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161 results on '"Ahn, D.S."'

2. Status of LAMPS at RAON

Author

Hong, B., Ahn, D.S., Ahn, J.K., Bae, J., Bae, Y., Bok, J.S., Choi, S.W., Do, S., Heo, C., Huh, J., Hwang, J., Jang, Y., Kang, B., Kim, A., Kim, B.K., Kim, C., Kim, E.-J., Kim, G.W., Kim, G.Y., Kim, H.C., Kim, J.S., Kim, J.Y., Kim, S.H., Kim, Y., Kim, Y.J., Kim, Y.S., Kweon, M., Lee, C.S., Lee, H.I., Lee, H.J., Lee, H.S., Lee, J.H., Lee, J.S., Lee, J.-W., Lee, J.W., Lee, S.H., Lee, S.J., Lim, S.H., Moon, D.H., Nam, S.H., Park, J., Park, J.H., Seo, J., and Yang, H.M.

Published
2023
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8. Neutron capture reaction cross-section of 79Se through the 79Se(d,p) reaction in inverse kinematics

Author

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

Published
2024
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9. Energy-control and novel particle-identification methods combined with range in a multi-sampling ionization chamber for experiments using slowed-down RI beams

Author

Sumikama, T., Ahn, D.S., Fukuda, N., Shimizu, Y., Suzuki, H., Takeda, H., Wang, H., Yoshida, K., Amano, J., Chiga, N., Chikaato, K., Hirayama, A., Inabe, N., Kawase, S., Kubono, S., Matsushita, M., Michimasa, S., Nakano, K., Otsu, H., Sakurai, H., Saito, A., Shimoura, S., Suwa, J., Takechi, M., Takeuchi, S., Togano, Y., Tomai, T., and Watanabe, Y.

Published
2021
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10. New energy-degrading beamline for in-flight RI beams, OEDO

Author

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

Published
2020
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12. Study of spin-isospin responses of radioactive nuclei with the background-reduced neutron spectrometer, PANDORA

Author

Stuhl, L., Sasano, M., Gao, J., Hirai, Y., Yako, K., Wakasa, T., Ahn, D.S., Baba, H., Chilug, A.I., Franchoo, S., Fujino, Y., Fukuda, N., Gibelin, J., Hahn, I.S., Halász, Z., Harada, T., Harakeh, M.N., Inomoto, D., Isobe, T., Kasahara, H., Kim, D., Kiss, G.G., Kobayashi, T., Kondo, Y., Korkulu, Z., Koyama, S., Kubota, Y., Kurihara, A., Liu, H.N., Matsumoto, M., Michimasa, S., Miki, H., Miwa, M., Motobayashi, T., Nakamura, T., Nishimura, M., Otsu, H., Panin, V., Park, S., Saito, A.T., Sakai, H., Sato, H., Shimada, T., Shimizu, Y., Shimoura, S., Spiridon, A., Stefanescu, I.C., Sun, X., Sun, Y.L., Suzuki, H., Takada, E., Togano, Y., Tomai, T., Trache, L., Tudor, D., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., Yoneda, K., Yoshida, K., Zenihiro, J., and Zhang, N.

Published
2020
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14. New ion-optical operating modes of the BigRIPS and ZeroDegree spectrometer for the production and separation of high-quality rare isotopes beams and high-resolution spectrometer experiments

Author

Takeda, H., Tanaka, Y.K., Suzuki, H., Ahn, D.S., Franczak, B., Fukuda, N., Geissel, H., Haettner, E., Inabe, N., Itahashi, K., Komatsubara, T., Kubo, T., Kusaka, K., Matsumoto, S.Y., Murai, D., Nishi, T., Ohtake, M., Scheidenberger, C., Shimizu, Y., Sumikama, T., Ueno, H., Uesaka, T., Yanagisawa, Y., and Yoshida, K.

Published
2020
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15. The β-decay of 71Kr: Precise measurement of the half-life

Author

Vitéz-Sveiczer A., Algora A., Kiss G.G., Rubio B., Morales A.I., Sarriguren P., de Angelis G., Recchia F., Nishimura S., Agramunt J., Guadilla V., Montaner-Pizá A., Orrigo S.E.A., Horváth Á., Napoli D., Lenzi S., Boso A., Phong V., Wu J., Söderström P.-A., Sumikama T., Suzuki H., Takeda H., Ahn D.S., Baba H., Doornenbal P., Fukuda N., Inabe N., Isobe T., Kubo T., Kubono S., Sakurai H., Shimizu Y., Sidong C., Blank B., Ascher P., Gerbaux M., Goigoux T., Giovinazzo J., Grévy S., Kurtukián Nieto T., Magron C., Gelletly W., Dombrádi Zs., Fujita Y., Tanaka M., Aguilera P., Molina F., Eberth J., Diel F., Lubos D., Borcea C., Ganioglu E., Nishimura D., Oikawa H., Takei Y., Yagi S., Korten W., de France G., Davies P., Liu J., Lee J., Lokotko T., Kojouharov I., Kurz N., Shaffner H., and Petrovici A.

Subjects
Physics, QC1-999
Abstract

The very proton-rich 71Kr isotope was produced through the in-flight fragmentation of 78Kr on a beryllium target at RIKEN – Nishina Center in order to study its β-decay properties. A stack of double-sided silicon strip detectors, called WAS3ABi, was used as the decay station, where the detection of ion implants, β-decays and β-delayed protons took place. Beta-delayed γ-rays were measured using a system of 84 HPGe detectors, called EURICA, surrounding the decay station. The main goal of the present study was the precise measurement of the half-life of 71Kr, as in the literature there is an almost 10 σ difference between the most precise independent results. Implant–β time correlations, implant–proton time correlations and implant–β–γ time correlations were all used to derive the half-life value, followed by a thorough investigation of systematic uncertainties for each method. As these values were found to be consistent, the weighted average t1/2 = 94.40+19ms is reported as a new half-life value in this work. Furthermore a total of 26 previously unreported γ following the β-decay of 71Kr were also identified in the analysis.

