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371 results on '"Steppenbeck, D."'

151. Persistence of the $Z=28$ Shell Gap Around $^{78}\mathrm{Ni}$: First Spectroscopy of $^{79}\mathrm{Cu}$

Author

Olivier, L., Franchoo, S., Niikura, M., Vajta, Z., Sohler, D., Doornenbal, P., Obertelli, A., Tsunoda, Y., Otsuka, T., Authelet, G., Baba, H., Calvet, D., Château, F., Corsi, A., Delbart, A., Gheller, J.M., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Otsu, H., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J.Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Browne, F., Chung, L.X., Dombradi, Z., Flavigny, F., Giacoppo, F., Gottardo, A., Hadyńska-Klęk, K., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Nishimura, S., Ogata, K., Ota, S., Patel, Z., Sahin, E., Shand, C., Söderström, P.A., Stefan, I., Steppenbeck, D., Sumikama, T., Suzuki, D., Werner, V., Wu, J., Xu, Z., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), 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, Physics::Accelerator Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; In-beam γ-ray spectroscopy of Cu79 is performed at the Radioactive Isotope Beam Factory of RIKEN. The nucleus of interest is produced through proton knockout from a Zn80 beam at 270 MeV/nucleon. The level scheme up to 4.6 MeV is established for the first time and the results are compared to Monte Carlo shell-model calculations. We do not observe significant knockout feeding to the excited states below 2.2 MeV, which indicates that the Z=28 gap at N=50 remains large. The results show that the Cu79 nucleus can be described in terms of a valence proton outside a Ni78 core, implying the magic character of the latter.

Published
2017
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152. 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

153. 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
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154. 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
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155. Investigating the strength of the N=34 subshell closure in ^<54>Ca

Author

Steppenbeck, D, Takeuchi, S, Aoi, N, Doornenbal, P, Lee, J, Matsushita, M, Wang, H, Baba, H, Fukuda, N, Go, S, Honma, M, Matsui, K, Michimasa, S, Motobayashi, T, Nishimura, D, Otsuka, T, Sakurai, H, Shiga, Y, Söderström, P-A, Sumikama, T, Suzuki, H, Taniuchi, R, Utsuno, Y, Valiente-Dobón, J J, and Yoneda, K

Published
2013

156. Mapping the deformation in the 'island of inversion': Inelastic scattering of Ne 30 and Mg 36 at intermediate energies

Author

Doornenbal, P., Scheit, H., Takeuchi, S., Aoi, N., Li, K., Matsushita, M., Steppenbeck, D., Wang, H., Baba, H., Ideguchi, E., Kobayashi, N., Kondo, Y., Lee, J., Michimasa, S., Motobayashi, T., Poves, Alfredo, Sakurai, H., Takechi, M., Togano, Y., Yoneda, K., and UAM. Departamento de Física Teórica

Subjects
Inelastic scattering, Ne, Mg, Física
Abstract

The transition strengths of the first-excited 2+ states and deformation lengths of the nuclei Ne30 and Mg36 were determined via Coulomb- and nuclear-force-dominated inelastic scattering at intermediate energies. Beams of these exotic nuclei were produced at the RIKEN Radioactive Isotope Beam Factory and were incident on lead and carbon targets at energies above 200 MeV/u. Absolute excitation cross sections on the lead target yielded reduced transition probabilities of 0.0277(79) and 0.0528(121) e2b2, while the measurements with the carbon target revealed nuclear deformation lengths of δN=1.98(11) and 1.93(11) fm for Ne30 and Mg36, respectively. Corresponding quadrupole deformation parameters of β2∼0.5 from the two probes were found comparable in magnitude, showing no indication for a reduction in deformation along isotopic and isotonic chains from Mg32 towards the neutron drip-line. Comparisons to shell-model calculations illustrate the importance of neutron excitations across the N=20 shell for Ne30 and suggest that shallow maximums of collectivity may occur around N=22 and 24 along the neon and magnesium isotopic chains, respectively, A.P. is partly supported by MINECO (Spain) Grant No. FPA2014-57196 and Programme “Centros de Excelencia Severo Ochoa” SEV-2012-0249

Published
2016

157. Structure of Sc55 and development of the N=34 subshell closure

Author

Steppenbeck, D., primary, Takeuchi, S., additional, Aoi, N., additional, Doornenbal, P., additional, Matsushita, M., additional, Wang, H., additional, Baba, H., additional, Go, S., additional, Holt, J. D., additional, Lee, J., additional, Matsui, K., additional, Michimasa, S., additional, Motobayashi, T., additional, Nishimura, D., additional, Otsuka, T., additional, Sakurai, H., additional, Shiga, Y., additional, Söderström, P.-A., additional, Stroberg, S. R., additional, Sumikama, T., additional, Taniuchi, R., additional, Tostevin, J. A., additional, Utsuno, Y., additional, Valiente-Dobón, J. J., additional, and Yoneda, K., additional

Published
2017
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158. Persistence of the Z=28 Shell Gap Around Ni78 : First Spectroscopy of Cu79

Author

Olivier, L., primary, Franchoo, S., additional, Niikura, M., additional, Vajta, Z., additional, Sohler, D., additional, Doornenbal, P., additional, Obertelli, A., additional, Tsunoda, Y., additional, Otsuka, T., additional, Authelet, G., additional, Baba, H., additional, Calvet, D., additional, Château, F., additional, Corsi, A., additional, Delbart, A., additional, Gheller, J.-M., additional, Gillibert, A., additional, Isobe, T., additional, Lapoux, V., additional, Matsushita, M., additional, Momiyama, S., additional, Motobayashi, T., 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, Takeuchi, S., additional, Taniuchi, R., additional, Uesaka, T., additional, Wang, H., additional, Yoneda, K., additional, Browne, F., additional, Chung, L. X., additional, Dombradi, Z., additional, Flavigny, F., additional, Giacoppo, F., additional, Gottardo, A., additional, Hadyńska-Klęk, K., additional, Korkulu, Z., additional, Koyama, S., additional, Kubota, Y., additional, Lee, J., additional, Lettmann, M., additional, Louchart, C., additional, Lozeva, R., additional, Matsui, K., additional, Miyazaki, T., additional, Nishimura, S., additional, Ogata, K., additional, Ota, S., additional, Patel, Z., additional, Sahin, E., additional, Shand, C., additional, Söderström, P.-A., additional, Stefan, I., additional, Steppenbeck, D., additional, Sumikama, T., additional, Suzuki, D., additional, Werner, V., additional, Wu, J., additional, and Xu, Z., additional

Published
2017
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159. Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81,82,83,84 Zn

Author

Shand, C.M., primary, Podolyák, Zs., additional, Górska, M., additional, Doornenbal, P., additional, Obertelli, A., additional, Nowacki, F., additional, Otsuka, T., additional, Sieja, K., additional, Tostevin, J.A., additional, Tsunoda, Y., additional, Authelet, G., additional, Baba, H., additional, Calvet, D., additional, Château, A., 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, 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.J., additional, Chung, L.X., additional, Cortés, M.L., additional, Dewald, M., additional, Ding, B., additional, Dombrádi, Zs., additional, Flavigny, F., additional, Franchoo, S., additional, Giacoppo, F., additional, Gottardo, A., additional, Hadyńska-Klęk, K., additional, Jungclaus, A., additional, Korkulu, Z., additional, Koyama, S., additional, Kubota, Y., 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, M., additional, Nakatsuka, N., additional, Nishimura, S., additional, Nita, C.R., additional, Nobs, C.R., additional, Olivier, L., additional, Ota, S., additional, Orlandi, R., additional, Patel, Z., additional, Regan, P.H., additional, Rudigier, M., additional, Şahin, E., additional, Saito, T., additional, Söderström, P.-A., additional, Stefan, I., additional, Sumikama, T., additional, Suzuki, D., additional, Vajta, Zs., additional, Vaquero, V., additional, Werner, V., additional, Wimmer, K., additional, Wu, J., additional, and Xu, Z.Y., additional

