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Title: Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Abstract

The neutron-rich dysprosium isotopes 168Dy 102 and 169Dy 103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned J π = K π = (4¯) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B( E2) value for the transition de-exciting the previously unreported K π = (1/2¯) isomeric state at 166 keV to the K π = (1/2¯) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone 173Yb, suggesting the presence of amore » significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.« less

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Saha Institute of Nuclear Physics; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1571356
Alternate Identifier(s):
OSTI ID: 1581003
Grant/Contract Number:  
AC02-06CH11357; 2017M2A2A6A02071071; 2016R1D1A1A09917463; 2014S1A2A2028636; 2016K1A3A7A09005579; FT100100991
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 799 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Zhang, G. X., Watanabe, H., Dracoulis, G. D., Kondev, F. G., Lane, G. J., Regan, P. H., Söderström, P. -A., Walker, P. M., Yoshida, K., Kanaoka, H., Korkulu, Z., Lee, P. S., Liu, J. J., Nishimura, S., Wu, J., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carpenter, M. P., Carroll, R. J., Chae, K. Y., Chiara, C. J., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lauritsen, T., Lee, C. S., Lee, E. J., Lister, C. J., Lorusso, G., Lotay, G., McCutchan, E. A., Moon, C. -B., Nishizuka, I., Nita, C. R., Odahara, A., Patel, Z., Phong, V. H., Podolyák, Zs., Roberts, O. J., Sakurai, H., Schaffner, H., Seweryniak, D., Shand, C. M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J. J., Xu, Z. Y., and Zhu, S. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy. Netherlands: N. p., 2019. Web. doi:10.1016/j.physletb.2019.135036.
Zhang, G. X., Watanabe, H., Dracoulis, G. D., Kondev, F. G., Lane, G. J., Regan, P. H., Söderström, P. -A., Walker, P. M., Yoshida, K., Kanaoka, H., Korkulu, Z., Lee, P. S., Liu, J. J., Nishimura, S., Wu, J., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carpenter, M. P., Carroll, R. J., Chae, K. Y., Chiara, C. J., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lauritsen, T., Lee, C. S., Lee, E. J., Lister, C. J., Lorusso, G., Lotay, G., McCutchan, E. A., Moon, C. -B., Nishizuka, I., Nita, C. R., Odahara, A., Patel, Z., Phong, V. H., Podolyák, Zs., Roberts, O. J., Sakurai, H., Schaffner, H., Seweryniak, D., Shand, C. M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J. J., Xu, Z. Y., & Zhu, S. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy. Netherlands. doi:10.1016/j.physletb.2019.135036.
Zhang, G. X., Watanabe, H., Dracoulis, G. D., Kondev, F. G., Lane, G. J., Regan, P. H., Söderström, P. -A., Walker, P. M., Yoshida, K., Kanaoka, H., Korkulu, Z., Lee, P. S., Liu, J. J., Nishimura, S., Wu, J., Yagi, A., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carpenter, M. P., Carroll, R. J., Chae, K. Y., Chiara, C. J., Dombradi, Zs., Doornenbal, P., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Isobe, T., Kanaya, S., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lauritsen, T., Lee, C. S., Lee, E. J., Lister, C. J., Lorusso, G., Lotay, G., McCutchan, E. A., Moon, C. -B., Nishizuka, I., Nita, C. R., Odahara, A., Patel, Z., Phong, V. H., Podolyák, Zs., Roberts, O. J., Sakurai, H., Schaffner, H., Seweryniak, D., Shand, C. M., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Valiente-Dóbon, J. J., Xu, Z. Y., and Zhu, S. Sun . "Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy". Netherlands. doi:10.1016/j.physletb.2019.135036.
@article{osti_1571356,
title = {Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy},
author = {Zhang, G. X. and Watanabe, H. and Dracoulis, G. D. and Kondev, F. G. and Lane, G. J. and Regan, P. H. and Söderström, P. -A. and Walker, P. M. and Yoshida, K. and Kanaoka, H. and Korkulu, Z. and Lee, P. S. and Liu, J. J. and Nishimura, S. and Wu, J. and Yagi, A. and Ahn, D. S. and Alharbi, T. and Baba, H. and Browne, F. and Bruce, A. M. and Carpenter, M. P. and Carroll, R. J. and Chae, K. Y. and Chiara, C. J. 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 Kubo, T. and Kubono, S. and Kurz, N. and Kuti, I. and Lalkovski, S. and Lauritsen, T. and Lee, C. S. and Lee, E. J. and Lister, C. J. and Lorusso, G. and Lotay, G. and McCutchan, E. A. 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 Seweryniak, D. 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. and Zhu, S.},
abstractNote = {The neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ = Kπ = (4¯) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ = (1/2¯) isomeric state at 166 keV to the Kπ = (1/2¯) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.},
doi = {10.1016/j.physletb.2019.135036},
journal = {Physics Letters B},
number = C,
volume = 799,
place = {Netherlands},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2019.135036

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