Interpretation of metastable states in the N> 70 Zr region

F. Browne; A. M. Bruce; T. Sumikama; I. Nishizuka; S. Nishimura; P. Doornenbal; J. G. Li; G. Lorusso; P. A. Söderström; P. M. Walker; H. Watanabe; F. R. Xu; R. Daido; Z. Patel; S. Rice; L. Sinclair; J. Wu; Z. Y. Xu; A. Yagi; H. Baba; N. Chiga; R. Carroll; F. Didierjean; Y. Fang; N. Fukuda; G. Gey; E. Ideguchi; N. Inabe; T. Isobe; D. Kameda; I. Kojouharov; N. Kurz; T. Kubo; S. Lalkovski; Z. Li; R. Lozeva; N. Nishibata; A. Odahara; Zs Podolyák; P. H. Regan; O. J. Roberts; H. Sakurai; H. Schaffner; G. S. Simpson; H. Suzuki; H. Takeda; M. Tanaka; J. Taprogge; V. Werner; O. Wieland

doi:10.1140/epja/s10050-023-01103-7

Interpretation of metastable states in the N> 70 Zr region

F. Browne, A. M. Bruce, T. Sumikama, I. Nishizuka, S. Nishimura, P. Doornenbal, J. G. Li, G. Lorusso, P. A. Söderström, P. M. Walker, H. Watanabe, F. R. Xu, R. Daido, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, A. Yagi, H. BabaN. Chiga, R. Carroll, F. Didierjean, Y. Fang, N. Fukuda, G. Gey, E. Ideguchi, N. Inabe, T. Isobe, D. Kameda, I. Kojouharov, N. Kurz, T. Kubo, S. Lalkovski, Z. Li, R. Lozeva, N. Nishibata, A. Odahara, Zs Podolyák, P. H. Regan, O. J. Roberts, H. Sakurai, H. Schaffner, G. S. Simpson, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, V. Werner, O. Wieland

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

Abstract

Isomeric states were observed in nuclei produced in an experiment at the RIKEN Nishina Center Radioactive Isotope Beam Factory following the in-flight fission of a 345 MeV/nucleon ²³⁸ U beam. Isomers reported in nuclei spanning a predicted prolate-oblate shape change boundary, ¹¹¹ Zr (E=283.1 keV; τ= 0.326 (63) μ s), ¹¹² Nb (E= 44.2 keV; τ= 0.094 (26) μ s), ¹¹³ Nb (E= 135.4 keV; τ= 0.846 (80) μ s), and ¹¹⁵ Mo (E= 198.6 keV; τ= 63 (4) μ s), are compared to potential-energy surface calculations which gave a selection of low-lying configurations for each nucleus. Tentative assignments of ground and excited states were made based on energy similarities to the calculations, reduced transition probabilities of the decays, and constraints of transition multipolarities from γ -ray coincidence measurements. These assignments are suggestive of significant deformation being persistent for N> 70 in this region. In addition, isomers in ¹⁰⁸ Nb, ¹⁰⁹ Nb, ¹¹³ Tc, ¹¹⁷ Ru, ¹¹⁹ Ru, ¹²⁰ Rh, and ¹²² Rh, not spanning the prolate-oblate transition discussed, are presented.

Original language	English
Article number	199 (2023)
Journal	European Physical Journal A
Volume	59
Issue number	9
DOIs	https://doi.org/10.1140/epja/s10050-023-01103-7
Publication status	Published - 8 Sept 2023

Bibliographical note

Funding Information:
This work was supported by JSPS KAKENHI Grant nos. 26800117 and 25247045. UK authors were supported by STFC Grant nos. ST/J000132/1, ST/J000051/1 and ST/K502431/1. P.H.R. acknowledges support from the UK National Measurement Office. P.-A.S. was financed by JSPS Grant no. 23 01752 and the RIKEN Foreign Postdoctoral Researcher Program. V.W. was supported by DOE Grant no. DE-FG02-91ER-40609 and the German BMBF Grant No. 05P12RDFN8. J.T. was financed by Spanish Ministerio de Ciencia e Innovación under Contract Nos. FPA2009-13377-C02 and FPA2011-29854-C04. J.G.L and F.R.X acknowledge the National Natural Science Foundation of China under Grants no. 12205340, 11835001, 11921006 and 12035001. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors.

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.