Published
2017
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160. In-beam γ -ray spectroscopy of Mg35 via knockout reactions at intermediate energies

Author

Momiyama, S., primary, Doornenbal, P., additional, Scheit, H., additional, Takeuchi, S., additional, Niikura, M., additional, Aoi, N., additional, Li, K., additional, Matsushita, M., additional, Steppenbeck, D., additional, Wang, H., additional, Baba, H., additional, Ideguchi, E., additional, Kimura, M., additional, Kobayashi, N., additional, Kondo, Y., additional, Lee, J., additional, Michimasa, S., additional, Motobayashi, T., additional, Shimizu, N., additional, Takechi, M., additional, Togano, Y., additional, Utsuno, Y., additional, Yoneda, K., additional, and Sakurai, H., additional

Published
2017
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161. Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra

Author

Lettmann, M., primary, Werner, V., additional, Pietralla, N., additional, Doornenbal, P., additional, Obertelli, A., additional, Rodríguez, T. R., additional, Sieja, K., 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, Blazhev, A., additional, Browne, F., additional, Bruce, A., additional, Caroll, R. J., 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, Jungclaus, A., additional, Lee, J., additional, Linh, B. D., additional, Liu, J., additional, Liu, Z., additional, Lizarazo, C., additional, Momiyama, S., additional, Moschner, K., additional, Nagamine, S., additional, Nakatsuka, N., additional, Nita, C., additional, Nobs, C. R., additional, Olivier, L., 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, Wimmer, K., additional, and Xu, Z., additional

Published
2017
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162. Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60 : First Spectroscopy of Kr98,100

Author

Flavigny, F., primary, Doornenbal, P., additional, Obertelli, A., additional, Delaroche, J.-P., additional, Girod, M., additional, Libert, J., additional, Rodriguez, T. R., 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, Blazhev, A., additional, Browne, F., additional, Bruce, A., additional, Carroll, R., additional, Chung, L. X., additional, Cortés, M. L., additional, Dewald, M., additional, Ding, B., additional, Franchoo, S., additional, Górska, M., additional, Gottardo, A., 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, Moschner, K., additional, Nagamine, S., additional, Nakatsuka, N., additional, Nita, C., additional, Nobs, C. R., 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
2017
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163. Observation of isoscalar and isovector dipole excitations in neutron-rich 20 O

Author

Nakatsuka, N., primary, Baba, H., additional, Aumann, T., additional, Avigo, R., additional, Banerjee, S.R., additional, Bracco, A., additional, Caesar, C., additional, Camera, F., additional, Ceruti, S., additional, Chen, S., additional, Derya, V., additional, Doornenbal, P., additional, Giaz, A., additional, Horvat, A., additional, Ieki, K., additional, Inakura, T., additional, Imai, N., additional, Kawabata, T., additional, Kobayashi, N., additional, Kondo, Y., additional, Koyama, S., additional, Kurata-Nishimura, M., additional, Masuoka, S., additional, Matsushita, M., additional, Michimasa, S., additional, Million, B., additional, Motobayashi, T., additional, Murakami, T., additional, Nakamura, T., additional, Ohnishi, T., additional, Ong, H.J., additional, Ota, S., additional, Otsu, H., additional, Ozaki, T., additional, Saito, A., additional, Sakurai, H., additional, Scheit, H., additional, Schindler, F., additional, Schrock, P., additional, Shiga, Y., additional, Shikata, M., additional, Shimoura, S., additional, Steppenbeck, D., additional, Sumikama, T., additional, Syndikus, I., additional, Takeda, H., additional, Takeuchi, S., additional, Tamii, A., additional, Taniuchi, R., additional, Togano, Y., additional, Tscheuschner, J., additional, Tsubota, J., additional, Wang, H., additional, Wieland, O., additional, Wimmer, K., additional, Yamaguchi, Y., additional, Yoneda, K., additional, and Zenihiro, J., additional

Published
2017
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164. Low-lying structure and shape evolution in neutron-rich Se isotopes

Author

Chen, S., primary, Doornenbal, P., additional, Obertelli, A., additional, Rodríguez, T. R., additional, Authelet, G., additional, Baba, H., additional, Calvet, D., additional, Château, F., 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, Blazhev, A., 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, 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, Moschner, K., additional, Nagamine, S., additional, Nakatsuka, N., additional, Nita, C. R., additional, Nobs, C., additional, Olivier, L., additional, Orlandi, R., additional, Patel, Z., additional, Podolyak, 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
2017
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165. Low- Z shore of the “island of inversion” and the reduced neutron magicity toward O28

Author

Doornenbal, P., primary, Scheit, H., additional, Takeuchi, S., additional, Utsuno, Y., additional, Aoi, N., additional, Li, K., additional, Matsushita, M., additional, Steppenbeck, D., additional, Wang, H., additional, Baba, H., additional, Ideguchi, E., additional, Kobayashi, N., additional, Kondo, Y., additional, Lee, J., additional, Michimasa, S., additional, Motobayashi, T., additional, Otsuka, T., additional, Sakurai, H., additional, Takechi, M., additional, Togano, Y., additional, and Yoneda, K., additional

Published
2017
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166. Intruder configurations in the ground state of 30Ne

Author

Liu, H.N., primary, Lee, J., additional, Doornenbal, P., additional, Scheit, H., additional, Takeuchi, S., additional, Aoi, N., additional, Li, K.A., additional, Matsushita, M., additional, Steppenbeck, D., additional, Wang, H., additional, Baba, H., additional, Ideguchi, E., additional, Kobayashi, N., additional, Kondo, Y., additional, Lee, G., additional, Michimasa, S., additional, Motobayashi, T., additional, Poves, A., additional, Sakurai, H., additional, Takechi, M., additional, Togano, Y., additional, Tostevin, J.A., additional, and Utsuno, Y., additional

Published
2017
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167. Extension of the N=40 Island of Inversion towards N=50: Spectroscopy of Cr66, Fe70,72

Author

Santamaria, C., Louchart, C., Obertelli, A., Werner, V., Doornenbal, P., Nowacki, F., Authelet, G., Baba, H., Calvet, D., Château, F., Corsi, A., Delbart, A., Gheller, J.-M., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Péron, C., Peyaud, A., Pollacco, E. C., Roussé, J.-Y., Sakurai, H., Sasano, M., Shiga, Y., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Browne, F., Chung, L. X., Dombradi, Zs., Franchoo, S., Giacoppo, F., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Lozeva, Radomira, Matsui, K., Miyazaki, T., Nishimura, S., Olivier, L., Ota, S., Patel, Z., Pietralla, N., Sahin, E., Shand, C., Söderström, P.-A., Stefan, I., Steppenbeck, D., Sumikama, T., Suzuki, D., Vajta, Zs., 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, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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 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), 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.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; We report on the measurement of the first 2+ and 4+ states of Cr66 and Fe70,72 via in-beam γ-ray spectroscopy. The nuclei of interest were produced by (p,2p) reactions at incident energies of 260 MeV/nucleon. The experiment was performed at the Radioactive Isotope Beam Factory, RIKEN, using the DALI 2γ-ray detector array and the novel MINOS device, a thick liquid hydrogen target combined with a vertex tracker. A low-energy plateau of 2+1 and 4+1 energies as a function of the neutron number was observed for N≥38 and N≥40 for even-even Cr and Fe isotopes, respectively. State-of-the-art shell model calculations with a modified Lenzi-Nowacki-Poves-Sieja (LNPS) interaction in the pfg9/2d5/2 valence space reproduce the observations. Interpretation within the shell model shows an extension of the island of inversion at N=40 for more neutron-rich isotopes towards N=50.

