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Title: Core excitations across the neutron shell gap in 207Tl

Abstract

The single closed-neutron-shell, one proton–hole nucleus 207Tl was populated in deep-inelastic collisions of a 208Pb beam with a 208Pb target. The yrast and near-yrast level scheme has been established up to high excitation energy, comprising an octupole phonon state and a large number of core excited states. Based on shell-model calculations, all observed single core excitations were established to arise from the breaking of the N=126 neutron core. While the shell-model calculations correctly predict the ordering of these states, their energies are compressed at high spins. It is concluded that this compression is an intrinsic feature of shell-model calculations using two-body matrix elements developed for the description of two-body states, and that multiple core excitations need to be considered in order to accurately calculate the energy spacings of the predominantly three-quasiparticle states.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1198546
Alternate Identifier(s):
OSTI ID: 1208910
Grant/Contract Number:  
AC02-06CH11357; FG02-94ER40834
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 747 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Wilson, E., Podolyák, Zs., Grawe, H., Brown, B. A., Chiara, C. J., Zhu, S., Fornal, B., Janssens, R. V. F., Shand, C. M., Bowry, M., Bunce, M., Carpenter, M. P., Cieplicka-Oryńczak, N., Deo, A. Y., Dracoulis, G. D., Hoffman, C. R., Kempley, R. S., Kondev, F. G., Lane, G. J., Lauritsen, T., Lotay, G., Reed, M. W., Regan, P. H., Rodríguez Triguero, C., Seweryniak, D., Szpak, B., and Walker, P. M. Core excitations across the neutron shell gap in 207Tl. Netherlands: N. p., 2015. Web. doi:10.1016/j.physletb.2015.04.055.
Wilson, E., Podolyák, Zs., Grawe, H., Brown, B. A., Chiara, C. J., Zhu, S., Fornal, B., Janssens, R. V. F., Shand, C. M., Bowry, M., Bunce, M., Carpenter, M. P., Cieplicka-Oryńczak, N., Deo, A. Y., Dracoulis, G. D., Hoffman, C. R., Kempley, R. S., Kondev, F. G., Lane, G. J., Lauritsen, T., Lotay, G., Reed, M. W., Regan, P. H., Rodríguez Triguero, C., Seweryniak, D., Szpak, B., & Walker, P. M. Core excitations across the neutron shell gap in 207Tl. Netherlands. https://doi.org/10.1016/j.physletb.2015.04.055
Wilson, E., Podolyák, Zs., Grawe, H., Brown, B. A., Chiara, C. J., Zhu, S., Fornal, B., Janssens, R. V. F., Shand, C. M., Bowry, M., Bunce, M., Carpenter, M. P., Cieplicka-Oryńczak, N., Deo, A. Y., Dracoulis, G. D., Hoffman, C. R., Kempley, R. S., Kondev, F. G., Lane, G. J., Lauritsen, T., Lotay, G., Reed, M. W., Regan, P. H., Rodríguez Triguero, C., Seweryniak, D., Szpak, B., and Walker, P. M. Wed . "Core excitations across the neutron shell gap in 207Tl". Netherlands. https://doi.org/10.1016/j.physletb.2015.04.055.
@article{osti_1198546,
title = {Core excitations across the neutron shell gap in 207Tl},
author = {Wilson, E. and Podolyák, Zs. and Grawe, H. and Brown, B. A. and Chiara, C. J. and Zhu, S. and Fornal, B. and Janssens, R. V. F. and Shand, C. M. and Bowry, M. and Bunce, M. and Carpenter, M. P. and Cieplicka-Oryńczak, N. and Deo, A. Y. and Dracoulis, G. D. and Hoffman, C. R. and Kempley, R. S. and Kondev, F. G. and Lane, G. J. and Lauritsen, T. and Lotay, G. and Reed, M. W. and Regan, P. H. and Rodríguez Triguero, C. and Seweryniak, D. and Szpak, B. and Walker, P. M.},
abstractNote = {The single closed-neutron-shell, one proton–hole nucleus 207Tl was populated in deep-inelastic collisions of a 208Pb beam with a 208Pb target. The yrast and near-yrast level scheme has been established up to high excitation energy, comprising an octupole phonon state and a large number of core excited states. Based on shell-model calculations, all observed single core excitations were established to arise from the breaking of the N=126 neutron core. While the shell-model calculations correctly predict the ordering of these states, their energies are compressed at high spins. It is concluded that this compression is an intrinsic feature of shell-model calculations using two-body matrix elements developed for the description of two-body states, and that multiple core excitations need to be considered in order to accurately calculate the energy spacings of the predominantly three-quasiparticle states.},
doi = {10.1016/j.physletb.2015.04.055},
journal = {Physics Letters B},
number = C,
volume = 747,
place = {Netherlands},
year = {Wed Jul 01 00:00:00 EDT 2015},
month = {Wed Jul 01 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2015.04.055

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Figures / Tables:

Figure 1 Figure 1: (a) γ -ray transitions in coincidence with the 1608.5-keV transition from 209Bi. Gamma lines from reaction partners 207Tl and 209Bi are visible. (b) Spectrum obtained by gating on the 2464.9-keV transition from 207Tl. The transitions labelled in red are assigned to 207Tl, while those labelled in blue andmore » italics are from 209Bi. The transitions labelled with bold are from 208Pb. The insets show the first and second core-breaking transitions in 207Tl.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.