70 nuclei: Spectroscopy of the = −1 Nucleus Kr

Author

Wimmer, K., Korten, W., Arici, T., Doornenbal, P., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D.T., Gerl, J., Gernhäuser, R., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

Excited states in the Tz=−1 nucleus $^{70}$Kr have been populated using inelastic scattering of a radioactive $^{70}$Kr beam as well as one- and two-neutron removal reactions from $^{71,72}$Kr at intermediate beam energies. The level scheme of $^{70}$Kr was constructed from the observed γ-ray transitions and coincidences. Tentative spin and parity assignments were made based on comparison with the mirror nucleus $^{70}$Se. A second 2+ state and a candidate for the corresponding 42+ state suggest shape coexistence in $^{70}$Kr.

Published
2018

39. Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the T = −1 nucleus 70Kr

Author

Wimmer, K., Korten, W., Arici, T., Doornenbal, P., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Doherty, D. T., Gerl, J., Gernhäuser, R., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

Physics letters / B B 785, 441 - 446 (2018). doi:10.1016/j.physletb.2018.07.067, Published by North-Holland Publ., Amsterdam

Published
2018
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40. Discovery of 68Br in secondary reactions of radioactive beams

Author

Wimmer, K., primary, Doornenbal, P., additional, Korten, W., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Arici, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Doherty, D.T., additional, Gerl, J., additional, Gernhäuser, R., additional, Jenkins, D.G., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Obertelli, A., additional, Lubos, D., additional, Rubio, B., additional, Sahin, E., additional, Saito, T.Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Wadsworth, R., additional, and Zielinska, M., additional

Published
2019
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41. Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

Author

Paul, N., primary, Obertelli, A., additional, Bertulani, C. A., additional, Corsi, A., additional, Doornenbal, P., additional, Rodriguez-Sanchez, J. L., additional, Authelet, G., additional, Baba, H., additional, Calvet, D., additional, Château, F., additional, Chen, S., additional, Delbart, A., additional, Gheller, J.-M., additional, Giganon, A., additional, Gillibert, A., additional, Isobe, T., additional, Lapoux, V., additional, Matsushita, M., additional, Momiyama, S., additional, Motobayashi, T., additional, Niikura, M., additional, Otsu, H., additional, Péron, C., additional, Peyaud, A., additional, Pollacco, E. C., additional, Roussé, J.-Y., additional, Sakurai, H., additional, Santamaria, C., additional, Sasano, M., additional, Shiga, Y., additional, Steppenbeck, D., additional, Takeuchi, S., additional, Taniuchi, R., additional, Uesaka, T., additional, Wang, H., additional, Yoneda, K., additional, Ando, T., additional, Arici, T., additional, Blazhev, A., additional, Browne, F., additional, Bruce, A. M., additional, Carroll, R., additional, Chung, L. X., additional, Cortés, M. L., additional, Dewald, M., additional, Ding, B., additional, Dombradi, Zs., additional, Flavigny, F., additional, Franchoo, S., additional, Giacoppo, F., additional, Górska, M., additional, Gottardo, A., additional, Hadynska-Klek, K., additional, Korkulu, Z., additional, Koyama, S., additional, Kubota, Y., additional, Jungclaus, A., additional, Lee, J., additional, Lettmann, M., additional, Linh, B. D., additional, Liu, J., additional, Liu, Z., additional, Lizarazo, C., additional, Louchart, C., additional, Lozeva, R., additional, Matsui, K., additional, Miyazaki, T., additional, Moschner, K., additional, Nagamine, S., additional, Nakatsuka, N., additional, Nita, C., additional, Nishimura, S., additional, Nobs, C. R., additional, Olivier, L., additional, Ota, S., additional, Patel, Z., additional, Podolyák, Zs., additional, Rudigier, M., additional, Sahin, E., additional, Saito, T. Y., additional, Shand, C., additional, Söderström, P.-A., additional, Stefan, I. G., additional, Sumikama, T., additional, Suzuki, D., additional, Orlandi, R., additional, Vaquero, V., additional, Vajta, Zs., additional, Werner, V., additional, Wimmer, K., additional, Wu, J., additional, and Xu, Z., additional

