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1. Single-particle structure in neutron-rich Sr isotopes approaching the N = 60 shape transition

Author

Cruz, S., Wimmer, K., Bhattacharjee, S. S., Bender, P. C., Hackman, G., Krücken, R., Ames, F., Andreoiu, C., Austin, R. A. E., Bancroft, C. S., Braid, R., Bruhn, T., Catford, W. N., Cheeseman, A., Chester, A., Cross, D. S., Diget, C. Aa., Drake, T., Garnsworthy, A. B., Kanungo, R., Knapton, A., Korten, W., Kuhn, K., Lassen, J., Laxdal, R., Marchetto, M., Matta, A., Miller, D., Moukaddam, M., Orr, N. A., Sachmpazidi, N., Sanetullaev, A., Svensson, C. E., Terpstra, N., Unsworth, C., and Voss, P. J.

Subjects
Nuclear Experiment
Abstract

Background: Neutron-rich nuclei around neutron number N = 60 show a dramatic shape transition from spherical ground states to prolate deformation in 98Sr and heavier nuclei. Purpose: The purpose of this study is to investigate the single-particle structure approaching the shape transitional region. Method: The level structures of neutron-rich 93,94,95Sr were studied via the d(94,95,96Sr,t) one-neutron stripping reactions at TRIUMF using a beam energy of 5.5 AMeV. {\gamma}-rays emitted from excited states and recoiling charged particles were detected by using the TIGRESS and SHARC arrays, respectively. States were identified by gating on the excitation energy and, if possible, the coincident {\gamma} radiation. Results: Triton angular distributions for the reactions populating states in ejectile nuclei 93,94,95Sr were compared with distorted wave Born approximation calculations to assign and revise spin and parity quantum numbers and extract spectroscopic factors. The results were compared with shell model calculations and the reverse (d,p) reactions and good agreement was obtained. Conclusions: The results for the d(94Sr,t)93Sr and d(95Sr,t)94Sr reactions are in good agreement with shell model calculations. A two level mixing analysis for the 0+ states in 94Sr suggest strong mixing of two shapes. For the d(96Sr,t)95Sr reaction the agreement with the shell model is less good. The configuration of the ground state of 96Sr is already more complex than predicted, and therefore indications for the shape transition can already be observed before N = 60., Comment: accepted for publication in PRC

Published
2020

2. Single-Particle Structure of Neutron-Rich Sr Isotopes Via d( 94,95,96 Sr, p) Reactions

Author

Cruz, S., Wimmer, K., Bender, P. C., Krücken, R., Hackman, G., Ames, F., Andreoiu, C., Austin, R. A. E., Bancroft, C. S., Braid, R., Bruhn, T., Catford, W. N., Cheeseman, A., Chester, A., Cross, D. S., Diget, C. Aa., Drake, T., Garnsworthy, A. B., Kanungo, R., Knapton, A., Korten, W., Kuhn, K., Lassen, J., Laxdal, R., Marchetto, M., Matta, A., Miller, D., Moukaddam, M., Orr, N. A., Sachmpazidi, N., Sanetullaev, A., Svensson, C. E., Terpstra, N., Unsworth, C., and Voss, P. J.

