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252 results on '"Vajta, Zs"'

1. Persistence of the ${Z=28}$ shell gap in ${A=75}$ isobars: Identification of a possible ${(1/2^-)}$ ${\mu}$s isomer in ${^{75}}$Co and ${\beta}$ decay to ${^{75}}$Ni

Author

Escrig, S., Morales, A. I., Nishimura, S., Niikura, M., Poves, A., Xu, Z. Y., Lorusso, G., Browne, F., Doornenbal, P., Gey, G., Jung, H. -S., Li, Z., Söderström, P. -A., Sumikama, T., Taprogge, J., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Baba, H., Franchoo, S., Isobe, T., John, P. R., Kojouharov, I., Kubono, S., Kurz, N., Matea, I., Matsui, K., Mengoni, D., Morfouace, P., Napoli, D. R., Naqvi, F., Nishibata, H., Odahara, A., Sahin, E., Sakurai, H., Schaffner, H., Stefan, I. G., Suzuki, D., Taniuchi, R., Werner, V., and Sohler, D.

Subjects
Nuclear Experiment
Abstract

Background: The evolution of shell structure around doubly magic exotic nuclei is of great interest in nuclear physics and astrophysics. In the `southwest' region of $^{78}$Ni, the development of deformation might trigger a major shift in our understanding of explosive nucleosynthesis. To this end, new spectroscopic information on key close-lying nuclei is very valuable. Purpose: We intend to measure the isomeric and $\beta$ decay of $^{75}$Co, with one-proton and two-neutron holes relative to $^{78}$Ni, to access new nuclear structure information in $^{75}$Co and its $\beta$-decay daughters $^{75}$Ni and $^{74}$Ni. Methods: The nucleus $^{75}$Co is produced in relativistic in-flight fission reactions of $^{238}$U at the Radioactive Ion Beam Factory in the RIKEN Nishina Center. Its isomeric and $\beta$ decay are studied exploiting the BigRIPS and EURICA setups. Results: We obtain partial $\beta$-decay spectra for $^{75}$Ni and $^{74}$Ni, and report a new isomeric transition in $^{75}$Co. The energy [$E_{\gamma}=1914(2)$ keV] and half-life [$t_{1/2}=13(6)$ $\mu$s] of the delayed $\gamma$ ray lend support for the existence of a $J^{\pi}=(1/2^-)$ isomeric state at 1914(2) keV. A comparison with PFSDG-U shell-model calculations provides a good account for the observed states in $^{75}$Ni, but the first calculated $1/2^-$ level in $^{75}$Co, a prolate $K=1/2$ state, is predicted about 1 MeV below the observed $(1/2^-)$ level. Conclusions: The spherical-like structure of the lowest-lying excited states in $^{75}$Ni is proved. In the case of $^{75}$Co, the results suggest that the dominance of the spherical configurations over the deformed ones might be stronger than expected below $^{78}$Ni. Further experimental efforts to discern the nature of the $J^{\pi}=(1/2^-)$ isomer are necessary., Comment: 15 pages, 6 figures, 3 tables. Physical Review C

Published
2021
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2. Is Seniority a Partial Dynamic Symmetry in the First $\nu g_{9/2}$ Shell?

Author

Morales, A. I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P. -A., Sumikama, T., Wu, J., Xu, Z. Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Garrote, F. L. Bello, Blasi, N., Bracco, A., Bruce, A. M., Camera, F., Ceruti, S., Crespi, F. C. L., Delattre, M. -C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D. R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P. H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Valiente-Dobón, J. J., Wieland, O., and Yalcinkaya, M.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The low-lying structures of the midshell $\nu g_{9/2}$ Ni isotopes $^{72}$Ni and $^{74}$Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following $\beta$ decay of the mother nuclei $^{72}$Co and $^{74}$Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first $(8^+)$ levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron $g_{9/2}$ shell. We find that the disappearance of the seniority isomerism in the $(8^+_1)$ states can be explained by a lowering of the seniority-four $(6^+)$ levels as predicted years ago. For $^{74}$Ni, the internal de-excitation pattern of the newly observed $(6^+_2)$ state supports a restoration of the normal seniority ordering up to spin $J=4$. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near $^{78}$Ni.

Published
2017
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3. Inelastic scattering of ⁷²,⁷⁴Ni off a proton target

Author

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

Abstract

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

Published
2024

4. $\gamma$ ray spectroscopy of $^{19}$C via single neutron knock-out reaction

Author

Vajta, Zs., Dombrádi, Zs., Elekes, Z., Aiba, T., Aoi, N., Baba, H., Bemmerer, D., Fülöp, Zs., Iwasa, N., Kiss, Á., Kobayashi, T., Kondo, Y., Motobayashi, T., Nakabayashi, T., Nannichi, T., Sakurai, H., Sohler, D., Takeuchi, S., Tanaka, K., Togano, Y., Yamada, K., Yamaguchi, M., and Yoneda, K.

Subjects
Nuclear Experiment
Abstract

The one neutron knock-out reaction $^1$H($^{20}$C,$^{19}$C$\gamma$) was studied at RIKEN using the DALI2 array. A $\gamma$ ray transition was observed at 198(10) keV. Based on the comparison between the experimental production cross section and theoretical predictions, the transition was assigned to the decay of the 3/2$_1^+$ state to the ground state., Comment: 5 pages, 3 figures, submitted in Physical Review C

Published
2015

5. Observation of Anomalous Internal Pair Creation in $^8$Be: A Possible Signature of a Light, Neutral Boson

Author

Krasznahorkay, A. J., Csatlós, M., Csige, L., Gácsi, Z., Gulyás, J., Hunyadi, M., Ketel, T. J., Krasznahorkay, A., Kuti, I., Nyakó, B. M., Stuhl, L., Timár, J., Tornyi, T. G., and Vajta, Zs.

Subjects
Nuclear Experiment
Abstract

Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV state ($J^\pi=1^+$, $T=1$) $\rightarrow$ ground state ($J^\pi=0^+$, $T=0$) and the isoscalar magnetic dipole 18.15 MeV ($J^\pi=1^+$, $T=0$) state $\rightarrow$ ground state transitions in $^{8}$Be. Significant deviation from the internal pair creation was observed at large angles in the angular correlation for the isoscalar transition with a confidence level of $> 5\sigma$. This observation might indicate that, in an intermediate step, a neutral isoscalar particle with a mass of 16.70$\pm0.35 $ (stat)$\pm 0.5 $ (sys) MeV$/c^2$ and $J^\pi = 1^+$ was created., Comment: 5 pages, 5 figures

Published
2015
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6. Nuclear structure studies of $^{24}$F

Author

Caceres, L., Lepailleur, A., Sorlin, O., Stanoiu, M., Sohler, D., Dombradi, Zs., Bogner, S. K., Brown, B. A., Hergert, H., Holt, J. D., Schwenk, A., Azaiez, F., Bastin, B., Borcea, C., Borcea, R., Bourgeois, C., Elekes, Z., Fülöp, Zs., Grévy, S., Gaudefroy, L., Grinyer, G. F., Guillemaud-Mueller, D., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., De Oliveira, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Thomas, J. C., Timar, J., Timis, C., and Vajta, Zs.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The structure of the $^{24}$F nucleus has been studied at GANIL using the $\beta$ decay of $^{24}$O and the in-beam $\gamma$-ray spectroscopy from the fragmentation of projectile nuclei. Combining these complementary experimental techniques, the level scheme of $^{24}$F has been constructed up to 3.6 Mev by means of particle-$\gamma$ and particle-$\gamma\gamma$ coincidence relations. Experimental results are compared to shell-model calculations using the standard USDA and USDB interactions as well as ab-initio valence-space Hamiltonians calculated from the in-medium similarity renormalization group based on chiral two- and three-nucleon forces. Both methods reproduce the measured level spacings well, and this close agreement allows unidentified spins and parities to be consistently assigned., Comment: 5 figures, 2 tables