Published
2015
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168. Low-Lying Structure of ⁵⁰Ar and the N = 32 Subshell Closure

Author

Steppenbeck, D.

Subjects
AAM, 20152019VQR
Abstract

The low-lying structure of the neutron-rich nucleus 50Ar has been investigated at the Radioactive Isotope Beam Factory using in-beam γ-ray spectroscopy with 9Be (54Ca, 50Ar+γ) X,9Be(55Sc,50Ar+γ)X, and 9Be(56Ti, 50Ar + γ)X multinucleon removal reactions at ∼220 MeV/u. A γ-ray peak at 1178(18) keV is reported and assigned as the transition from the first 2+ state to the 0+ ground state. A weaker, tentative line at 1582(38) keV is suggested as the 4+1→2+1 transition. The experimental results are compared to large-scale shell-model calculations performed in the sdpf model space using the SDPF-MU effective interaction with modifications based on recent experimental data for exotic calcium and potassium isotopes. The modified Hamiltonian provides a satisfactory description of the new experimental results for 50Ar and, more generally, reproduces the energy systematics of low-lying states in neutron-rich Ar isotopes rather well. The shell-model calculations indicate that the N=32 subshell gap in 50Ar is similar in magnitude to those in 52Ca and 54Ti and, notably, predict an N=34 subshell closure in 52Ar that is larger than the one recently reported in 54Ca.

Published
2015
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169. Neutron-driven collectivity in light tin isotopes: Proton inelastic scattering from Sn

Author

Corsi, A., Boissinot, S., Obertelli, A., Doornenbal, P., Dupuis, M., Lechaftois, F., Matsushita, M., Péru, S., Takeuchi, S., Wang, H., Aoi, N., Baba, H., Bednarczyk, P., Ciemala, M., Gillibert, A., Isobe, T., Jungclaus, A., Lapoux, V., Lee, J., Martini, M., Matsui, K., Motobayashi, T., Nishimura, D., Ota, S., Pollacco, E., Sakurai, H., Santamaria, C., Shiga, Y., Sohler, D., Steppenbeck, D., and Taniuchi, R.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Inelastic scattering cross sections to individual bound excited states of 104Sn were measured at 150 MeV/u beam energy and analyzed to evaluate the contribution of neutron and proton collectivity. State-of-the-art Quasi-Particle Random Phase Approximation (QRPA) with the D1M Gogny interaction reproduces the experimental proton collectivity and our inelastic scattering cross sections once used as input for a reaction calculation together with the Jeukenne–Lejeune–Mahaux (JLM) potentials. Experimental inelastic scattering cross section decreases by 40(24)% from 112Sn to 104Sn. The present work shows that (i) proton and neutron collectivities are proportional over a large range of tin isotopes (including 104Sn), as is typical for isoscalar excitations, and (ii) the neutron collectivity dominates. It suggests that the plateau in the mass range A=106–112 displayed by E2 transition probabilities is driven by neutron collectivity.

Published
2015

170. Observation of isoscalar and isovector dipole excitations in neutron-rich 20 O

Author

Nakatsuka, N., Baba, H., Aumann, T., Avigo, R., Banerjee, S.R., Bracco, A., Caesar, C., Camera, F., Ceruti, S., Chen, S., Derya, V., Doornenbal, P., Giaz, A., Horvat, A., Ieki, K., Inakura, T., Imai, N., Kawabata, T., Kobayashi, N., Kondo, Y., Koyama, S., Kurata-Nishimura, M., Masuoka, S., Matsushita, M., Michimasa, S., Million, B., Motobayashi, T., Murakami, T., Nakamura, T., Ohnishi, T., Ong, H.J., Ota, S., Otsu, H., Ozaki, T., Saito, A., Sakurai, H., Scheit, H., Schindler, F., Schrock, P., Shiga, Y., Shikata, M., Shimoura, S., Steppenbeck, D., Sumikama, T., Syndikus, I., Takeda, H., Takeuchi, S., Tamii, A., Taniuchi, R., Togano, Y., Tscheuschner, J., Tsubota, J., Wang, H., Wieland, O., Wimmer, K., Yamaguchi, Y., Yoneda, K., Zenihiro, J., Nakatsuka, N., Baba, H., Aumann, T., Avigo, R., Banerjee, S.R., Bracco, A., Caesar, C., Camera, F., Ceruti, S., Chen, S., Derya, V., Doornenbal, P., Giaz, A., Horvat, A., Ieki, K., Inakura, T., Imai, N., Kawabata, T., Kobayashi, N., Kondo, Y., Koyama, S., Kurata-Nishimura, M., Masuoka, S., Matsushita, M., Michimasa, S., Million, B., Motobayashi, T., Murakami, T., Nakamura, T., Ohnishi, T., Ong, H.J., Ota, S., Otsu, H., Ozaki, T., Saito, A., Sakurai, H., Scheit, H., Schindler, F., Schrock, P., Shiga, Y., Shikata, M., Shimoura, S., Steppenbeck, D., Sumikama, T., Syndikus, I., Takeda, H., Takeuchi, S., Tamii, A., Taniuchi, R., Togano, Y., Tscheuschner, J., Tsubota, J., Wang, H., Wieland, O., Wimmer, K., Yamaguchi, Y., Yoneda, K., and Zenihiro, J.

Published
2017

171. Low-lying structure and shape evolution in neutron-rich Se isotopes

Author

Chen, S., Doornenbal, P., Obertelli, A., Rodriguez, T. R., 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, A. M., Caroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, 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. R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyak, Zs., Rudigier, M., Saito, T., Shand, C., Soederstroem, P. -A., Stefan, I., Vaquero, V., Werner, V., Wimmer, K., Xu, Z., Chen, S., Doornenbal, P., Obertelli, A., Rodriguez, T. R., 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, A. M., Caroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, 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. R., Nobs, C., Olivier, L., Orlandi, R., Patel, Z., Podolyak, Zs., Rudigier, M., Saito, T., Shand, C., Soederstroem, P. -A., Stefan, I., Vaquero, V., Werner, V., Wimmer, K., and Xu, Z.

Abstract

Neutron-rich Se-88,Se-90,Se-92,Se-94 isotopes were studied via in-beam gamma-ray spectroscopy after nucleon removal reactions at intermediate energies at the Radioactive Isotope Beam Factory. Based on gamma-gamma coincidence analysis, low-lying excitation level schemes are proposed for these nuclei, including the 2(1)(+), 4(1)(+) states and 2(2)(+) states at remarkably low energies. The low-lying 2(2)(+) states, along with other features, indicate triaxiality in these nuclei. The experimental results are in good overall agreement with self-consistent beyond-mean-field calculations based on the Gogny D1S interaction, which suggests both triaxial degree of freedom and shape coexistence playing important roles in the description of intrinsic deformations in neutron-rich Se isotopes.