Published
2019
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42. In-beam γ -ray spectroscopy of Te136 at relativistic energies

Author

Vaquero, V., primary, Jungclaus, A., additional, Doornenbal, P., additional, Wimmer, K., additional, Moro, A. M., additional, Ogata, K., additional, Furumoto, T., additional, Chen, S., additional, Nácher, E., additional, Sahin, E., additional, Shiga, Y., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Xu, Z. Y., additional, Ando, T., additional, Baba, H., additional, Bello Garrote, F. L., additional, Franchoo, S., additional, Hadynska-Klek, K., additional, Kusoglu, A., additional, Liu, J., additional, Lokotko, T., additional, Momiyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Nakatsuka, N., additional, Niikura, M., additional, Orlandi, R., additional, Saito, T. Y., additional, Sakurai, H., additional, Söderström, P. A., additional, Tveten, G. M., additional, Vajta, Zs., additional, and Yalcinkaya, M., additional

Published
2019
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43. Signatures of triaxiality in low-spin spectra of Ge-86

Author

Federal Ministry of Education and Research (Germany), SCOAP, European Commission, Ministerio de Economía y Competitividad (España), Vietnam Academy of Science and Technology, Science and Technology Facilities Council (UK), Lettmann, M., Werner, V., Pietralla, N., Doornenbal, P., Obertelli, A., Rodríguez, T. R., Sieja, K., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J. M., Giganon, A., Gillibert, A., Lapoux, V., Motobayashi, T., Niikura, M., Paul, N., Roussé, J. Y., Sakurai, H., Santamaria, C., Teppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A., Caroll, R. J., Chung, L. X., Cortés, M. L., Dewald, M. Ding, B., Flavigny, F., Franchoo, S., Górska, M., Gottardo, A., Jungclaus, Andrea, Lee, H. C. J., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Moschner, K., Nagamine, S. Nakatsuka, N., Nita, C., Nobs, C. R., Olivier, L., Patel, Z., Podolyák, Z., Rudigier, M., Saito, T., Shand, C., Söderström, P. A., Stefan, I., Vaquero, Victor, Wimmer, K., Xu, Z., Federal Ministry of Education and Research (Germany), SCOAP, European Commission, Ministerio de Economía y Competitividad (España), Vietnam Academy of Science and Technology, Science and Technology Facilities Council (UK), Lettmann, M., Werner, V., Pietralla, N., Doornenbal, P., Obertelli, A., Rodríguez, T. R., Sieja, K., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J. M., Giganon, A., Gillibert, A., Lapoux, V., Motobayashi, T., Niikura, M., Paul, N., Roussé, J. Y., Sakurai, H., Santamaria, C., Teppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A., Caroll, R. J., Chung, L. X., Cortés, M. L., Dewald, M. Ding, B., Flavigny, F., Franchoo, S., Górska, M., Gottardo, A., Jungclaus, Andrea, Lee, H. C. J., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Moschner, K., Nagamine, S. Nakatsuka, N., Nita, C., Nobs, C. R., Olivier, L., Patel, Z., Podolyák, Z., Rudigier, M., Saito, T., Shand, C., Söderström, P. A., Stefan, I., Vaquero, Victor, Wimmer, K., and Xu, Z.