Published
2023
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16. Shape coexistence in 66Se

Author

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

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

Author

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

Published
2024
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18. Shape coexistence in Se

Author

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

Abstract

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

Published
2023

19. ß -delayed neutron emissions from N>50 gallium isotopes

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Yokoyama, Rin, Grzywacz, Robert, Rasco, B. Charles, Brewer, Nathan, Rykaczewski, Krzysztof P., Dillmann, Iris, Taín Enríquez, José Luis, Nishimura, Shunji, Ahn, D.S., Algora, Alejandro, Allmond, James Mitchell, Agramunt Ros, Jorge, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Yokoyama, Rin, Grzywacz, Robert, Rasco, B. Charles, Brewer, Nathan, Rykaczewski, Krzysztof P., Dillmann, Iris, Taín Enríquez, José Luis, Nishimura, Shunji, Ahn, D.S., Algora, Alejandro, Allmond, James Mitchell, Agramunt Ros, Jorge, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban

Abstract

This is an Accepted Manuscript, the final version can be found at: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.108.064307 ©2024 American Physical Society., ß-delayed ¿-neutron spectroscopy has been performed on the decay of A = 84 to 87 gallium isotopes at the RI-beam Factory at the RIKEN Nishina Center using a high-efficiency array of 3He neutron counters (BRIKEN). ß-2n-¿ events were measured in the decays of all of the four isotopes for the first time, which is direct evidence for populating the excited states of two-neutron daughter nuclei. Detailed decay schemes with the ¿ branching ratios were obtained for these isotopes and the neutron emission probabilities (Pxn) were updated from the previous study. Hauser-Feshbach statistical model calculations were performed to understand the experimental branching ratios. We found that the P1n and P2n values are sensitive to the nuclear level densities of 1n daughter nuclei and showed that the statistical model reproduced the P2n/P1n ratio better when experimental levels + shell-model level densities fit by the Gilbert-Cameron formula were used as the level-density input. We also showed the neutron and ¿ branching ratios are sensitive to the ground-state spin of the parent nucleus. Our statistical model analysis suggested J = 3 for the unknown ground-state spin of the odd-odd nucleus, 86Ga, from the I¿(4+ ¿ 2 +)/I¿(2+ ¿ 0 +) ratio of 84Ga and the P2n/P1n ratio. These results show the necessity of detailed understanding of the decay scheme, including data from neutron spectroscopy, in addition to ¿ measurements of the multi-neutron emitters., This experiment was performed at the RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Award No. DE-FG02-96ER40983 (UTK) and DE-AC05-00OR22725 (ORNL), No. DE-SC0016988 (TTU) and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DE-NA0002132. This work was supported by National Science Foundation under Grants No. PHY-1430152 (JINA Center for the Evolution of the Elements), No. PHY-1565546 (NSCL), and No. PHY-1714153 (Central Michigan University). This work was partially funded by the Polish National Science Center under Contracts No. UMO2015/18/E/ST2/00217, 2020/39/B/ST2/02346, and No. 2017/01/X/ST2/01144. This work was also supported by JSPS KAKENHI (Grants No. 14F04808, No. 17H06090, No. 25247045, 20H05648, 22H04946 and No. 19340074), by the UK Science and Technology Facilities Council, by NKFIH (NN128072), by Spanish Ministerio de Economia y Competitividad grants (FPA2011-06419, FPA2011- 28770-C03-03, FPA2014-52823-C2-1-P, FPA2014-52823- C2-2-P, SEV-2014-0398, IJCI-2014-19172), by Generarlitat Valenciana regional grant PROMETEO/2019/007, by European Commission FP7/EURATOM Contract No. 605203, by the UK Science and Technology Facilities Council Grant No. ST/N00244X/1, ST//P004598/1, and ST/V001027/1 by the National Research Foundation (NRF) in South Korea (No. 2016K1A3A7A09005575, No. 2015H1A2A1030275) and by the Natural Sciences and Engineering Research Council of Canada (NSERC) via the Discovery Grants SAPIN-2014-00028 and RGPAS 462257-2014. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. The author, R.Y. acknowledges support from JSPS KAKENHI 22K14053. G.G.K. acknowledges support from the Janos Bolyai research fellowship of the Hungarian Academy of Sciences. M.W.- C. acknowledges support from the Pol, Article signat per 72 autors/es: R. Yokoyama, R. Grzywacz, B. C. Rasco, N. Brewer, K. P. Rykaczewski, I. Dillmann, J. L. Tain, S. Nishimura, D. S. Ahn, A. Algora, J. M. Allmond, J. Agramunt, H. Baba, S. Bae, C. G. Bruno, R. Caballero-Folch, F. Calvino, P. J. Coleman-Smith, G. Cortes, T. Davinson, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, J. Ha, O. Hall, L. J. Harkness-Brennan, J. Heideman, T. Isobe, D. Kahl, M. Karny, T. Kawano, L. H. Khiem, T. T. King, G. G. Kiss, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, J. Liang, J. Liu, G. Lorusso, M. Madurga, K. Matsui, K. Miernik, F. Montes, A. I. Morales, P. Morrall, N. Nepal, R. D. Page, V. H. Phong, M. Piersa-Siłkowska, M. Prydderch, V. F. E. Pucknell, M. M. Rajabali, B. Rubio, Y. Saito, H. Sakurai, Y. Shimizu, J. Simpson, M. Singh, D. W. Stracener, T. Sumikama, H. Suzuki, H. Takeda, A. Tarifeño-Saldivia, S. L. Thomas, A. Tolosa-Delgado, M. Wolińska-Cichocka, P. J. Woods, and X. X. Xu, Postprint (published version)

Published
2023

20. The ß-decay of 71Kr: Precise measurement of the half-life

Author

RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), National Research, Development and Innovation Office (Hungary), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, Agencia Nacional de Investigación y Desarrollo (Chile), Vitéz-Sveiczer, A., Algora, Alejandro, Kiss, G.G., Rubio, Berta, Morales, A. I., Sarriguren, Pedro, Angelis, G. de, Recchia, F., Nishimura, S., Agramunt, Jorge, Guadilla Gómez, Víctor, Montaner-Pizá, A., Orrigo, S. E. A., Horváth, Á., Napoli, D., Lenzi, S., Boso, A., Phong, V., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., France, G. de, Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Petrovici, A., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), National Research, Development and Innovation Office (Hungary), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, Agencia Nacional de Investigación y Desarrollo (Chile), Vitéz-Sveiczer, A., Algora, Alejandro, Kiss, G.G., Rubio, Berta, Morales, A. I., Sarriguren, Pedro, Angelis, G. de, Recchia, F., Nishimura, S., Agramunt, Jorge, Guadilla Gómez, Víctor, Montaner-Pizá, A., Orrigo, S. E. A., Horváth, Á., Napoli, D., Lenzi, S., Boso, A., Phong, V., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., France, G. de, Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., and Petrovici, A.

