1,083 results on '"Svensson, C."'
Search Results
2. High-precision half-life determination of 14βO via direct 14β counting
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Sharma, S., Grinyer, G. F., Ball, G. C., Leslie, J. R., Svensson, C. E., Ali, F. A., Andreoiu, C., Bernier, N., Bhattacharjee, S. S., Bildstein, V., Burbadge, C., Caballero-Folch, R., Coleman, R., Varela, A. Diaz, Dunlop, M. R., Dunlop, R., Garnsworthy, A. B., Fuakye, E. Gyabeng, Huber, G. M., Jigmeddorj, B., Kapoor, K., Laffoley, A. T., Leach, K. G., Long, J., MacLean, A. D., Natzke, C. R., Olaizola, B., Radich, A. J., Saei, N., Smallcombe, J. T., Talebitaher, A., Whitmore, K., and Zidar, T.
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- 2022
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3. Veterinary herd health management–Experience among farmers and farm managers in Swedish dairy production
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Svensson, C., Alvåsen, K., Eldh, A.C., Frössling, J., and Lomander, H.
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- 2018
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4. Decay Spectroscopy of $^{160}$Eu: Quasiparticle Configurations of Excited States and Structure of $K^\pi$=$4^+$ Band-heads in $^{160}$Gd
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Yates, D., Kruecken, R., Dillmann, I., Garrett, P. E., Olaizola, B., Vedia, V., Ali, F. A., Andreoiu, C., Ashfield, W., Ball, G. C., Beadle, Z., Bernier, N., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Bishop, D., Bowry, M., Burbadge, C., Caballero-Folch, R., Chaney, D. Z., Cross, D. C., Varela, A. Diaz, Dunlop, M. R., Dunlop, R., Evitts, L. J., Garcia, F. H., Garnsworthy, A. B., Georges, S., Gillespie, S. A., Hackman, G., Henderson, J., Jigmeddorj, S., Lassen, J., Li, R., Luna, B. K., MacLean, A. D., Natzke, C. R., Petrache, C. M., Radich, A. J., Rajabali, M. M., Regan, P. H., Saito, Y., Smallcombe, J., Smith, J. K., Spieker, M., Svensson, C. E., Whitmore, A. Teigelhoefer K., and Zidar, T.
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FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment - Abstract
\noindent \textbf{Background:} Detailed spectroscopy of neutron-rich, heavy, deformed nuclei is of broad interest for nuclear astrophysics and nuclear structure. Nuclei in the r-process path and following freeze-out region impact the resulting r-process abundance distribution, and the structure of nuclei midshell in both proton and neutron number helps to understand the evolution of subshell gaps and large deformation in these nuclei. \noindent \textbf{Purpose:} To improve the understanding of the nuclear structure of $^{160}$Gd, specifically the $K^\pi$=$4^+$ bands, as well as study the $\beta$-decay of $^{160}$Eu into $^{160}$Gd. \noindent \textbf{Methods:} High-statistics decay spectroscopy of $^{160}$Gd resulting from the $\beta$-decay of $^{160}$Eu was collected using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. \noindent \textbf{Results:} Two new excited states and ten new transitions were observed in $^{160}$Gd. The $\beta$-decaying half-lives of the low- and high-spin isomer in $^{160}$Eu were determined, and the low-spin state's half-life was measured to be $t_{1/2}=26.0(8)$~s, $\sim$16\% shorter than previous measurements. Lifetimes of the two $K^\pi$=$4^+$ band-heads in $^{160}$Gd were measured for the first time, as well as $\gamma$-$\gamma$ angular correlations and mixing ratios of intense transitions out of those band-heads. \noindent \textbf{Conclusions:} Lifetimes and mixing ratios suggest that the hexadecapole phonon model of the $K^\pi$=$4^+$ band-heads in $^{160}$Gd is preferred over a simple two-state strong mixing scenario, although further theoretical calculations are needed to fully understand these states. Additionally, the 1999.0 keV state in $^{160}$Gd heavily populated in $\beta$-decay is shown to have positive parity, which raises questions regarding the structure of the high-spin $\beta$-decaying state in $^{160}$Eu.