Published
2015

7. Excited states in the neutron-rich nucleus 25F

Author

Vajta, Zs., Stanoiu, M., Sohler, D., Jansen, G. R., Azaiez, F., Dombrádi, Zs., Sorlin, O., Brown, B. A., Belleguic, M., Borcea, C., Bourgeois, C., Dlouhy, Z., Elekes, Z., ülöp, Zs. F, Grévy, S., Guillemaud-Mueller, D., Hagen, G., Hjorth-Jensen, M., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mandal, S., Mayet, P., Mrázek, J., Negoita, F., Penionzhkevich, Yu. -E., Podolyák, Zs., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Timár, J., Timis, C., and Yamamoto, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The structure of the nucleus 25F was investigated through in-beam {\gamma}-ray spectroscopy of the fragmentation of 26Ne and 27,28Na ion beams. Based on the particle-{\gamma} and particle-{\gamma}{\gamma} coincidence data, a level scheme was constructed and compared with shell model and coupled-cluster calculations. Some of the observed states were interpreted as quasi single-particle states built on top of the closed-shell nucleus 24O, while the others were described as states arising from coupling of a single proton to the 2+ core excitation of 24O., Comment: 8 pages, 4 figures and 1 table

Published
2014
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8. Collectivity evolution in the neutron-rich Pd isotopes towards the N=82 shell closure

Author

Wang, H., Aoi, N., Takeuchi, S., Matsushita, M., Doornenbal, P., Motobayashi, T., Steppenbeck, D., Yoneda, K., Baba, H., Caceres, L., Dombradi, Zs., Kobayashi, K., Kondo, Y., Lee, J., Li, K., Liu, H., Minakata, R., Nishimura, D., Otsu, H., Sakaguchi, S., Sakurai, H., Scheit, H., Sohler, D., Sun, Y., Tian, Z., Tanaka, R., Togano, Y., Vajta, Zs., Yang, Z., Yamamoto, T., Ye, Y., and Yokoyama, R.

Subjects
Nuclear Experiment
Abstract

The neutron-rich, even-even 122,124,126Pd isotopes has been studied via in-beam gamma-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory. Excited states at 499(9), 590(11), and 686(17) keV were found in the three isotopes, which we assign to the respective 2+ -> 0+ decays. In addition, a candidate for the 4+ state at 1164(20) keV was observed in 122Pd. The resulting Ex(2+) systematics are essentially similar to those of the Xe (Z=54) isotopic chain and theoretical prediction by IBM-2, suggesting no serious shell quenching in the Pd isotopes in the vicinity of N=82.

Published
2013
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9. Production of neutron-rich nuclei in the vicinity of 78Ni: Fragmentation reactions of unstable 81Ga and 82Ge beams

Author

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

Published
2024
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10. Nuclear structure study of 19,20,21N nuclei by gamma spectroscopy

Author

Elekes, Z., Vajta, Zs., Dombradi, Zs., Aiba, T., Aoi, N., Baba, H., Bemmerer, D., Fulop, Zs., Iwasa, N., Kiss, A., Kobayashi, T., Kondo, Y., Motobayashi, T., Nakabayashi, T., Nannichi, T., Sakurai, H., Sohler, D., Takeuchi, S., Tanaka, K., Togano, Y., Yamada, K., Yamaguchi, M., and Yoneda, K.

Subjects
Nuclear Experiment
Abstract

The structure of neutron rich nitrogen nuclei has been studied by use of neutron removal reaction and inelastic scattering. Mass and charge deformations have been deduced for the first excited state of 21N, which indicates the partial persitence of the N=14 subshell closure in nitrogen isotopes. The spectroscopic information obtained on the structure of 19,20,21N confirms the results from a previous experiment.

Published
2010
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11. Installation and commissioning of EURICA – Euroball-RIKEN Cluster Array

Author

Söderström, P.-A., Nishimura, S., Doornenbal, P., Lorusso, G., Sumikama, T., Watanabe, H., Xu, Z.Y., Baba, H., Browne, F., Go, S., Gey, G., Isobe, T., Jung, H.-S., Kim, G.D., Kim, Y.-K., Kojouharov, I., Kurz, N., Kwon, Y.K., Li, Z., Moschner, K., Nakao, T., Nishibata, H., Nishimura, M., Odahara, A., Sakurai, H., Schaffner, H., Shimoda, T., Taprogge, J., Vajta, Zs., Werner, V., Wu, J., Yagi, A., and Yoshinaga, K.

Published
2013
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12. Proton-hole and core-excited states in the semi-magic nucleus 131In82

Author

Taprogge, J., Jungclaus, A., Grawe, H., Borzov, I. N., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G. S., Söderström, P. -A., Sumikama, T., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bönig, S., Chae, K. Y., Coraggio, L., Daugas, J. -M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F. G., Kröll, T., Lane, G. J., Montaner-Pizá, A., Moschner, K., Mücher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., and Wendt, A.

Published
2016
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13. β-γ and isomeric decay spectroscopy of 168Dy

Author

Zhang G.X., Watanabe H., Kondev F.G., Lane G.J., Regan P.H., Söderström P.-A., Walker P.M., Kanaoka H., Korkulu Z., Lee P.S, Liu J.J, Nishimura S., Wu J., Yagi A., Ahn D.S., Alharbi T., Baba H., Browne F., Bruce A.M., Carroll R.J., Chae K.Y., Dombradi Zs., Doornenbal P., Estrade A., Fukuda N., Griffin C., Ideguchi E., Inabe N., Isobe T., Kanaya S., Kojouharov I., Kubo T., Kubono S., Kurz N., Kuti I., Lalkovski S., Lee C.S., Lee E.J., Lorusso G., Lotay G., Moon C.-B, Nishizuka I., Nita C.R., Odahara A., Patel Z., Phong V.H., Podolyák Zs., Roberts O.J., Sakurai H., Schaffner H., Shand C.M., Shimizu Y., Sumikama T., Suzuki H., Takeda H., Terashima S., Vajta Zs., Valiente-Dóbon J.J., and Xu Z.Y.

Subjects
Physics, QC1-999
Abstract

This contribution will report on the experimental work on the level structure of 168Dy. The experimental data have been taken as part of the EURICA decay spectroscopy campaign at RIBF, RIKEN in November 2014. In the experiment, a 238U primary beam is accelerated up to 345 MeV/u with an average intensity of 12 pnA. The nuclei of interest are produced by in-flight fission of 238U impinging on Be target with a thickness of 5 mm. The excited states of 168Dy have been populated through the decay from a newly identified isomeric state and via the β decay from 168Tb. In this contribution, scientific motivations, experimental procedure and some preliminary results for this study are presented.

Published
2018
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14. Impact of shell evolution on Gamow-Teller β decay from a high-spin long-lived isomer in 127Ag

Author

Watanabe, H., Yuan, C.X., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.-A., Doornenbal, P., Browne, F., Gey, G., Jung, H.S., Taprogge, J., Vajta, Zs., Wang, H.K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.-B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Published
2021
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15. Impact of shell evolution on Gamow-Teller Decay From a High-spin Long-lived Isomer in Ag

Author

Watanabe, H., Yuan, C.X., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.A., Doornenbal, P., Browne, F., Gey, G., Jung, H.S., Taprogge, J., Vajta, Zs., Wang, H.K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Abstract

The change of the shell structure in atomic nuclei, so-called “nuclear shell evolution”, occurs due to changes of major configurations through particle-hole excitations inside one nucleus, as well as due to variation of the number of constituent protons or neutrons. We have investigated how the shell evolution affects Gamow-Teller (GT) transitions that dominate the β decay in the region below $^{132}$Sn using the newly obtained experimental data on a long-lived isomer in $^{127}$Ag. The T1/2=67.5(9) ms isomer has been identified with a spin and parity of (27/2+) at an excitation energy of 1942−20+14 keV, and found to decay via an internal transition of an E3 character, which competes with the dominant β-decay branches towards the high-spin states in $^{127}$Cd. The underlying mechanism of a strong GT transition from the $^{127}$Ag isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach.