Abstract

The very proton-rich 71Kr isotope was produced through the in-flight fragmentation of 78Kr on a beryllium target at RIKEN ¿ Nishina Center in order to study its ß-decay properties. A stack of double-sided silicon strip detectors, called WAS3ABi, was used as the decay station, where the detection of ion implants, ß-decays and ß-delayed protons took place. Beta-delayed ¿-rays were measured using a system of 84 HPGe detectors, called EURICA, surrounding the decay station. The main goal of the present study was the precise measurement of the half-life of 71Kr, as in the literature there is an almost 10 ¿ difference between the most precise independent results. Implant¿ß time correlations, implant¿proton time correlations and implant¿ß¿¿ time correlations were all used to derive the half-life value, followed by a thorough investigation of systematic uncertainties for each method. As these values were found to be consistent, the weighted average t1/2 = 94.40+19ms is reported as a new half-life value in this work. Furthermore a total of 26 previously unreported ¿ following the ß-decay of 71Kr were also identified in the analysis.

Published
2023

22. Gamow-Teller decay of <math><mmultiscripts><mi>Te</mi><mprescripts/><none/><mn>142</mn></mmultiscripts></math> to <math><mmultiscripts><mi mathvariant='normal'>I</mi><mprescripts/><none/><mn>142</mn></mmultiscripts></math>

Author

Moon, B., Moon, C.-B., Odahara, A., Lozeva, R., Nishimura, S., Yuan, C., Browne, F., Doornenbal, P., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Wu, J., Xu, Z.Y., Yagi, A., Ahn, D.S., Baba, H., Bello Garrote, F.L., Daido, R., Daugas, J.M., Didierjean, F., Fang, Y., Fukuda, N., Hong, B., Ideguchi, E., Inabe, N., Ishigaki, T., Isobe, T., Jung, H.S., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kwon, Y.K., Lee, C.S., Lee, P., Morimoto, S., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Sakurai, H., Shimizu, Y., Suzuki, H., Takeda, H., Tshoo, K., Yokoyama, R., 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Paris-Saclay

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

International audience; The β decay of Te90142 to I89142 was investigated for the first time. The parent nucleus was produced by the in-flight fission of a U238 beam with an energy of 345 MeV per nucleon, impinging on a Be9 target at the Radioactive Isotope Beam Factory of RIKEN. Excited states in I142 were established by β-delayed γ-ray spectroscopy. The observed (1+) states in I142 could be interpreted to be predominantly the ν0h9/2⊗π0h11/2 configuration formed by a Gamow-Teller transition between a neutron in the 0h9/2 orbital and a proton in the 0h11/2 orbital. Additional features of the (1+) states are discussed by comparing with neighboring heavier isotones, such as Cs144 and La146. In the context of deformed shell-model calculations, the (11+) state is closely related to the ν[5,3,2]3/2⊗π[5,5,0]1/2 configuration, which may be related to the weak Gamow-Teller transition strength.

Published
2023

23. Cross-section measurement in the reactions of 136Xe on proton, deuteron and carbon

Author

Sun X., Wang H., Otsu H., Sakurai H., Ahn D.S., Aikawa M., Fukuda N., Isobe T., Kawakami S., Koyama S., Kubo T., Kubono S., Lorusso G., Maeda Y., Makinaga A., Momiyama S., Nakano K., Niikura M., Shiga Y., Söderström P.-A., Suzuki H., Takeda H., Takeuchi S., Taniuchi S., Watanabe Ya., Watanabe Yu., Yamasaki H., and Yoshida K.

Subjects
Physics, QC1-999
Abstract

The isotopic production cross sections for the reactions of 136Xe induced by proton, deuteron and carbon at 168 MeV/u were obtained by using the inverse kinematics technique at RIKEN Radioactive Isotope Beam Factory. The target dependence of the cross sections was investigated systematically. It was found that for the light-mass products, the cross sections on carbon are larger than those on deuteron and proton. The measured cross sections on proton were compared with the previous data at higher reaction energies to study the energy dependence. The experimental results were compared with the theoretical calculations including both the intranuclear cascade and evaporation processes using PHITS and with the EPAX and SPACS empirical parameterizations.

Published
2020
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24. The -decay of Kr into Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., Algora, A., Morales, A.I., Rubio, B., Kiss, G.G., Sarriguren, P., Van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, A., Napoli, D., Lenzi, S., Boso, A., Phong, V.H., Wu, J., Söderström, P.A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., and Petrovici, A.

Abstract

The β-decay of the even-even nucleus $^{70}$Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of $^{70}$Kr into $^{70}$Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of $^{70}$Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1$^{+}$ state in comparison with the heaviest Z=N+2 system studied so far ($^{62}$Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.

