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10 results on '"Jan Taprogge"'

1. Proton Shell Evolution below Sn132 : First Measurement of Low-Lying β -Emitting Isomers in Ag123,125

Author

Shudong Zhang, Naoki Fukuda, Zs. Podolyák, Shunji Nishimura, Yan-Lin Ye, T. Isobe, C. Y. Niu, Hiroki Nishibata, Xiaocan Li, Jin Wu, Ziyang Chen, Y. Jin, Toshiyuki Kubo, K. Moschner, D.X. Jiang, H.K. Wang, K. Yoshinaga, Chenyuan Li, K. Y. Chae, Jian-Ling Lou, Da Luo, G. Benzoni, A. Jungclaus, Hirofumi Watanabe, Ayumi Yagi, N. Kurz, Hiroshi Suzuki, I. Kojouharov, Hiroyoshi Sakurai, Atsuko Odahara, G. D. Kim, Young-Ki Kim, H. Y. Wu, Younghun Kwon, A. Montaner-Pizá, H. Baba, Roman Gernhäuser, G. J. Lane, Giuseppe Lorusso, Zhengyu Xu, Toshiyuki Sumikama, Hiroyuki Takeda, C. Xu, Naohito Inabe, Anna Wendt, Zs. Vajta, H. Schaffner, F. C. L. Crespi, Gary Simpson, F. G. Kondev, C. G. Wu, Z. H. Li, F. Naqvi, D. Kameda, P. A. Söderström, P. Doornenbal, K. Steiger, X. Wang, Zena Patel, F. Browne, H. S. Jung, Cenxi Yuan, Megumi Niikura, Jan Taprogge, Guillaume Gey, R. Orlandi, C. G. Wang, and Hui Hua

Subjects
Physics, Atomic orbital, Isotope, 0103 physical sciences, Magnetic monopole, General Physics and Astronomy, Atomic physics, 010306 general physics, Spectroscopy, 7. Clean energy, 01 natural sciences
Abstract

The β-delayed γ-ray spectroscopy of neutron-rich 123;125Ag isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN and the long-predicted 1/2¯ β-emitting isomers in 123;125Ag are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2¯ levels is extended in Ag isotopes up to N = 78, providing a clear signal for the reduction of the Z = 40 subshell gap in Ag towards N = 82. Shellmodel calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in 123;125Ag. The tensor force is found to play a crucial role in the evolution of the size of the Z = 40 subshell gap. The observed inversion of the single particle levels around 123Ag can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ʋ1h11/2 orbitals.

Published
2019
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2. Shell Evolution towards Ni78 : Low-Lying States in Cu77

Author

Hirofumi Watanabe, Atsuko Odahara, Giuseppe Lorusso, D. Mengoni, Megumi Niikura, K. Matsui, Tomio Kubo, H. Schaffner, Zs. Vajta, I. Stefan, F. Browne, Takaharu Otsuka, Toshiyuki Sumikama, Z. H. Li, I. Kojouharov, M.-C. Delattre, D. Suzuki, Shin-Ichiro Nishimura, Hiroki Nishibata, G. de Angelis, K. Yoshinaga, T. Isobe, Dóra Sohler, Ryo Taniuchi, G. Gey, P. Morfouace, I. Matea, Yusuke Tsunoda, S. Franchoo, K. Hadyńska-Klȩk, H. S. Jung, Jan Taprogge, Zhengyu Xu, Hiroyoshi Sakurai, D. R. Napoli, V. Werner, Andreas Görgen, M. Yalcinkaya, Ayumi Yagi, E. Sahin, P. R. John, F. L. Bello Garrote, P. Doornenbal, P. A. Söderström, F. Naqvi, H. Baba, Jinguang Wu, and N. Kurz

Subjects
Physics, 010308 nuclear & particles physics, Fission, Center (category theory), Shell (structure), General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Ion, Excited state, 0103 physical sciences, Cluster (physics), Level structure, Atomic physics, 010306 general physics, Spectroscopy
Abstract

