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Title: How Robust is the N = 34 Subshell Closure? First Spectroscopy of Ar 52

Abstract

The first γ-ray spectroscopy of 52Ar, with the neutron number N = 34, was measured using the 53K(p, 2p) one-proton removal reaction at ~210 MeV/u at the RIBF facility. The 2 + 1 excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N > 20. This result is the first experimental signature of the persistence of the N = 34 subshell closure beyond 54Ca, i.e., below the magic proton number Z = 20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 2+1 systematics of neutron-rich Ar isotopes, and support a N = 34 subshell closure in 52Ar.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [5];  [8];  [6];  [9];  [3];  [3];  [10];  [10];  [11];  [3];  [10];  [3];  [10] more »;  [10];  [10];  [10];  [10];  [3];  [12];  [13];  [10];  [3];  [14];  [3];  [3];  [10];  [15];  [16];  [3];  [3];  [17];  [18];  [19];  [3];  [20];  [3];  [21];  [22];  [23];  [9];  [9];  [24];  [25];  [26];  [27];  [28];  [20];  [29];  [30];  [31];  [22];  [23];  [31];  [9];  [25];  [29];  [27];  [22];  [32];  [33];  [22];  [29];  [34];  [35];  [22];  [36];  [22];  [31];  [29];  [36];  [3];  [29];  [22] « less
  1. Univ. Paris-Saclay, Gif-sur-Yvette (France); Technische Univ. Darmstadt, Darmstadt (Germany); Royal Inst. of Technology, Stockholm (Sweden)
  2. Technische Univ. Darmstadt, Darmstadt (Germany); Univ. Paris-Saclay, Gif-sur-Yvette (Germany); RIKEN Nishina Center, Saitama (Japan)
  3. RIKEN Nishina Center, Saitama (Japan)
  4. Texas A&M Univ.-Commerce, Commerce, TX (United States); Technische Univ. Darmstadt, Darmstadt (Germany)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. TRIUMF, Vancouver, BC (Canada)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Technische Univ. Darmstadt, Darmstadt (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Max-Planck-Institut für Kernphysik, Heidelberg (Germany)
  9. Univ. Paris-Saclay, Orsay Cedex (France)
  10. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  11. Peking Univ., Beijing (People's Republic of China); RIKEN Nishina Center, Saitama (Japan); The Univ. of Hong Kong (Hong Kong)
  12. Tohoku Univ., Sendai (Japan)
  13. RIKEN Nishina Center, Saitama (Japan); Univ. of Tokyo, Saitama (Japan)
  14. Univ. Paris-Saclay, Orsay Cedex (France); RIKEN Nishina Center, Saitama (Japan)
  15. Univ. Nacional de Colombia, Bogota (Colombia); RIKEN Nishina Center, Saitama (Japan)
  16. RIKEN Nishina Center, Saitama (Japan); Univ. of Tokyo, Tokyo (Japan)
  17. Univ. of Tokyo, Saitama (Japan)
  18. Univ. Paris-Saclay, Gif-sur-Yvette (France); Technische Univ. Darmstadt, Darmstadt (Germany)
  19. Rikkyo Univ., Tokyo (Japan)
  20. Univ. of Tokyo, Tokyo (Japan)
  21. Royal Inst. of Technology, Stockholm (Sweden)
  22. Technische Univ. Darmstadt, Darmstadt (Germany)
  23. Institute for Nuclear Science & Technology, Hanoi (Vietnam)
  24. Ruder Boskovic Inst., Zagreb (Croatia); RIKEN Nishina Center, Saitama (Japan)
  25. Univ. zu Koln, Cologne (Germany)
  26. Univ. de Caen, Caen (France)
  27. Ewha Womans Univ., Seoul (Korea)
  28. Ewha Womans Univ., Seoul (Korea); RIKEN Nishina Center, Saitama (Japan)
  29. Tokyo Inst. of Technology, Tokyo (Japan)
  30. Technische Univ. Darmstadt, Darmstadt (Germany); GSI Helmoltzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  31. The Univ. of Hong Kong (Hong Kong)
  32. Univ. of Oslo, Oslo (Norway)
  33. MTA Atomki, Debrecen (Hungary)
  34. GSI Helmoltzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  35. Instituto de Estructura de la Materia, Madrid (Spain)
  36. Chinese Academy of Sciences, Lanzhou (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1495555