Published
2022

25. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., primary, Algora, A., additional, Morales, A.I., additional, Rubio, B., additional, Kiss, G.G., additional, Sarriguren, P., additional, Van Isacker, P., additional, de Angelis, G., additional, Recchia, F., additional, Nishimura, S., additional, Agramunt, J., additional, Guadilla, V., additional, Montaner-Pizá, A., additional, Orrigo, S.E.A., additional, Horváth, A., additional, Napoli, D., additional, Lenzi, S., additional, Boso, A., additional, Phong, V.H., additional, Wu, J., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Ahn, D.S., additional, Baba, H., additional, Doornebal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kubo, T., additional, Kubono, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Sidong, C., additional, Blank, B., additional, Ascher, P., additional, Gerbaux, M., additional, Goigoux, T., additional, Giovinazzo, J., additional, Grévy, S., additional, Kurtukián Nieto, T., additional, Magron, C., additional, Gelletly, W., additional, Dombrádi, Zs., additional, Fujita, Y., additional, Tanaka, M., additional, Aguilera, P., additional, Molina, F., additional, Eberth, J., additional, Diel, F., additional, Lubos, D., additional, Borcea, C., additional, Ganioglu, E., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Korten, W., additional, de France, G., additional, Davies, P., additional, Liu, J., additional, Lee, J., additional, Lokotko, T., additional, Kojouharov, I., additional, Kurz, N., additional, Shaffner, H., additional, and Petrovici, A., additional

Published
2022
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26. Various nuclear structures in Xe 140 studied by β decay of ground and isomeric states in i 140

Author

Yagi, A., Odahara, A., Nishibata, H., Lozeva, R., Moon, C.-B., Nishimura, S., Yoshida, K., Yoshinaga, N., Watanabe, C., Higashiyama, K., Shimoda, T., Daido, R., Fang, Y., Lee, P.S., Moon, B., Doornenbal, P., Lorusso, G., Söderström, P.-A., Sumikama, T., Watanabe, H., Isobe, T., Baba, H., Sakurai, H., Browne, F., Patel, Z., Rice, S., Sinclair, L., Wu, J., Xu, Z.Y., Yokoyama, R., Kubo, T., Inabe, N., Suzuki, H., Fukuda, N., Kameda, D., Takeda, H., Ahn, D.S., Shimizu, Y., Murai, D., Bello Garrote, Frank Leonel, Daugas, J.-M., Didierjean, F., Ideguchi, E., Iimura, S., Ishigaki, T., Jung, H.S., Komatsubara, T., Kwon, Y.K., Lee, C.S., Morimoto, S., Niikura, M., Nishizuka, I., and Tshoo, K.

Abstract

Structure of the neutron-rich N=86 isotope 140Xe, located northeast of a doubly-magic nucleus 132Sn, is investigated by β−γ spectroscopy. Two β-decay isomers in 140I are newly found in the study of two different β decays of 140I which were produced by two reactions (i) direct in-flight fission at a primary target and (ii) β decay of 140Te at an active stopper. Half-lives of the β decays of the ground state, the low-spin isomer, and the high-spin isomer are determined to be 0.38(2), 0.91(5), and 0.47(4) s, respectively. Decay schemes of the β decay of the high-spin isomer and of the mixed β decays of the ground state and the low-spin isomer in 140I to 140Xe are constructed using the information on γ-ray coincidence relation and γ-ray intensity. Nuclear structures of the low-lying states in 140Xe and 140I are discussed by comparing the experimental results to two theoretical calculations based on a large-scale shell model and the deformed Skyrme Hartree-Fock-Bogoliubov plus deformed quasiparticle-random-phase approximation. Possible candidates for (quasi-)γ-band members of 2+ and 4+ states and the octupole collective 1− state are proposed in 140Xe. Increase of quadrupole, triaxial, and octupole collectivities is discussed with the increase of neutron and proton numbers.

Published
2022

27. First observation of the $\pi0h_{11/2}\otimes\nu 0h_{9/2}$ partner orbital configuration in the odd-odd $^{138}$I nucleus

Author

Moon, B., Gargano, A., Naïdja, H., Moon, C.-B., Odahara, A., Lozeva, R., Nishimura, S., Yuan, C., Browne, F., Doornenbal, P., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Wu, J., Xu, Z.Y., Yagi, A., Ahn, D.S., Baba, H., Bello Garrote, F.L., Daido, R., Daugas, J.M., Didierjean, F., Fang, Y., Fukuda, N., Hong, B., Ideguchi, E., Inabe, N., Ishigaki, T., Isobe, T., Jung, H.S., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kwon, Y.K., Lee, C.S., Lee, P., Morimoto, S., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Sakurai, H., Shimizu, Y., Suzuki, H., Takeda, H., Tshoo, K., Yokoyama, R., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Paris-Saclay

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

International audience; The β-decay scheme of Te138 and the level structure of I138 is reported for the first time. The experiment was performed at the Radioactive Isotope Beam Factory of RIKEN, as one of the EUROBALL-RIKEN Cluster Array campaigns. Secondary radioactive ions, including Te138 and Sb138, were produced by the in-flight fission of a U238 beam with the energy of 345 MeV per nucleon. From the β decay of Te138, the level scheme of I138 was supplemented with new spin and parity assignments, such as the low-lying negative-parity states and a positive-parity 1+ state. This 1+ state can be interpreted as being associated with the π0h11/2⊗ν0h9/2 partner orbital configuration populated by the Gamow-Teller transition between a neutron in the 0h9/2 orbital and a proton in the 0h11/2 orbital. Details of the structure of I138 are discussed in terms of the proton-neutron interactions and Gamow-Teller transition strength within the theoretical context of shell-model calculations.

Published
2022

28. First observation of the π0h11/2-ν0h9/2 partner orbital configuration in the odd-odd i 138 nucleus

Author

Moon, B., Gargano, A., Naïdja, H., Moon, C.-B., Odahara, A., Lozeva, R., Nishimura, S., Yuan, C., Browne, F., Doornenbal, P., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Wu, J., Xu, Z.Y., Yagi, A., Ahn, D.S., Baba, H., Bello Garrote, Frank Leonel, Daido, R., Daugas, J.M., Didierjean, F., Fang, Y., Fukuda, N., Hong, B., Ideguchi, E., Inabe, N., Ishigaki, T., Isobe, T., Jung, H.S., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kwon, Y.K., Lee, C.S., Lee, P., Morimoto, S., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Sakurai, H., Shimizu, Y., Suzuki, H., Takeda, H., Tshoo, K., and Yokoyama, R.

