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

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

doi:10.1103/physrevc.103.064328

Title: Persistence of the Z = 28 shell gap in A = 75 isobars: Identification of a possible ( 1 / 2 – ) μ s isomer in Co 75 and β decay to Ni 75

Abstract

Here, the evolution of shell structure around doubly magic exotic nuclei is of great interest in nuclear physics and astrophysics. In the ‘southwest’ region of ⁷⁸Ni, the development of deformation might trigger a major shift in our understanding of explosive nucleosynthesis. To this end, new spectroscopic information on key close-lying nuclei is very valuable. We intend to measure the isomeric and β decay of ⁷⁵Co, with one-proton and two-neutron holes relative to 78Ni, to access new nuclear structure information in ⁷⁵Co and its β-decay daughters ⁷⁵Ni and ⁷⁴Ni. The nucleus ⁷⁵Co is produced in relativistic in-flight fission reactions of ²³⁸U at the Radioactive Ion Beam Factory in the RIKEN Nishina Center. Its isomeric and β decay are studied exploiting the BigRIPS and EURICA setups. We obtain partial β-decay spectra for ⁷⁵Ni and ⁷⁴Ni, and report a new isomeric transition in ⁷⁵Co. The energy [E_γ = 1914(2)keV] and half-life [t_1/2 = 13(6) μs] of the delayed γ ray lend support for the existence of a J^π = (1/2^–) isomeric state at 1914(2) keV. A comparison with PFSDG-U shell-model calculations provides a good account for the observed states in ⁷⁵Ni, but the first calculated 1/2^– level in ⁷⁵Co, a prolate K =more »« less

Authors:

^[1]; Morales, Ana I. ^[2]; Nishimura, S. ^[3]; Niikura, M. ^[4]; Poves, A. ^[5]; Xu, Z. Y. ^[6]; Lorusso, G. ^[3]; Browne, F. ^[7]; Doornenbal, P. ^[3]; Gey, G. ^[8]; Jung, H. -S. ^[9]; Li, Z. ^[10]; Söderström, P. -A. ^[11]; Sumikama, T. ^[12]; Taprogge, J. ^[13]; Vajta, Zs ^[14]; Watanabe, H. ^[15]; Wu, J. ^[16]; Yagi, A. ^[17]; Yoshinaga, K. ^[18] more »

Inst. de Física Corpuscular, Valencia (Spain); Inst. de Estructura de la Materia, Madrid (Spain)
Inst. de Física Corpuscular, Valencia (Spain)
RIKEN Nishina Center, Saitama (Japan)
Univ. of Tokyo (Japan)
Univ. Autónoma de Madrid (Spain)
Univ. of Tokyo (Japan); RIKEN Nishina Center, Saitama (Japan)
Univ. of Brighton (United Kingdom); RIKEN Nishina Center, Saitama (Japan)
Univ. Grenoble-Alpes (France); ILL (France); RIKEN Nishina Center, Saitama (Japan)
Univ. of Notre Dame, IN (United States)
Peking Univ., Beijing (China)
RIKEN Nishina Center, Saitama (Japan); Extreme Light Infrastructure-Nuclear Physics (ELI-NP) and Horia Hulubei National Inst. for Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele (Romania)
Tohoku Univ., Sendai (Japan)
Univ. Autónoma de Madrid (Spain); Inst. de Estructura de la Materia, Madrid (Spain); RIKEN Nishina Center, Saitama (Japan)
Inst. for Nuclear Research (Atomki), Debrecen (Hungary); RIKEN Nishina Center, Saitama (Japan)
Beihang Univ., Beijing (China)
Peking Univ., Beijing (China); RIKEN Nishina Center, Saitama (Japan)
Osaka Univ. (Japan)
Tokyo Univ. of Science, Chiba (Japan)
Univ. Paris-Saclay (France)
Univ. di Padova and INFN Sezione di Padova (Italy); Technische Univ. Darmstadt (Germany)
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
Univ. di Padova and INFN Sezione di Padova (Italy)
Istituto Nazionale di Fisica Nucleare, Legnaro (Italy)
Yale Univ., New Haven, CT (United States)
Univ. of Oslo (Norway)
Univ. Paris-Saclay, Orsay (France); RIKEN Nishina Center, Saitama (Japan)
Yale Univ., New Haven, CT (United States); Technische Universität Darmstadt (Germany)
Inst. for Nuclear Research (Atomki), Debrecen (Hungary)

Publication Date:: Mon Jun 28 00:00:00 EDT 2021

Research Org.:: Yale Univ., New Haven, CT (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1850007

Grant/Contract Number:: FG02-91ER40609

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. C

Additional Journal Information:: Journal Volume: 103; Journal Issue: 6; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Physics; Beta decay; Electromagnetic transitions; Energy levels & level densities; Isomer decays; Nuclear structure & decays; Rare & new isotopes; Shell model; 59 ≤ A ≤ 89

Citation Formats


                    Escrig, Samuel, Morales, Ana I., Nishimura, S., Niikura, M., Poves, A., Xu, Z. Y., Lorusso, G., Browne, F., Doornenbal, P., Gey, G., Jung, H. -S., Li, Z., Söderström, P. -A., Sumikama, T., Taprogge, J., Vajta, Zs, Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Baba, H., Franchoo, S., Isobe, T., John, P. R., Kojouharov, I., Kubono, S., Kurz, N., Matea, I., Matsui, K., Mengoni, D., Morfouace, P., Napoli, D. R., Naqvi, F., Nishibata, H., Odahara, A., Sahin, E., Sakurai, H., Schaffner, H., Stefan, I. G., Suzuki, D., Taniuchi, R., Werner, V., and Sohler, D. Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2–) μs isomer in Co75 and β decay to Ni75.  United States: N. p., 2021. 
Web.  doi:10.1103/physrevc.103.064328.

