Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon 238U Beam

Y. Shimizu; K. P. Rykaczewski; N. Fukuda; N. T. Brewer; I. Dillmann; R. K. Grzywacz; S. Nishimura; B. C. Rasco; J. L. Tain; H. Suzuki; H. Takeda; D. S. Ahn; T. Sumikama; N. Inabe; K. Yoshida; H. Ueno; S. Michimasa; 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; S. Go; C. J. Griffin; J. Ha; O. Hall; L. J. Harkness-Brennan; J. Heideman; T. Isobe; D. Kahl; M. Karny; 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; J. Simpson; M. Singh; D. W. Stracener; A. Tarifeño-Saldivia; S. L. Thomas; A. Tolosa-Delgado; M. Wolinska-Cichocka; P. J. Woods; X. X. Xu; R. Yokoyama

doi:10.1093/ptep/ptag036

Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon ²³⁸U Beam

Y. Shimizu
, K. P. Rykaczewski
, N. Fukuda
, N. T. Brewer
, I. Dillmann
, R. K. Grzywacz
, S. Nishimura
, B. C. Rasco
, J. L. Tain
, H. Suzuki
, H. Takeda
, D. S. Ahn
, T. Sumikama
, N. Inabe
, K. Yoshida
, H. Ueno
, S. Michimasa
, 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, S. Go, C. J. Griffin, J. Ha, O. Hall, L. J. Harkness-Brennan, J. Heideman, T. Isobe, D. Kahl, M. Karny, 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, J. Simpson, M. Singh, D. W. Stracener, A. Tarifeño-Saldivia, S. L. Thomas, A. Tolosa-Delgado, M. Wolinska-Cichocka, P. J. Woods, X. X. Xu, R. Yokoyama

Research output: Contribution to journal › Article › peer-review

Abstract

A search for new neutron-rich isotopes beyond and was performed using a 345 MeV/nucleon U beam at RI Beam Factory in RIKEN Nishina Center. The BigRIPS separator and state-of-the-art radiation detectors were used to efficiently separate and identify the produced nuclei. For the first time, we have observed and determined the production cross sections for eight neutron-rich isotopes Cr, Mn, Fe, Co, Cu, and Ga. This study broadens our understanding of nuclear existence and paves the way for investigating the properties of neutron-rich medium-mass nuclei.

Original language	English
Article number	033D06
Journal	Progress of Theoretical and Experimental Physics
Volume	2026
Issue number	3
DOIs	https://doi.org/10.1093/ptep/ptag036
State	Published - Mar 1 2026

Funding

The US Department of Energy (DOE), Office of Science supported co-authors under the contracts DE-AC05-00OR22725 (ORNL), DE-FG02-96ER40983 (UTK), and DE-SC0016988 (TTU). S.N. acknowledges the JSPS KAKENHI (Grants No. 17H06090, No. 20H05648, No. 22H04946, No. 25H01273) and the RIKEN programs (r-EMU and RiNA-Net). This work was supported by Spanish grants MINECO FPA2014-52823-C2-1-P, MICINN/AEI FPA2017-83946-C2-1-P, and MICINN/AEI PID2019–104714 GB-C21, co-funded by the European Regional Development Fund. This work was partially supported by Generalitat Valenciana PROMETEO/2019/007. G.K.K.’s work was supported by NKFIH (K147010). A.K.’s work was supported by the Polish National Science Center under Grant No. 2020/39/B/ST2/02346. A.I.M.’s work was supported by Generalitat Valenciana (CISEJI/2022/25), Spanish Ministerio de Ciencia, Innovacion y Universidades (CAS22/00114, CNS2023-144871, and PID2023-150056NB-C41). This work was supported by European Union’s HORIZON Programme under the Grant Agreement No. 101212216 (RADESO). This work was supported by the United Kingdom Science and Technology Facilities Council (STFC) through grant numbers ST/P004598/1, ST/V001027/1, and ST/Y000242/1. M.W. was supported by the Polish NCN project Miniatura No. 2017/01/X/ST2/01144. Acknowledgements

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Shimizu, Y., Rykaczewski, K. P., Fukuda, N., Brewer, N. T., Dillmann, I., Grzywacz, R. K., Nishimura, S., Rasco, B. C., Tain, J. L., Suzuki, H., Takeda, H., Ahn, D. S., Sumikama, T., Inabe, N., Yoshida, K., Ueno, H., Michimasa, S., Algora, A., Allmond, J. M., ... Yokoyama, R. (2026). Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon ²³⁸U Beam. Progress of Theoretical and Experimental Physics, 2026(3), Article 033D06. https://doi.org/10.1093/ptep/ptag036