Published
2017

172. Observation of isoscalar and isovector dipole excitations in neutron-rich O-20

Author

Nakatsuka, N., Baba, H., Aumann, T., Avigo, R., Banerjee, S. R., Bracco, A., Caesar, C., Camera, F., Ceruti, S., Chen, S., Derya, V., Doornenbal, P., Giaz, A., Horvat, A., Ieki, K., Inakura, T., Imai, N., Kawabata, T., Kobayashi, N., Kondo, Y., Koyama, S., Kurata-Nishimura, M., Masuoka, S., Matsushita, M., Michimasa, S., Million, B., Motobayashi, T., Murakami, T., Nakamura, T., Ohnishi, T., Ong, H. J., Ota, S., Otsu, H., Ozaki, T., Saito, A., Sakurai, H., Scheit, H., Schindler, F., Schrock, P., Shiga, Y., Shikata, M., Shimoura, S., Steppenbeck, D., Sumikama, T., Syndikus, I., Takeda, H., Takeuchi, S., Tamii, A., Taniuchi, R., Togano, Y., Tscheuschner, J., Tsubota, J., Wang, H., Wieland, O., Wimmer, K., Yamaguchi, Y., Yoneda, K., Zenihiro, J., Nakatsuka, N., Baba, H., Aumann, T., Avigo, R., Banerjee, S. R., Bracco, A., Caesar, C., Camera, F., Ceruti, S., Chen, S., Derya, V., Doornenbal, P., Giaz, A., Horvat, A., Ieki, K., Inakura, T., Imai, N., Kawabata, T., Kobayashi, N., Kondo, Y., Koyama, S., Kurata-Nishimura, M., Masuoka, S., Matsushita, M., Michimasa, S., Million, B., Motobayashi, T., Murakami, T., Nakamura, T., Ohnishi, T., Ong, H. J., Ota, S., Otsu, H., Ozaki, T., Saito, A., Sakurai, H., Scheit, H., Schindler, F., Schrock, P., Shiga, Y., Shikata, M., Shimoura, S., Steppenbeck, D., Sumikama, T., Syndikus, I., Takeda, H., Takeuchi, S., Tamii, A., Taniuchi, R., Togano, Y., Tscheuschner, J., Tsubota, J., Wang, H., Wieland, O., Wimmer, K., Yamaguchi, Y., Yoneda, K., and Zenihiro, J.

Abstract

The isospin characters of low-energy dipole excitations in neutron-rich unstable nucleus O-20 were investigated, for the first time in unstable nuclei. Two spectra obtained from a dominant isovector probe (O-20 + Au) and a dominant isoscalar probe (O-20 + alpha) were compared and analyzed by the distorted-wave Born approximation to extract independently the isovector and isoscalar dipole strengths. Two known 1(-) states with large isovector dipole strengths at energies of 5.36(5) MeV (1(1)(-)) and 6.84(7) MeV (1(2)(-)) were also excited by the isoscalar probe. These two states were found to have different isoscalar dipole strengths, 2.70(32)%(1(1)(-)) and 0.67(12)%(1(2)(-)), respectively, in exhaustion of the isoscalar dipole-energy-weighted sum rule. The difference in isoscalar strength indicated that they have different underlying structures. (C) 2017 The Author(s). Published by Elsevier B.V.

Published
2017

173. Triaxiality of neutron-rich Ge-84,Ge-86,Ge-88 from low-energy nuclear spectra

Author

Lettmann, M., Werner, V., Pietralla, N., Doornenbal, P., Obertelli, A., Rodriguez, T. R., Sieja, K., 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., Blazhev, A., Browne, F., Bruce, A., Caroll, R. J., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, M., Gottardo, A., Jungclaus, A., Lee, 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., Podolyak, Zs., Rudigier, M., Saito, T., Shand, C., Soederstroem, P. -A., Stefan, I., Vaquero, V., Wimmer, K., Xu, Z., Lettmann, M., Werner, V., Pietralla, N., Doornenbal, P., Obertelli, A., Rodriguez, T. R., Sieja, K., 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., Blazhev, A., Browne, F., Bruce, A., Caroll, R. J., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gorska, M., Gottardo, A., Jungclaus, A., Lee, 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., Podolyak, Zs., Rudigier, M., Saito, T., Shand, C., Soederstroem, P. -A., Stefan, I., Vaquero, V., Wimmer, K., and Xu, Z.

Abstract

gamma-ray transitions between low-spin states of the neutron-rich Ge-84,Ge-86,Ge-88 were measured by means of in-flightm gamma-ray spectroscopy at 270 MeV/u. Excited 6(1)(+), 4(1)(+),(2), and 2(+) (1,2) states of Ge-84,Ge-86 and 4(1)(+) and 2(1,2)(+) states of Ge-88 were observed. 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 its low-energy level scheme. A new region of triaxially deformed nuclei is proposed in the Ge isotopic chain.

Published
2017

174. Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60: First Spectroscopy of Kr-98,Kr-100

Author

Flavigny, F., Doornenbal, P., Obertelli, A., Delaroche, J. -P., Girod, M., Libert, J., Rodriguez, T. R., 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., Blazhev, A., Browne, F., Bruce, A., Carroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Franchoo, S., Gorska, 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., Podolyak, Zs., Rudigier, M., Saito, T., Shand, C., Soderstrom, P. A., Stefan, I., Vaquero, V., Werner, V., Wimmer, K., Xu, Z., Flavigny, F., Doornenbal, P., Obertelli, A., Delaroche, J. -P., Girod, M., Libert, J., Rodriguez, T. R., 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., Blazhev, A., Browne, F., Bruce, A., Carroll, R., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Franchoo, S., Gorska, 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., 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 the first gamma-ray spectroscopy of low-lying states in neutron-rich Kr-98,Kr-100 isotopes obtained from (99,101)Rbd (p,2p) reactions at similar to 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-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 (0(2)(+),2(2)(+)) state in Kr-98 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

175. Shell evolution beyond Z=28 and N=50: Spectroscopy of Zn-81,Zn-82,Zn-83,Zn-84

Author

Shand, C. M., Podolyak, Zs., Gorska, M., Doornenbal, P., Obertelli, A., Nowacki, F., Otsuka, T., Sieja, K., Tostevin, J. A., Tsunoda, Y., Authelet, G., Baba, H., Calvet, D., Chateau, A., Chenh, 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., 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. J., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Dombradi, Zs., Flavigny, F., Franchoo, S., Giacoppo, F., Gottardo, A., Hadynska-Klek, K., Jungclaus, A., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, M., Nakatsuka, N., Nishimura, S., Nita, C. R., Nobs, C. R., Olivier, L., Ota, S., Orlandi, R., Patel, Z., Regan, P. H., Rudigier, M., Sahin, E., Saito, T., Soderstrom, P. -A., Stefan, I., Sumikama, T., Suzuki, D., Vajta, Zs., Vaquero, V., Werner, V., Wimmer, K., Wu, J., Xu, Z. Y., Shand, C. M., Podolyak, Zs., Gorska, M., Doornenbal, P., Obertelli, A., Nowacki, F., Otsuka, T., Sieja, K., Tostevin, J. A., Tsunoda, Y., Authelet, G., Baba, H., Calvet, D., Chateau, A., Chenh, 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., 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. J., Chung, L. X., Cortes, M. L., Dewald, M., Ding, B., Dombradi, Zs., Flavigny, F., Franchoo, S., Giacoppo, F., Gottardo, A., Hadynska-Klek, K., Jungclaus, A., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Linh, B. D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, M., Nakatsuka, N., Nishimura, S., Nita, C. R., Nobs, C. R., Olivier, L., Ota, S., Orlandi, R., Patel, Z., Regan, P. H., Rudigier, M., Sahin, E., Saito, T., Soderstrom, P. -A., Stefan, I., Sumikama, T., Suzuki, D., Vajta, Zs., Vaquero, V., Werner, V., Wimmer, K., Wu, J., and Xu, Z. Y.