Subjects
Nuclear Experiment
Abstract

The region around neutron number N = 60 in the neutron-rich Sr and Zr nuclei is one of the most dramatic examples of a ground state shape transition from (near) spherical below N = 60 to strongly deformed shapes in the heavier isotopes. The single-particle structure of 95-97Sr approaching the ground state shape transition at 98 Sr has been investigated via single-neutron transfer reactions using the (d, p) reaction in inverse kinematics. These reactions selectively populate states with a large overlap of the projectile ground state coupled to a neutron in a single-particle orbital. Radioactive 94,95,96Sr nuclei with energies of 5.5 AMeV were used to bombard a CD 2 target. Recoiling light charged particles and {\gamma} rays were detected using a quasi-4{\pi} silicon strip detector array and a 12 element Ge array. The excitation energy of states populated was reconstructed employing the missing mass method combined with {\gamma}-ray tagging and differential cross sections for final states were extracted. A reaction model analysis of the angular distributions allowed for firm spin assignments to be made for the low-lying 352, 556 and 681 keV excited states in 95Sr and a constraint has been placed on the spin of the higher-lying 1666 keV state. Angular distributions have been extracted for 10 states populated in the d(95Sr,p)96Sr reaction, and constraints have been provided for the spins and parities of several final states. Results are compared to shell model calculations in several model spaces and the structure of low-lying states in 94Sr and 95Sr is well-described. The spectroscopic strength of the 0+ and 2 states in 96Sr is significantly more fragmented than predicted., Comment: PRC accepted

Published
2019

3. The GRIFFIN Facility for Decay-Spectroscopy Studies at TRIUMF-ISAC

Author

Garnsworthy, A. B., Svensson, C. E., Bowry, M., Dunlop, R., MacLean, A. D., Olaizola, B., Smith, J. K., Ali, F. A., Andreoiu, C., Ash, J. E., Ashfield, W. H., Ball, G. C., Ballast, T., Bartlett, C., Beadle, Z., Bender, P. C., Bernier, N., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Bishop, D., Boubel, P., Braid, R., Brennan, D., Bruhn, T., Burbadge, C., Cheeseman, A., Chester, A., Churchman, R., Ciccone, S., Caballero-Folch, R., Cross, D. S., Cruz, S., Davids, B., Varela, A. Diaz, Dillmann, I., Dunlop, M. R., Evitts, L. J., Garcia, F. H., Garrett, P. E., Georges, S., Gillespie, S., Gudapati, R., Hackman, G., Hadinia, B., Hallam, S., Henderson, J., Ilyushkin, S. V., Jigmeddorj, B., Kilic, A. I., Kisliuk, D., Kokke, R., Kuhn, K., Kruecken, R., Kuwabara, M., Laffoley, A. T., Lafleur, R., Leach, K. G., Leslie, J. R., Linn, Y., Lim, C., MacConnachie, E., Mathews, A. R., McGee, E., Measures, J., Miller, D., Mills, W. J., Moore, W., Morris, D., Morrison, L. N., Moukaddam, M., Natzke, C. R., Ortner, K., Padilla-Rodal, E., Paetkau, O., Park, J., Patel, H. P., Pearson, C. J., Peters, E., Peters, E. E., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Raymond, K., Rizwan, U., Ruotsalainen, P., Saito, Y., Sarazin, F., Shaw, B., Smallcombe, J., Southall, D., Starosta, K., Ticu, M., Timakova, E., Turko, J., Umashankar, R., Unsworth, C., Wang, Z. M., Whitmore, K., Wong, S., Yates, S. W., Zganjar, E. F., and Zidar, T.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei, GRIFFIN, is a new high-efficiency $\gamma$-ray spectrometer designed for use in decay spectroscopy experiments with low-energy radioactive ion beams provided by TRIUMF's Isotope Separator and Accelerator (ISAC-I) facility. GRIFFIN is composed of sixteen Compton-suppressed large-volume clover-type high-purity germanium (HPGe) $\gamma$-ray detectors combined with a suite of ancillary detection systems and coupled to a custom digital data acquisition system. The infrastructure and detectors of the spectrometer as well as the performance characteristics and the analysis techniques applied to the experimental data are described.