The level structure of the neutron-rich ^{77}Cu nucleus is investigated through β-delayed γ-ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of ^{77}Ni are produced by in-flight fission, separated and identified in the BigRIPS fragment separator, and implanted in the WAS3ABi silicon detector array, surrounded by Ge cluster detectors of the EURICA array. A large number of excited states in ^{77}Cu are identified for the first time by correlating γ rays with the β decay of ^{77}Ni, and a level scheme is constructed by utilizing their coincidence relationships. The good agreement between large-scale Monte Carlo shell model calculations and experimental results allows for the evaluation of the single-particle structure near ^{78}Ni and suggests a single-particle nature for both the 5/2_{1}^{-} and 3/2_{1}^{-} states in ^{77}Cu, leading to doubly magic ^{78}Ni.

Published
2017
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3. β-Decay Half-Lives of 110 Neutron-Rich Nuclei across theN=82Shell Gap: Implications for the Mechanism and Universality of the AstrophysicalrProcess

Author

H. Baba, Toshiyuki Kubo, Megumi Niikura, Zena Patel, Shunji Nishimura, Hiroki Nishibata, Atsuko Odahara, Hiroyoshi Sakurai, D. Kameda, Tadaaki Isobe, P. Schury, Naohiro Inabe, A. Jungclaus, Hyo Soon Jung, Anna Wendt, Pieter Doornenbal, G. D. Kim, Young-Ki Kim, Hiroshi Suzuki, Toshiyuki Sumikama, F. C. L. Crespi, Bradley S. Meyer, Roman Gernhäuser, Hiroyuki Takeda, K. Steiger, Younghun Kwon, A. Montaner-Pizá, Giuseppe Lorusso, F. G. Kondev, F. Browne, R. Orlandi, Y. Shimizu, P. A. Söderström, Zs. Vajta, Guillaume Gey, Ayumi Yagi, Jan Taprogge, Hiroshi Watanabe, Z. H. Li, Jin Wu, F. Naqvi, I. Kojouharov, G. Benzoni, K. Moschner, S. Shibagaki, Zhengyu Xu, Toshitaka Kajino, Gary Simpson, H. Schaffner, K. Yoshinaga, Gregory Lane, K. Y. Chae, Naoki Fukuda, Zs. Podolyák, and N. Kurz

Subjects
Nuclear physics, Physics, Stars, Isotope, Double beta decay, General Physics and Astronomy, r-process, Neutron, 7. Clean energy, Universality (dynamical systems)
Abstract

The $\ensuremath{\beta}$-decay half-lives of 110 neutron-rich isotopes of the elements from $_{37}\mathrm{Rb}$ to $_{50}\mathrm{Sn}$ were measured at the Radioactive Isotope Beam Factory. The 40 new half-lives follow robust systematics and highlight the persistence of shell effects. The new data have direct implications for $r$-process calculations and reinforce the notion that the second ($A\ensuremath{\approx}130$) and the rare-earth-element ($A\ensuremath{\approx}160$) abundance peaks may result from the freeze-out of an $(n,\ensuremath{\gamma})\ensuremath{\rightleftarrows}(\ensuremath{\gamma},n)$ equilibrium. In such an equilibrium, the new half-lives are important factors determining the abundance of rare-earth elements, and allow for a more reliable discussion of the $r$ process universality. It is anticipated that universality may not extend to the elements Sn, Sb, I, and Cs, making the detection of these elements in metal-poor stars of the utmost importance to determine the exact conditions of individual $r$-process events.

