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Nuclear structure of 37, 38Si investigated by decay spectroscopy of 37, 38Al

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Abstract

We present a study on the β decays of the neutron-rich isotopes 37Al and 38Al, produced by projectile fragmentation of a 48Ca beam with an energy E = 345 A MeV at the RIKEN Nishina Center. The half-lives of 37Al and 38Al have been measured to 11.5(4)ms and 9.0(7)ms, respectively, using the CAITEN implantation and decay detector setup. The level schemes for 37Si and 38Si were deduced by employing γ-γ coincidence spectroscopy following the event-by-event identification of the implanted nuclei. Comparison to large scale nuclear shell model calculations allowed for a tentative assignment of spin and parity of the populated states. The data indicate that the classical shell gap at magic neutron number N = 28 between the νf 7/2 and νp 3/2 orbits gets reduced by 0.3 MeV in this region leading to low-energy states with intruder configuration in 37Si.

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Authors and Affiliations

  1. Physik Department E12, Technische Universität München, D-85748, Garching, Germany

    K. Steiger, R. Gernhäuser, T. Faestermann, C. Hinke & R. Krücken

  2. RIKEN Nishina Center, 2-1 Hirosawa, Wako, 351-0198, Saitama, Japan

    S. Nishimura, Z. Li, R. Chen, M. Kurata-Nishimura, G. Lorusso & H. Watanabe

  3. Department of Physics, Peking University, 100871, Beijing, China

    Z. Li

  4. Advanced Science Research Center, Japan Atomic Energy Agency, 319-1195, Tokai, Ibaraki, Japan

    Y. Utsuno

  5. Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan

    Y. Utsuno & N. Shimizu

  6. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, British Columbia, Canada

    R. Krücken

  7. Department of Physics and Astronomy, University of British Columbia, BC V6T 1Z1, Vancouver, BC, Canada

    R. Krücken

  8. Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, 278-8510, Chiba, Japan

    Y. Miyashita, K. Sugimoto & K. Yoshinaga

  9. Department of Physics, Tohoku University, Aoba, Sendai, 980-8578, Miyagi, Japan

    T. Sumikama

  10. International Research Center for Nuclei and Particles in the Cosmos, Beihang University, 100191, Beijing, China

    H. Watanabe

  11. School of Physics and Nuclear Energy Engineering, Beihang University, 100191, Beijing, China

    H. Watanabe

Authors
  1. K. Steiger
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  2. S. Nishimura
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  3. Z. Li
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  4. R. Gernhäuser
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  5. Y. Utsuno
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  6. R. Chen
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  7. T. Faestermann
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  8. C. Hinke
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  9. R. Krücken
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  10. M. Kurata-Nishimura
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  11. G. Lorusso
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  12. Y. Miyashita
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  14. K. Sugimoto
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  17. K. Yoshinaga
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Corresponding author

Correspondence to R. Gernhäuser.

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Communicated by Tohru Motobayashi

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Steiger, K., Nishimura, S., Li, Z. et al. Nuclear structure of 37, 38Si investigated by decay spectroscopy of 37, 38Al. Eur. Phys. J. A 51, 117 (2015). https://doi.org/10.1140/epja/i2015-15117-9

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  • DOI: https://doi.org/10.1140/epja/i2015-15117-9

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