Published
2018
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4. Shape Coexistence and Mixing of Low-Lying $0^+$ States in $^{96}$Sr

Author

Cruz, S., Bender, P. C., Krücken, R., Wimmer, K., Ames, F., Andreoiu, C., Austin, R. A. E., Bancroft, C. S., Braid, R., Bruhn, T., Catford, W. N., Cheeseman, A., Chester, A., Cross, D. S., Diget, C. Aa., Drake, T., Garnsworthy, A. B., Hackman, G., Kanungo, R., Knapton, A., Korten, W., Kuhn, K., Lassen, J., Laxdal, R., Marchetto, M., Matta, A., Miller, D., Moukaddam, M., Orr, N. A., Sachmpazidi, N., Sanetullaev, A., Svensson, C. E., Terpstra, N., Unsworth, C., and Voss, P. J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The low energy excited $0_{2,3}^+$ states in $^{96}$Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron $[2s_{1/2}]^2$ content of the $0_{1,2,3}^+$ states in $^{96}$Sr was determined by means of the d($^{95}$Sr,p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the $^{96}$Sr ground and 1229~keV $0^+$ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the $\gamma$-decay of the isomeric $0_3^+$ state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited $0^+$ states in $^{96}$Sr. The strengths of the excited $0_{2,3}^+$ states were also analyzed within a two-level mixing model and are consistent with a mixing strength of $a^2$=0.40(14) and a difference in intrinsic deformations of $|\Delta \beta|=0.31(3)$. These results suggest coexistence of three different configurations in $^{96}$Sr and strong shape mixing of the two excited $0^+$ states., Comment: Phys Lett B accepted

Published
2018
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9. High-Statistics β+/EC-Decay Study of 122Xe

Author

Jigmeddorj, B., Garrett, P.E., Andreoiu, C.A., Ball, G.C., Bruhn, T., Cross, D.S., Garnsworthy, A.B., Hadinia, B., Moukaddam, M., Park, J., Pore, J.L., Radich, A.J., Rajabali, M.M., Rand, E.T., Rizwan, U., Svensson, C.E., Voss, P., Wang, Z., Wood, J.L., and Yates, S.W.

Published
2017
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10. Interactive network visualization on the integration of mindsets and sustainability – creating conditions for emergence through a relational narrative

Author

Bruhn, T., Meier, S., and Lawrence, M.

Subjects
Cultural Studies, Organizational Behavior and Human Resource Management, Sociology and Political Science, Management of Technology and Innovation, Strategy and Management, Geography, Planning and Development, Social Sciences (miscellaneous)
Abstract

Transdisciplinary research processes often involve the integration of knowledge and stakeholders from various backgrounds. Here, we introduce the story of the research project AMA (A Mindset for the Anthropocene) on the role of mindsets in the context of sustainability and present an interactive visualization tool that we developed for stakeholder mapping and research communication. Through this platform, we provide access and navigation to everyone interested in this field of research and we have simultaneously created a channel for all stakeholders to co-create content. Here, we describe the design and functionalities of the platform and the participatory way it was developed as part of our stakeholder engagement. We discuss upon how such a design allows for reflection of potential biases in transdisciplinary research processes and simultaneously catalyzing self-organization in stakeholder networks.

Published
2022
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11. New Opportunities in Decay Spectroscopy with the GRIFFIN and DESCANT Arrays

Author

Bildstein, V., Andreoiu, C., Ball, G.C., Ballast, T., Bartlett, C., Bender, P.C., Bernier, N., Bianco, L., Bishop, D., Brennan, D., Bruhn, T., Cheeseman, A., Churchman, R., Ciccone, S., Davids, B., Demand, G., Dillmann, I., Garnsworthy, A.B., Garrett, P.E., Georges, S., Hackman, G., Hadinia, B., Kokke, R., Krücken, R., Linn, Y., Lim, C., Martin, J.-P., Miller, D., Mills, W.J., Morrison, L.N., Ohlmann, C.A., Park, J., Pearson, C.J., Pore, J.L., Rajabali, M.M., Rand, E.T., Rizwan, U., Sarazin, F., Shaw, B., Starosta, K., Svensson, C.E., Sumithrarachchi, C., Unsworth, C., Voss, P., Wang, Z.M., Williams, J., Wong, J., and Wong, S.