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                    Escrig, Samuel, Morales, Ana I., Nishimura, S., Niikura, M., Poves, A., Xu, Z. Y., Lorusso, G., Browne, F., Doornenbal, P., Gey, G., Jung, H. -S., Li, Z., Söderström, P. -A., Sumikama, T., Taprogge, J., Vajta, Zs, Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Baba, H., Franchoo, S., Isobe, T., John, P. R., Kojouharov, I., Kubono, S., Kurz, N., Matea, I., Matsui, K., Mengoni, D., Morfouace, P., Napoli, D. R., Naqvi, F., Nishibata, H., Odahara, A., Sahin, E., Sakurai, H., Schaffner, H., Stefan, I. G., Suzuki, D., Taniuchi, R., Werner, V., & Sohler, D. Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2–) μs isomer in Co75 and β decay to Ni75.  United States.  https://doi.org/10.1103/physrevc.103.064328

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                    Escrig, Samuel, Morales, Ana I., Nishimura, S., Niikura, M., Poves, A., Xu, Z. Y., Lorusso, G., Browne, F., Doornenbal, P., Gey, G., Jung, H. -S., Li, Z., Söderström, P. -A., Sumikama, T., Taprogge, J., Vajta, Zs, Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Baba, H., Franchoo, S., Isobe, T., John, P. R., Kojouharov, I., Kubono, S., Kurz, N., Matea, I., Matsui, K., Mengoni, D., Morfouace, P., Napoli, D. R., Naqvi, F., Nishibata, H., Odahara, A., Sahin, E., Sakurai, H., Schaffner, H., Stefan, I. G., Suzuki, D., Taniuchi, R., Werner, V., and Sohler, D. Mon .  
"Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2–) μs isomer in Co75 and β decay to Ni75".  United States.  https://doi.org/10.1103/physrevc.103.064328.  https://www.osti.gov/servlets/purl/1850007.

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@article{osti_1850007,

  title        = {Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2–) μs isomer in Co75 and β decay to Ni75},

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

  abstractNote = {Here, the evolution of shell structure around doubly magic exotic nuclei is of great interest in nuclear physics and astrophysics. In the ‘southwest’ region of 78Ni, the development of deformation might trigger a major shift in our understanding of explosive nucleosynthesis. To this end, new spectroscopic information on key close-lying nuclei is very valuable. We intend to measure the isomeric and β decay of 75Co, with one-proton and two-neutron holes relative to 78Ni, to access new nuclear structure information in 75Co and its β-decay daughters 75Ni and 74Ni. The nucleus 75Co is produced in relativistic in-flight fission reactions of 238U at the Radioactive Ion Beam Factory in the RIKEN Nishina Center. Its isomeric and β decay are studied exploiting the BigRIPS and EURICA setups. We obtain partial β-decay spectra for 75Ni and 74Ni, and report a new isomeric transition in 75Co. The energy [Eγ = 1914(2)keV] and half-life [t1/2 = 13(6) μs] of the delayed γ ray lend support for the existence of a Jπ = (1/2–) isomeric state at 1914(2) keV. A comparison with PFSDG-U shell-model calculations provides a good account for the observed states in 75Ni, but the first calculated 1/2– level in 75Co, a prolate K = 1/2 state, is predicted about 1 MeV below the observed (1/2–) level. The spherical-like structure of the lowest-lying excited states in 75Ni is proved. In the case of 75Co, the results suggest that the dominance of the spherical configurations over the deformed ones might be stronger than expected below 78Ni. Further experimental efforts to discern the nature of the Jπ = (1/2–) isomer are necessary.},

  doi          = {10.1103/physrevc.103.064328},

  journal      = {Physical Review. C},

  number       = 6,

  volume       = 103,

  place        = {United States},

  year         = {Mon Jun 28 00:00:00 EDT 2021},

  month        = {Mon Jun 28 00:00:00 EDT 2021}

}

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Title: Persistence of the Z = 28 shell gap in A = 75 isobars: Identification of a possible ( 1 / 2 – ) μ s isomer in Co 75 and β decay to Ni 75

Abstract

Citation Formats

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journal, October 2017

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journal, October 2012

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journal, August 2010

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journal, March 2020

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journal, June 2013

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journal, March 2012

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journal, January 2019

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journal, March 2010

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journal, March 2020

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journal, September 2020

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journal, January 2016

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journal, November 2016

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journal, May 2017

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journal, November 2020

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journal, January 2020

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journal, June 2017

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journal, October 2020

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journal, February 2008

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journal, January 2021

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journal, October 2016

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journal, March 1968

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journal, December 2013

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journal, June 2017

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journal, May 2019

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journal, October 2017

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journal, December 2015

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journal, July 2014