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- 2023
5. Cross Sections of the $^{83}$Rb(p,$\gamma)^{84}$Sr and $^{84}$Kr(p,$\gamma)^{85}$Rb Reactions at Energies Characteristic of the Astrophysical $\gamma$ Process
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Williams, M., Davids, B., Lotay, G., Nishimura, N., Rauscher, T., Gillespie, S. A., Alcorta, M., Amthor, A. M., Ball, G. C., Bhattacharjee, S. S., Bildstein, V., Catford, W. N., Doherty, D. T., Esker, N. E., Garnsworthy, A. B., Hackman, G., Hudson, K., Lennarz, A., Natzke, C., Olaizola, B., Psaltis, A., Svensson, C. E., Williams, J., Walter, D., and Yates, D.
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Astrophysics - Solar and Stellar Astrophysics ,Nuclear Experiment - Abstract
We have measured the cross section of the $^{83}$Rb(p,$\gamma)^{84}$Sr radiative capture reaction in inverse kinematics using a radioactive beam of $^{83}$Rb at incident energies of 2.4 and $2.7 A$ MeV. Prior to the radioactive beam measurement, the $^{84}$Kr(p,$\gamma)^{85}$Rb radiative capture reaction was measured in inverse kinematics using a stable beam of $^{84}$Kr at an incident energy of $2.7 A$ MeV. The effective relative kinetic energies of these measurements lie within the relevant energy window for the $\gamma$ process in supernovae. The central values of the measured partial cross sections of both reactions were found to be $0.17-0.42$ times the predictions of statistical model calculations. Assuming the predicted cross section at other energies is reduced by the same factor leads to a slightly higher calculated abundance of the $p$ nucleus $^{84}$Sr, caused by the reduced rate of the $^{84}$Sr($\gamma$,p)$^{83}$Rb reaction derived from the present measurement., Comment: 11 pages, 11 figures. arXiv admin note: text overlap with arXiv:2109.06775
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- 2023
6. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in $^{74}$Zn: Suggestion for a Northern Extension of the $N=40$ Island of Inversion
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Rocchini, M., Garrett, P. E., Zielinska, M., Lenzi, S. M., Dao, D. D., Nowacki, F., Bildstein, V., MacLean, A. D., Olaizola, B., Ahmed, Z. T., Andreoiu, C., Babu, A., Ball, G. C., Bhattacharjee, S. S., Bidaman, H., Cheng, C., Coleman, R., Dillmann, I., Garnsworthy, A. B., Gillespie, S., Griffin, C. J., Grinyer, G. F., Hackman, G., Hanley, M., Illana, A., Jones, S., Laffoley, A. T., Leach, K. G., Lubna, R. S., McAfee, J., Natzke, C., Pannu, S., Paxman, C., Porzio, C., Radich, A. J., Rajabali, M. M., Sarazin, F., Schwarz, K., Shadrick, S., Sharma, S., Suh, J., Svensson, C. E., Yates, D., Zidar, T., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
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Nuclear Theory (nucl-th) ,Nuclear Theory ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment - Abstract
International audience; The excited states of $N=44$$^{74}$Zn were investigated via $\gamma$-ray spectroscopy following $^{74}$Cu $\beta$ decay. By exploiting $\gamma$-$\gamma$ angular correlation analysis, the $2_2^+$, $3_1^+$, $0_2^+$ and $2_3^+$ states in $^{74}$Zn were firmly established. The $\gamma$-ray branching and $E2/M1$ mixing ratios for transitions de-exciting the $2_2^+$, $3_1^+$ and $2_3^+$ states were measured, allowing for the extraction of relative $B(E2)$ values. In particular, the $2_3^+ \to 0_2^+$ and $2_3^+ \to 4_1^+$ transitions were observed for the first time. The results show excellent agreement with new microscopic large-scale shell-model calculations, and are discussed in terms of underlying shapes, as well as the role of neutron excitations across the $N=40$ gap. Enhanced axial shape asymmetry (triaxiality) is suggested to characterize $^{74}$Zn in its ground state. Furthermore, an excited $K=0$ band with a significantly larger softness in its shape is identified. A shore of the $N=40$``island of inversion'' appears to manifest above $Z=26$, previously thought as its northern limit in the chart of the nuclides.