Published
2021

16. Isomer-delayed gamma-ray spectroscopy of neutron-rich 166Tb

Author

Gurgi L.A., Regan P.H., Söderström P.-A., Watanabe H., Walker P.M., Podolyák Zs., Nishimura S., Berry T.A., Doornenbal P., Lorusso G., Isobe T., Baba H., Xu Z.Y., Sakurai H., Sumikama T., Catford W.N., Bruce A.M., Browne F., Lane G.J., Kondev F.G., Odahara A., Wu J., Liu H.L., Xu F.R., Korkulu Z., Lee P., Liu J.J., Phong V.H., Yagi A., Zhang G.X., Alharbi T., Carroll R.J., Chae K.Y., Dombradi Zs., Estrade A., Fukuda N., Griffin C., Ideguchi E., Inabe N., Kanaoka H., Kojouharov I., Kubo T., Kubono S., Kurz N., Kuti I., Lalkovski S., Lee E.J., Lee C.S., Lotay G., Moon C.B., Nishizuka I., Nita C.R., Patel Z., Roberts O.J., Schaffner H., Shand C.M., Suzuki H., Takeda H., Terashima S., Vajta Zs., Kanaya S., and Valiente-Dobòn J.J.

Subjects
Physics, QC1-999
Abstract

This short paper presents the identification of a metastable, isomeric-state decay in the neutron-rich odd-odd, prolate-deformed nucleus 166Tb. The nucleus of interest was formed using the in-flight fission of a 345 MeV per nucleon 238U primary beam at the RIBF facility, RIKEN, Japan. Gamma-ray transitions decaying from the observed isomeric states in 166Tb were identified using the EURICA gamma-ray spectrometer, positioned at the final focus of the BigRIPS fragments separator. The current work identifies a single discrete gamma-ray transition of energy 119 keV which de-excites an isomeric state in 166Tb with a measured half-life of 3.5(4) μs. The multipolarity assignment for this transition is an electric dipole and is made on the basis internal conversion and decay lifetime arguments. Possible two quasi-particle Nilsson configurations for the initial and final states which are linked by this transition in 166Tb are made on the basis of comparison with Blocked BCS Nilsson calculations, with the predicted ground state configuration for this nucleus arising from the coupling of the v(1-/2)[521] and π(3+/2) Nilsson orbitals.

Published
2017
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17. Erratum to: Proton-hole and core-excited states in the semi-magic nucleus 131In82

Author

Taprogge, J., Jungclaus, A., Grawe, H., Borzov, I. N., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G. S., Söderström, P. -A., Sumikama, T., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bönig, S., Chae, K. Y., Coraggio, L., Daugas, J. -M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F. G., Kröll, T., Lane, G. J., Montaner-Pizá, A., Moschner, K., Mücher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., and Wendt, A.

Published
2016
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18. Three-quasiparticle isomers in odd-even Pm159,161 : Calling for modified spin-orbit interaction for the neutron-rich region

Author

Yokoyama, R., primary, Ideguchi, E., additional, Simpson, G. S., additional, Tanaka, Mn., additional, Sun, Yang, additional, Lv, Cui-Juan, additional, Liu, Yan-Xin, additional, Wang, Long-Jun, additional, Nishimura, S., additional, Doornenbal, P., additional, Lorusso, G., additional, Söderström, P.-A., additional, Sumikama, T., additional, Wu, J., additional, Xu, Z. Y., additional, Aoi, N., additional, Baba, H., additional, Bello Garrote, F. L., additional, Benzoni, G., additional, Browne, F., additional, Daido, R., additional, Fang, Y., additional, Fukuda, N., additional, Gottardo, A., additional, Gey, G., additional, Go, S., additional, Inabe, S., additional, Isobe, T., additional, Kameda, D., additional, Kobayashi, K., additional, Kobayashi, M., additional, Kojouharov, I., additional, Komatsubara, T., additional, Kubo, T., additional, Kurz, N., additional, Kuti, I., additional, Li, Z., additional, Matsushita, M., additional, Michimasa, S., additional, Moon, C. B., additional, Nishibata, H., additional, Nishizuka, I., additional, Odahara, A., additional, Patel, Z., additional, Rice, S., additional, Sahin, E., additional, Sakurai, H., additional, Schaffner, H., additional, Sinclair, L., additional, Suzuki, H., additional, Takeda, H., additional, Taprogge, J., additional, Vajta, Zs., additional, Watanabe, H., additional, and Yagi, A., additional

Published
2021
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19. Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2−) μs isomer in Co75 and β decay to Ni75

Author

Escrig, S., primary, Morales, A. I., additional, Nishimura, S., additional, Niikura, M., additional, Poves, A., additional, Xu, Z. Y., additional, Lorusso, G., additional, Browne, F., additional, Doornenbal, P., additional, Gey, G., additional, Jung, H.-S., additional, Li, Z., additional, Söderström, P.-A., additional, Sumikama, T., additional, Taprogge, J., additional, Vajta, Zs., additional, Watanabe, H., additional, Wu, J., additional, Yagi, A., additional, Yoshinaga, K., additional, Baba, H., additional, Franchoo, S., additional, Isobe, T., additional, John, P. R., additional, Kojouharov, I., additional, Kubono, S., additional, Kurz, N., additional, Matea, I., additional, Matsui, K., additional, Mengoni, D., additional, Morfouace, P., additional, Napoli, D. R., additional, Naqvi, F., additional, Nishibata, H., additional, Odahara, A., additional, Sahin, E., additional, Sakurai, H., additional, Schaffner, H., additional, Stefan, I. G., additional, Suzuki, D., additional, Taniuchi, R., additional, Werner, V., additional, and Sohler, D., additional

Published
2021
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20. Three-quasiparticle isomers in odd-even $^{159,161}\mathrm{Pm}$: Calling for modified spin-orbit interaction for the neutron-rich region

Author

Yokoyama, R., Ideguchi, E., Simpson, G.S., Tanaka, Mn., Sun, Yang, Lv, Cui-Juan, Liu, Yan-Xin, Wang, Long-Jun, Nishimura, S., Doornenbal, P., Lorusso, G., Söderström, P.-A., Sumikama, T., Wu, J., Xu, Z.Y., Aoi, N., Baba, H., Bello Garrote, F.L., Benzoni, G., Browne, F., Daido, R., Fang, Y., Fukuda, N., Gottardo, A., Gey, G., Go, S., Inabe, S., Isobe, T., Kameda, D., Kobayashi, K., Kobayashi, M., Kojouharov, I., Komatsubara, T., Kubo, T., Kurz, N., Kuti, I., Li, Z., Matsushita, M., Michimasa, S., Moon, C.B., Nishibata, H., Nishizuka, I., Odahara, A., Patel, Z., Rice, S., Sahin, E., Sakurai, H., Schaffner, H., Sinclair, L., Suzuki, H., Takeda, H., Taprogge, J., Vajta, Zs., Watanabe, H., Yagi, A., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), and ILL

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

International audience; Neutron-rich Pm (Z=61) isotopes were studied by delayed γ-ray spectroscopy at RIBF, RIKEN Nishina Center using the in-flight fission of a 345 MeV/nucleon U238 beam. A cluster-type Ge detector array, EURICA, was used to measure the delayed γ rays from stopped ions. Isomeric γ decays were observed in Pm159 and Pm161 with half-lives of 4.97(12) μs and 0.79(4) μs, respectively. Level schemes for Pm159 and Pm161 were constructed in this study. The isomeric states of Pm159 and Pm161 could be interpreted as two quasiparticle excitations of neutrons with the configurations of ν(7/2[633]⊗5/2[523]) and ν(7/2[633]⊗1/2[521]), respectively. They are analogous to the isomers that have been observed systematically in other even-mass N=98 and N=100 isotones in this region. A projected shell model calculation was performed and it reproduced the order of three-quasiparticle states only if new Nilsson parameters with an N-dependent spin-orbit interaction were used. This work demonstrates that the strength of spin-orbit interactions in standard Nilsson parameters needs to be modified to study the properties of neutron-rich rare-earth nuclei around A=165, and provides new evidence supporting the existence of the deformed N=98 subshell gap in odd-mass nuclei for the first time.