Abstract

We report on the measurement of new low-lying states in the neutron-rich Zn-81,Zn-82,Zn-83,Zn-84 nuclei via inbeam gamma-ray spectroscopy. These include the 4(1)(+)-> 2(1)(+) transition in Zn-82, the 2(1)(+) -> 0(g.s.)(+) and 4(1)(+)-> 2(1)(+) transitions in Zn-84, and low-lying states in Zn-81,Zn-83 were observed for the first time. The reduced E(2(1)(+)) energies and increased E(4(1)(+))/ E(2(1)(+)) ratios at N= 52, 54 compared to those in Zn-80 attest that the magicity is confined to the neutron number N= 50only. The deduced level schemes are compared to three state-of-the-art shell model calculations and a good agreement is observed with all three calculations. The newly observed 2(+) and 4(+) levels in Zn-84 suggest the onset of deformation towards heavier Zn isotopes, which has been incorporated by taking into account the upper sdgorbitals in the Ni78-II and the PFSDG-U models. (C) 2017 The Authors. Published by Elsevier B.V.

Published
2017

176. 「反転の島」の小さな陽子数側の岸と28Oにかけての減少した中性子の魔法性

Author

Doornenbal, P., Scheit, H., Takeuchi, Satoshi, Utsuno, Yutaka, Aoi, Nori, Li, K., Matsushita, Masafumi, Steppenbeck, D., Wang, H., Baba, Hidetada, Ideguchi, Eiji, Kobayashi, Nobuyuki, Kondo, Yosuke, Lee, J., Michimasa, Shinichiro, Motobayashi, Toru, Otsuka, Takaharu, Sakurai, Hiroyoshi, Takechi, Maya, Togano, Yasuhiro, and Yoneda, Kenichiro

Abstract

中性子数20の魔法数は$^{32}$Mg近傍の中性子過剰核領域で消失することが知られており、その一群の原子核は核図表における「反転の島」と呼ばれている。陽子数が10よりも小さな原子核が反転の島に含まれるかどうかを示す実験的証拠はこれまでなかった。この研究では、理化学研究所RIビームファクトリー(理研RIBF)にて生成された中性子過剰核$^{29}$Fのインビーム$\gamma$線分光から、$^{29}$Fの第一励起状態を初めて観測することに成功した。その励起エネルギーは1080(80)keVであり、中性子数20魔法数を仮定した計算による励起エネルギーの値である約3MeVよりも著しく小さいことから、この魔法数が消滅していることが明らかとなった。大規模殻模型計算によって励起エネルギーの実験値を再現することに成功するとともに、$^{29}$Fの基底状態および第一励起状態は中性子が2個殻ギャップから励起した状態によって支配されることがわかった。この第一励起状態は$^{28}$Oの第一励起状態に$d_{5/2}$軌道を占める陽子を結合させた状態が主であり、そのエネルギーが低いことから、$^{28}$Oは二重閉殻構造をもたないと考えられる。

Published
2017

177. Intermediate-energy Coulomb excitation of 104 Sn: Moderate E2 strength decrease approaching 100 Sn

Author

Doornenbal, P., Takeuchi, S., Aoi, N., Matsushita, M., Obertelli, A., Steppenbeck, D., Wang, H., Audirac, L., Baba, H., Bednarczyk, P., Boissinot, S., Ciemala, M., Corsi, A., Furumoto, T., Isobe, T., Jungclaus, A., Lapoux, V., Lee, J., Matsui, K., Motobayashi, T., Nishimura, D., Ota, S., Pollacco, E. C., Sakurai, H., Santamaria, C., Shiga, Y., Sohler, D., Taniuchi, R., RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Research Center for Nuclear Physics, Osaka University, Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama, 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, Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland, National Institute of Technology, Ichinoseki College, Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Department of Physics, University of Tokyo, Bunkyo, Tokyo, Department of Physics, Tokyo University of Science, Noda, Chiba, Department of Physics [Tokyo], Rikkyo University [Tokyo], Institute for Nuclear Research [Budapest] (ATOMKI), and Hungarian Academy of Sciences (MTA)

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

International audience; The reduced transition probability B(E2)↑ of the first excited 2 + state in the nucleus 104 Sn was measured via Coulomb excitation in inverse kinematics at intermediate energies. A value of 0.173(28) e 2 b 2 was extracted from the absolute cross section on a Pb target. Feeding contributions in 104 Sn from higher lying states were estimated by a reference measurement of the stable 112 Sn. Corresponding only to a moderate decrease of excitation strength relative to the almost constant values observed in the proton-rich, even-A 106−114 Sn isotopes, present state-of-the-art shell-model predictions, which include proton and neutron excitations across the N = Z = 50 shell closures as well as standard polarization charges, underestimate the experimental findings.

Published
2014
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178. Shell and shape evolution at N=28: The Mg40 ground state

Author

Crawford, HL, Fallon, P, Macchiavelli, AO, Clark, RM, Brown, BA, Tostevin, JA, Bazin, D, Aoi, N, Doornenbal, P, Matsushita, M, Scheit, H, Steppenbeck, D, Takeuchi, S, Baba, H, Campbell, CM, Cromaz, M, Ideguchi, E, Kobayashi, N, Kondo, Y, Lee, G, Lee, IY, Lee, J, Li, K, Michimasa, S, Motobayashi, T, Nakamura, T, Ota, S, Paschalis, S, Petri, M, Sako, T, Sakurai, H, Shimoura, S, Takechi, M, Togano, Y, Wang, H, and Yoneda, K

Abstract

A measurement of the direct two-proton removal from Si42 has provided the first structural information on the N=28 isotone Mg40. The value for the inclusive cross section for two-proton removal from Si42 of 40+27−17 μb is significantly lower than that predicted by structure calculations using the recent SDPF-MU shell-model effective interaction combined with eikonal reaction theory. This observed discrepancy is consistent with the interpretation that only one of the predicted low-lying 0+ states in Mg40 is bound. A two-state mixing analysis describing two-proton knockout cross sections along N=28 provides support for the interpretation of a prolate-deformed Mg40 ground state.

Published
2014

179. First spectroscopic information from even-even nuclei in the region “southeast” of Sn132 : Neutron-excitation dominance of the 21+ state in Cd132

Author

Wang, H., primary, Aoi, N., additional, Takeuchi, S., additional, Matsushita, M., additional, Motobayashi, T., additional, Steppenbeck, D., additional, Yoneda, K., additional, Baba, H., additional, Dombrádi, Zs., additional, Kobayashi, K., additional, Kondo, Y., additional, Lee, J., additional, Liu, H., additional, Minakata, R., additional, Nishimura, D., additional, Otsu, H., additional, Sakurai, H., additional, Sohler, D., additional, Sun, Y., additional, Tian, Z., additional, Tanaka, R., additional, Vajta, Zs., additional, Yang, Z., additional, Yamamoto, T., additional, Ye, Y., additional, and Yokoyama, R., additional

Published
2016
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180. Asymmetry dependence of reduction factors from single-nucleon knockout of30Ne at ∼ 230 MeV/nucleon

Author

Lee, J., primary, Liu, H., additional, Doornenbal, P., additional, Kimura, M., additional, Minomo, K., additional, Ogata, K., additional, Utsuno, Y., additional, Aoi, N., additional, Li, K., additional, Matsushita, M., additional, Scheit, H., additional, Steppenbeck, D., additional, Takeuchi, S., additional, Wang, H., additional, Baba, H., additional, Ideguchi, E., additional, Kobayashi, N., additional, Kondo, Y., additional, Michimasa, S., additional, Motobayashi, T., additional, Sakurai, H., additional, Takechi, M., additional, and Togano, Y., additional

Published
2016
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181. Inelastic scattering of72,74Ni off a proton target

Author

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

Published
2016
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182. Erratum: Investigating nuclear shell structure in the vicinity ofNi78: Low-lying excited states in the neutron-rich isotopesZn80,82[Phys. Rev. C93, 024320 (2016)]