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10.1140/epja/s10050-023-01103-7

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Browne, F., Bruce, A. M., Sumikama, T., Nishizuka, I., Nishimura, S., Doornenbal, P., Li, J. G., Lorusso, G., Söderström, P. A., Walker, P. M., Watanabe, H., Xu, F. R., Daido, R., Patel, Z., Rice, S., Sinclair, L., Wu, J., Xu, Z. Y., Yagi, A., ... Wieland, O. (2023). Interpretation of metastable states in the N> 70 Zr region. European Physical Journal A, 59(9), Article 199 (2023). https://doi.org/10.1140/epja/s10050-023-01103-7

@article{d9bd575c088d409f985f836e1bfe7405,

title = "Interpretation of metastable states in the N> 70 Zr region",

abstract = "Isomeric states were observed in nuclei produced in an experiment at the RIKEN Nishina Center Radioactive Isotope Beam Factory following the in-flight fission of a 345 MeV/nucleon 238 U beam. Isomers reported in nuclei spanning a predicted prolate-oblate shape change boundary, 111 Zr (E=283.1 keV; τ= 0.326 (63) μ s), 112 Nb (E= 44.2 keV; τ= 0.094 (26) μ s), 113 Nb (E= 135.4 keV; τ= 0.846 (80) μ s), and 115 Mo (E= 198.6 keV; τ= 63 (4) μ s), are compared to potential-energy surface calculations which gave a selection of low-lying configurations for each nucleus. Tentative assignments of ground and excited states were made based on energy similarities to the calculations, reduced transition probabilities of the decays, and constraints of transition multipolarities from γ -ray coincidence measurements. These assignments are suggestive of significant deformation being persistent for N> 70 in this region. In addition, isomers in 108 Nb, 109 Nb, 113 Tc, 117 Ru, 119 Ru, 120 Rh, and 122 Rh, not spanning the prolate-oblate transition discussed, are presented.",

author = "F. Browne and Bruce, {A. M.} and T. Sumikama and I. Nishizuka and S. Nishimura and P. Doornenbal and Li, {J. G.} and G. Lorusso and S{\"o}derstr{\"o}m, {P. A.} and Walker, {P. M.} and H. Watanabe and Xu, {F. R.} and R. Daido and Z. Patel and S. Rice and L. Sinclair and J. Wu and Xu, {Z. Y.} and A. Yagi and H. Baba and N. Chiga and R. Carroll and F. Didierjean and Y. Fang and N. Fukuda and G. Gey and E. Ideguchi and N. Inabe and T. Isobe and D. Kameda and I. Kojouharov and N. Kurz and T. Kubo and S. Lalkovski and Z. Li and R. Lozeva and N. Nishibata and A. Odahara and Zs Podoly{\'a}k and Regan, {P. H.} and Roberts, {O. J.} and H. Sakurai and H. Schaffner and Simpson, {G. S.} and H. Suzuki and H. Takeda and M. Tanaka and J. Taprogge and V. Werner and O. Wieland",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant nos. 26800117 and 25247045. UK authors were supported by STFC Grant nos. ST/J000132/1, ST/J000051/1 and ST/K502431/1. P.H.R. acknowledges support from the UK National Measurement Office. P.-A.S. was financed by JSPS Grant no. 23 01752 and the RIKEN Foreign Postdoctoral Researcher Program. V.W. was supported by DOE Grant no. DE-FG02-91ER-40609 and the German BMBF Grant No. 05P12RDFN8. J.T. was financed by Spanish Ministerio de Ciencia e Innovaci{\'o}n under Contract Nos. FPA2009-13377-C02 and FPA2011-29854-C04. J.G.L and F.R.X acknowledge the National Natural Science Foundation of China under Grants no. 12205340, 11835001, 11921006 and 12035001. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. Publisher Copyright: {\textcopyright} 2023, The Author(s), under exclusive licence to Societ{\`a} Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.",

year = "2023",

month = sep,

day = "8",

doi = "10.1140/epja/s10050-023-01103-7",

language = "English",

volume = "59",

journal = "European Physical Journal A",

issn = "1434-6001",

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Browne, F, Bruce, AM, Sumikama, T, Nishizuka, I, Nishimura, S, Doornenbal, P, Li, JG, Lorusso, G, Söderström, PA, Walker, PM, Watanabe, H, Xu, FR, Daido, R, Patel, Z, Rice, S, Sinclair, L, Wu, J, Xu, ZY, Yagi, A, Baba, H, Chiga, N, Carroll, R, Didierjean, F, Fang, Y, Fukuda, N, Gey, G, Ideguchi, E, Inabe, N, Isobe, T, Kameda, D, Kojouharov, I, Kurz, N, Kubo, T, Lalkovski, S, Li, Z, Lozeva, R, Nishibata, N, Odahara, A, Podolyák, Z, Regan, PH, Roberts, OJ, Sakurai, H, Schaffner, H, Simpson, GS, Suzuki, H, Takeda, H, Tanaka, M, Taprogge, J, Werner, V & Wieland, O 2023, 'Interpretation of metastable states in the N> 70 Zr region', European Physical Journal A, vol. 59, no. 9, 199 (2023). https://doi.org/10.1140/epja/s10050-023-01103-7

TY - JOUR

T1 - Interpretation of metastable states in the N> 70 Zr region

AU - Browne, F.

AU - Bruce, A. M.

AU - Sumikama, T.

AU - Nishizuka, I.

AU - Nishimura, S.

AU - Doornenbal, P.