Published
2021

21. Three-quasiparticle isomers in odd-even Pm 159,161: Calling for modified spin-orbit interaction for the neutron-rich region

Author

Yokoyama, R., Ideguchi, E., Simpson, G. S., Tanaka, Mn, Sun, Yang, Lv, Cui Juan, Liu, Yan Xin, Wang, Long Jun, Nishimura, S., Doornenbal, P., Lorusso, G., Söderström, P. A., Sumikama, T., Wu, J., Xu, Z. Y., Aoi, N., Baba, H., Bello Garrote, F. L., Benzoni, G., Browne, F., Daido, R., Fang, Y., Fukuda, N., Gottardo, A., Gey, G., Go, S., Inabe, S., Isobe, T., Kameda, D., Kobayashi, K., Kobayashi, M., Kojouharov, I., Komatsubara, T., Kubo, T., Kurz, N., Kuti, I., Li, Z., Matsushita, M., Michimasa, S., Moon, C.B., Nishibata, H., Nishizuka, I., Odahara, A., Patel, Z., Rice, S., Sahin, E., Sakurai, H., Schaffner, H., Sinclair, L., Suzuki, H., Takeda, H., Taprogge, J., Vajta, Zs, Watanabe, H., Yagi, A., Japan Society for the Promotion of Science, RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministry of Education, Science and Technology (South Korea), National Research Foundation of Korea, Ministerio de Ciencia e Innovación (España), Hungarian Scientific Research Fund, National Natural Science Foundation of China, and National Key Research and Development Program (China)

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

7 pags., 5 figs., 1 tab., Neutron-rich Pm (Z=61) isotopes were studied by delayed γ-ray spectroscopy at RIBF, RIKEN Nishina Center using the in-flight fission of a 345 MeV/nucleon U238 beam. A cluster-type Ge detector array, EURICA, was used to measure the delayed γ rays from stopped ions. Isomeric γ decays were observed in Pm159 and Pm161 with half-lives of 4.97(12) μs and 0.79(4) μs, respectively. Level schemes for Pm159 and Pm161 were constructed in this study. The isomeric states of Pm159 and Pm161 could be interpreted as two quasiparticle excitations of neutrons with the configurations of ν(7/2[633] - 5/2[523]) and ν(7/2[633] - 1/2[521]), respectively. They are analogous to the isomers that have been observed systematically in other even-mass N=98 and N=100 isotones in this region. A projected shell model calculation was performed and it reproduced the order of three-quasiparticle states only if new Nilsson parameters with an N-dependent spin-orbit interaction were used. This work demonstrates that the strength of spin-orbit interactions in standard Nilsson parameters needs to be modified to study the properties of neutron-rich rare-earth nuclei around A=165, and provides new evidence supporting the existence of the deformed N=98 subshell gap in odd-mass nuclei for the first time., We acknowledge financial support from JSPS KAKENHI (Grants No. 17H06090, No. 25247045). This experiment was carried out at the RI Beam Factory operated by RIKEN, Nishina Center and CNS, the University of Tokyo. The authors are grateful to the RIBF accelerator crew for providing the U beam. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. Part of the WAS3ABi was supported by the Rare Isotope Science Project, which is funded by the Ministry of Education, Science and Technology (MEST) and the National Research Foundation (NRF) of Korea. This work was supported by the Spanish Ministerio de Ciencia e Innovación under Contracts No. FPA2009-13377-C02 and No. FPA2011-29854-C04 and the Hungarian Research Fund (OTKA), Contract No. K100835. The author R.Y. was supported by the ALPS program of the University of Tokyo and by a JSPS fellowship, No. JP15J10788. The theoretical work was partially supported by the National Natural Science Foundation of China (No. U1932206, No. U1832139, No. 11947410, No. 11905175, No. 11875225), and by the National Key Program for S&T Research and Development of China (No. 2016YFA0400501)

Published
2021

22. Impact of shell evolution on Gamow-Teller beta decay from a high-spin long-lived isomer in Ag-127

Author

Watanabe, H., Yuan, C. X., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Soderstrom, P-A, Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs, Wang, H. K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhauser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I, Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C-B, Montaner-Piza, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs, Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yoshinaga, K., Watanabe, H., Yuan, C. X., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Soderstrom, P-A, Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs, Wang, H. K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhauser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I, Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C-B, Montaner-Piza, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs, Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Abstract

The change of the shell structure in atomic nuclei, so-called nuclear shell evolution, occurs due to changes of major configurations through particle-hole excitations inside one nucleus, as well as due to variation of the number of constituent protons or neutrons. We have investigated how the shell evolution affects Gamow-Teller (GT) transitions that dominate the beta decay in the region below Sn-132 using the newly obtained experimental data on a long-lived isomer in Ag-127. The T-1/2 = 67.5(9) ms isomer has been identified with a spin and parity of (27/2(+)) at an excitation energy of 1942(-20)(+14) keV, and found to decay via an internal transition of an E3 character, which competes with the dominant beta-decay branches towards the high-spin states in Cd-127. The underlying mechanism of a strong GT transition from the Ag-127 isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach. (C) 2021 The Authors. Published by Elsevier B.V.

Published
2021

23. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

Moon, B., Jungclaus, A., Naidja, H., Gargano, A., Lozeva, R., Moon, C-B, Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Soderstrom, P-A, Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Garrote, F. L. Bello, Boenig, S., Daido, R., Daugas, J. M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhaeuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I, Komatsubara, T., Kroell, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Piza, A., Morimoto, S., Moschner, K., Muecher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I, Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., Yoshinaga, K., Moon, B., Jungclaus, A., Naidja, H., Gargano, A., Lozeva, R., Moon, C-B, Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Soderstrom, P-A, Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Garrote, F. L. Bello, Boenig, S., Daido, R., Daugas, J. M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhaeuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I, Komatsubara, T., Kroell, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Piza, A., Morimoto, S., Moschner, K., Muecher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I, Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., and Yoshinaga, K.

Abstract

Newly observed decay schemes of the nuclei Sb-137 and Sb-138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U-238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te-137 with tentatively assigned spin-parities of (5/2(-)), (9/2(-)), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N = 82. The study of the beta decay of Sb-138 led to a considerable extension of the level scheme of Te-138 including the identification of several nonyrast states. The structure of Te-137 and Te-138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions.

Published
2021

24. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Moon, B., Jungclaus, Andrea, Naïdja, H., Gargano, A., Lozeva, R., Moon, C.B., Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P. A., Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Bello Garrote, F. L., Bönig, S., Daido, R., Daugas, J.M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhäuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I., Komatsubara, T., Kröll, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Pizá, A., Morimoto, S., Moschner, K., Mücher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., Yoshinaga, K., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Moon, B., Jungclaus, Andrea, Naïdja, H., Gargano, A., Lozeva, R., Moon, C.B., Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P. A., Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Bello Garrote, F. L., Bönig, S., Daido, R., Daugas, J.M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhäuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I., Komatsubara, T., Kröll, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Pizá, A., Morimoto, S., Moschner, K., Mücher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., and Yoshinaga, K.

Abstract

Newly observed decay schemes of the nuclei Sb137 and Sb138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te137 with tentatively assigned spin-parities of (5/2-), (9/2-), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N=82. The study of the ß decay of Sb138 led to a considerable extension of the level scheme of Te138 including the identification of several nonyrast states. The structure of Te137 and Te138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions.

Published
2021

25. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

Moon, B., primary, Jungclaus, A., additional, Naïdja, H., additional, Gargano, A., additional, Lozeva, R., additional, Moon, C.-B., additional, Odahara, A., additional, Simpson, G. S., additional, Nishimura, S., additional, Browne, F., additional, Doornenbal, P., additional, Gey, G., additional, Keatings, J., additional, Lorusso, G., additional, Patel, Z., additional, Rice, S., additional, Si, M., additional, Sinclair, L., additional, Söderström, P.-A., additional, Sumikama, T., additional, Taprogge, J., additional, Watanabe, H., additional, Wu, J., additional, Xu, Z. Y., additional, Yagi, A., additional, Ahn, D. S., additional, Baba, H., additional, Bello Garrote, F. L., additional, Bönig, S., additional, Daido, R., additional, Daugas, J. M., additional, Didierjean, F., additional, Drouet, F., additional, Fang, Y., additional, Fukuda, N., additional, Gernhäuser, R., additional, Hong, B., additional, Ideguchi, E., additional, Ilieva, S., additional, Inabe, N., additional, Ishigaki, T., additional, Isobe, T., additional, Jung, H. S., additional, Kameda, D., additional, Kojouharov, I., additional, Komatsubara, T., additional, Kröll, T., additional, Kubo, T., additional, Kurz, N., additional, Kwon, Y. K., additional, Lee, C. S., additional, Lee, P., additional, Li, Z., additional, Montaner-Pizá, A., additional, Morimoto, S., additional, Moschner, K., additional, Mücher, D., additional, Murai, D., additional, Niikura, M., additional, Nishibata, H., additional, Nishizuka, I., additional, Orlandi, R., additional, Sakurai, H., additional, Schaffner, H., additional, Shimizu, Y., additional, Steiger, K., additional, Suzuki, H., additional, Takeda, H., additional, Tshoo, K., additional, Vajta, Zs., additional, Wendt, A., additional, Yokoyama, R., additional, and Yoshinaga, K., additional

