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Title: New isomers in 125Pd 79 and 127Pd 81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure

Abstract

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in 125Pd 79 and 127Pd 81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2 +) and (19/2 +) in 125Pd and 127Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus 132Sn.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [4];  [5]; ORCiD logo [3];  [3];  [6];  [3];  [7];  [8];  [9];  [10];  [11];  [3]; ORCiD logo [12];  [13];  [14];  [3] more »;  [15];  [3];  [3];  [16];  [3];  [17];  [18];  [19]; ORCiD logo [20];  [3];  [19];  [17];  [21];  [22];  [23];  [24];  [25];  [26];  [4];  [11];  [27];  [11];  [28];  [29];  [29];  [3];  [19];  [30];  [31];  [32];  [3];  [3];  [33];  [34] « less
  1. Beihang Univ., Beijing (China); RIKEN Nishina Center, Saitama (Japan)
  2. Zhoukou Normal Univ., Henan (China)
  3. RIKEN Nishina Center, Saitama (Japan)
  4. Univ. of Tokyo, Tokyo (Japan)
  5. Tohoku Univ., Miyagi (Japan)
  6. RIKEN Nishina Center, Saitama (Japan); Univ. of Brighton, Brighton (United Kingdom)
  7. Chung-Ang Univ., Seoul (Republic of Korea)
  8. RIKEN Nishina Center, Saitama (Japan); Univ. Autonoma de Madrid, Madrid (Spain); Instituto de Estructura de la Materia, Madrid (Spain)
  9. RIKEN Nishina Center, Saitama (Japan); MTA Atomki, Debrecen (Hungary)
  10. RIKEN Nishina Center, Saitama (Japan); Peking Univ., Beijing (China)
  11. Osaka Univ., Toyonaka (Japan)
  12. INFN, Milano (Italy)
  13. Sungkyunkwan Univ., Suwon (Republic of Korea)
  14. INFN, Milano (Italy); Univ. di Milano, Milano (Italy)
  15. Technische Univ. München, Garching (Germany)
  16. Inst. de Estructura de la Materia, Madrid (Spain)
  17. Inst. for Basic Science, Daejeon (Republic of Korea)
  18. Inst. for Basic Science, Daejeon (Republic of Korea); Hanyang Univ., Seoul (Republic of Korea)
  19. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  20. Argonne National Lab. (ANL), Argonne, IL (United States)
  21. Australian National Univ., Canberra, A.C.T. (Australia)
  22. Peking Univ., Beijing (China)
  23. Hoseo Univ., Chung-Nam (Republic of Korea)
  24. CSIC-Univ. de Valencia, Valencia (Spain)
  25. Univ. zu Koln, Koln (Germany)
  26. Yale Univ., New Haven, CT (United States)
  27. Tokyo City Univ., Tokyo (Japan)
  28. Univ. of Leuven, Leuven (Belgium)
  29. Univ. of Surrey, Guildford (United Kingdom)
  30. Univ. Joseph Fourier Grenoble, Grenoble Cedex (France)
  31. Technische Univ. Munchen, Garching (Germany)
  32. Shanghai Jiao Tong Univ., Shanghai (China)
  33. Univ. zu Köln, Koln (Germany)
  34. Tokyo Univ. of Science, Chiba (Japan)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Research Foundation of Korea (NRF)
OSTI Identifier:
1547556
Alternate Identifier(s):
OSTI ID: 1545596
Grant/Contract Number:  
AC02-06CH11357; NRF-2016R1A5A1013277; NRF-2013M7A1A1075764
Resource Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 792; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Watanabe, H., Wang, H. K., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Söderström, P. -A., Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C. -B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K. New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure. United States: N. p., 2019. Web. doi:10.1016/j.physletb.2019.03.053.
Watanabe, H., Wang, H. K., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Söderström, P. -A., Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C. -B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A., & Yoshinaga, K. New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure. United States. doi:10.1016/j.physletb.2019.03.053.
Watanabe, H., Wang, H. K., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Söderström, P. -A., Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C. -B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K. Mon . "New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure". United States. doi:10.1016/j.physletb.2019.03.053.
@article{osti_1547556,
title = {New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure},
author = {Watanabe, H. and Wang, H. K. and Lorusso, G. and Nishimura, S. and Xu, Z. Y. and Sumikama, T. and Söderström, P. -A. and Doornenbal, P. and Browne, F. and Gey, G. and Jung, H. S. and Taprogge, J. and Vajta, Zs. and Wu, J. and Yagi, A. and Baba, H. and Benzoni, G. and Chae, K. Y. and Crespi, F. C. L. and Fukuda, N. and Gernhäuser, R. and Inabe, N. and Isobe, T. and Jungclaus, A. and Kameda, D. and Kim, G. D. and Kim, Y. K. and Kojouharov, I. and Kondev, F. G. and Kubo, T. and Kurz, N. and Kwon, Y. K. and Lane, G. J. and Li, Z. and Moon, C. -B. and Montaner-Pizá, A. and Moschner, K. and Naqvi, F. and Niikura, M. and Nishibata, H. and Nishimura, D. and Odahara, A. and Orlandi, R. and Patel, Z. and Podolyák, Zs. and Sakurai, H. and Schaffner, H. and Simpson, G. S. and Steiger, K. and Sun, Y. and Suzuki, H. and Takeda, H. and Wendt, A. and Yoshinaga, K.},
abstractNote = {The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in 125Pd79 and 127Pd81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2+) and (19/2+) in 125Pd and 127Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus 132Sn.},
doi = {10.1016/j.physletb.2019.03.053},
journal = {Physics Letters. Section B},
number = C,
volume = 792,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2019.03.053

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