Published
2015
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4. Isomer Decay Spectroscopy ofSm164andGd166: Midshell Collectivity AroundN=100

Author

Naoki Fukuda, Zs. Podolyák, Tetsuro Komatsubara, Toshiyuki Kubo, G. Benzoni, Toshiyuki Sumikama, H. Schaffner, Masao Kobayashi, Pieter Doornenbal, István Kuti, Hiroki Nishibata, Q. D. Wu, Hiroyuki Takeda, Jin Wu, Zhengyu Xu, Shunji Nishimura, Mana Tanaka, Hiroyoshi Sakurai, Giuseppe Lorusso, A. Gottardo, Nori Aoi, Naohiro Inabe, Eiji Ideguchi, K. Kobayashi, Shin'ichiro Michimasa, Simon Rice, Ayumi Yagi, H. L. Liu, P. H. Regan, Z. H. Li, Jan Taprogge, N. Kurz, Pär-Anders Söderström, L. Sinclair, F. L. Bello Garrote, I. Nishizuka, Y. F. Fang, Gary Simpson, D. Kameda, F. Browne, E. Sahin, I. Kojouharov, Hiroshi Watanabe, Guillaume Gey, H. Baba, Tadaaki Isobe, Chang-Bum Moon, Furong Xu, Hiroshi Suzuki, Zs. Vajta, Rin Yokoyama, Atsuko Odahara, R. Daido, Shintaro Go, Zena Patel, Philip M Walker, and Masafumi Matsushita

Subjects
Physics, Nuclear physics, Excited state, Potential energy surface, General Physics and Astronomy, Parity (physics), Observable, Atomic physics, Spectroscopy, Nuclear shape, Ionizing radiation
Abstract

Excited states in the N=102 isotones 166Gd and 164Sm have been observed following isomeric decay for the first time at RIBF, RIKEN. The half-lives of the isomeric states have been measured to be 950(60) and 600(140) ns for 166Gd and 164Sm, respectively. Based on the decay patterns and potential energy surface calculations, including β6 deformation, a spin and parity of 6- has been assigned to the isomeric states in both nuclei. Collective observables are discussed in light of the systematics of the region, giving insight into nuclear shape evolution. The decrease in the ground-band energies of 166Gd and 164Sm (N=102) compared to 164Gd and 162Sm (N=100), respectively, presents evidence for the predicted deformed shell closure at N=100.

Published
2014
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5. Yrast 6+Seniority Isomers of136,138Sn

Author

Hiroyoshi Sakurai, Shunji Nishimura, D. Mücher, Atsuko Odahara, Naohiro Inabe, Toshiyuki Sumikama, Zs. Vajta, J. M. Daugas, H. Naïdja, Hiroyuki Takeda, T. Kröll, I. Kojouharov, G. D. Kim, Giuseppe Lorusso, K. Steiger, F. Drouet, Pieter Doornenbal, Zhengyu Xu, Young-Ki Kim, R. Orlandi, Y. Shimizu, Younghun Kwon, Ayumi Yagi, Toshiyuki Kubo, A. Montaner-Pizá, Anna Wendt, K. Yoshinaga, Jin Wu, F. Browne, G. S. Simpson, Jan Taprogge, D. Kameda, H. Baba, K. Moschner, Tadaaki Isobe, Hiroki Nishibata, S. Ilieva, Guillaume Gey, H. Schaffner, Z. H. Li, A. Jungclaus, N. Kurz, Pär-Anders Söderström, Hyo Soon Jung, Naoki Fukuda, Hiroshi Suzuki, Roman Gernhäuser, S. Bönig, Hiroshi Watanabe, F. Nowacki, and Kamila Sieja

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Fission, Yrast, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Matrix (mathematics), Seniority (financial), Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in the very neutron-rich, semimagic isotopes (136,138)Sn have been observed following the projectile fission of a ²³⁸U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f(7/2) neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the B(E2;6⁺→4⁺) rate of ¹³⁶Sn, which deviates from a simple seniority scheme. Empirically reducing the νf(7/2)(2) orbit matrix elements produces a 4₁⁺ state with almost equal seniority 2 and 4 components, correctly reproducing the experimental B(E2;6⁺→4⁺) rate of ¹³⁶Sn. These data provide a key benchmark for shell-model interactions far from stability.