Published
2015
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16. New low-spin states of 122Xe observed via high-statistics β-decay of 122Cs

Author

Jigmeddorj B., E. Garrett P., Andreoiu C., C. Ball G., Bruhn T., S. Cross D., B. Garnsworthy A., Hadinia B., Moukaddam M., Park J., L. Pore J., J. Radich A., M. Rajabali M., T. Rand E., Rizwan U., E. Svensson C., Voss P., M. Wang Z., L. Wood J., and W. Yates S.

Subjects
Physics, QC1-999
Abstract

Excited states of 122Xe were studied via the β+/EC decay of 122Cs with the 8π γ-ray spectrometer at the TRIUMF-ISAC facility. Compton-suppressed HPGe detectors were used for measurements of γ-ray intensities, γγ coincidences, and γ-γ angular correlations. Two sets of data were collected to optimize the decays of the ground (21.2 s) and isomeric (3.7 min) states of 122Cs. The data collected have enabled the observation of about 505 new transitions and about 250 new levels, including 51 new low-spin states. Spin assignments have been made for 58 low-spin states based on the deduced β-decay feeding and γ-γ angular correlation analyses.

Published
2018
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20. Nuclear structure of 122Xe studied via high-statistics β+/EC-decay

Author

Jigmeddorj B., Garrett P.E., Andreoiu C., Ball G.C., Bruhn T., Cross D.S., Garnsworthy A.B., Hackman G., Hadinia B., Moukaddam M., Park J., Pore J.L., Radich A.J., Rajabali M.M., Rand E.T., Rizman U., Svensson C.E., Voss P., Wang Z.M., Wood J.L., and Yates S.W.

Subjects
Physics, QC1-999
Abstract

The nuclear structure of 122Xe has been investigated with measurements of the β+/EC decay of 122Cs with the 8 π γ-ray spectrometer at the TRIUMF-ISAC facility. The data collected have enabled the determination of relative B(E2) values of some low-energy transitions, and the in-band transitions of the excited 0+ bands have been observed. As a result, the 2+ rotational band members for the 0+2 and 0+3 states have been firmly identified.

Published
2016
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21. Single-particle structure in neutron-rich Sr isotopes approaching the N=60 shape transition

Author

Cruz, S., primary, Wimmer, K., additional, Bhattacharjee, S. S., additional, Bender, P. C., additional, Hackman, G., additional, Krücken, R., additional, Ames, F., additional, Andreoiu, C., additional, Austin, R. A. E., additional, Bancroft, C. S., additional, Braid, R., additional, Bruhn, T., additional, Catford, W. N., additional, Cheeseman, A., additional, Chester, A., additional, Cross, D. S., additional, Diget, C. Aa., additional, Drake, T., additional, Garnsworthy, A. B., additional, Kanungo, R., additional, Knapton, A., additional, Korten, W., additional, Kuhn, K., additional, Lassen, J., additional, Laxdal, R., additional, Marchetto, M., additional, Matta, A., additional, Miller, D., additional, Moukaddam, M., additional, Orr, N. A., additional, Sachmpazidi, N., additional, Sanetullaev, A., additional, Svensson, C. E., additional, Terpstra, N., additional, Unsworth, C., additional, and Voss, P. J., additional

Published
2020
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22. Single-particle structure of neutron-rich Sr isotopes via $^2H(^94,95,96Sr, p)$ reactions

Author

Cruz, S., Wimmer, K., Bender, P. C., Krücken, R., Hackman, G., Ames, F., Andreoiu, C., Bancroft, C. S., Braid, R., Bruhn, T., Catford, W. N., Cheeseman, A., Chester, A., Cross, D. S., Diget, C. Aa, Drake, T., Garnsworthy, A. B., Kanungo, R., Knapton, A., Korten, W., Kuhn, K., Lassen, J., Laxdal, R., Marchetto, M., Matta, A., Miller, D., Moukaddam, M., Orr, N. A., Sachmpazidi, N., Sanetullaev, A., Svensson, C. E., Terpstra, N., and Voss, P. J.

