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Title: The role of core excitations in the structure and decay of the 16 + spin-gap isomer in 96Cd

Abstract

The first evidence for β -delayed proton emission from the 16 + spin gap isomer in 96Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16 + isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of 95Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in 96Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ~5 MeV above the proton separation energy, dominates the proton decay. Finally, the results highlight the importance of core-excited wavefunction components for the 16 + state.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [1];  [5];  [2];  [6];  [7];  [8];  [4];  [7];  [9];  [10];  [2];  [9];  [11];  [2];  [5];  [7] more »;  [1];  [11];  [4];  [2];  [2];  [12];  [7];  [9];  [5];  [13];  [6];  [11];  [7];  [14];  [5];  [2];  [7];  [11];  [9];  [15];  [16];  [4];  [4];  [7];  [17];  [7];  [7];  [11] « less
  1. Univ. of York, York (United Kingdom)
  2. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  3. Univ. zu Koln, Koln (Germany); RIKEN Nishina Center, Saitama (Japan)
  4. Univ. zu Koln, Koln (Germany)
  5. Technische Univ. Darmstadt, Darmstadt (Germany)
  6. Osaka Univ., Osaka (Japan)
  7. RIKEN Nishina Center, Saitama (Japan)
  8. Royal Inst. of Technology, Stockholm (Sweden)
  9. Technische Univ. Munchen, Garching (Germany)
  10. Uppsala Univ., Uppsala (Sweden)
  11. Univ. of Tokyo, Tokyo (Japan)
  12. Grand Accelerateur National d'Ions Lourds (GANIL), Carn Cedex (France)
  13. Yale Univ., New Haven, CT (United States)
  14. IN2p3-CNRS et Univ. Strasbourg, Strasbourg (France)
  15. Tohoku Univ., Miyagi (Japan)
  16. Instituto de Estructura de la Materia, Madrid (Spain)
  17. Technische Univ. Darmstadt, Darmstadt (Germany); Yale Univ., New Haven, CT (United States)
Publication Date:
Research Org.:
Univ. of York, York (United Kingdom)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1345842
Alternate Identifier(s):
OSTI ID: 1358380
Grant/Contract Number:
FG02-91ER40609
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 767; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; β-decay; βp-decay; γ-ray spectroscopy; half-life; shell-model; WKB

Citation Formats

Davies, Paul John, Grawe, H., Moschner, K., Blazhev, A., Wadsworth, R., Boutachkov, P., Ameil, F., Yagi, A., Baba, H., Bäck, T., Dewald, M., Doornenbal, P., Faestermann, T., Gengelbach, A., Gerl, J., Gernhäeuser, R., Go, S., Górska, M., Gregor, E., Isobe, T., Jenkins, D. G., Hotaka, H., Jolie, J., Kojouharov, I., Kurz, N., Lewitowicz, M., Lorusso, G., Maier, L., Merchan, E., Naqvi, F., Nishibata, H., Nishimura, D., Nishimura, S., Nowacki, F., Pietralla, N., Schaffner, H., Söderström, P. -A., Jung, H. S., Steiger, K., Sumikama, T., Taprogge, J., Thöle, P., Warr, N., Watanabe, H., Werner, V., Xu, Z. Y., Yoshinaga, K., and Zhu, Y.. The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd. United States: N. p., 2017. Web. doi:10.1016/j.physletb.2017.02.013.
Davies, Paul John, Grawe, H., Moschner, K., Blazhev, A., Wadsworth, R., Boutachkov, P., Ameil, F., Yagi, A., Baba, H., Bäck, T., Dewald, M., Doornenbal, P., Faestermann, T., Gengelbach, A., Gerl, J., Gernhäeuser, R., Go, S., Górska, M., Gregor, E., Isobe, T., Jenkins, D. G., Hotaka, H., Jolie, J., Kojouharov, I., Kurz, N., Lewitowicz, M., Lorusso, G., Maier, L., Merchan, E., Naqvi, F., Nishibata, H., Nishimura, D., Nishimura, S., Nowacki, F., Pietralla, N., Schaffner, H., Söderström, P. -A., Jung, H. S., Steiger, K., Sumikama, T., Taprogge, J., Thöle, P., Warr, N., Watanabe, H., Werner, V., Xu, Z. Y., Yoshinaga, K., & Zhu, Y.. The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd. United States. doi:10.1016/j.physletb.2017.02.013.
Davies, Paul John, Grawe, H., Moschner, K., Blazhev, A., Wadsworth, R., Boutachkov, P., Ameil, F., Yagi, A., Baba, H., Bäck, T., Dewald, M., Doornenbal, P., Faestermann, T., Gengelbach, A., Gerl, J., Gernhäeuser, R., Go, S., Górska, M., Gregor, E., Isobe, T., Jenkins, D. G., Hotaka, H., Jolie, J., Kojouharov, I., Kurz, N., Lewitowicz, M., Lorusso, G., Maier, L., Merchan, E., Naqvi, F., Nishibata, H., Nishimura, D., Nishimura, S., Nowacki, F., Pietralla, N., Schaffner, H., Söderström, P. -A., Jung, H. S., Steiger, K., Sumikama, T., Taprogge, J., Thöle, P., Warr, N., Watanabe, H., Werner, V., Xu, Z. Y., Yoshinaga, K., and Zhu, Y.. Tue . "The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd". United States. doi:10.1016/j.physletb.2017.02.013.
@article{osti_1345842,
title = {The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd},
author = {Davies, Paul John and Grawe, H. and Moschner, K. and Blazhev, A. and Wadsworth, R. and Boutachkov, P. and Ameil, F. and Yagi, A. and Baba, H. and Bäck, T. and Dewald, M. and Doornenbal, P. and Faestermann, T. and Gengelbach, A. and Gerl, J. and Gernhäeuser, R. and Go, S. and Górska, M. and Gregor, E. and Isobe, T. and Jenkins, D. G. and Hotaka, H. and Jolie, J. and Kojouharov, I. and Kurz, N. and Lewitowicz, M. and Lorusso, G. and Maier, L. and Merchan, E. and Naqvi, F. and Nishibata, H. and Nishimura, D. and Nishimura, S. and Nowacki, F. and Pietralla, N. and Schaffner, H. and Söderström, P. -A. and Jung, H. S. and Steiger, K. and Sumikama, T. and Taprogge, J. and Thöle, P. and Warr, N. and Watanabe, H. and Werner, V. and Xu, Z. Y. and Yoshinaga, K. and Zhu, Y.},
abstractNote = {The first evidence for β -delayed proton emission from the 16+ spin gap isomer in 96Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16+ isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of 95Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in 96Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ~5 MeV above the proton separation energy, dominates the proton decay. Finally, the results highlight the importance of core-excited wavefunction components for the 16+ state.},
doi = {10.1016/j.physletb.2017.02.013},
journal = {Physics Letters. Section B},
number = C,
volume = 767,
place = {United States},
year = {Tue Feb 14 00:00:00 EST 2017},
month = {Tue Feb 14 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2017.02.013