Author

Shiga, Y., primary, Yoneda, K., additional, Steppenbeck, D., additional, Aoi, N., additional, Doornenbal, P., additional, Lee, J., additional, Liu, H., additional, Matsushita, M., additional, Takeuchi, S., additional, Wang, H., additional, Baba, H., additional, Bednarczyk, P., additional, Dombradi, Zs., additional, Fulop, Zs., additional, Go, S., additional, Hashimoto, T., additional, Honma, M., additional, Ideguchi, E., additional, Ieki, K., additional, Kobayashi, K., additional, Kondo, Y., additional, Minakata, R., additional, Motobayashi, T., additional, Nishimura, D., additional, Otsuka, T., additional, Otsu, H., additional, Sakurai, H., additional, Shimizu, N., additional, Sohler, D., additional, Sun, Y., additional, Tamii, A., additional, Tanaka, R., additional, Tian, Z., additional, Tsunoda, Y., additional, Vajta, Zs., additional, Yamamoto, T., additional, Yang, X., additional, Yang, Z., additional, Ye, Y., additional, Yokoyama, R., additional, and Zenihiro, J., additional

Published
2016
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183. Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

Author

Doornenbal, P., primary, Scheit, H., additional, Takeuchi, S., additional, Aoi, N., additional, Li, K., additional, Matsushita, M., additional, Steppenbeck, D., additional, Wang, H., additional, Baba, H., additional, Ideguchi, E., additional, Kobayashi, N., additional, Kondo, Y., additional, Lee, J., additional, Michimasa, S., additional, Motobayashi, T., additional, Poves, A., additional, Sakurai, H., additional, Takechi, M., additional, Togano, Y., additional, and Yoneda, K., additional

Published
2016
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184. In-beam Gamma-ray Spectroscopy of $^{38;40;42}$Si

Author

Matsushita, M., Takeuchi, S., Aoi, N., Doornenbal, P., Lee, J., Li, K., Motobayashi, T., Scheit, H., Steppenbeck, D., Wang, H., Baba, H., Bazin, Dominique, Caceres, L., Crawford, H., Fallon, P., Gernhauser, R., Gibelin, J., Go, S., Grévy, S., Hinke, C., Hoffman, C.R., Hughes, R., Ideguchi, E., Jenkins, D., Kobayashi, N., Kondon, Y., Kruckeno, R., Bleis, T. Le, Lee, G., Matta, A., Michimas, S., Nakamura, T., Ota, S., Petri, M., Sako, T., Sakurai, H., Shimoura, S., Steiger, K., Takahashi, K., Takechi, M., Togano, Y., Winkler, R., Yoneda, K., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Center for Nuclear Study, University of Tokyo, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

http://www.cns.s.u-tokyo.ac.jp/archive/annual/ann12.pdf

Published
2014

185. In-beam $\gamma$-ray spectroscopy of 38,40,42Si

Author

Matsushita, M., Takeuchi, S., Aoi, N., Doornenbal, P., Lee, J., Li, K., Motobayashi, T., Scheit, H., Steppenbeck, D., Wang, H., Baba, H., Bazin, Dominique, Caceres, L., Crawford, H., Fallon, P., Gernhäuser, R., Gibelin, J., Go, S., Grévy, S., Hinke, C., R. Hoffman, C., Hughes, R., Ideguchi, E., Ieki, K., Jenkins, D., Kobayashi, N., Kondo, Y., Krücken, R., Le Bleis, T., Lee, G., Matta, A., Michimasa, S., Nakamura, T., Ota, S., Petri, M., Sako, T., Sakurai, H., Shimoura, S., Steiger, K., Takahashi, K., Takechi, M., Togano, Y., Winkler, R., Yoneda, K., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique 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), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

International audience

Published
2013
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186. 核子あたりsim 230MeVの30Neの一粒子ノックアウト反応から得られる減少因子の非対称度依存性

Author

Lee, J., Liu, H., Doornenbal, P., Kimura, Masaaki, Minomo, Kosho, Ogata, Kazuyuki, Utsuno, Yutaka, Aoi, Nori, Li, K., Matsushita, Masafumi, Scheit, H., Steppenbeck, D., Takeuchi, Satoshi, Wang, H., Baba, Hidetada, Ideguchi, Eiji, Kobayashi, Nobuyuki, Kondo, Yosuke, Michimasa, Shinichiro, Motobayashi, Toru, Sakurai, Hiroyoshi, Takechi, Maya, and Togano, Yasuhiro

Abstract

高速不安定核ビームのノックアウト反応は、不安定核の一粒子状態を調べるのによく用いられている反応である。しかし、ノックアウト反応から反応理論を通じて得られた分光学的因子は、殻模型などの核構造模型から得られるものに比べて一様に減少しており、その減少因子は核子の分離エネルギーに強く依存するという不思議な性質があることが知られている。そのメカニズムはまだ完全には理解されていない。従来の研究では、核子あたり約120MeV程度のビームを使って減少因子が測定されてきた。本研究では、理化学研究所にて、核子あたり200MeV以上のより高速なビームを用いて、$^{30}$Neからの一中性子および一陽子ノックアウト反応を調べた。そこで得られた減少因子を殻模型や反対性分子動力学による核構造計算を用いて導いたところ、従来研究と同様の減少因子があることがわかった。

Published
2016

187. Magnetic rotation and quasicollective structures in 58Fe: Influence of the νg9/2 orbital

Author

Zhang, S.Q., Zhao, P.W., Honma, M., Smith, J.F., Freeman, S.J., Deacon, A.N., Zhu, S., Peng, J., Tabor, S.L., Lister, C.J., Steppenbeck, D., Seweryniak, D., Varley, B.J., Janssens, R.V.F., Meng, J., Yang, Y.-C., Chowdhury, P., Sun, Y., Carpenter, M.P., Lauritsen, T., and Jin, H.

Abstract

The structure of 58Fe was investigated at Gammasphere using 48Ca(13 ,14C,xn) fusion-evaporation reactions at a beam energy of 130 MeV. The level scheme has been revised and extended to J∼17 and an excitation energy of 16.6 MeV. Regular band structures consisting of low-energy ΔJ=1 transitions have been observed at moderate spin (J∼8-15) and are candidates for magnetic rotational bands. Self-consistent tilted-axis-cranking calculations within a relativistic mean-field theory were applied to investigate these bands and were found to reproduce the experimental results well. In other parts of the level scheme, quasirotational bands composed of stretched-E2 transitions have been extended to high spin, and other new bands have been identified. Positive-parity experimental states were compared to predictions of the spherical shell model using the GXPF1A, KB3G, and FPD6 effective interactions in the fp model space. The projected shell model, with a deformed quasiparticle basis including the neutron νg9/2 orbital, was applied to interpret regular ΔJ=2 band structures that extend beyond the maximum spin available for π[(f7/2)-2]- ν[(p3/2f 5/2p1/2)4] configurations and exhibit features characteristic of rotational alignment. It is clear that the νg9/2 intruder orbital plays a crucial role in describing the quasirotational structures in this nucleus, even starting as low as J∼5.

Published
2012
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188. γ-ray spectroscopy of the odd-odd N=Z+2 deformed proton emitter 112Cs

Author

Freeman, S.J., Grint, A.N., Smith, J.F., Steppenbeck, D., Paul, E.S., Carpenter, M.P., Robinson, A.P., Davids, C.N., Zhu, S., Janssens, R.V.F., Chiara, C.J., Lauritsen, T., Lister, C.J., Deacon, A.N., Seweryniak, D., Wady, P.T., McGuirk, B.M., Hadinia, B., Petri, M., and Kay, B.P.

