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Title: Isomer spectroscopy of neutron-rich 168 Tb 103

Abstract

In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus 168Tb, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus 170Dy. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the 168Tb groundmore » state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.« less

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Research Foundation of Korea (NRF); USDOE Office of Science - Office of Nuclear Physics; United Kingdom Science and Technology Facilities Council; Japan Society for the Promotion of Science (JSPS) - KAKENHI
OSTI Identifier:
1394820
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Radiation Physics and Chemistry (1993); Journal Volume: 140
Country of Publication:
United States
Language:
English
Subject:
Gamma-ray spectroscopy and nuclear isomerism; Nuclear energy-level schemes; Possible two-quasiparticle configurations; Structure of neutron-rich Terbium; radioisotopes

Citation Formats

Gurgi, L. A., Regan, P. H., Söderström, P. -A., Watanabe, H., Walker, P. M., Podolyák, Zs., Nishimura, S., Berry, T. A., Doornenbal, P., Lorusso, G., Isobe, T., Baba, H., Xu, Z. Y., Sakurai, H., Sumikama, T., Catford, W. N., Bruce, A. M., Browne, F., Lane, G. J., Kondev, F. G., Odahara, A., Wu, J., Liu, H. L., Xu, F. R., Korkulu, Z., Lee, P., Liu, J. J., Phong, V. H., Yag, A., Zhang, G. X., Alharbi, T., Carroll, R. J., Chae, K. Y., Dombradi, Zs., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Kanaoka, H., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lee, E. J., Lee, C. S., Lotay, G., Moon, C. -B., Nishizuka, I., Nita, C. R., Patel, Z., Roberts, O. J., Schaffner, H., Shand, C. M., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Yoshida, S., and Valiente-Dòbon, J. J.. Isomer spectroscopy of neutron-rich 168 Tb 103. United States: N. p., 2017. Web. doi:10.1016/j.radphyschem.2016.12.011.
Gurgi, L. A., Regan, P. H., Söderström, P. -A., Watanabe, H., Walker, P. M., Podolyák, Zs., Nishimura, S., Berry, T. A., Doornenbal, P., Lorusso, G., Isobe, T., Baba, H., Xu, Z. Y., Sakurai, H., Sumikama, T., Catford, W. N., Bruce, A. M., Browne, F., Lane, G. J., Kondev, F. G., Odahara, A., Wu, J., Liu, H. L., Xu, F. R., Korkulu, Z., Lee, P., Liu, J. J., Phong, V. H., Yag, A., Zhang, G. X., Alharbi, T., Carroll, R. J., Chae, K. Y., Dombradi, Zs., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Kanaoka, H., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lee, E. J., Lee, C. S., Lotay, G., Moon, C. -B., Nishizuka, I., Nita, C. R., Patel, Z., Roberts, O. J., Schaffner, H., Shand, C. M., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Yoshida, S., & Valiente-Dòbon, J. J.. Isomer spectroscopy of neutron-rich 168 Tb 103. United States. doi:10.1016/j.radphyschem.2016.12.011.
Gurgi, L. A., Regan, P. H., Söderström, P. -A., Watanabe, H., Walker, P. M., Podolyák, Zs., Nishimura, S., Berry, T. A., Doornenbal, P., Lorusso, G., Isobe, T., Baba, H., Xu, Z. Y., Sakurai, H., Sumikama, T., Catford, W. N., Bruce, A. M., Browne, F., Lane, G. J., Kondev, F. G., Odahara, A., Wu, J., Liu, H. L., Xu, F. R., Korkulu, Z., Lee, P., Liu, J. J., Phong, V. H., Yag, A., Zhang, G. X., Alharbi, T., Carroll, R. J., Chae, K. Y., Dombradi, Zs., Estrade, A., Fukuda, N., Griffin, C., Ideguchi, E., Inabe, N., Kanaoka, H., Kojouharov, I., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lee, E. J., Lee, C. S., Lotay, G., Moon, C. -B., Nishizuka, I., Nita, C. R., Patel, Z., Roberts, O. J., Schaffner, H., Shand, C. M., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs., Yoshida, S., and Valiente-Dòbon, J. J.. Wed . "Isomer spectroscopy of neutron-rich 168 Tb 103". United States. doi:10.1016/j.radphyschem.2016.12.011.
@article{osti_1394820,
title = {Isomer spectroscopy of neutron-rich 168 Tb 103},
author = {Gurgi, L. A. and Regan, P. H. and Söderström, P. -A. and Watanabe, H. and Walker, P. M. and Podolyák, Zs. and Nishimura, S. and Berry, T. A. and Doornenbal, P. and Lorusso, G. and Isobe, T. and Baba, H. and Xu, Z. Y. and Sakurai, H. and Sumikama, T. and Catford, W. N. and Bruce, A. M. and Browne, F. and Lane, G. J. and Kondev, F. G. and Odahara, A. and Wu, J. and Liu, H. L. and Xu, F. R. and Korkulu, Z. and Lee, P. and Liu, J. J. and Phong, V. H. and Yag, A. and Zhang, G. X. and Alharbi, T. and Carroll, R. J. and Chae, K. Y. and Dombradi, Zs. and Estrade, A. and Fukuda, N. and Griffin, C. and Ideguchi, E. and Inabe, N. and Kanaoka, H. and Kojouharov, I. and Kubo, T. and Kubono, S. and Kurz, N. and Kuti, I. and Lalkovski, S. and Lee, E. J. and Lee, C. S. and Lotay, G. and Moon, C. -B. and Nishizuka, I. and Nita, C. R. and Patel, Z. and Roberts, O. J. and Schaffner, H. and Shand, C. M. and Suzuki, H. and Takeda, H. and Terashima, S. and Vajta, Zs. and Yoshida, S. and Valiente-Dòbon, J. J.},
abstractNote = {In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus 168Tb, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus 170Dy. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the 168Tb ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.},
doi = {10.1016/j.radphyschem.2016.12.011},
journal = {Radiation Physics and Chemistry (1993)},
number = ,
volume = 140,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}