Abstract

The β-decay scheme of 138Te and the level structure of 138I is reported for the first time. The experiment was performed at the Radioactive Isotope Beam Factory of RIKEN, as one of the EUROBALL-RIKEN Cluster Array campaigns. Secondary radioactive ions, including 138Te and 138Sb, were produced by the in-flight fission of a 238U beam with the energy of 345 MeV per nucleon. From the β decay of 138Te, the level scheme of 138I was supplemented with new spin and parity assignments, such as the low-lying negative-parity states and a positive-parity 1+ state. This 1+ state can be interpreted as being associated with the π0h11/2⊗ν0h9/2 partner orbital configuration populated by the Gamow-Teller transition between a neutron in the 0h9/2 orbital and a proton in the 0h11/2 orbital. Details of the structure of 138I are discussed in terms of the proton-neutron interactions and Gamow-Teller transition strength within the theoretical context of shell-model calculations.

Published
2022

29. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., Algora, A., Morales, A.I., Rubio, B., Kiss, G.G., Sarriguren, P., van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, A., Napoli, D., Lenzi, S., Boso, A., Phong, V.H., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Petrovici, A., Ministry of Innovation and Technology (Hungary), Agencia Nacional de Investigación y Desarrollo (Chile), RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, QRPA calculations, Kr, Pseudo-SU(4) symmetry, pn pairing, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Beta decay of, 70, GT strength distribution, Beta decay of Kr 70 | GT strength distribution | pn pairing | Pseudo-SU(4) symmetry | QRPA calculations
Abstract

8 pags., 4 figs., 1 tab., The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system., This work was supported by the National Research, Development and Innovation Fund of the Ministry for Innovation and Technology, Hungary with project no. TKP2021-NKTA-42 under the TKP2021 funding scheme. FM acknowledges the support of ANID/FONDECYT Regular 1171467 and ANID/FONDECYT Regular 1221364 national projects. This work was carried out at the RIBF operated by RIKEN Nishina Center and CNS, University of Tokyo. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish MICINN grants FPA2014-52823-C2-1-P, FPA2017- 83946-C2-1-P (MCIU/AEI/FEDER); Ministerio de Ciencia e Innovación grant PID2019-104714GB-C21; Centro de Excelencia Severo Ochoa del IFIC SEV-2014-0398; Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by FSE, by NKFIH (NN128072), the National Research, Development and Innovation Fund of Hungary Project No. K 128729 the STFC (UK) through Grant No. ST/P005314/, the PROMETEO/2019/007 project and by the ÚNKP-20-5-DE-02 New National Excellence Program of the Ministry of Human Capacities of Hungary and by the JSPS KAKENHI of Japan (Grant No. 25247045). G.G. Kiss acknowledges support from the János Bolyai research fellowship of the Hungarian Academy of Sciences. A. A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955) P. S. acknowledges support from MCI/AEI/FEDER,UE (Spain) under grant PGC2018-093636-B-I00.

Published
2022

30. 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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31. Boulay et al. Reply: Comment on 'g Factor of the Zr99(7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region'

Author

Boulay, F., Simpson, G.S., Ichikawa, Y., Kisyov, S., Bucurescu, D., Takamine, A., Ahn, D.S., Asahi, K., Baba, H., Balabanski, D.L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Lozeva, R., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Tao, L.C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X.F., Daugas, J.M., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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
21.60.-n, 25.70.Mn, 23.20.En, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], numbers: 21.10.Ky, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2021

32. Rapidity distributions of Z = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon

Author

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

Published
2021
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33. β-delayed neutron emission of r-process nuclei at the N = 82 shell closure

Author

Hall, O., Davinson, T., Estrade, A., Liu, J., Lorusso, G., Montes, F., Nishimura, S., Phong, V.H., Woods, P.J., Agramunt, J., Ahn, D.S., Algora, A., Allmond, J.M., Baba, H., Bae, S., Brewer, N.T., Bruno, C.G., Caballero-Folch, R., Calviño, F., Coleman-Smith, P.J., Cortes, G., Dillmann, I., Domingo-Pardo, C., Fijalkowska, A., Fukuda, N., Go, S., Griffin, C.J., Grzywacz, R., Ha, J., Harkness-Brennan, L.J., Isobe, T., Kahl, D., Khiem, L.H., Kiss, G.G., Korgul, A., Kubono, S., Labiche, M., Lazarus, I., Liang, J., Liu, Z., Matsui, K., Miernik, K., Moon, B., Morales, A.I., Morrall, P., Mumpower, M.R., Nepal, N., Page, R.D., Piersa, M., Pucknell, V.F.E., Rasco, B.C., Rubio, B., Rykaczewski, K.P., Sakurai, H., Shimizu, Y., Stracener, D.W., Sumikama, T., Suzuki, H., Tain, J.L., Takeda, H., Tarifeño-Saldivia, A., Tolosa-Delgado, A., Wolińska-Cichocka, M., and Yokoyama, R.

Published
2021
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34. Symmetry energy investigation with pion production from Sn+Sn systems

Author

Jhang, G., Estee, J., Barney, J., Cerizza, G., Kaneko, M., Lee, J.W., Lynch, W.G., Isobe, T., Kurata-Nishimura, M., Murakami, T., Tsang, C.Y., Tsang, M.B., Wang, R., Ahn, D.S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Ieki, K., Inabe, N., Kim, Y.J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H.S., Leifels, Y., Łukasik, J., Manfredi, J., McIntosh, A.B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Olsen, R., Otsu, H., Pawłowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sosin, Z., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Toernqvist, H., Togano, Y., Xiao, Z.G., Yennello, S.J., Yurkon, J., Zhang, Y., Colonna, Maria, Cozma, Dan, Danielewicz, Paweł, Elfner, Hannah, Ikeno, Natsumi, Ko, Che Ming, Mohs, Justin, Oliinychenko, Dmytro, Ono, Akira, Su, Jun, Wang, Yong Jia, Wolter, Hermann, Xu, Jun, Zhang, Ying-Xun, and Zhang, Zhen