Published
2021
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26. β-decay spectroscopy of neutron-rich 160,161,162Sm isotopes

Author

Patel Z., Podolyák Zs., Walker P. M., Regan P. H., Söderström P.-A., Watanabe H., Ideguchi E., Simpson G. S., Nishimura S., Browne F., Doornenbal P., Lorusso G., Rice S., Sinclair L., Sumikama T., Wu J., Xu Z. Y., Aoi N., Baba H., Bello Garrote F. L., Benzoni G., Daido R., Dombrádi Zs., Fang Y., Fukuda N., Gey G., Go S., Gottardo A., Inabe N., Isobe T., Kameda D., Kobayashi K., Kobayashi M., Komatsubara T., Kojouharov I., Kubo T., Kurz N., Kuti I., Li Z., Liu H. L, Matsushita M., Michimasa S., Moon C.-B., Nishizuka H., Nishizuka I., Odahara A., Şahin E., Sakurai H., Schaffner H., Suzuki H., Takeda H., Tanaka M., Taprogge J., Vajta Zs., Xu F. R., Yagi A., and Yokoyama R.

Subjects
Physics, QC1-999
Abstract

Neutron-rich 160,161,162Sm isotopes have been populated at the RIBF, RIKEN via β first time. β-coincident γ rays were observed in all three isotopes including γ rays from the isomeric decay of 160Sm and 162Sm. The isomers in 160Sm and 162Sm have previously been observed but have been populated via β decay for the first time. The isomeric state in 162Sm is assigned a 4−v72+[ 633 ]⊗v12−[ 521 ]${4^ - }v{{7 \over 2}^ + }\left[ {633} \right] \otimes v{{1 \over 2}^ - }\left[ {521} \right]$ configuration based on the decay pattern. The level schemes of 160Sm and 162Sm are presented. The ground states in the parent nuclei 160Pm and 162Pm are both assigned a 6−v72+[633]⊗π52−[532]${6^ - }v{{7 \over 2}^ + }\left[ {633} \right] \otimes \pi {{5 \over 2}^ - }\left[ {532} \right]$ configuration based on the population of states in the daughter nuclei. Blocked BCS calculations were performed to further investigate the spin-parities of the ground states in 160Pm, 161Pm, and 162Pm, and the isomeric state in 162Sm

Published
2016
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27. Collectivity of neutron-rich Cr and Fe toward N=50

Author

Werner V., Santamaria C., Louchart C., Obertelli A., 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 R., 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., and Xu Z.

Subjects
Physics, QC1-999
Abstract

Within the SEASTAR project at RIKEN-RIBF, 66Cr and 70,72Fe have been produced via protonknockout reactions, and their first excited 2+ and 4+ states have been discovered. The combination of the liquid-hydrogen target and TPC system MINOS has been used in combination with the DALI2 detector array for the first time. A 345 MeV/u 238U beam with a mean intensity of about 12 pnA impinged on a Be target. Fission fragments were separated and identified using the BigRIPS spectrograph, and reaction products were analyzed using the ZeroDegree spectrograph. A plateau of excitation energies, with a small change in the systematic trends past N = 44, reveals an extension of the N = 40 region of collectivity toward N = 50. Hence, the isotopes of interest are located within the N = 40 island of inversion. An interpretation of the observed trends is offered through large scale shell model calculations.

Published
2016
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28. $beta$ decay of $^75Ni$ and the systematics of the low-lying level structure of neutron-rich odd-$A$ Cu isotopes

Author

Bello Garrote, F. L., Sahin, E., Tsunoda, Y., Otsuka, T., Görgen, A., Niikura, M., Nishimura, S., de Angelis, G., Benzoni, G., Morales, A. I., Modamio, V., Xu, Z. Y., Baba, H., Browne, F., Bruce, A. M., Ceruti, S., Crespi, F. C. L., Daido, R., Delattre, M.-C., Doornenbal, P., Dombradi, Zs., Fang, Y., Franchoo, S., Gey, G., Gottardo, A., Hadyifmmode nelse ńska-Klifmmode ęelse ęk, K., Isobe, T., John, P. R., Jung, H. S., Kojouharov, I., Kubo, T., Kurz, N., Kuti, I., Li, Z., Lorusso, G., Matea, I., Matsui, K., Mengoni, D., Miyazaki, T., Momiyama, S., Morfouace, P., Napoli, D. R., Naqvi, F., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Rice, S., Sakurai, H., Schaffner, H., Sinclair, L., Söderström, P.-A., Sohler, D., Stefan, I. G., Sumikama, T., Suzuki, D., Taniuchi, R., Taprogge, J., Vajta, Zs., Valiente-Dobón, J. J., Watanabe, H., Werner, V., Wu, J., Yagi, A., Yalcinkaya, M., Yokoyama, R., and Yoshinaga, K.

Published
2020

29. Shell structure of the neutron-rich isotopes Co 69,71,73

Author

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

Subjects
Nuclear Experiment
Abstract

The structures of the neutron-rich Co69,71,73 isotopes were investigated via (p,2p) knockout reactions at the Radioactive Isotope Beam Factory, RIKEN. Isotopes of interest were studied using the DALI2 γ-ray detector array combined with the MINOS target and tracker system. Level schemes were reconstructed using the γ-γ coincidence technique, with tentative spin-parity assignments based on the measured inclusive and exclusive cross sections. Comparison with shell-model calculations using the Lenzi-Nowacki-Poves-Sieja LNPS and PFSDG-U interactions suggests coexistence of spherical and deformed shapes at low excitation energies in the Co69,71,73 isotopes. The distorted-wave impulse approximation (DWIA) framework was used to calculate the single-particle cross sections. These values were compared with the experimental findings.

Published
2020

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

Author

Frotscher, A., Gómez-Ramos, M., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Paul, N., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J.Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Shimizu, N., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A.M., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Dombradi, Zs., Flavigny, F., Franchoo, S., Giacoppo, F., Górska, M., Gottardo, A., Hadyńska-Klęk, K., Korkulu, Z., Koyama, S., Kubota, Y., Jungclaus, A., Lee, J., Lettmann, M., Linh, B.D., Liu, J., Liu, Z., Lizarazo, C., Louchart, C., Lozeva, R., Matsui, K., Miyazaki, T., Moschner, K., Nagamine, S., Nakatsuka, N., Nita, C., Nishimura, S., Nobs, C.R., Olivier, L., Ota, S., Patel, Z., Podolyák, Zs., Rudigier, M., Sahin, E., Saito, T.Y., Shand, C., Söderström, P.A., Stefan, I.G., Sumikama, T., Suzuki, D., Orlandi, R., Vaquero, V., Vajta, Zs., Werner, V., Wimmer, K., Wu, J., Xu, Z., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

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

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

Published
2020

31. Transition strengths in the neutron-rich $^{73,74,75}$Ni isotopes

Author

Gottardo, A., de Angelis, G., Doornenbal, P., Coraggio, L., Gargano, A., Itaco, N., Kaneko, K., Van Isacker, P., Furumoto, T., Benzoni, G., Lee, J., Liu, H., Matsushita, M., Mengoni, D., Modamio-Hoybjor, V., Momiyama, S., Motobayashi, T., Napoli, D. R., Niikura, M., Sahin, E., Shiga, Y., Sakurai, H., Taniuchi, R., Takeuchi, S., Wang, H., Valiente-Dobòn, J. J., Avigo, R., Baba, H., Blasi, N., Bello Garrote, F. L., Browne, F., Crespi, F. C. L., Ceruti, S., Daido, R., Delattre, M.-C., Fang, D., Dombradi, Zs., Isobe, T., Kuti, I., Lorusso, G., Matsui, K., Melon, B., Miyazaki, T., Nishimura, S., Orlandi, R., Patel, Z., Rice, S., Sinclair, L., Söderström, P. A., Sohler, D., Sumikama, T., Taprogge, J., Vajta, Zs., Watanabe, H., Wieland, O., Wu, J., Xu, Z. Y., Yalcinkaya, M., Yokoyama, R., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