Subjects
Nuclear Experiment
Abstract

Background: The region around neutron number N=60 in the neutron-rich Sr and Zr nuclei is one of the most dramatic examples of a ground-state shape transition from (near) spherical below N=60 to strongly deformed shapes in the heavier isotopes. Purpose: The single-particle structure of Sr95-97 approaching the ground-state shape transition at Sr98 has been investigated via single-neutron transfer reactions using the (d,p) reaction in inverse kinematics. These reactions selectively populate states with a large overlap of the projectile ground state coupled to a neutron in a single-particle orbital. Method: Radioactive Sr94,95,96 nuclei with energies of 5.5 AMeV were used to bombard a CD2, where D denotes H2, target. Recoiling light charged particles and γ rays were detected using a quasi-4π silicon strip detector array and a 12-element Ge array. The excitation energy of states populated was reconstructed employing the missing mass method combined with γ-ray tagging and differential cross sections for final states were extracted. Results: A reaction model analysis of the angular distributions allowed for firm spin assignments to be made for the low-lying 352, 556, and 681 keV excited states in Sr95 and a constraint has been placed on the spin of the higher-lying 1666 keV state. Angular distributions have been extracted for ten states populated in the H2(Sr95,p)Sr96 reaction, and constraints have been provided for the spins and parities of several final states. Additionally, the 0, 167, and 522 keV states in Sr97 were populated through the H2(Sr96,p) reaction. Spectroscopic factors for all three reactions were extracted. Conclusions: Results are compared to shell-model calculations in several model spaces and the structure of low-lying states in Sr94 and Sr95 is well described. The spectroscopic strength of the 0+ and 2+ states in Sr96 is significantly more fragmented than predicted. The spectroscopic factors for the H2(Sr96,p)Sr97 reaction suggest that the two lowest-lying excited states have significant overlap with the weakly deformed ground state of Sr96, but the ground state of Sr97 has a different structure.

Published
2019

26. Shape coexistence and mixing of low-lying 0 States in Sr

Author

Cruz, S., Bender, P.C., Krücken, R., Wimmer, K., Ames, F., Andreoiu, C., Austin, R.A.E., Bancroft, C.S., Braid, R., Bruhn, T., Catford, W.N., Cheeseman, A., Chester, A., Cross, D.S., Diget, C.Aa., Drake, T., Garnsworthy, A.B., Hackman, G., Kanungo, R., Knapton, A., Korten, W., Kuhn, K., Lassen, J., Laxdal, R., Marchetto, M., Matta, A., Miller, D., Moukaddam, M., Orr, N.A., Sachmpazidi, N., Sanetullaev, A., Svensson, C.E., Terpstra, N., Unsworth, C., and Voss, P.J.

Abstract

The low energy excited 02,3+ states in $^{96}$Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2s1/2]2 content of the 01,2,3+ states in $^{96}$Sr was determined by means of the d($^{95}$Sr, p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22(3) were extracted for the $^{96}$Sr ground and 1229 keV 0+ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 03+ state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0+ states in $^{96}$Sr. The strengths of the excited 02,3+ states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a2=0.40(14) and a difference in intrinsic deformations of |Δβ|=0.31(3). These results suggest coexistence of three different configurations in $^{96}$Sr and strong shape mixing of the two excited 0+ states.

Published
2018

27. Single-particle structure of neutron-rich Sr isotopes via H2(Sr94,95,96, p) reactions

Author

Cruz, S., primary, Wimmer, K., additional, Bender, P. C., additional, Krücken, R., additional, Hackman, G., additional, Ames, F., additional, Andreoiu, C., additional, Austin, R. A. E., additional, Bancroft, C. S., additional, Braid, R., additional, Bruhn, T., additional, Catford, W. N., additional, Cheeseman, A., additional, Chester, A., additional, Cross, D. S., additional, Diget, C. Aa., additional, Drake, T., additional, Garnsworthy, A. B., additional, Kanungo, R., additional, Knapton, A., additional, Korten, W., additional, Kuhn, K., additional, Lassen, J., additional, Laxdal, R., additional, Marchetto, M., additional, Matta, A., additional, Miller, D., additional, Moukaddam, M., additional, Orr, N. A., additional, Sachmpazidi, N., additional, Sanetullaev, A., additional, Svensson, C. E., additional, Terpstra, N., additional, Unsworth, C., additional, and Voss, P. J., additional