Published
2021
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35. $\beta$ decay of the very neutron-deficient $^{60}$Ge and $^{62}$Ge nuclei

Author

Orrigo, S.E.A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A.I., Agramunt, J., Ahn, D.S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R.B., Chiba, J., De Angelis, G., De France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioğlu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grévy, S., Guadilla, V., Inabe, N., Kiss, G.G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Pizá, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Shimizu, Y., Sidong, C., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Vi, P., Wu, J., Yagi, S., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

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

We report here the results of a study of the $\beta$ decay of the proton-rich Ge isotopes, $^{60}$Ge and $^{62}$Ge, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of $^{62}$Ge (73.5(1) ms), $^{60}$Ge (25.0(3) ms) and its daughter nucleus, $^{60}$Ga (69.4(2) ms). We measured individual $\beta$-delayed proton and $\gamma$ emissions and their related branching ratios. Decay schemes and absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. A total $\beta$-delayed proton-emission branching ratio of 67(3)% has been obtained for $^{60}$Ge. New information has been obtained on the energy levels populated in $^{60}$Ga and on the 1/2$^-$ excited state in the $\beta p$ daughter $^{59}$Zn. We extracted a ground state to ground state feeding of 85.3(3)% for the decay of $^{62}$Ge. Eight new $\gamma$ lines have been added to the de-excitation of levels populated in the $^{62}$Ga daughter., Comment: 13 pages, 12 figures, 5 tables. Physical Review C 103, 014324 (2021)

Published
2021

36. ß-delayed neutron emission of r-process nuclei at the N¿=¿82 shell closure

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Hall, O, Davinson, T, Estrade, A, Lorusso, G., Montes, F., Nishimura, Shunji, Phong, V.H., Agramunt Ros, Jorge, Woods, Phil J., Ahn, D.S., Algora, A., Baba, H., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Hall, O, Davinson, T, Estrade, A, Lorusso, G., Montes, F., Nishimura, Shunji, Phong, V.H., Agramunt Ros, Jorge, Woods, Phil J., Ahn, D.S., Algora, A., Baba, H., Calviño Tavares, Francisco, and Cortés Rossell, Guillem Pere

Abstract

Theoretical models of ß-delayed neutron emission are used as crucial inputs in r-process calculations. Benchmarking the predictions of these models is a challenge due to a lack of currently available experimental data. In this work the ß-delayed neutron emission probabilities of 33 nuclides in the important mass regions south and south-west of 132Sn are presented, 16 for the first time. The measurements were performed at RIKEN using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The values presented constrain the predictions of theoretical models in the region, affecting the final abundance distribution of the second r-process peak at ., Peer Reviewed, Article signat per 58 autors/es J. Liu, S. Bae, N.T. Brewer, C.G. Bruno, R. Caballero-Folch, P.J. Coleman-Smith, I. Dillmann, C. Domingo-Pardo, A. Fijalkowska, N. Fukuda, S. Go, C.J. Griffin, R. Grzywacz, J. Ha, L. J. Harkness-Brennan, T. Isobe, D. Kahl, L.H. Khiem, G.G. Kiss, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, P. Morrall, M.R. Mumpower, N. Nepal, R.D. Page, M. Piersa , V.F.E. Pucknell , B.C. Rasco, B. Rubio, K.P. Rykaczewski , H. Sakurai , Y. Shimizu , D.W. Stracener, T. Sumikama , H. Suzuki, J.L. Tain , H. Takeda, A. Tarifeño-Saldivia, A. Tolosa-Delgado , M. Wolinska-Cichocka , R. Yokoyama, Postprint (author's final draft)

Published
2021

37. Fragmentation of Single-Particle Strength around the Doubly Magic Nucleus Sn 132 and the Position of the 0f5/2 Proton-Hole State in In 131

Author

Vaquero, Victor, Jungclaus, Andrea, Aumann, T., Tscheuschner, J., Litvinova, E.V., Tostevin, J.A., Baba, H., Ahn, D.S., Avigo, R., Boretzky, K., Bracco, A., Caesar, C., Camera, F., Chen, S., Derya, V., Doornenbal, P., Endres, J., Fukuda, N., Garg, U., Giaz, A., Harakeh, M.N., Heil, M., Horvat, A., Ieki, K., Imai, N., Inabe, N., Kalantar-Nayestanaki, N., Kobayashi, N., Kondo, Y., Koyama, S., Kubo, T., Martel, I., Matsushita, M., Million, B., Motobayashi, T., Nakamura, T., Nakatsuka, Nathan, Nishimura, M., Nishimura, S., Ota, S., Otsu, H., Ozaki, T., Petri, M., Reifarth, R., Rodríguez-Sánchez, J.L., Rossi, D., Saito, A.T., Sakurai, H., Savran, D., RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Economía y Competitividad (España), German Research Foundation, Technische Universität Darmstadt, National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, and Science and Technology Facilities Council (UK)

Subjects
Astrophysics::High Energy Astrophysical Phenomena
Abstract

6 pags., 2 figs., 2 tabs., Spectroscopic factors of neutron-hole and proton-hole states in Sn131 and In131, respectively, were measured using one-nucleon removal reactions from doubly magic Sn132 at relativistic energies. For In131, a 2910(50)-keV γ ray was observed for the first time and tentatively assigned to a decay from a 5/2-state at 3275(50) keV to the known 1/2-level at 365 keV. The spectroscopic factors determined for this new excited state and three other single-hole states provide first evidence for a strong fragmentation of single-hole strength in Sn131 and In131. The experimental results are compared to theoretical calculations based on the relativistic particle-vibration coupling model and to experimental information for single-hole states in the stable doubly magic nucleus Pb208., We thank the staff of the RIKEN accelerator team for supplying a primary 238U beam with high intensity. This work was supported by the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P, the DFG via Sonderforschungsbereich SFB 1245, the GSI-TU Darmstadt cooperation agreement, the US-NSF Career Grants No. PHY-1654379 and No. PHY-1713857 and by INFN Italy. J. A. T. acknowledges support of the Science and Technology Facilities Council (UK) Grant No. ST/ L005314/1.