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

International audience; Reduced transition probabilities have been measured for the neutron-rich Ni73,74,75 nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. For the even-even Ni isotope the determined B(E2;0+→2+) value is compatible within errors with the result of a previous intermediate energy Coulomb excitation experiment, although being somewhat larger. For the odd Ni isotopes B(E2) values have been determined for the first time. In the middle νg9/2 shell nucleus Ni73 three peak candidates have been observed and tentatively assigned to the (5/2+), (13/2+), and (11/2+) excitations. Two peak candidates have been observed in Ni75 and tentatively assigned to the (13/2+) and (11/2+) levels. The measured B(E2) values are in line with the large B(E2) reported in Ni70 and at variance with the small strength measured in Ni72. Excitation energies compare well with the result of large-scale shell-model calculations, while B(E2) values are larger than predicted. This could indicate an increasing contribution of proton excitations across the Z=28 shell closure when approaching Ni78.

Published
2020

32. β decay of Ni 75 and the systematics of the low-lying level structure of neutron-rich odd-A Cu isotopes

Author

Bello Garrote, F.L., Sahin, E., Tsunoda, Y., Otsuka, T., Görgen, A., Niikura, M., Nishimura, S., Angelis, G. de, Benzoni, G., Morales, Ana I., Modamio, V., Xu, Z. Y., Baba, H., Browne, F., Bruce, A.M., Ceruti, S., Crespi, F.C.L., Daido, R., Delattre, M. C., Doornenbal, P., Dombrádi, Zs., Fang, Y., Franchoo, S., Gey, G., Gottardo, A., Hadynska-Klek, K., Isobe, T., John, P. R., Jung, H. S., Kojouharov, I., Kubo, T., Kurz, N., Kuti, I., Li, Z., Lorusso, G., Matea, I., Matsui, K., Mengoni, D., Miyazaki, T., Momiyama, S., Morfouace, P., Napoli, D.R., Naqvi, F., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Rice, S., Sakurai, H., Taprogge, J., Vajta, Zs., Valiente-Dobón, J. J., Watanabe, H., Wermer, V., Wu, J., Yagi, A., Yalcinkaya, M., Yokoyama, R., Yoshinaga, K., Suzuki, D., Sumikama, T., Stefan, I. G., Sohler, D., Söderström, A.-P., Sinclair, L., Schaffner, H., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Research Council of Norway, Japan Society for the Promotion of Science, Department of Energy (US), Federal Ministry of Education and Research (Germany), Ministerio de Ciencia e Innovación (España), Hungarian Scientific Research Fund, National Center for High Performance Computing (Turkey), Ministry of Education, Science and Technology (South Korea), and National Research Foundation of Korea

Abstract

13 pags., 11 figs., 3 tabs., Background: Detailed spectroscopy of neutron-rich odd-A Cu isotopes is of great importance for studying the shell evolution in the region of Ni78. While there is experimental information on excited states in Cu69-73,77,79 isotopes, the information concerning Cu75 is very limited. Purpose: Experimentally observed single-particle, core-coupling, and proton-hole intruder states in Cu75, will complete the systematics of these states in the chain of isotopes. Method: Excited states in Cu75 were populated in the β decay of Ni75 isotopes. The Ni nuclei were produced by the in-flight fission of U238 projectiles, and were separated, identified, and implanted in a highly segmented Si detector array for the detection of the β-decay electrons. The β-delayed γ rays were detected in a HPGe cluster array. Monte Carlo shell model calculations were performed using the A3DA interaction built on the pfg9/2d5/2 model space for both neutrons and protons. Results: A level scheme of Cu75 was built up to ≈4 MeV by performing a γ-γ coincidence analysis. The excited states below 2 MeV were interpreted based on the systematics of neutron-rich odd-A Cu isotopes and the results of the shell model calculations. Conclusions: The evolution of the single-particle, core-coupling, and proton-hole intruder states in the chain of neutron-rich odd-A Cu isotopes is discussed in the present work, in connection with the newly observed level structure of Cu75., This work was carried out at the RIBF operated by RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. The research leading to the results has received funding from the Research Council of Norway under project Grants No. 240104 and No. 213442 and from KAKENHI (under Grants No. 25247045, No. 23.01752, and No. 25800130); U.S. DOE Grant No. DE-FG02-91ER-40609; German BMBF Grant No. 05P19RDFN1 and DFG Grant No. SFB 1245; Spanish Ministerio de Ciencia e Innovación Contracts No. FPA2009-13377C02 and No. FPA2011-29854- C04; and GINOP-2.3.3-15-2016-00034 and the Hungarian Scientific Research Fund OTKA Contract No. K128947. The Monte Carlo shell-model calculations were performed on K computer at RIKEN AICS (hp140210, hp150224, hp160211). This work was supported in part by the HPCI Strategic Program (The Origin of Matter and the Universe), by “Priority Issue on Post-K computer” (Elucidation of the Fundamental Laws and Evolution of the Universe) (hp160211), and by CNS-RIKEN joint project for large-scale nuclear structure calculations. The authors acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. Part of the WAS3ABi was supported by the Rare Isotope Science Project which is funded by the Ministry of Education, Science and Technology (MEST) and National Research Foundation (NRF) of Korea.

Published
2020

33. Determination of beta-delayed neutron emission probability limits of rhodium isotopes by gamma-ray spectroscopy

Author

Science and Technology Facilities Council (UK), Department for Business, Energy and Industrial Strategy (UK), National Measurement System (UK), Department of Energy (US), Shearman, R., Shearman, G., Boso, A., Regan, P.H., Nishimura, S., Xu, Z.Y., Jungclaus, Andrea, Shimizu, Y., Simpson, G.S., Soderstrom, P.-A., Watanabe, H., Browne, F., Doornenbal, P., Gey, G., Jung, H.S., Meyer, B., Sumikama, T., Taprogge, J., Vajta, Zs., Wu, J., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhauser, R., Inabe, N., Isobe, T., Kajino, T., Kameda, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., Sakurai, H., Schaffner, H., Schury, P., Shibagaki, S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yagi, A., Yoshinaga, K., Montaner-Pizá, A., Science and Technology Facilities Council (UK), Department for Business, Energy and Industrial Strategy (UK), National Measurement System (UK), Department of Energy (US), Shearman, R., Shearman, G., Boso, A., Regan, P.H., Nishimura, S., Xu, Z.Y., Jungclaus, Andrea, Shimizu, Y., Simpson, G.S., Soderstrom, P.-A., Watanabe, H., Browne, F., Doornenbal, P., Gey, G., Jung, H.S., Meyer, B., Sumikama, T., Taprogge, J., Vajta, Zs., Wu, J., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhauser, R., Inabe, N., Isobe, T., Kajino, T., Kameda, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., Sakurai, H., Schaffner, H., Schury, P., Shibagaki, S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yagi, A., Yoshinaga, K., and Montaner-Pizá, A.

Abstract

The decay of five neutron-heavy rhodium isotopes were studied at the Radioactive Isotope Beam Factory (RIBF) Facility at the RIKEN Nishina Center after relativistic fission of 238U beam on a thick beryllium target. Previously unknown associated gamma-ray decay energies are reported for each nuclide, and through evaluating the intensity of the 2+ → 0+ E2 transition in the even-even palladium daughter nuclei, 120,122,124Pd, from the beta-tagged gamma-ray spectra an upper or lower limit of beta-delayed neutron emission is deduced for each nuclei. A general, expected trend of increasing Pn is observed in the direction of the neutron drip line.