Published
2019
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28. The GRIFFIN facility for Decay-Spectroscopy studies at TRIUMF-ISAC

Author

Garnsworthy, A.B., primary, Svensson, C.E., additional, Bowry, M., additional, Dunlop, R., additional, MacLean, A.D., additional, Olaizola, B., additional, Smith, J.K., additional, Ali, F.A., additional, Andreoiu, C., additional, Ash, J.E., additional, Ashfield, W.H., additional, Ball, G.C., additional, Ballast, T., additional, Bartlett, C., additional, Beadle, Z., additional, Bender, P.C., additional, Bernier, N., additional, Bhattacharjee, S.S., additional, Bidaman, H., additional, Bildstein, V., additional, Bishop, D., additional, Boubel, P., additional, Braid, R., additional, Brennan, D., additional, Bruhn, T., additional, Burbadge, C., additional, Cheeseman, A., additional, Chester, A., additional, Churchman, R., additional, Ciccone, S., additional, Caballero-Folch, R., additional, Cross, D.S., additional, Cruz, S., additional, Davids, B., additional, Varela, A. Diaz, additional, Dillmann, I., additional, Dunlop, M.R., additional, Evitts, L.J., additional, Garcia, F.H., additional, Garrett, P.E., additional, Georges, S., additional, Gillespie, S., additional, Gudapati, R., additional, Hackman, G., additional, Hadinia, B., additional, Hallam, S., additional, Henderson, J., additional, Ilyushkin, S.V., additional, Jigmeddorj, B., additional, Kilic, A.I., additional, Kisliuk, D., additional, Kokke, R., additional, Kuhn, K., additional, Krücken, R., additional, Kuwabara, M., additional, Laffoley, A.T., additional, Lafleur, R., additional, Leach, K.G., additional, Leslie, J.R., additional, Linn, Y., additional, Lim, C., additional, MacConnachie, E., additional, Mathews, A.R., additional, McGee, E., additional, Measures, J., additional, Miller, D., additional, Mills, W.J., additional, Moore, W., additional, Morris, D., additional, Morrison, L.N., additional, Moukaddam, M., additional, Natzke, C.R., additional, Ortner, K., additional, Padilla-Rodal, E., additional, Paetkau, O., additional, Park, J., additional, Patel, H.P., additional, Pearson, C.J., additional, Peters, E., additional, Peters, E.E., additional, Pore, J.L., additional, Radich, A.J., additional, Rajabali, M.M., additional, Rand, E.T., additional, Raymond, K., additional, Rizwan, U., additional, Ruotsalainen, P., additional, Saito, Y., additional, Sarazin, F., additional, Shaw, B., additional, Smallcombe, J., additional, Southall, D., additional, Starosta, K., additional, Ticu, M., additional, Timakova, E., additional, Turko, J., additional, Umashankar, R., additional, Unsworth, C., additional, Wang, Z.M., additional, Whitmore, K., additional, Wong, S., additional, Yates, S.W., additional, Zganjar, E.F., additional, and Zidar, T., additional

Published
2019
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33. Shape coexistence and mixing of low-lying 0+ states in 96Sr

