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Title: Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172 Dy: Collectivity beyond double midshell

Abstract

The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2 = 0.71(5) s and Kπ = 8- has been identified at 1278 keV, which decays to the ground-state and γ -vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ = 8- isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ -vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics; Japan Society for the Promotion of Science (JSPS); National Research Foundation of Korea (NRF); National University of Ireland - Galway
OSTI Identifier:
1392363
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 760; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
172Dy; Axial symmetry; Decay spectroscopy; K isomer; y vibration

Citation Formats

Watanabe, H., Zhang, G. X., Yoshida, K., Walker, P. M., Liu, J. J., Wu, J., Regan, P. H., Söderström, P. -A., Kanaoka, H., Korkulu, Z., Lee, P. S., Nishimura, S., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carroll, R. J., Chae, K. Y., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kondev, F. G., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lane, G. J., Lee, C. S., Lee, E. J., Lorusso, G., Lotay, G., Moon, C. -B., Nishizuka, I., Nita, C. R., Odahara, A., Patel, Z., Phong, V. H., Podolyák, Zs., Roberts, O. J., Sakurai, H., Schaffner, H., Shand, C. M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J. J., and Xu, Z. Y. Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172 Dy: Collectivity beyond double midshell. United States: N. p., 2016. Web. doi:10.1016/j.physletb.2016.07.057.
Watanabe, H., Zhang, G. X., Yoshida, K., Walker, P. M., Liu, J. J., Wu, J., Regan, P. H., Söderström, P. -A., Kanaoka, H., Korkulu, Z., Lee, P. S., Nishimura, S., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carroll, R. J., Chae, K. Y., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kondev, F. G., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lane, G. J., Lee, C. S., Lee, E. J., Lorusso, G., Lotay, G., Moon, C. -B., Nishizuka, I., Nita, C. R., Odahara, A., Patel, Z., Phong, V. H., Podolyák, Zs., Roberts, O. J., Sakurai, H., Schaffner, H., Shand, C. M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J. J., & Xu, Z. Y. Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172 Dy: Collectivity beyond double midshell. United States. https://doi.org/10.1016/j.physletb.2016.07.057
Watanabe, H., Zhang, G. X., Yoshida, K., Walker, P. M., Liu, J. J., Wu, J., Regan, P. H., Söderström, P. -A., Kanaoka, H., Korkulu, Z., Lee, P. S., Nishimura, S., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carroll, R. J., Chae, K. Y., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kondev, F. G., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lane, G. J., Lee, C. S., Lee, E. J., Lorusso, G., Lotay, G., Moon, C. -B., Nishizuka, I., Nita, C. R., Odahara, A., Patel, Z., Phong, V. H., Podolyák, Zs., Roberts, O. J., Sakurai, H., Schaffner, H., Shand, C. M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J. J., and Xu, Z. Y. 2016. "Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172 Dy: Collectivity beyond double midshell". United States. https://doi.org/10.1016/j.physletb.2016.07.057.
@article{osti_1392363,
title = {Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172 Dy: Collectivity beyond double midshell},
author = {Watanabe, H. and Zhang, G. X. and Yoshida, K. and Walker, P. M. and Liu, J. J. and Wu, J. and Regan, P. H. and Söderström, P. -A. and Kanaoka, H. and Korkulu, Z. and Lee, P. S. and Nishimura, S. and Yagi, A. and Ahn, D. S. and Alharbi, T. and Baba, H. and Browne, F. and Bruce, A. M. and Carroll, R. J. and Chae, K. Y. and Dombradi, Zs. and Doornenbal, P. and Estrade, A. and Fukuda, N. and Griffin, C. and Ideguchi, E. and Inabe, N. and Isobe, T. and Kanaya, S. and Kojouharov, I. and Kondev, F. G. and Kubo, T. and Kubono, S. and Kurz, N. and Kuti, I. and Lalkovski, S. and Lane, G. J. and Lee, C. S. and Lee, E. J. and Lorusso, G. and Lotay, G. and Moon, C. -B. and Nishizuka, I. and Nita, C. R. and Odahara, A. and Patel, Z. and Phong, V. H. and Podolyák, Zs. and Roberts, O. J. and Sakurai, H. and Schaffner, H. and Shand, C. M. and Shimizu, Y. and Sumikama, T. and Suzuki, H. and Takeda, H. and Terashima, S. and Vajta, Zs. and Valiente-Dóbon, J. J. and Xu, Z. Y.},
abstractNote = {The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2 = 0.71(5) s and Kπ = 8- has been identified at 1278 keV, which decays to the ground-state and γ -vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ = 8- isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ -vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.},
doi = {10.1016/j.physletb.2016.07.057},
url = {https://www.osti.gov/biblio/1392363}, journal = {Physics Letters. Section B},
issn = {0370-2693},
number = C,
volume = 760,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}