@article{ab629f9d1078466d880fd0b978a7c77b,

title = "Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon 238U Beam",

abstract = "A search for new neutron-rich isotopes beyond and was performed using a 345 MeV/nucleon U beam at RI Beam Factory in RIKEN Nishina Center. The BigRIPS separator and state-of-the-art radiation detectors were used to efficiently separate and identify the produced nuclei. For the first time, we have observed and determined the production cross sections for eight neutron-rich isotopes Cr, Mn, Fe, Co, Cu, and Ga. This study broadens our understanding of nuclear existence and paves the way for investigating the properties of neutron-rich medium-mass nuclei.",

author = "Y. Shimizu and Rykaczewski, \{K. P.\} and N. Fukuda and Brewer, \{N. T.\} and I. Dillmann and Grzywacz, \{R. K.\} and S. Nishimura and Rasco, \{B. C.\} and Tain, \{J. L.\} and H. Suzuki and H. Takeda and Ahn, \{D. S.\} and T. Sumikama and N. Inabe and K. Yoshida and H. Ueno and S. Michimasa and A. Algora and Allmond, \{J. M.\} and J. Agramunt and H. Baba and S. Bae and Bruno, \{C. G.\} and R. Caballero-Folch and F. Calvino and Coleman-Smith, \{P. J.\} and G. Cortes and T. Davinson and C. Domingo-Pardo and A. Estrade and S. Go and Griffin, \{C. J.\} and J. Ha and O. Hall and Harkness-Brennan, \{L. J.\} and J. Heideman and T. Isobe and D. Kahl and M. Karny and Khiem, \{L. H.\} and King, \{T. T.\} and Kiss, \{G. G.\} and A. Korgul and S. Kubono and M. Labiche and I. Lazarus and J. Liang and J. Liu and G. Lorusso and M. Madurga and K. Matsui and K. Miernik and F. Montes and Morales, \{A. I.\} and P. Morrall and N. Nepal and Page, \{R. D.\} and Phong, \{V. H.\} and M. Piersa-Si{\l}kowska and M. Prydderch and Pucknell, \{V. F.E.\} and Rajabali, \{M. M.\} and B. Rubio and Y. Saito and H. Sakurai and J. Simpson and M. Singh and Stracener, \{D. W.\} and A. Tarife{\~n}o-Saldivia and Thomas, \{S. L.\} and A. Tolosa-Delgado and M. Wolinska-Cichocka and Woods, \{P. J.\} and Xu, \{X. X.\} and R. Yokoyama",

note = "Publisher Copyright: {\textcopyright} 2026 The Author(s).",

year = "2026",

month = mar,

day = "1",

doi = "10.1093/ptep/ptag036",

language = "English",

volume = "2026",

journal = "Progress of Theoretical and Experimental Physics",

issn = "2050-3911",

publisher = "Oxford University Press",

number = "3",

}

Shimizu, Y, Rykaczewski, KP, Fukuda, N, Brewer, NT, Dillmann, I, Grzywacz, RK, Nishimura, S, Rasco, BC, Tain, JL, Suzuki, H, Takeda, H, Ahn, DS, Sumikama, T, Inabe, N, Yoshida, K, Ueno, H, Michimasa, S, Algora, A, Allmond, JM, Agramunt, J, Baba, H, Bae, S, Bruno, CG, Caballero-Folch, R, Calvino, F, Coleman-Smith, PJ, Cortes, G, Davinson, T, Domingo-Pardo, C, Estrade, A, Go, S, Griffin, CJ, Ha, J, Hall, O, Harkness-Brennan, LJ, Heideman, J, Isobe, T, Kahl, D, Karny, M, Khiem, LH, King, TT, Kiss, GG, Korgul, A, Kubono, S, Labiche, M, Lazarus, I, Liang, J, Liu, J, Lorusso, G, Madurga, M, Matsui, K, Miernik, K, Montes, F, Morales, AI, Morrall, P, Nepal, N, Page, RD, Phong, VH, Piersa-Siłkowska, M, Prydderch, M, Pucknell, VFE, Rajabali, MM, Rubio, B, Saito, Y, Sakurai, H, Simpson, J, Singh, M, Stracener, DW, Tarifeño-Saldivia, A, Thomas, SL, Tolosa-Delgado, A, Wolinska-Cichocka, M, Woods, PJ, Xu, XX & Yokoyama, R 2026, 'Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon ²³⁸U Beam', Progress of Theoretical and Experimental Physics, vol. 2026, no. 3, 033D06. https://doi.org/10.1093/ptep/ptag036

TY - JOUR

T1 - Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon 238U Beam

AU - Shimizu, Y.