Published
2020

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

Author

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

Abstract

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

Published
2020

35. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Author

Zhang, G.X., Watanabe, H., Dracoulis, G.D., Kondev, F.G., Lane, G.J., Regan, P.H., Söderström, P.-A., Walker, P.M., Yoshida, K., Kanaoka, H., Korkulu, Z., Lee, P.S., Liu, J.J., Nishimura, S., Wu, J., Yagi, A., Ahn, D.S., Alharbi, T., Baba, H., Browne, F., Bruce, A.M., Carpenter, M.P., Carroll, R.J., Chae, K.Y., Chiara, C.J., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lauritsen, T., Lee, C.S., Lee, E.J., Lister, C.J., Lorusso, G., Lotay, G., McCutchan, E.A., Moon, C.-B., Nishizuka, I., Nita, C.R., Odahara, A., Patel, Z., Phong, V.H., Podolyák, Zs., Roberts, O.J., Sakurai, H., Schaffner, H., Seweryniak, D., Shand, C.M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J.J., Xu, Z.Y., and Zhu, S.

Published
2019
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36. Determination of beta-delayed neutron emission probability limits of rhodium isotopes by gamma-ray spectroscopy

Author

Shearman, R, primary, Lorusso, G, additional, Boso, A, additional, Regan, P H, additional, Nishimura, S, additional, Xu, Z Y, additional, Jungclaus, A, additional, Shimizu, Y, additional, Simpson, G S, additional, Söderström, P-A, additional, Watanabe, H, additional, Browne, F, additional, Doornenbal, P, additional, Gey, G, additional, Jung, H S, additional, Meyer, B, additional, Sumikama, T, additional, Taprogge, J, additional, Vajta, Zs, additional, Wu, J, additional, Baba, H, additional, Benzoni, G, additional, Chae, K Y, additional, Crespi, F C L, additional, Fukuda, N, additional, Gernhäuser, R, additional, Inabe, N, additional, Isobe, T, additional, Kajino, T, additional, Kameda, D, additional, Kim, G D, additional, Kim, Y-K, additional, Kajouharov, I, additional, Kondev, F G, additional, Kubo, T, additional, Kurz, N, additional, Kwon, Y K, additional, Lane, G J, additional, Li, Z, additional, Montaner-Pizá, A, additional, Moschner, K, additional, Naqvi, F, additional, Niikura, M, additional, Nishibata, H, additional, Odahara, A, additional, Orlandi, R, additional, Patel, Z, additional, Podolyák, Zs, additional, Sakurai, H, additional, Schaffner, H, additional, Schury, P, additional, Shibagaki, S, additional, Steiger, K, additional, Suzuki, H, additional, Takeda, H, additional, Wendt, A, additional, Yagi, A, additional, and Yoshinaga, K, additional

Published
2020
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37. Inclusive cross sections for one- and multi-nucleon removal from Sn, Sb, and Te projectiles beyond the N = 82 shell closure

Author

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

Published
2019
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38. New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure

Author

Watanabe, H., Wang, H.K., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.-A., Doornenbal, P., Browne, F., Gey, G., Jung, H.S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.-B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Published
2019
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39. β decay of Ni75 and the systematics of the low-lying level structure of neutron-rich odd- A Cu isotopes

Author

Bello Garrote, F. L., primary, Sahin, E., additional, Tsunoda, Y., additional, Otsuka, T., additional, Görgen, A., additional, Niikura, M., additional, Nishimura, S., additional, de Angelis, G., additional, Benzoni, G., additional, Morales, A. I., additional, Modamio, V., additional, Xu, Z. Y., additional, Baba, H., additional, Browne, F., additional, Bruce, A. M., additional, Ceruti, S., additional, Crespi, F. C. L., additional, Daido, R., additional, Delattre, M.-C., additional, Doornenbal, P., additional, Dombradi, Zs., additional, Fang, Y., additional, Franchoo, S., additional, Gey, G., additional, Gottardo, A., additional, Hadyńska-Klȩk, K., additional, Isobe, T., additional, John, P. R., additional, Jung, H. S., additional, Kojouharov, I., additional, Kubo, T., additional, Kurz, N., additional, Kuti, I., additional, Li, Z., additional, Lorusso, G., additional, Matea, I., additional, Matsui, K., additional, Mengoni, D., additional, Miyazaki, T., additional, Momiyama, S., additional, Morfouace, P., additional, Napoli, D. R., additional, Naqvi, F., additional, Nishibata, H., additional, Odahara, A., additional, Orlandi, R., additional, Patel, Z., additional, Rice, S., additional, Sakurai, H., additional, Schaffner, H., additional, Sinclair, L., additional, Söderström, P.-A., additional, Sohler, D., additional, Stefan, I. G., additional, Sumikama, T., additional, Suzuki, D., additional, Taniuchi, R., additional, Taprogge, J., additional, Vajta, Zs., additional, Valiente-Dobón, J. J., additional, Watanabe, H., additional, Werner, V., additional, Wu, J., additional, Yagi, A., additional, Yalcinkaya, M., additional, Yokoyama, R., additional, and Yoshinaga, K., additional

Published
2020
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40. Isomeric and β -decay spectroscopy of Ho173,174

Author

Liu, J. J., primary, Lee, J., additional, Watanabe, H., additional, Nishimura, S., additional, Zhang, G. X., additional, Wu, J., additional, Walker, P. M., additional, Regan, P. H., additional, Söderström, P.-A., additional, Kanaoka, H., additional, Korkulu, Z., additional, Lee, P. S., additional, Yagi, A., additional, Dai, A. C., additional, Xu, F. R., additional, Ahn, D. S., additional, Alharbi, T., additional, Baba, H., additional, Browne, F., additional, Bruce, A. M., additional, Carroll, R. J., additional, Chae, K. Y., additional, Dombradi, Zs., additional, Doornenbal, P., additional, Estrade, A., additional, Fukuda, N., additional, Griffin, C., additional, Ideguchi, E., additional, Inabe, N., additional, Isobe, T., additional, Kanaya, S., additional, Kojouharov, I., additional, Kondev, F. G., additional, Kubo, T., additional, Kubono, S., additional, Kurz, N., additional, Kuti, I., additional, Lalkovski, S., additional, Lane, G. J., additional, Lee, C. S., additional, Lee, E. J., additional, Lorusso, G., additional, Lotay, G., additional, Moon, C.-B., additional, Nishizuka, I., additional, Nita, C. R., additional, Odahara, A., additional, Patel, Z., additional, Phong, V. H., additional, Podolyák, Zs., additional, Roberts, O. J., additional, Sakurai, H., additional, Schaffner, H., additional, Shand, C. M., additional, Shimizu, Y., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Terashima, S., additional, Vajta, Zs., additional, Valiente-Dobón, J. J., additional, and Xu, Z. Y., additional

Published
2020
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41. Transition strengths in the neutron-rich Ni73,74,75 isotopes

Author

Gottardo, A., primary, de Angelis, G., additional, Doornenbal, P., additional, Coraggio, L., additional, Gargano, A., additional, Itaco, N., additional, Kaneko, K., additional, Van Isacker, P., additional, Furumoto, T., additional, Benzoni, G., additional, Lee, J., additional, Liu, H., additional, Matsushita, M., additional, Mengoni, D., additional, Modamio-Hoybjor, V., additional, Momiyama, S., additional, Motobayashi, T., additional, Napoli, D. R., additional, Niikura, M., additional, Sahin, E., additional, Shiga, Y., additional, Sakurai, H., additional, Taniuchi, R., additional, Takeuchi, S., additional, Wang, H., additional, Valiente-Dobòn, J. J., additional, Avigo, R., additional, Baba, H., additional, Blasi, N., additional, Bello Garrote, F. L., additional, Browne, F., additional, Crespi, F. C. L., additional, Ceruti, S., additional, Daido, R., additional, Delattre, M.-C., additional, Fang, D., additional, Dombradi, Zs., additional, Isobe, T., additional, Kuti, I., additional, Lorusso, G., additional, Matsui, K., additional, Melon, B., additional, Miyazaki, T., additional, Nishimura, S., additional, Orlandi, R., additional, Patel, Z., additional, Rice, S., additional, Sinclair, L., additional, Söderström, P. A., additional, Sohler, D., additional, Sumikama, T., additional, Taprogge, J., additional, Vajta, Zs., additional, Watanabe, H., additional, Wieland, O., additional, Wu, J., additional, Xu, Z. Y., additional, Yalcinkaya, M., additional, and Yokoyama, R., additional