Published
2020

38. $g$ Factor of the $^{99}\mathrm{Zr}$ ($7/{2}^{+}$) Isomer: Monopole Evolution in the Shape-Coexisting Region

Author

Boulay, F., Simpson, G.S., Ichikawa, Y., Kisyov, S., Bucurescu, D., Takamine, A., Ahn, D.S., Asahi, K., Baba, H., Balabanski, D.L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Lozeva, R., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Tao, L.C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X.F., Daugas, J.M., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), 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), 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), and 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)

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

International audience; The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus Zr99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=7/2+, with a half-life of T1/2=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a U238 primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μN was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd5/2 composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution.

Published
2020

39. $\beta$-Decay Half-Lives of 55 Neutron-Rich Isotopes beyond the N=82 Shell Gap

Author

Wu, J., Nishimura, S., Möller, P., Mumpower, M.R., Lozeva, R., Moon, C.B., Odahara, A., Baba, H., Browne, F., Daido, R., Doornenbal, P., Fang, Y.F., Haroon, M., Isobe, T., Jung, H.S., Lorusso, G., Moon, B., Patel, Z., Rice, S., Sakurai, H., Shimizu, Y., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Xu, Z.Y., Yagi, A., Yokoyama, R., Ahn, D.S., Garrote, F.L. Bello, Daugas, J.M., Didierjean, F., Fukuda, N., Inabe, N., Ishigaki, T., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kurz, N., Kwon, K.Y., Morimoto, S., Murai, D., Nishibata, H., Schaffner, H., Sprouse, T.M., Suzuki, H., Takeda, H., Tanaka, M., Tshoo, K., Wakabayashi, Y., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; The $\beta$-decay half-lives of 55 neutron-rich nuclei $^{134-139}$Sn, $^{134-142}$Sb, $^{137-144}$Te, $^{140-146}$I, $^{142-148}$Xe, $^{145-151}$Cs, $^{148-153}$Ba, $^{151-155}$La were measured at the Radioactive Isotope Beam Factory (RIBF) employing the projectile fission fragments of $^{238}$U. The nuclear level structure, which relates to deformation, has a large effect on the half-lives. The impact of newly-measured half-lives on modeling the astrophysical origin of the heavy elements is studied in the context of $r$ process nucleosynthesis. For a wide variety of astrophysical conditions, including those in which fission recycling occurs, the half-lives have an important local impact on the second ($A$ $\approx$ 130) peak.

Published
2020

40. Spectroscopy of $^{99}\mathrm{Cd}$ and $^{101}\mathrm{In}$ from ${\beta}$ decays of $^{99}\mathrm{In}$ and $^{101}\mathrm{Sn}$

Author

PARK, J., KRÜCKEN, R., BLAZHEV, A., LUBOS, D., GERNHÄUSER, R., LEWITOWICZ, M., NISHIMURA, S., AHN, D.S., BABA, H., BLANK, B., BOUTACHKOV, P., BROWNE, F., ČELIKOVIĆ, I., DE FRANCE, G., DOORNENBAL, P., FAESTERMANN, T., FANG, Y., FUKUDA, N., GIOVINAZZO, J., GOEL, N., GÓRSKA, M., GRAWE, H., ILIEVA, S., INABE, N., ISOBE, T., JUNGCLAUS, A., KAMEDA, D., KIM, G.D., KIM, Y.K., KOJOUHAROV, I., KUBO, T., KURZ, N., KWON, Y.K., LORUSSO, G., MOSCHNER, K., MURAI, D., NISHIZUKA, I., PATEL, Z., RAJABALI, M.M., RICE, S., SAKURAI, H., SCHAFFNER, H., SHIMIZU, Y., SINCLAIR, L., SÖDERSTRÖM, P.A., STEIGER, K., SUMIKAMA, T., SUZUKI, H., TAKEDA, H., WANG, Z., WATANABE, H., WU, J., XU, Z.Y., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), TRIUMF, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure
Abstract

International audience; We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions. (APS)

Published
2020

41. Spectroscopy of Cd 99 and in 101 from β decays of in 99 and Sn 101

Author

Park, J., Krücken, R., Blazhev, A., Lubos, D., Gernhäuser, R., Lewitowicz, M., Nishimura, S., Ahn, D.S., Baba, H., Blank, B., Boutachkov, P., Browne, F., Celikovic, I., De France, G., Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Górska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, Andrea, Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y.K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M.M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Söderström, P.A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministry of Education, Science and Technology (South Korea), National Research Foundation of Korea, Japan Society for the Promotion of Science, German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Natural Sciences and Engineering Research Council of Canada, and French-Japanese International Associated Laboratory for Nuclear Structure Problems

Abstract

11 pags., 10 figs., 3 tabs., We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions., The authors would like to thank the personnel at the RIKEN Nishina Center for providing the exotic radioactive isotope beam with record intensities. This experiment was performed at RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. We acknowledge the EUROBALL Owners Committee for loaning the germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors of EURICA. Support for the WAS3ABi setup was provided by the Rare Isotope Science Project, funded by the Ministry of Education, Science and Technology (MEST) and National Research Foundation (NRF) of Korea, as well as KAKENHI (Grant No. 25247045) of Japan Society for the Promotion of Science (JSPS). This work was supported by the Institute for Basic Science (IBS-R031-D1). The authors acknowledge also the support of the DFG cluster of excellence “Origin and Structure of the Universe,” German BMBF under Contracts No. 05P15PKFNA and No. 05P19PKFNA, and the Spanish Ministerio de Economía y Competitividad via Project No. FPA2017-84756-C4-2-P. Part of the research was funded by the Natural Sciences and Engineering Research Council (NSERC) of Canada and also supported by FJNSP LIA (French-Japanese International Associated Laboratory for Nuclear Structure Problems)