AU - Rykaczewski, K. P.

AU - Fukuda, N.

AU - Brewer, N. T.

AU - Dillmann, I.

AU - Grzywacz, R. K.

AU - Nishimura, S.

AU - Rasco, B. C.

AU - Tain, J. L.

AU - Suzuki, H.

AU - Takeda, H.

AU - Ahn, D. S.

AU - Sumikama, T.

AU - Inabe, N.

AU - Yoshida, K.

AU - Ueno, H.

AU - Michimasa, S.

AU - Algora, A.

AU - Allmond, J. M.

AU - Agramunt, J.

AU - Baba, H.

AU - Bae, S.

AU - Bruno, C. G.

AU - Caballero-Folch, R.

AU - Calvino, F.

AU - Coleman-Smith, P. J.

AU - Cortes, G.

AU - Davinson, T.

AU - Domingo-Pardo, C.

AU - Estrade, A.

AU - Go, S.

AU - Griffin, C. J.

AU - Ha, J.

AU - Hall, O.

AU - Harkness-Brennan, L. J.

AU - Heideman, J.

AU - Isobe, T.

AU - Kahl, D.

AU - Karny, M.

AU - Khiem, L. H.

AU - King, T. T.

AU - Kiss, G. G.

AU - Korgul, A.

AU - Kubono, S.

AU - Labiche, M.

AU - Lazarus, I.

AU - Liang, J.

AU - Liu, J.

AU - Lorusso, G.

AU - Madurga, M.

AU - Matsui, K.

AU - Miernik, K.

AU - Montes, F.

AU - Morales, A. I.

AU - Morrall, P.

AU - Nepal, N.

AU - Page, R. D.

AU - Phong, V. H.

AU - Piersa-Siłkowska, M.

AU - Prydderch, M.

AU - Pucknell, V. F.E.

AU - Rajabali, M. M.

AU - Rubio, B.

AU - Saito, Y.

AU - Sakurai, H.

AU - Simpson, J.

AU - Singh, M.

AU - Stracener, D. W.

AU - Tarifeño-Saldivia, A.

AU - Thomas, S. L.

AU - Tolosa-Delgado, A.

AU - Wolinska-Cichocka, M.

AU - Woods, P. J.

AU - Xu, X. X.

AU - Yokoyama, R.

PY - 2026/3/1

Y1 - 2026/3/1

N2 - A search for new neutron-rich isotopes beyond and was performed using a 345 MeV/nucleon U beam at RI Beam Factory in RIKEN Nishina Center. The BigRIPS separator and state-of-the-art radiation detectors were used to efficiently separate and identify the produced nuclei. For the first time, we have observed and determined the production cross sections for eight neutron-rich isotopes Cr, Mn, Fe, Co, Cu, and Ga. This study broadens our understanding of nuclear existence and paves the way for investigating the properties of neutron-rich medium-mass nuclei.

AB - A search for new neutron-rich isotopes beyond and was performed using a 345 MeV/nucleon U beam at RI Beam Factory in RIKEN Nishina Center. The BigRIPS separator and state-of-the-art radiation detectors were used to efficiently separate and identify the produced nuclei. For the first time, we have observed and determined the production cross sections for eight neutron-rich isotopes Cr, Mn, Fe, Co, Cu, and Ga. This study broadens our understanding of nuclear existence and paves the way for investigating the properties of neutron-rich medium-mass nuclei.

UR - https://www.scopus.com/pages/publications/105033249843

U2 - 10.1093/ptep/ptag036

DO - 10.1093/ptep/ptag036

M3 - Article

AN - SCOPUS:105033249843

SN - 2050-3911

VL - 2026

JO - Progress of Theoretical and Experimental Physics

JF - Progress of Theoretical and Experimental Physics

IS - 3

M1 - 033D06

ER -

Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon ²³⁸U Beam

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