Alternate Identifier(s):
OSTI ID: 1545567
Grant/Contract Number:  
AC05-00OR22725; FG02-08ER41533; SC0018223
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 7; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Liu, H. N., Obertelli, A., Doornenbal, P., Bertulani, C. A., Hagen, G., Holt, J. D., Jansen, G. R., Morris, T. D., Schwenk, A., Stroberg, R., Achouri, N., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Sohler, D., Söderström, P. -A., Takeuchi, S., Törnqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L. How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar52. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.072502.
Liu, H. N., Obertelli, A., Doornenbal, P., Bertulani, C. A., Hagen, G., Holt, J. D., Jansen, G. R., Morris, T. D., Schwenk, A., Stroberg, R., Achouri, N., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Sohler, D., Söderström, P. -A., Takeuchi, S., Törnqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., & Zanetti, L. How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar52. United States. doi:10.1103/PhysRevLett.122.072502.
Liu, H. N., Obertelli, A., Doornenbal, P., Bertulani, C. A., Hagen, G., Holt, J. D., Jansen, G. R., Morris, T. D., Schwenk, A., Stroberg, R., Achouri, N., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J. -M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Sohler, D., Söderström, P. -A., Takeuchi, S., Törnqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., and Zanetti, L. Thu . "How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar52". United States. doi:10.1103/PhysRevLett.122.072502.
@article{osti_1495555,
title = {How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar52},
author = {Liu, H. N. and Obertelli, A. and Doornenbal, P. and Bertulani, C. A. and Hagen, G. and Holt, J. D. and Jansen, G. R. and Morris, T. D. and Schwenk, A. and Stroberg, R. and Achouri, N. and Baba, H. and Browne, F. and Calvet, D. and Château, F. and Chen, S. and Chiga, N. and Corsi, A. and Cortés, M. L. and Delbart, A. and Gheller, J. -M. and Giganon, A. and Gillibert, A. and Hilaire, C. and Isobe, T. and Kobayashi, T. and Kubota, Y. and Lapoux, V. and Motobayashi, T. and Murray, I. and Otsu, H. and Panin, V. and Paul, N. and Rodriguez, W. and Sakurai, H. and Sasano, M. and Steppenbeck, D. and Stuhl, L. and Sun, Y. L. and Togano, Y. and Uesaka, T. and Wimmer, K. and Yoneda, K. and Aktas, O. and Aumann, T. and Chung, L. X. and Flavigny, F. and Franchoo, S. and Gašparić, I. and Gerst, R. -B. and Gibelin, J. and Hahn, K. I. and Kim, D. and Koiwai, T. and Kondo, Y. and Koseoglou, P. and Lee, J. and Lehr, C. and Linh, B. D. and Lokotko, T. and MacCormick, M. and Moschner, K. and Nakamura, T. and Park, S. Y. and Rossi, D. and Sahin, E. and Sohler, D. and Söderström, P. -A. and Takeuchi, S. and Törnqvist, H. and Vaquero, V. and Wagner, V. and Wang, S. and Werner, V. and Xu, X. and Yamada, H. and Yan, D. and Yang, Z. and Yasuda, M. and Zanetti, L.},
abstractNote = {The first γ-ray spectroscopy of 52Ar, with the neutron number N = 34, was measured using the 53K(p, 2p) one-proton removal reaction at ~210 MeV/u at the RIBF facility. The 2+1 excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N > 20. This result is the first experimental signature of the persistence of the N = 34 subshell closure beyond 54Ca, i.e., below the magic proton number Z = 20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 2+1 systematics of neutron-rich Ar isotopes, and support a N = 34 subshell closure in 52Ar.},
doi = {10.1103/PhysRevLett.122.072502},
journal = {Physical Review Letters},
number = 7,
volume = 122,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevLett.122.072502

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