Author

Cruz, S., primary, Bender, P.C., additional, Krücken, R., additional, Wimmer, K., additional, Ames, F., additional, Andreoiu, C., additional, Austin, R.A.E., additional, Bancroft, C.S., additional, Braid, R., additional, Bruhn, T., additional, Catford, W.N., additional, Cheeseman, A., additional, Chester, A., additional, Cross, D.S., additional, Diget, C.Aa., additional, Drake, T., additional, Garnsworthy, A.B., additional, Hackman, G., additional, Kanungo, R., additional, Knapton, A., additional, Korten, W., additional, Kuhn, K., additional, Lassen, J., additional, Laxdal, R., additional, Marchetto, M., additional, Matta, A., additional, Miller, D., additional, Moukaddam, M., additional, Orr, N.A., additional, Sachmpazidi, N., additional, Sanetullaev, A., additional, Svensson, C.E., additional, Terpstra, N., additional, Unsworth, C., additional, and Voss, P.J., additional

Published
2018
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35. Thermal Stability of Polymer Additives: Comparison of Decomposition Models Including Oxidative Pyrolysis.

Author

Bartsch, N., Girard, M., Wilde, A., Bruhn, T., Kappenstein, O., Vieth, B., Hutzler, C., and Luch, A.

Subjects
LOW density polyethylene, BENZENEDICARBONITRILE, THERMAL stability, TANDEM mass spectrometry, POLYMERS, CONSUMER behavior
Abstract

The thermo‐oxidative stability of widely used polymer additives has been investigated. A comparative analytical approach with classic and innovative decomposition models for polymer additives was conducted and the results supported using quantum‐chemical calculations. Unique pyrolysis products of the analytes were compiled utilizing pyrolysis online coupled to gas chromatography followed by mass spectrometric detection (Pyr‐GC–MS). The pyrolysis was either performed under inert conditions or in an oxygen‐containing atmosphere. Squalane was applied as polymer‐mimicking liquid next to low density polyethylene (LDPE) and polyamide 6 (PA 6) as matrices for 10 selected additives. The additives included in this study range from antioxidants and plasticizers to processing aids. These were selected to address a range of application in consumer products and to cover different chemical classes. The toxicological relevance of additives and potential breakdown products was considered. Consequently, degradation of sterically hindered antioxidants, diarylamines, and a trimellitic acid derivative was investigated. The findings were used to predict the behavior of consumer products made of polymeric materials entailing additives. The level of Antioxidant 2246 [2‐tert‐butyl‐6‐[(3‐tert‐butyl‐2‐hydroxy‐5‐methylphenyl)methyl]‐4‐methylphenol] and one of its predicted decomposition products was determined in baby bottle nipples made of natural rubber [2‐tert‐butyl‐4‐methylphenol] utilizing the complementary technique of gas chromatography coupled to tandem mass spectrometry (GC–MS/MS). This study provides a comprehensive characterization of important polymer additives and enables the prioritization of degradation products for further risk assessment. J. VINYL ADDIT. TECHNOL., 25:E12–E27, 2019. © 2018 The Authors. Journal of Vinyl and Additive Technology published by Wiley Periodicals, Inc. on behalf of Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

Published
2019
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38. CO2 as an Asset?

Author

Olfe-Kräutlein, B., Naims, H., Bruhn, T., Lorente Lafuente, A., and Tobias, M.

Abstract

Carbon dioxide is a harmful greenhouse gas. But it is also the basic ingredient of countless chemical products. In recent years, research on the sequestration and practical use of carbon dioxide has yielded a number of important initial breakthroughs.

Published
2014
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42. Nuclear structure of122Xe studied via high-statisticsβ+/EC-decay

Author

Jigmeddorj, B., primary, Garrett, P.E., additional, Andreoiu, C., additional, Ball, G.C., additional, Bruhn, T., additional, Cross, D.S., additional, Garnsworthy, A.B., additional, Hackman, G., additional, Hadinia, B., additional, Moukaddam, M., additional, Park, J., additional, Pore, J.L., additional, Radich, A.J., additional, Rajabali, M.M., additional, Rand, E.T., additional, Rizman, U., additional, Svensson, C.E., additional, Voss, P., additional, Wang, Z.M., additional, Wood, J.L., additional, and Yates, S.W., additional

Published
2016
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43. New low-spin states of 122Xe observed via high-statistics β-decay of 122Cs.