Published
2014
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6. Erratum:1p3/2Proton-Hole State inSn132and the Shell Structure AlongN=82[Phys. Rev. Lett. 112, 132501 (2014)]

Author

H. Baba, Zhengyu Xu, Young-Ki Kim, J. M. Daugas, A. Jungclaus, G. J. Lane, Giuseppe Lorusso, Z. H. Li, D. Kameda, H. Schaffner, Younghun Kwon, A. Montaner-Pizá, T. Kröll, K. Y. Chae, Shunji Nishimura, Atsuko Odahara, Hiroyoshi Sakurai, Jinguang Wu, F. G. Kondev, Hiroshi Suzuki, I. Kojouharov, P. Doornenbal, Toshiyuki Kubo, T. Isobe, H. Grawe, N. Kurz, Ayumi Yagi, Naohito Inabe, S. Bönig, Hiroshi Watanabe, F. Drouet, F. Naqvi, G. D. Kim, Naoki Fukuda, Zs. Podolyák, Megumi Niikura, Hiroki Nishibata, K. Steiger, L. Coraggio, K. Moschner, G. Benzoni, Toshiyuki Sumikama, Hiroyuki Takeda, F. Browne, A. Gadea, Guillaume Gey, P. A. Söderström, Anna Wendt, S. Ilieva, Jan Taprogge, Roman Gernhäuser, Hyo Soon Jung, D. Mücher, R. Orlandi, A. Covello, Gary Simpson, K. Yoshinaga, Z. Patel, A. Gargano, and Zs. Vajta

Subjects
Physics, Proton, Double beta decay, SHELL model, General Physics and Astronomy, State (functional analysis), Atomic physics, Beta decay
Published
2014
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7. β -Decay Half-Lives of Co76,77 , Ni79,80 , and Cu81 : Experimental Indication of a Doubly Magic Ni78

Author

F. Browne, Guillaume Gey, I. Stefan, K. Matsui, Shunji Nishimura, Pär-Anders Söderström, H. S. Jung, Zhengyu Xu, E. Sahin, Jan Taprogge, Z. H. Li, H. Baba, H. Schaffner, Ryo Taniuchi, N. Kurz, Atsuko Odahara, Shigeru Kubono, Daisuke Suzuki, Pieter Doornenbal, P. Morfouace, Hiroyoshi Sakurai, Hiroshi Watanabe, I. Matea, K. Yoshinaga, Megumi Niikura, D. Mengoni, P. R. John, Hiroki Nishibata, Zs. Vajta, F. Naqvi, Ayumi Yagi, Jin Wu, I. Kojouharov, V. Werner, Tadaaki Isobe, Toshiyuki Sumikama, D. R. Napoli, Giuseppe Lorusso, and S. Franchoo

Subjects
Physics, Crystallography, 010308 nuclear & particles physics, Double beta decay, Neutron number, 0103 physical sciences, General Physics and Astronomy, Atomic number, MAGIC (telescope), 010306 general physics, 01 natural sciences
Abstract

The half-lives of 20 neutron-rich nuclei with $Z=27--30$ have been measured at the RIBF, including five new half-lives of $^{76}\mathrm{Co}(21.{7}_{\ensuremath{-}4.9}^{+6.5}\text{ }\text{ }\mathrm{ms})$, $^{77}\mathrm{Co}(13.{0}_{\ensuremath{-}4.3}^{+7.2}\text{ }\text{ }\mathrm{ms})$, $^{79}\mathrm{Ni}({43.0}_{\ensuremath{-}7.5}^{+8.6}\text{ }\text{ }\mathrm{ms})$, $^{80}\mathrm{Ni}(23.{9}_{\ensuremath{-}17.2}^{+26.0}\text{ }\text{ }\mathrm{ms})$, and $^{81}\mathrm{Cu}(73.2\ifmmode\pm\else\textpm\fi{}6.8\text{ }\text{ }\mathrm{ms})$. In addition, the half-lives of $^{73--75}\mathrm{Co}$, $^{74--78}\mathrm{Ni}$, $^{78--80}\mathrm{Cu}$, and $^{80--82}\mathrm{Zn}$ were determined with higher precision than previous works. Based on these new results, a systematic study of the $\ensuremath{\beta}$-decay half-lives has been carried out, which suggests a sizable magicity for both the proton number $Z=28$ and the neutron number $N=50$ in $^{78}\mathrm{Ni}$.