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- 2023
7. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in Zn74: Suggestion for a Northern Extension of the N=40 Island of Inversion
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Rocchini, M., Garrett, P. E., Zielińska, M., Lenzi, S. M., Dao, D. D., Nowacki, F., Bildstein, V., Maclean, A. D., Olaizola, B., Ahmed, Z. T., Andreoiu, C., Babu, A., Ball, G. C., Bhattacharjee, S. S., Bidaman, H., Cheng, C., Coleman, R., Dillmann, I., Garnsworthy, A. B., Gillespie, S., Griffin, C. J., Grinyer, G. F., Hackman, G., Hanley, M., Illana, A., Jones, S., Laffoley, A. T., Leach, K. G., Lubna, R. S., Mcafee, J., Natzke, C., Pannu, S., Paxman, C., Porzio, C., Radich, A. J., Rajabali, M. M., Sarazin, F., Schwarz, K., Shadrick, S., Sharma, S., Suh, J., Svensson, C. E., Yates, D., and Zidar, T.
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- 2023
8. Erratum to: New decay modes of the high-spin isomer of 124Cs
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Radich, A. J., Garrett, P. E., Andreoiu, C., Ball, G. C., Bianco, L., Bildstein, V., Chagnon-Lessard, S., Cross, D. S., Demand, G. A., Diaz Varela, A., Dunlop, R., Finlay, P., Garnsworthy, A. B., Hackman, G., Hadinia, B., Jigmeddorj, B., Laffoley, A. T., Leach, K. G., McGee, E., Michetti-Wilson, J., Orce, J. N., Rajabali, M. M., Rand, E. T., Starosta, K., Sumithrarachchi, C. S., Svensson, C. E., Triambak, S., Wang, Z. M., Williams, S. J., Wong, J., Wood, J. L, and Yates, S. W.
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- 2018
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9. E0 transition strengths in 110Pd
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Smallcombe, J., Berean-Dutcher, J., Moukaddam, M., Garnsworthy, A. B., Andreoiu, C., Caballero-Folch, R., Drake, T. E., Evitts, L. J., Hackman, G., Henderson, J., Kurkjian, A., Olaizola, B., Peters, E. E., Southall, D., Ruotsalainen, P., Svensson, C. E., Wiens, M., Yates, S. W., and Zidar, T.
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- 2018
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10. Study of the β - decay of 116m1In: A new interpretation of low-lying 0+ states in 116Sn
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Pore, J. L., Cross, D. S., Andreoiu, C., Ashley, R., Ball, G. C., Bender, P. C., Chester, A. S., Diaz Varela, A., Demand, G. A., Dunlop, R., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Hadinia, B., Jigmeddorj, B., Laffoley, A. T., Liblong, A., Kanungo, R., Noakes, B., Petrache, C. M., Rajabali, M. M., Starosta, K., Svensson, C. E., Voss, P. J., Wang, Z. M., Wood, J. L., and Yates, S. W.
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- 2017
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11. Improved measurement of the 02+→01+ E0 transition strength for Se 72 using the SPICE spectrometer
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Smallcombe, J., Garnsworthy, A. B., Korten, W., Singh, P., Ali, F. A., Andreoiu, C., Ansari, S., Ball, G. C., Barton, C. J., Bhattacharjee, S. S., Bowry, M., Caballero-Folch, R., Chester, A., Gillespie, S. A., Grinyer, G. F., Hackman, G., Jones, C., Melon, B., Moukaddam, M., Nannini, A., Ruotsalainen, P., Starosta, K., Svensson, C. E., Wadsworth, R., and Williams, J.
- Abstract
The selenium isotopes lie at the heart of a tumultuous region of the nuclear chart where shape coexistence effects grapple with neutron-proton pairing correlations, triaxiality, and the impending proton drip line. In this work, a study of Se72 by internal conversion electron and γ-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the 02+ state were performed, yielding a determination of ρ2(E0;02+→01+)=29(3) milliunits. Two-state mixing calculations were performed that highlighted the importance of interpretation of such E0 strength values in the context of shape coexistence.
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- 2022
12. High-precision half-life determination of $^{14}$O via direct $\beta $ counting
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Sharma, S., Grinyer, G. F., Ball, G. C., Leslie, J. R., Svensson, C. E., Ali, F. A., Andreoiu, C., Bernier, N., Bhattacharjee, S. S., Bildstein, V., Burbadge, C., Caballero-Folch, R., Coleman, R., Varela, A. Diaz, Dunlop, M. R., Dunlop, R., Garnsworthy, A. B., Fuakye, E. Gyabeng, Huber, G. M., Jigmeddorj, B., Kapoor, K., Laffoley, A. T., Leach, K. G., Long, J., MacLean, A. D., Natzke, C. R., Olaizola, B., Radich, A. J., Saei, N., Smallcombe, J. T., Talebitaher, A., Whitmore, K., and Zidar, T.