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  • The first evidence for β -delayed proton emission from the 16 + spin gap isomer in 96Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16 + isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of 95Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in 96Ag, that aremore » populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ~5 MeV above the proton separation energy, dominates the proton decay. Finally, the results highlight the importance of core-excited wavefunction components for the 16 + state.« less
  • We have investigated the 0{sup {minus}} {sup 96}Y{sup {ital g}} {beta} decay to the levels of {sup 96}Zr. A detailed decay scheme comprised of 63 {gamma} rays and 44 energy levels has been obtained from {gamma} singles, {gamma} multispectral scaling, and {gamma}-{gamma} and {ital E}0-{gamma} coincidences. {ital Q}{sub {beta}} was measured using the {beta}-{gamma} coincidence technique, while absolute {ital E}0 and {gamma}-ray intensities were obtained from singles conversion electron and {gamma}-ray spectra measured at beam saturation. The high sensitivity of the study was aimed at investigating the {beta} feeding of levels with excitation enegy above 4 MeV. Although most ofmore » the new levels were found in this region, their total {beta} feeding was found to be below 0.6%. The first-forbidden {beta}-decay rate for 0{sup {minus}} {sup 96}Y{sup {ital g}}{r arrow}0{sup +} {sup 96}Zr{sup {ital g}} has been calculated within the framework of the spherical shell model using a model space of {pi}(0{ital f}{sub 7/2},0{ital f}{sub 5/2},1{ital p}{sub 3/2},1{ital p}{sub 1/2},0{ital g}{sub 9/2},1{ital p}{sub 1/2},0{ital g}{sub 9/2}){nu} (0g{sub 7/2},1{ital d}{sub 5/2},1{ital d}{sub 3/2},2{ital s}{sub 1/2}) with limitations on the orbit occupancies. Additional evidence for meson enhancement of the timelike component of the axial current is obtained; the meson-exchange enhancement factor was found to be 1.75{plus minus}0.30, where the uncertainty arises from the calculation.« less
  • The yrast structure of the neutron-rich nucleus {sup 97}Zr has been studied using fission of targetlike products in the reaction of a {sup 48}Ca beam on a thick {sup 238}U target. The level scheme, known from previous studies up to an excitation energy and spin-parity of approximately 4619 keV and 23/2{sup -}, has been extended by about 3 MeV and a few units of angular momentum. Two states fed in the {beta} decay of the 27/2{sup -} high-spin isomer in {sup 97}Y were identified at 5570 and 5606 keV. The located level structure can be discussed in terms of shell-modelmore » configurations.« less
  • The yrast structure of the neutron-rich nucleus {sup 97}Zr has been studied using fission of targetlike products in the reaction of a {sup 48}Ca beam on a thick {sup 238}U target. The level scheme, known from previous studies up to an excitation energy and spin-parity of approximately 4619 keV and 23/2{sup -}, has been extended by about 3 MeV and a few units of angular momentum. Two states fed in the {beta} decay of the 27/2{sup -} high-spin isomer in {sup 97}Y were identified at 5570 and 5606 keV. The located level structure can be discussed in terms of shell-modelmore » configurations.« less