Published
2014
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8. 1p3/2Proton-Hole State inSn132and the Shell Structure AlongN=82

Author

T. Kröll, I. Kojouharov, Shunji Nishimura, Zs. Vajta, F. G. Kondev, Naohiro Inabe, F. Drouet, Jan Taprogge, H. Schaffner, Roman Gernhäuser, Pär-Anders Söderström, D. Mücher, Atsuko Odahara, A. Gadea, H. Baba, Toshiyuki Sumikama, L. Coraggio, Megumi Niikura, Pieter Doornenbal, Tadaaki Isobe, Ayumi Yagi, K. Y. Chae, Gary Simpson, F. Naqvi, Z. H. Li, A. Jungclaus, S. Bönig, Hiroyoshi Sakurai, Toshiyuki Kubo, A. Covello, G. D. Kim, Hiroyuki Takeda, Hiroshi Watanabe, Hiroshi Suzuki, Hiroki Nishibata, J. M. Daugas, Young-Ki Kim, K. Yoshinaga, K. Moschner, G. J. Lane, Giuseppe Lorusso, Younghun Kwon, D. Kameda, A. Montaner-Pizá, H. Grawe, Zena Patel, Hyo Soon Jung, N. Kurz, Jin Wu, A. Gargano, Zhengyu Xu, F. Browne, G. Benzoni, K. Steiger, Zs. Podolyák, Guillaume Gey, Anna Wendt, N. Fukuda, S. Ilieva, and R. Orlandi

Subjects
Physics, Nuclear physics, Proton, Double beta decay, SHELL model, General Physics and Astronomy, State (functional analysis), Engineering physics, Beta decay
Abstract

5 pags. ; 3 figs. ; PACS numbers: 23.40.-s, 21.10.Pc, 27.60.+j, 21.60.Cs ; Taprogge, J., et al.

Published
2014
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9. Isomers inPd128andPd126: Evidence for a Robust Shell Closure at the Neutron Magic Number 82 in Exotic Palladium Isotopes

Author

F. Browne, Shunji Nishimura, Guillaume Gey, Atsuko Odahara, Pieter Doornenbal, Naohiro Inabe, Pär-Anders Söderström, Hiroki Nishibata, Ayumi Yagi, I. Kojouharov, Roman Gernhäuser, F. C. L. Crespi, Daiki Nishimura, Jan Taprogge, K. Moschner, F. G. Kondev, H. Schaffner, H. S. Jung, Toshiyuki Kubo, F. Naqvi, G. Benzoni, Hiroyoshi Sakurai, Zs. Vajta, Zhengyu Xu, Zhenping Li, Anna Wendt, N. Fukuda, K. Yoshinaga, R. Orlandi, Zena Patel, D. Kameda, Gary Simpson, K. Steiger, G. J. Lane, Giuseppe Lorusso, Tadaaki Isobe, Chang-Bum Moon, A. Jungclaus, Hiroshi Suzuki, G. D. Kim, Toshiyuki Sumikama, Young-Ki Kim, Hiroyuki Takeda, Younghun Kwon, A. Montaner-Pizá, Jin Wu, Hiroshi Watanabe, H. Baba, Zs. Podolyák, N. Kurz, M. Niikura, and K. Y. Chae