Abstract

Gamma-ray transitions have been observed in the proton-emitting N=Z+2 (Tz=1) isotope 112Cs. The transitions have been unambiguously assigned to 112Cs by correlation with the characteristic proton decay, using the method of recoil-decay tagging with mass selection. The measured proton-decay energy and half-life are Ep=810(5) keV and T1/2=470(50) μs, respectively, which are consistent with previous measurements. Five γ-ray transitions have been observed which appear to form a rotational sequence. The energy differences between excited states in the sequence are consistent with an assignment as the favored signature of the ν(h 11/2) π(h11/2) structure. Tentative evidence for fine structure in the 112Cs proton decay is also observed.

Published
2012
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189. Structural Evolution in the Neutron-Rich Nuclei Zr-106 and Zr-108

Author

Sumikama, T, Yoshinaga, K, Watanabe, H, Nishimura, S, Miyashita, Y, Yamaguchi, K, Sugimoto, K, Chiba, J, Li, Z, Baba, H, Berryman, JS, Blasi, N, Bracco, A, Camera, F, Doornenbal, P, Go, S, Hashimoto, T, Hayakawa, S, Hinke, C, Ideguchi, E, Isobe, T, Ito, Y, Jenkins, DG, Kawada, Y, Kobayashi, N, Kondo, Y, Kruecken, R, Kubono, S, Lorusso, G, Nakano, T, Kurata-Nishimura, M, Odahara, A, Ong, HJ, Ota, S, Podolyak, Z, Sakurai, H, Scheit, H, Steiger, K, Steppenbeck, D, Takano, S, Takashima, A, Tajiri, K, Teranishi, T, Wakabayashi, Y, Walker, PM, Wieland, O, and Yamaguchi, H

Published
2011

190. Single-particle and collective structures in Cr55 and V55

Author

Steppenbeck, D., Honma, M., Lauritsen, T., Freeman, S.J., Larabee, A., Robinson, A.P., Kondev, F.G., Xu, F.R., Janssens, R.V.F., Carpenter, M.P., Kozemczak, J., Zhu, S., Deacon, A.N., Lister, C.J., Yang, Y.-C., Sun, Y., Smith, J.F., Kay, B.P., Wang, X., Fornal, B., and Seweryniak, D.

Abstract

Excited states in V55 and Cr55 have been populated via pn and 2n evaporation channels, respectively, following the fusion of a Ca48 beam at 172 MeV with a Be9 target. Level schemes have been deduced for the two nuclides to excitation energies of 7467 (V55) and 12226 keV (Cr55), with spins of 27/2 + and 33/2+, respectively. Negative-parity states are compared with shell-model calculations using three different effective interactions in the full fp model space. Negative-parity levels of Cr55 are explained in terms of single-particle fp-shell configurations outside N=28 and N=32 cores. Positive-parity states in both isotopes show evidence for the involvement of neutron g9/2 configurations. In the case of Cr55, a quasirotational structure based on the 1/2+[440] Nilsson orbital is observed up to the terminating state. In V55, positive-parity states do not exhibit well-developed collective features, and the observation of octupole decays is an indication of their importance in transitions from neutron g 9/2 configurations to the fp shell. Experimental results are compared with the predictions of a traditional shell model, the projected shell model, and total-Routhian-surface calculations.

Published
2011
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191. Investigating nuclear shell structure in the vicinity ofNi78: Low-lying excited states in the neutron-rich isotopesZn80,82

Author

Shiga, Y., primary, Yoneda, K., additional, Steppenbeck, D., additional, Aoi, N., additional, Doornenbal, P., additional, Lee, J., additional, Liu, H., additional, Matsushita, M., additional, Takeuchi, S., additional, Wang, H., additional, Baba, H., additional, Bednarczyk, P., additional, Dombradi, Zs., additional, Fulop, Zs., additional, Go, S., additional, Hashimoto, T., additional, Honma, M., additional, Ideguchi, E., additional, Ieki, K., additional, Kobayashi, K., additional, Kondo, Y., additional, Minakata, R., additional, Motobayashi, T., additional, Nishimura, D., additional, Otsuka, T., additional, Otsu, H., additional, Sakurai, H., additional, Shimizu, N., additional, Sohler, D., additional, Sun, Y., additional, Tamii, A., additional, Tanaka, R., additional, Tian, Z., additional, Tsunoda, Y., additional, Vajta, Zs., additional, Yamamoto, T., additional, Yang, X., additional, Yang, Z., additional, Ye, Y., additional, Yokoyama, R., additional, and Zenihiro, J., additional

Published
2016
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192. Neutron-driven collectivity in light tin isotopes: Proton inelastic scattering from 104Sn

Author

Hungarian Scientific Research Fund, Ministerio de Ciencia e Innovación (España), European Research Council, European Commission, SCOAP, Corsi, A., Boissinot, S., Obertelli, A., Doornenbal, P., Dupuis, M., Lechaftois, F., Matsushita, M., Péru, S., Takeuchi, S., Wang, H., Aoi, N., Baba, H., Bednarczyk, P., Ciemala, M., Gillibert, A., Isobe, T., Jungclaus, Andrea, Lapoux, V., Lee, J., Martini, M., Matsui, K., Motobayashi, T., Nishimura, D., Ota, S., Pollacco, E., Sakurai, H., Santamaria, C., Shiga, Y., Sohler, D., Steppenbeck, D., Taniuchi, R., Hungarian Scientific Research Fund, Ministerio de Ciencia e Innovación (España), European Research Council, European Commission, SCOAP, Corsi, A., Boissinot, S., Obertelli, A., Doornenbal, P., Dupuis, M., Lechaftois, F., Matsushita, M., Péru, S., Takeuchi, S., Wang, H., Aoi, N., Baba, H., Bednarczyk, P., Ciemala, M., Gillibert, A., Isobe, T., Jungclaus, Andrea, Lapoux, V., Lee, J., Martini, M., Matsui, K., Motobayashi, T., Nishimura, D., Ota, S., Pollacco, E., Sakurai, H., Santamaria, C., Shiga, Y., Sohler, D., Steppenbeck, D., and Taniuchi, R.

Abstract

© 2015 The Authors. Inelastic scattering cross sections to individual bound excited states of 104Sn were measured at 150 MeV/u beam energy and analyzed to evaluate the contribution of neutron and proton collectivity. State-of-the-art Quasi-Particle Random Phase Approximation (QRPA) with the D1M Gogny interaction reproduces the experimental proton collectivity and our inelastic scattering cross sections once used as input for a reaction calculation together with the Jeukenne-Lejeune-Mahaux (JLM) potentials. Experimental inelastic scattering cross section decreases by 40(24)% from 112Sn to 104Sn. The present work shows that (i) proton and neutron collectivities are proportional over a large range of tin isotopes (including 104Sn), as is typical for isoscalar excitations, and (ii) the neutron collectivity dominates. It suggests that the plateau in the mass range A=106-112 displayed by E2 transition probabilities is driven by neutron collectivity.