Author

Jigmeddorj, B., Garrett, P. E., Andreoiu, C., Ball, G. C., Bruhn, T., Cross, D. S., Garnsworthy, A. B., Hadinia, B., Moukaddam, M., Park, J., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Rizwan, U., Svensson, C. E., Voss, P., Wang, Z. M., Wood, J. L., and Yates, S. W.

Subjects
NUCLEAR excitation, ANGULAR momentum (Nuclear physics), PHASE transitions, NUCLEAR physics, STATISTICAL correlation
Abstract

Excited states of 122Xe were studied via the β+/EC decay of 122Cs with the 8πγ-ray spectrometer at the TRIUMF-ISAC facility. Compton-suppressed HPGe detectors were used for measurements of γ-ray intensities, γγ coincidences, and γ-γ angular correlations. Two sets of data were collected to optimize the decays of the ground (21.2 s) and isomeric (3.7 min) states of 122Cs. The data collected have enabled the observation of about 505 new transitions and about 250 new levels, including 51 new low-spin states. Spin assignments have been made for 58 low-spin states based on the deduced β-decay feeding and γ-γ angular correlation analyses. [ABSTRACT FROM AUTHOR]

Published
2018
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45. APETx1, a new toxin from the sea anemone Anthopleura elegantissima, which blocks voltage-gated HERG potassium channels

Author

Diochot, S., Loret, E., Bruhn, T., Béress, L., Lazdunski, M., Institut de pharmacologie moléculaire et cellulaire (IPMC), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de biologie structurale et microbiologie (IBSM), Université de la Méditerranée - Aix-Marseille 2-Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Abteilung Toxikoligie, Klinikum der Christian-Albrechts-Universität, and Université Nice Sophia Antipolis (... - 2019) (UNS)

Published
2003

46. Nuclear structure of 122Xe studied via high-statistics β+/EC-decay.

Author

Jigmeddorj, B., Garrett, P. E., Andreoiu, C., Ball, G. C., Bruhn, T., Cross, D. S., Garnsworthy, A. B., Hackman, G., Hadinia, B., Moukaddam, M., Park, J., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Rizman, U., Svensson, C. E., Voss, P., Wang, Z. M., and Wood, J. L.

Subjects
NUCLEAR structure, RADIOACTIVE decay, NUCLEAR excitation, NUCLEAR reactions, NUCLEAR physics
Abstract

The nuclear structure of 122Xe has been investigated with measurements of the β+/EC decay of 122Cs with the 8π γ-ray spectrometer at the TRIUMF-ISAC facility. The data collected have enabled the determination of relative B(E2) values of some low-energy transitions, and the in-band transitions of the excited 0+ bands have been observed. As a result, the 2+ rotational band members for the 0+2 and 0+3 states have been firmly identified. [ABSTRACT FROM AUTHOR]

Published
2016
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50. Iminopropadienones R–NCCCO and carbon suboxide, C3O2. Theoretical and experimental 13C NMR spectra

Author

Koch, R., Bruhn, T., Veedu, R.N., Wentrup, C., Koch, R., Bruhn, T., Veedu, R.N., and Wentrup, C.

Abstract

The 13C NMR data of five iminopropadienones R–N6-point double bond; length half of m-dashC6-point double bond; length half of m-dashC6-point double bond; length half of m-dashC6-point double bond; length half of m-dashO as well as carbon suboxide, C3O2, have been examined theoretically and experimentally. The best theoretical results were obtained using the GIAO/B3LYP/6-31+G**//MP2/6-31G* level of theory, which reproduces the chemical shifts of the iminopropadienone substituents extremely well while underestimating those of the cumulenic carbons by 5–10 ppm. The computationally faster GIAO/HF/6-31+G**//B3LYP/6-31G* level is also adequate.

Published
2004

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