Abstract

Low-spin states of neutron-rich Ge-84,Ge-86,Ge-88 were measured by in-flight gamma-ray spectroscopy at 270 MeV/u at the RIKEN-RIBF facility. The exotic beams have been produced by primary U-238 in-flight fission reactions and impinged on the MINOS device. MINOS combines a 10-cm long LH2 target with a Time Projection Chamber (TPC) to reconstruct the reaction vertices. The reactions were selected by the BigRIPS and the ZeroDegree spectrometers for the incoming and outgoing channels, respectively. Emitted gamma radiation was detected by the NaI-array DALI2. De-excitations from the 6(1)(+), 4(1,2)(+), and 2(1,2)(+) states of Ge-84,Ge- 86 and 4(1)(+) and 26 states of Ge-88 were observed. The data are compared to state-of-the-art shell model and beyond-mean-field calculations. Furthermore, a candidate for a 3(1)(+) state of Ge-86 was identified. This state plays a key role in the discussion of ground-state triaxiality of Ge-86, along with other features of the low-energy level scheme.

Published
2018

44. First Indication for Shape Transitions in Neutron-rich Selenium Isotopes

Author

Chen, S, Doornenbal, P, Obertelli, A, Rodrıguez, TR, Authelet, G, Baba, H, Calvet, D, Chateau, F, Corsi, A, Delbart, A, Gheller, J-M, Giganon, A, Gillibert, A, Lapoux, V, Motobayashi, T, Niikura, M, Paul, N, Rousse, J-Y, Sakurai, H, Santamaria, C, Steppenbeck, D, Taniuchi, R, Uesaka, T, Ando, T, Arici, T, Blazhev, A, Browne, F, Bruce, AM, Caroll, R, Chung, LX, Cortes, ML, Dewald, M, Ding, B, Flavigny, F, Franchoo, S, Gorska, M, Gottardo, A, Jungclaus, A, Lee, J, Lettmann, M, Linh, BD, Liu, J, Liu, Z, Lizarazo, C, Momiyama, S, Moschner, K, Nagamine, S, Nakatsuka, N, Nita, CR, Nobs, C, Olivier, L, Orlandi, R, Patel, Z, Podolyak, Zsolt, Rudigier, Matthias, Saito, T, Shand, Callum, Soderstrom, PA, Stefan, I, Vaquero, V, Werner, V, Wimmer, K, and Xu, Z

Abstract

Neutron-rich 88,90,92,94Se isotopes were studied via in-beam γ-ray spectroscopy after production from nucleon removal at intermediate energies at the Radioactive Isotope Beam Factory. γ-γ coincidence analysis allowed to establish level schemes for the first time in these nuclei, including the 2+ 1 → 0 + gs, 4+ 1 → 2 + 1 transitions and their energy ratio R4/2. Low-lying 2+ 2 levels and their branching to the 2+ 1 and 0+ gs states were observed. The experimental results are in good agreement with self-consistent beyond-mean-field calculations based on the Gogny D1S interaction, suggesting ground state shape transition from oblate to prolate then back to oblate between N = 52 − 60 and indicating shape coexistence.

Published
2017

45. Shape Evolution in Neutron-rich Krypton Isotopes beyond N = 60 : First spectroscopy of 98;100Kr

Author

Flavigny, F, Doornenbal, P, Obertelli, A, Delaroche, J-P, Girod, M, Libert, J, Rodriguez, TR, Authelet, G, Baba, H, Calvet, D, Chateau, F, Chen, S, Corsi, A, Delbart, A, Gheller, J-M, Giganon, A, Gillibert, A, Lapoux, V, Motobayashi, T, Niikura, M, Paul, N, Rousse, J-Y, Sakura, H, Santamaria, C, Steppenbeck, D, Taniuchi, R, Uesaka, T, Ando, T, Arici, T, Blazhev, A, Browne, F, Bruce, A, Carroll, R, Chung, LX, Cortes, ML, Dewald, M, Ding, B, Franchoo, S, Gorska, M, Gottardo, A, Jungclaus, A, Lee, J, Lettmann, M, Linh, BD, Liu, J, Liu, Z, Lizarazo, C, Momiyama, S, Moschner, K, Nagamine, S, Nakatsuka, N, Nita, C, Nobs, CR, Olivier, L, Orlandi, R, Patel, Z, Podolyak, Zsolt, Rudigier, M, Saito, T, Shand, C, Soderstrom, PA, Stefan, I, Vaquero, V, Werner, V, Wimmer, K, and Xu, Z