Published
2015

193. β-decay half-lives of very neutron-rich Kr to Tc isotopes on the boundary of the r-process path: an indication of fast r-matter flow

Author

Nishimura, S, Li, Z, Watanabe, H, Yoshinaga, K, Sumikama, T, Tachibana, T, Yamaguchi, K, Kurata-Nishimura, M, Lorusso, G, Miyashita, Y, Odahara, A, Baba, H, Berryman, JS, Blasi, N, Bracco, A, Camera, F, Chiba, J, Doornenbal, P, Go, S, Hashimoto, T, Hayakawa, S, Hinke, C, Ideguchi, E, Isobe, T, Ito, Y, Jenkins, DG, Kawada, Y, Kobayashi, N, Kondo, Y, Krücken, R, Kubono, S, Nakano, T, Ong, HJ, Ota, S, Podolyák, Z, Sakurai, H, Scheit, H, Steiger, K, Steppenbeck, D, Sugimoto, K, Takano, S, Takashima, A, Tajiri, K, Teranishi, T, Wakabayashi, Y, Walker, PM, Wieland, O, and Yamaguchi, H

Abstract

The β-decay half-lives of 38 neutron-rich isotopes from (36)Kr to (43)Tc have been measured; the half-lives of (100)Kr, (103-105)Sr, (106-108)Y, (108-110)Zr, (111,112)Nb, (112-115)Mo, and (116,117)Tc are reported here. The results when compared with previous standard models indicate an overestimation in the predicted half-lives by a factor of 2 or more in the A≈110 region. A revised model based on the second generation gross theory of β decay better predicts the measured half-lives and suggests a more rapid flow of the rapid neutron-capture process (r-matter flow) through this region than previously predicted.

Published
2010

194. Extension of theN=40Island of Inversion towardsN=50: Spectroscopy ofCr66,Fe70,72

Author

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

Published
2015
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195. Single-Neutron Knockout Reaction from 30Ne

Author

Liu, H., primary, Lee, J., additional, Doornenbal, P., additional, Scheit, H., additional, Takeuchi, S., additional, Aoi, N., additional, Li, K., additional, Matsushita, M., additional, Steppenbeck, D., additional, Wang, H., additional, Baba, H., additional, Ideguchi, E., additional, Kobayashi, N., additional, Kondo, Y., additional, Lee, G., additional, Michimasa, S., additional, Motobayashi, T., additional, Sakurai, H., additional, Takechi, M., additional, Togano, Y., additional, Tostevin, J. A., additional, and Utsuno, Y., additional

Published
2015
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196. Low-Lying Structure ofAr50and theN=32Subshell Closure

Author

Steppenbeck, D., primary, Takeuchi, S., additional, Aoi, N., additional, Doornenbal, P., additional, Matsushita, M., additional, Wang, H., additional, Utsuno, Y., additional, Baba, H., additional, Go, S., additional, Lee, J., additional, Matsui, K., additional, Michimasa, S., additional, Motobayashi, T., additional, Nishimura, D., additional, Otsuka, T., additional, Sakurai, H., additional, Shiga, Y., additional, Shimizu, N., additional, Söderström, P.-A., additional, Sumikama, T., additional, Taniuchi, R., additional, Valiente-Dobón, J. J., additional, and Yoneda, K., additional

Published
2015
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197. Neutron-driven collectivity in light tin isotopes: Proton inelastic scattering from 104Sn

Author

Corsi, A., primary, Boissinot, S., additional, Obertelli, A., additional, Doornenbal, P., additional, Dupuis, M., additional, Lechaftois, F., additional, Matsushita, M., additional, Péru, S., additional, Takeuchi, S., additional, Wang, H., additional, Aoi, N., additional, Baba, H., additional, Bednarczyk, P., additional, Ciemala, M., additional, Gillibert, A., additional, Isobe, T., additional, Jungclaus, A., additional, Lapoux, V., additional, Lee, J., additional, Martini, M., additional, Matsui, K., additional, Motobayashi, T., additional, Nishimura, D., additional, Ota, S., additional, Pollacco, E., additional, Sakurai, H., additional, Santamaria, C., additional, Shiga, Y., additional, Sohler, D., additional, Steppenbeck, D., additional, and Taniuchi, R., additional

Published
2015
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198. Lifetime measurements of excited states in neutron-rich Ar-44,Ar-46 populated via a multinucleon transfer reaction

Author

Mengoni, Daniele, VALIENTE DOBON, J. J., Gadea, A, Lunardi, Santo, Lenzi, SILVIA MONICA, Broda, R, Dewald, A, Pissulla, T, Angus, L. J., Aydin, S, Bazzacco, D, Benzoni, G, Bizzeti, P. G., BIZZETI SONA, A. M., Boutachkov, P, Corradi, L, Crespi, F, DE ANGELIS, G, Farnea, E, Fioretto, E, Goergen, A, Gorska, M, Gottardo, Andrea, Grodner, E, Howard, A. M., Krolas, W, Leoni, S, Mason, P, Montanari, Daniele, Montagnoli, Giovanna, Napoli, D. R., Obertelli, A, Orlandi, R, Pawlat, T, Pollarolo, G, Recchia, Francesco, Algora, A, Rubio, B, Sahin, E, Scarlassara, Fernando, Silvestri, R, Smith, J. F., Stefanini, A. M., Steppenbeck, D, Szilner, S, C. A., Ur, Wady, P. T., and Wrzesinski, J.

Published
2010

199. High-spin structures in the neutron-rich isotopes Mn57-60

Author

Lister, C.J., Steppenbeck, D., Seweryniak, D., Zhu, S., Honma, M., Deacon, A.N., Carpenter, M.P., Lauritsen, T., Varley, B.J., Smith, J.F., Freeman, S.J., Tabor, S.L., Janssens, R.V.F., and Chowdhury, P.

Abstract

Excited states in the neutron-rich isotopes Mn57-60 have been studied with fusion-evaporation reactions induced by Ca48 beams at 130 MeV on C13,14 targets. Level schemes have been deduced reaching spins of ∼16□ and ∼27□/2 in the odd-odd and odd-even isotopes, respectively. States with natural parity within an fp model space are compared to the predictions of large-scale shell-model calculations using the recently developed GXPF1A effective interaction. Quasirotational structures are evident in all of the isotopes and are discussed in terms of the deformation-driving potential of the ν1g9/2 intruder orbital. It is apparent that an enlarged model space, incorporating at least the 1g9/2 intruder state, is necessary to reproduce the observed experimental systematics in a more satisfactory manner.

Published
2010
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200. Lifetime measurements of excited states in neutron-rich 44, 46Ar populated via a multinucleon transfer reaction

Author

Mengoni, Daniele, Valiente-Dobon, J.J., Gadea, A., Lunardi, Santo, Lenzi, S.M., Broda, R., Dewald, A., Pissulla, T., Angus, L.J., Aydin, S., Bazzacco, D., Benzoni, G., Bizzeti, P.G., Bizzeti-Sona, A.M., Boutachkov, P., Corradi, Lorenzo, Crespi, F., de Angelis, G., Farnea, E., Fioretto, E., Goergen, A., Gorska, Magda, Gottardo, A., Grodner, E., Howard, A.M., Krolas, W., Leoni, S., Mason, P., Montanari, D., Montagnoli, G., Napoli, D.R., Obertelli, A., Orlandi, R., Pawlat, T., Pollarolo, G., Recchia, F., Algora, A., Rubio, B., Sahin, Eda, Scarlassara, F., Silvestri, R., Smith, J.F., Stefanini, A.M., Steppenbeck, D., Szilner, Suzana, Ur, C.A., Wady, P.T., and Wrzesinski, J.

Subjects
Nuclear Theory, multinucleon transfer reactions, the differential recoil distance Doppler shift method, lifetimes, shell-model calculations
Abstract

Lifetimes of low-lying excited states of the neutron-rich 44, 46Ar nuclei, populated via multinucleon transfer reactions, are measured by means of the differential recoil distance Doppler shift method. The extracted electromagnetic transition probabilities are compared with previous intermediate-energy Coulomb-excitation measurements and with large-scale shell-model calculations. The increase in the deduced B(E2 ; 2+→0+) transition probability from 44Ar to the closed-shell nucleus 46Ar contradicts the earlier results of Coulomb-excitation experiments. Shell-model calculations using different effective interactions agree with the new measured values.

Published
2010
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