Published
2020
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42. Sequential Nature of (p,3p) Two-Proton Knockout from Neutron-Rich Nuclei

Author

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

Published
2020
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43. Shell structure of the neutron-rich isotopes Co69,71,73

Author

Lokotko, T., primary, Leblond, S., additional, Lee, J., additional, Doornenbal, P., additional, Obertelli, A., additional, Poves, A., additional, Nowacki, F., additional, Ogata, K., additional, Yoshida, 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, Gillibert, A., additional, Isobe, T., additional, Lapoux, V., additional, Matsushita, M., additional, Momiyama, S., additional, Motobayashi, T., additional, Niikura, M., additional, Otsu, H., additional, Péron, C., additional, Peyaud, A., additional, Pollacco, E. C., additional, Roussé, J.-Y., additional, Sakurai, H., additional, Santamaria, C., additional, Xu, Z. Y., additional, Sasano, M., additional, Shiga, Y., additional, Takeuchi, S., additional, Taniuchi, R., additional, Uesaka, T., additional, Wang, H., additional, Werner, V., 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, Lettmann, M., additional, Louchart, C., 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., additional, Söderström, P.-A., additional, Stefan, I., additional, Steppenbeck, D., additional, Sumikama, T., additional, Suzuki, D., additional, Vajta, Zs., additional, and Wu, J., additional

Published
2020
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44. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in Dy and Dy

Author

Zhang, G.X., Watanabe, H., Dracoulis, G.D., Kondev, F.G., Lane, G.J., Regan, P.H., Söderström, P.A., Walker, P.M., Yoshida, K., Kanaoka, H., Korkulu, Z., Lee, P.S., Liu, J.J., Nishimura, S., Wu, J., Yagi, A., Ahn, D.S., Alharbi, T., Baba, H., Browne, F., Bruce, A.M., Carpenter, M.P., Carroll, R.J., Chae, K.Y., Chiara, C.J., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lauritsen, T., Lee, C.S., Lee, E.J., Lister, C.J., Lorusso, G., Lotay, G., McCutchan, E.A., Moon, C.B., Nishizuka, I., Nita, C.R., Odahara, A., Patel, Z., Phong, V.H., Podolyák, Zs., Roberts, O.J., Sakurai, H., Schaffner, H., Seweryniak, D., Shand, C.M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J.J., Xu, Z.Y., and Zhu, S.

Abstract

The neutron-rich dysprosium isotopes $^{168}$Dy$_{102}$ and $^{169}$Dy$_{103}$ have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For $^{168}$Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched $^{170}$Er target performed at Argonne National Laboratory. This isomer is assigned Jπ=Kπ=(4−) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N=102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In $^{169}$Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ=(1/2−) isomeric state at 166 keV to the Kπ=(5/2−) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N=103 isotone $^{173}$Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

Published
2019

45. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in ¹⁶⁸Dy and ¹⁶⁹Dy

Author

Zhang, G.X., Watanabe, H., Dracoulis, G.D., Kondev, F.G., Lane, G.J., Regan, P.H., Söderström, P.-A., Walker, P.M., Yoshida, K., Kanaoka, H., Korkulu, Z., Lee, P.S., Liu, J.J., Nishimura, S., Wu, J., Yagi, A., Ahn, D.S., Alharbi, T., Baba, H., Browne, F., Bruce, A.M., Carpenter, M.P., Carroll, R.J., Chae, K.Y., Chiara, C.J., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lauritsen, T., Lee, C.S., Lee, E.J., Lister, C.J., Lorusso, G., Lotay, G., McCutchan, E.A., Moon, C.-B., Nishizuka, I., Nita, C.R., Odahara, A., Patel, Z., Phong, V.H., Podolyak, Zs., Roberts, O.J., Sakurai, H., Schaffner, H., Seweryniak, D., Shand, C.M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J.J., Xu, Z.Y., and Zhu, S.

Abstract

The neutron-rich dysprosium isotopes ¹⁶⁸Dy₁₀₂ and ¹⁶⁹Dy₁₀₃ have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For ¹⁶⁸Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched ¹⁷⁰Er target performed at Argonne National Laboratory. This isomer is assigned Jπ = Kπ = (4⁻) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In ¹⁶⁹Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ = (1/2⁻) isomeric state at 166 keV to the Kπ = (5/2⁻) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone ¹⁷³Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

Published
2019

46. Proton Shell Evolution below Sn-132: First Measurement of Low-Lying beta-Emitting Isomers in Ag-123,Ag-325

Author

Chen, ZQ, Li, ZH, Hua, H, Watanabe, H, Yuan, CX, Zhang, SQ, Lorusso, G, Nishimura, S, Baba, H, Browne, F, Benzoni, G, Chae, KY, Crespi, FCL, Doornenbal, P, Fukuda, N, Gey, G, Gernhaeuser, R, Inabe, N, Isobe, T, Jiang, DX, Jungclaus, A, Jung, HS, Jin, Y, Kameda, D, Kim, GD, Kim, YK, Kojouharov, I, Kondev, FG, Kubo, T, Kurz, N, Kwon, YK, Li, XQ, Lou, JL, Lane, GJ, Li, CG, Luo, DW, Montaner-Piza, A, Moschner, K, Niu, CY, Naqvi, F, Niikura, M, Nishibata, H, Odahara, A, Orlandi, R, Patel, Z, Podolyak, Zs, Sumikama, T, Soderstrom, P-A, Sakurai, H, Schaffner, H, Simpson, GS, Steiger, K, Suzuki, H, Taprogge, J, Takeda, H, Vajta, Zs, Wang, HK, Wu, J, Wendt, A, Wang, CG, Wu, HY, Wang, X, Wu, CG, Xu, C, Xu, ZY, Yagi, A, Ye, YL, and Yoshinaga, K

Subjects
RIKEN, Science & Technology, IMPACT, Physics, Physical Sciences, Physics, Multidisciplinary, ISOTOPES, DECAY
Abstract

The β-delayed γ-ray spectroscopy of neutron-rich ^{123,125}Ag isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2^{-} β-emitting isomers in ^{123,125}Ag 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. Shell-model calculations with the state-of-the-art V_{MU} plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in ^{123,125}Ag. 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 ^{123}Ag can be well interpreted in terms of the monopole shift of the π1g_{9/2} orbitals mainly caused by the increasing occupation of ν1h_{11/2} orbitals. ispartof: PHYSICAL REVIEW LETTERS vol:122 issue:21 ispartof: location:United States status: published

Published
2019

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

Author

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

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

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

Published
2019

48. Proton Shell Evolution below ^{132}Sn: First Measurement of Low-Lying β-Emitting Isomers in ^{123,125}Ag

Author

Chen, Z. Q., Li, Z. H., Hua, H., Watanabe, H., Yuan, C. X., Zhang, S. Q., Lorusso, G., Nishimura, S., Baba, H., Browne, F., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Doornenbal, P., Fukuda, N., Gey, G., Gernhäuser, R., Inabe, N., Isobe, T., Jiang, D. X., Jungclaus, A., Jung, H. S., Jin, Y., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Li, X. Q., Lou, J. L., Lane, G. J., Li, C. G., Luo, D. W., Montaner-Pizá, A., Moschner, K., Niu, C. Y., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., Sumikama, T., Söderström, P.-A., Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, H., Taprogge, J., Takeda, H., Vajta, Zs., Wang, H. K., Wu, J., Wendt, A., Wang, C. G., Wu, H. Y., Wang, X., Wu, C. G., Xu, C., Xu, Z. Y., Yagi, A., Ye, Y. L., and Yoshinaga, K.

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

49. New isomers in Pd And Pd : Competing proton and neutron excitations in neutron-rich palladium nuclides towards the = 82 Shell Closure

Author

Watanabe, H., Wang, H.K., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.A., Doornenbal, P., Browne, F., Gey, G., Jung, H.S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Abstract

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N=82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in $^{125}$Pd$_{79}$ and $^{127}$Pd$_{81}$ studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity $^{238}$U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2+) and (19/2+) in $^{125}$Pd and $^{127}$Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus $^{132}$Sn.

Published
2019

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

Author

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

Subjects
Nuclear Experiment
Abstract

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

Published
2019

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