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We report on the first γ-ray spectroscopy of low-lying states in neutron-rich 98,100Kr isotopes obtained from 99,101Rb(p,2p) reactions at ∼ 220 MeV/nucleon. A reduction of the 2+ 1 state energies beyond N = 60 demonstrates a significant increase of deformation, shifted in neutron number compared to the sharper transition observed in strontium and zirconium isotopes. State-of-theart beyond-mean-field calculations using the Gogny D1S interaction predict level energies in good agreement with experimental results. The identification of a low-lying (0+ 2 , 2+ 2 ) state in 98Kr provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblate-prolate shape coexistence picture suggested by theory

Published
2017

46. Gamma Decay of Unbound Neutron-Hole States in Sn-133

Author

Vaquero, V, Jungclaus, A, Doornenbal, P, Wimmer, K, Gargano, A, Tostevin, JA, Chen, S, Nacher, E, Sahin, Eda, Shiga, Y, Steppenbeck, D, Taniuchi, R, Xu, ZY, Ando, T, Baba, H, Bello Garrote, Frank Leonel, Franchoo, S, Hadynska-Klek, Katarzyna, Kusoglu, A, Liu, J, Lokotko, T, Momiyama, S, Motobayashi, T, Nagamine, S, Nakatsuka, N, Niikura, M, Orlandi, R, Saito, T, Sakurai, H, Soderstrom, PA, Tveten, Gry Merete, Vajta, Zs, and Yalcinkaya, M

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear Experiment
Abstract

Excited states in the nucleus 133Sn, with one neutron outside the doubly-magic 132Sn core, were populated following one-neutron knockout from a 134Sn beam on a carbon target at relativistic energies at the Radioactive Isotope Beam Factory at RIKEN. Besides the γ rays emitted in the decay of the known neutron single-particle states in 133Sn additional γ strength in the energy range 3.5-5.5 MeV was observed for the first time. Since the neutron-separation energy of 133Sn is low, Sn=2.402(4) MeV, this observation provides direct evidence for the radiative decay of neutronunbound states in this nucleus. The ability of electromagnetic decay to compete successfully with neutron emission at energies as high as 3 MeV above threshold is attributed to a mismatch between the wave functions of the initial and final states in the latter case. These findings suggest that in the region south-east of 132Sn nuclear structure effects may play a significant role in the neutron vs. γ competition in the decay of unbound states. As a consequence, the common neglect of such effects in the evaluation of the neutron-emission probabilities in calculations of global β-decay properties for astrophysical simulations may have to be reconsidered.

Published
2017

47. Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr 110

Author

Paul, N., Corsi, A., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Bally, B., Bender, M., Calvet, D., Château, F., Chen, Si, Delaroche, J., Delbart, A., Gheller, M., Giganon, A., Gillibert, A., Girod, M., Heenen, H., Lapoux, V., Libert, J., Motobayashi, T., Niikura, M., Otsuka, T., Rodríguez, R., Roussé, J., Sakurai, H., Santamaria, C., Shimizu, N., Steppenbeck, D., Taniuchi, R., Togashi, T., Tsunoda, Y., Uesaka, T., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, M., Carroll, R., Chung, L., Cortés, M., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Górska, M., Gottardo, A., Jungclaus, A., Lee, J., Lettmann, M., Linh, B. d., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nobs, R., Olivier, L., Patel, Z., Podolyák, Zs., Rudigier, M., Saito, T., Shand, C., Söderström, P.-A., Stefan, I., Orlandi, R., Vaquero, V., Werner, V., Wimmer, K., Xu, Z., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