Published
2020

42. Experimental study of 4n with 8He(p,2p) reaction

Author

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

Abstract

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

Published
2020

43. 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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44. Experimental study of 4 n with 8He(p,2p) reaction

Author

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

Published
2020
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45. Two-proton Radioactivity: the Interesting Case of \(^{67}\)Kr and Further Studies

Author

Giovinazzo, J., primary, Goigoux, T., additional, Blank, B., additional, Ascher, P., additional, Gerbaux, M., additional, Grévy, S., additional, Kurtukian-Nieto, T., additional, Magron, C., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Kiss, G.G., additional, Kubo, T., additional, Kubono, S., additional, Nishimura, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Sidong, C., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Vi, P., additional, Wu, J., additional, Ahn, D.S., additional, Agramunt, J., additional, Algora, A., additional, Guadilla, V., additional, Montaner-Piza, A., additional, Morales, A.I., additional, Orrigo, S.E.A., additional, Rubio, B., additional, Fujita, Y., additional, Tanaka, M., additional, Gelletly, W., additional, Aguilera, P., additional, Molina, F., additional, Diel, F., additional, Lubos, D., additional, de Angelis, G., additional, Napoli, D., additional, Borcea, C., additional, Boso, A., additional, Cakirli, R.B., additional, Ganioglu, E., additional, Chiba, J., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Wimmer, K., additional, de France, G., additional, Go, S., additional, and Brown, B.A., additional

Published
2020
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46. Studying the Exotic Decay \(^{70}\)Kr \(\rightarrow {}^{70}\)Br

Author

Vitéz-Sveiczer, A., primary, Algora, A., additional, Morales, A.I., additional, Rubio, B., additional, Kiss, G.G., additional, de Angelis, G., additional, Recchia, F., additional, Nishimura, S., additional, Agramunt, J., additional, Guadilla, V., additional, Montaner-Pizá, A., additional, Orrigo, S.E.A., additional, Horváth, A., additional, Napoli, D., additional, Lenzi, S., additional, Boso, A., additional, Phong, V.H., additional, Wu, J., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Ahn, D.S., additional, Baba, H., additional, Doornebal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kubo, T., additional, Kubono, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Chen, S., additional, Blank, B., additional, Ascher, P., additional, Gerbaux, M., additional, Goigoux, T., additional, Giovinazzo, J., additional, Grévy, S., additional, Kurtukián Nieto, T., additional, Magron, C., additional, Gelletly, W., additional, Dombrádi, Zs., additional, Fujita, Y., additional, Tanaka, M., additional, Aguilera, P., additional, Molina, F., additional, Eberth, J., additional, Diel, F., additional, Lubos, D., additional, Borcea, C., additional, Ganioglu, E., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Korten, W., additional, de France, G., additional, Davies, P., additional, Liu, J., additional, Lee, J., additional, Lokotko, T., additional, Kojouharov, I., additional, Kurz, N., additional, and Shaffner, H., additional

Published
2020
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47. First success of RI-beam separation and particle identification for nuclei with atomic number Z>82 at RIKEN RI beam factory

Author

Sumikama, T., primary, Kubo, T., additional, Fukuda, N., additional, Ahn, D.S., additional, Takeda, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Inabe, N., additional, Murai, D., additional, Sato, H., additional, Kusaka, K., additional, Yanagisawa, Y., additional, Ohtake, M., additional, and Yoshida, K., additional

Published
2020
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48. 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

49. 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

50. Strong one-neutron emission from two-neutron unbound states in β decays of the r -process nuclei Ga 86,87

Author

Yokoyama, R., Grzywacz, R., Rasco, B. C., Brewer, N., Rykaczewski, K. P., Dillmann, I., Taín, José Luis, Nishimura, S., Ahn, D.S., Algora, Alejandro, Allmond, J. M., Agramunt, Jorge, Baba, H., Bae, S., Bruno, C. G., Caballero-Folch, R., Calvino, F., Coleman-Smith, P. J., Cortés, Guillem, Davinson, T., Domingo Pardo, César, Estrade, A., Fukuda, N., Go, S., Griffin, C.J., Ha, J., Hall, O., Harkness-Brennan, L.J., Heideman, J., Isobe, T., Kahl, D., Karny, M., Kawano, T., Khiem, L. H., King, T.T., Kiss, G.G., Korgul, A., Kubono, S., Labiche, M., Lazarus, I., Liang, J., Liu, J., Lorusso, G., Madurga, Miguel, Matsui, K., Miernik, K., Montes, F., Morales, Ana Isabel, Morrall, P., Rubio, Berta, Tarifeño-Saldivia, A., Tolosa-Delgado, A., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

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

β-delayed one-neutron and two-neutron branching ratios (P1n and P2n) have been measured in the decay of A=84 to 87 Ga isotopes at the Radioactive-Isotope Beam Factory (RIBF) at the RIKEN Nishina Center using a high-efficiency array of He3 neutron counters (BRIKEN). Two-neutron emission was observed in the decay of Ga84,85,87 for the first time and the branching ratios were measured to be P2n=1.6(2)%,1.3(2)%, and 10.2(28)stat(5)sys%, respectively. One-neutron branching ratio of Ga87(P1n=81(9)stat(8)sys%) and half-life of 29(4) ms were measured for the first time. The branching ratios of Ga86 were also measured to be P1n=74(2)stat(8)sys% and 16.2(9)stat(6)sys% with better precision than a previous study. The observation that P1n>P2n for both Ga86,87 was unexpected and is interpreted as a signature of dominating one-neutron emission from the two-neutron unbound excited states in Ge86,87. In order to interpret the experimental results, shell-model and Hauser-Feshbach statistical model calculations of delayed particle and γ-ray emission probabilities were performed. This model framework reproduces the experimental results. The shell model alone predicts P2n significantly larger than P1n for the Ga87 decay, and it is necessary to invoke a statistical description to successfully explain the observation that P1n>P2n. Our new results demonstrate the relevance and importance of a statistical description of neutron emission for the prediction of the decay properties of multineutron emitters and that it must be included in the r-process modeling.

Published
2019

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