Subjects
Physics, 010308 nuclear & particles physics, Yrast, Isotone, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Magic number (programming), Isotopes of palladium, Neutron number, 0103 physical sciences, Quadrupole, Level structure, Neutron, Atomic physics, 010306 general physics
Abstract

The level structures of the very neutron-rich nuclei $^{128}\mathrm{Pd}$ and $^{126}\mathrm{Pd}$ have been investigated for the first time. In the $r$-process waiting-point nucleus $^{128}\mathrm{Pd}$, a new isomer with a half-life of $5.8(8)\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ is proposed to have a spin and parity of ${8}^{+}$ and is associated with a maximally aligned configuration arising from the ${g}_{9/2}$ proton subshell with seniority $\ensuremath{\upsilon}=2$. For $^{126}\mathrm{Pd}$, two new isomers have been identified with half-lives of 0.33(4) and $0.44(3)\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$. The yrast ${2}^{+}$ energy is much higher in $^{128}\mathrm{Pd}$ than in $^{126}\mathrm{Pd}$, while the level sequence below the ${8}^{+}$ isomer in $^{128}\mathrm{Pd}$ is similar to that in the $N=82$ isotone $^{130}\mathrm{Cd}$. The electric quadrupole transition that depopulates the ${8}^{+}$ isomer in $^{128}\mathrm{Pd}$ is more hindered than the corresponding transition in $^{130}\mathrm{Cd}$, as expected in the seniority scheme for a semimagic, spherical nucleus. These experimental findings indicate that the shell closure at the neutron number $N=82$ is fairly robust in the neutron-rich Pd isotopes.

Published
2013
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10. Coulomb Excitation ofSn104and the Strength of theSn100Shell Closure

Author

M. Górska, K. Moschner, H. J. Wollersheim, P. Reiter, Johan Nyberg, Alfredo Estrade, Robert Hoischen, B. S. Nara Singh, L. Scruton, F Schirru, A. Atac, Zs. Podolyák, J. Gerl, F. Nowacki, F. Ameil, Norbert Pietralla, Kjell Jansson, S. Pietri, F. Farinon, T. Habermann, Dirk Rudolph, C. Nociforo, Zs. Dombrádi, Anna Wendt, T. Arici, M. Pfützner, C. Domingo Pardo, Jan Taprogge, R. Wadsworth, N. Braun, Dóra Sohler, H. Grawe, D. Ralet, S. Brambilla, H. Schaffner, A. Blazhev, Oliver Wieland, E. Merchan, N. Lalović, N. Goel, N. Warr, Helmut Weick, J. S. Winfield, F. Camera, T. Swaleh, N. Kurz, G. Guastalla, A. Obertelli, I. Kojouharov, K. Sieja, Pavel Golubev, R. Knoebel, M. A. Bentley, P. Boutachkov, Alejandro Algora, Joakim Cederkäll, Rajesh Kumar, A. Prochazka, Zs. Vajta, J Kurcewicz, J. Grȩbosz, Douglas D. DiJulio, F. Naqvi, D. Bloor, A. Jungclaus, and J. Jolie

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, SHELL model, Nuclear structure, General Physics and Astronomy, Coulomb excitation, 7. Clean energy, 01 natural sciences, Key point, medicine.anatomical_structure, 13. Climate action, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleus, Excitation
Abstract

A measurement of the reduced transition probability for the excitation of the ground state to the first 2+ state in 104Sn has been performed using relativistic Coulomb excitation at GSI. 104Sn is the lightest isotope in the Sn chain for which this quantity has been measured. The result is a key point in the discussion of the evolution of nuclear structure in the proximity of the doubly magic nucleus 100Sn. The value B(E2; 0+ → 2+) = 0.10(4) e2b2 is significantly lower than earlier results for 106Sn and heavier isotopes. The result is well reproduced by shell model predictions and therefore indicates a robust N = Z = 50 shell closure.

Published
2013
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