48. Triaxiality of neutron-rich $^{84,86,88}$Ge from low-energy nuclear spectra

Author

Lettmann, M, Werner, V, Pietralla, N, Doornenbal, P, Obertelli, A, Rodríguez, TR, Sieja, K, Authelet, G, Baba, H, Calvet, D, Château, F, Chen, S, Corsi, A, Delbart, A, Gheller, J-M, Giganon, A, Gillibert, A, Lapoux, V, Motobayashi, T, Niikura, M, Paul, N, Roussé, J-Y, Sakurai, H, Santamaria, C, Steppenbeck, D, Taniuchi, R, Uesaka, T, Ando, T, Arici, T, Blazhev, A, Browne, F, Bruce, A, Caroll, RJ, Chung, LX, Cortés, ML, Dewald, M, Ding, B, Flavigny, F, Franchoo, S, Górska, M, Gottardo, A, Jungclaus, A, Lee, J, Linh, BD, Liu, J, Liu, Z, Lizarazo, C, Momiyama, S, Moschner, K, Nagamine, S, Nakatsuka, N, Nita, C, Nobs, CR, Olivier, L, Patel, Z, Podolyák, Zs, Rudigier, M, Saito, T, Shand, C, Söderström, P-A, Stefan, I, Vaquero, V, Wimmer, K, Xu, Zhengyu, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

γ-ray transitions between low-spin states of the neutron-rich 84,86,88Ge were measured by means of in-flight γ-ray spectroscopy at 270 MeV/u. Excited 6+1,4+1,2, and 2+1,2 states of 84,86Ge and 4+1 and 2+1,2 states of 88Ge were observed. Furthermore, a candidate for a 3+1 state of 86Ge was identified. This state plays a key role in the discussion of ground-state triaxiality of 86Ge, along with other features of its low-energy level scheme. A new region of triaxially deformed nuclei is proposed in the Ge isotopic chain. ispartof: Physical Review C vol:96 issue:1 status: published

Published
2017

49. Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60 : First Spectroscopy of $^{98,100}$Kr

Author

Flavigny, F., Doornenbal, P., Obertelli, A., Delaroche, J.P., Girod, M., Libert, J., Rodriguez, T.R., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Lapoux, V., Motobayashi, T., Niikura, M., Paul, N., Roussé, J.Y., Sakurai, H., Santamaria, C., Steppenbeck, D., Taniuchi, R., Uesaka, T., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Franchoo, S., Górska, M., Gottardo, A., Jungclaus, A., Lee, J., Lettmann, M., Linh, B.D., Liu, J., Liu, Z., Lizarazo, C., Momiyama, S., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nobs, C.R., Olivier, L., Orlandi, R., Patel, Z., Podolyák, Zs., Rudigier, M., Saito, T., Shand, C., Söderström, P.A., Stefan, I., Vaquero, V., Werner, V., Wimmer, K., Xu, Z., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

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

International audience; We report on the first γ-ray spectroscopy of low-lying states in neutron-rich $^{98,100}$Kr isotopes obtained from $^{99,101}$(p,2p) reactions at ∼220 MeV/nucleon. A reduction of the 21+ state energies beyond N=60 demonstrates a significant increase of deformation, shifted in neutron number compared to the sharper transition observed in strontium and zirconium isotopes. State-of-the-art beyond-mean-field calculations using the Gogny D1S interaction predict level energies in good agreement with experimental results. The identification of a low-lying (02+, 22+) state in $^{98}$Kr provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblate-prolate shape coexistence picture suggested by theory.

Published
2017

50. Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the T = −1 nucleus 70Kr

Author

Wimmer, K., primary, Korten, W., additional, Arici, T., additional, Doornenbal, P., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Doherty, D.T., additional, Gerl, J., additional, Gernhäuser, R., additional, Jenkins, D., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Obertelli, A., additional, Lubos, D., additional, Rubio, B., additional, Sahin, E., additional, Saito, T.Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Wadsworth, R., additional, and Zielinska, M., additional

Published
2018
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