AU - Li, J. G.

AU - Lorusso, G.

AU - Söderström, P. A.

AU - Walker, P. M.

AU - Watanabe, H.

AU - Xu, F. R.

AU - Daido, R.

AU - Patel, Z.

AU - Rice, S.

AU - Sinclair, L.

AU - Wu, J.

AU - Xu, Z. Y.

AU - Yagi, A.

AU - Baba, H.

AU - Chiga, N.

AU - Carroll, R.

AU - Didierjean, F.

AU - Fang, Y.

AU - Fukuda, N.

AU - Gey, G.

AU - Ideguchi, E.

AU - Inabe, N.

AU - Isobe, T.

AU - Kameda, D.

AU - Kojouharov, I.

AU - Kurz, N.

AU - Kubo, T.

AU - Lalkovski, S.

AU - Li, Z.

AU - Lozeva, R.

AU - Nishibata, N.

AU - Odahara, A.

AU - Podolyák, Zs

AU - Regan, P. H.

AU - Roberts, O. J.

AU - Sakurai, H.

AU - Schaffner, H.

AU - Simpson, G. S.

AU - Suzuki, H.

AU - Takeda, H.

AU - Tanaka, M.

AU - Taprogge, J.

AU - Werner, V.

AU - Wieland, O.

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant nos. 26800117 and 25247045. UK authors were supported by STFC Grant nos. ST/J000132/1, ST/J000051/1 and ST/K502431/1. P.H.R. acknowledges support from the UK National Measurement Office. P.-A.S. was financed by JSPS Grant no. 23 01752 and the RIKEN Foreign Postdoctoral Researcher Program. V.W. was supported by DOE Grant no. DE-FG02-91ER-40609 and the German BMBF Grant No. 05P12RDFN8. J.T. was financed by Spanish Ministerio de Ciencia e Innovación under Contract Nos. FPA2009-13377-C02 and FPA2011-29854-C04. J.G.L and F.R.X acknowledge the National Natural Science Foundation of China under Grants no. 12205340, 11835001, 11921006 and 12035001. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. Publisher Copyright: © 2023, The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2023/9/8

Y1 - 2023/9/8

N2 - Isomeric states were observed in nuclei produced in an experiment at the RIKEN Nishina Center Radioactive Isotope Beam Factory following the in-flight fission of a 345 MeV/nucleon 238 U beam. Isomers reported in nuclei spanning a predicted prolate-oblate shape change boundary, 111 Zr (E=283.1 keV; τ= 0.326 (63) μ s), 112 Nb (E= 44.2 keV; τ= 0.094 (26) μ s), 113 Nb (E= 135.4 keV; τ= 0.846 (80) μ s), and 115 Mo (E= 198.6 keV; τ= 63 (4) μ s), are compared to potential-energy surface calculations which gave a selection of low-lying configurations for each nucleus. Tentative assignments of ground and excited states were made based on energy similarities to the calculations, reduced transition probabilities of the decays, and constraints of transition multipolarities from γ -ray coincidence measurements. These assignments are suggestive of significant deformation being persistent for N> 70 in this region. In addition, isomers in 108 Nb, 109 Nb, 113 Tc, 117 Ru, 119 Ru, 120 Rh, and 122 Rh, not spanning the prolate-oblate transition discussed, are presented.

AB - Isomeric states were observed in nuclei produced in an experiment at the RIKEN Nishina Center Radioactive Isotope Beam Factory following the in-flight fission of a 345 MeV/nucleon 238 U beam. Isomers reported in nuclei spanning a predicted prolate-oblate shape change boundary, 111 Zr (E=283.1 keV; τ= 0.326 (63) μ s), 112 Nb (E= 44.2 keV; τ= 0.094 (26) μ s), 113 Nb (E= 135.4 keV; τ= 0.846 (80) μ s), and 115 Mo (E= 198.6 keV; τ= 63 (4) μ s), are compared to potential-energy surface calculations which gave a selection of low-lying configurations for each nucleus. Tentative assignments of ground and excited states were made based on energy similarities to the calculations, reduced transition probabilities of the decays, and constraints of transition multipolarities from γ -ray coincidence measurements. These assignments are suggestive of significant deformation being persistent for N> 70 in this region. In addition, isomers in 108 Nb, 109 Nb, 113 Tc, 117 Ru, 119 Ru, 120 Rh, and 122 Rh, not spanning the prolate-oblate transition discussed, are presented.

UR - http://www.scopus.com/inward/record.url?scp=85170375116&partnerID=8YFLogxK

U2 - 10.1140/epja/s10050-023-01103-7

DO - 10.1140/epja/s10050-023-01103-7

M3 - Article

AN - SCOPUS:85170375116

SN - 1434-6001

VL - 59

JO - European Physical Journal A

JF - European Physical Journal A

IS - 9

M1 - 199 (2023)

ER -

Interpretation of metastable states in the N> 70 Zr region

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