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Nuclear and High Energy Physics ,Nuclear Physics - Experiment ,nucl-ex ,Nuclear Experiment - Abstract
The half-life of the superallowed Fermi $\beta^+$ emitter $^{14}$O was determined to high precision via a direct $\beta$ counting experiment performed at the Isotope Separator and Accelerator (ISAC) facility at TRIUMF. The result, $T_{1/2}$($^{14}$O) = 70619.2(76) ms, is consistent with, but is more precise than, the world average obtained from 11 previous measurements. Combining the $^{14}$O half-life deduced in the present work with the previous most precise measurements of this quantity leads to a reduction in the overall uncertainty, by nearly a factor of 2. The new world average is $T_{1/2}$($^{14}$O) = 70619.6(63) ms with a reduced $\chi^2$ value of 0.87 obtained from 8 degrees of freedom., Comment: 8 pages, 6 figures, accepted for publication in the European Physical Journal A
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- 2022
13. Validation of an air–liquid interface toxicological set-up using Cu, Pd, and Ag well-characterized nanostructured aggregates and spheres
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Svensson, C. R., Ameer, S. S., Ludvigsson, L., Ali, N., Alhamdow, A., Messing, M. E., Pagels, J., Gudmundsson, A., Bohgard, M., Sanfins, E., Kåredal, M., Broberg, K., and Rissler, J.
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- 2016
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14. Conversion electron study of 110Cd: Evidence of new E0 branches
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Jigmeddorj, B., Garrett, P. E., Diaz Varela, A., Ball, G. C., Bangay, J. C., Cross, D. S., Demand, G. A., Garnsworthy, A. B., Green, K. L., Hackman, G., Kulp, W. D., Leach, K. G., Orce, J. N., Rand, E. T., Sumithrarachchi, C., Svensson, C. E., Triambak, S., Wong, J., Wood, J. L., and Yates, S. W.
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- 2016
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15. New decay modes of the high-spin isomer of 124Cs
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Radich, A. J., Garrett, P. E., Andreoiu, C., Ball, G. C., Bianco, L., Bildstein, V., Chagnon-Lessard, S., Cross, D. S., Demand, G. A., Diaz Varela, A., Dunlop, R., Finlay, P., Garnsworthy, A. B., Hackman, G., Hadinia, B., Jigmeddorj, B., Laffoley, A. T., Leach, K. G., McGee, E., Michetti-Wilson, J., Orce, J. N., Rajabali, M. M., Rand, E. T., Starosta, K., Sumithrarachchi, C. S., Svensson, C. E., Triambak, S., Wang, Z. M., Williams, S. J., Wong, J., Wood, J. L, and Yates, S. W.
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- 2017
- Full Text
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16. Improved measurement of the 02+→01+ E0 transition strength for 72Se using the SPICE spectrometer
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Smallcombe, J., Garnsworthy, A. B., Korten, W., Singh, P., Ali, F. A., Andreoiu, C., Ansari, S., Ball, G. C., Barton, C. J., Bhattacharjee, S. S., Bowry, M., Caballero-Folch, R., Chester, A., Gillespie, S. A., Grinyer, G. F., Hackman, G., Jones, C., Melon, B., Moukaddam, M., Nannini, A., Ruotsalainen, P., Starosta, K., Svensson, C. E., Wadsworth, R., and Williams, J.
- Subjects
isotoopit ,seleeni ,spektroskopia ,ydinfysiikka - Abstract
The selenium isotopes lie at the heart of a tumultuous region of the nuclear chart where shape coexistence effects grapple with neutron-proton pairing correlations, triaxiality, and the impending proton drip line. In this work, a study of 72Se by internal conversion electron and γ-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the 02+ state were performed, yielding a determination of ρ2(E0;02+→01+)=29(3) milliunits. Two-state mixing calculations were performed that highlighted the importance of interpretation of such E0 strength values in the context of shape coexistence. peerReviewed
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- 2022
17. Coulomb excitation of the |Tz|=1/2, A=23 mirror pair
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Henderson, J., Hackman, G., Ruotsalainen, P., Holt, J. D., Stroberg, S. R., Andreoiu, C., Ball, G. C., Bernier, N., Bowry, M., Caballero-Folch, R., Cruz, S., Diaz, Varela A., Evitts, L. J., Frederick, R., Garnsworthy, A. B., Holl, M., Lassen, J., Measures, J., Olaizola, B., O'Sullivan, E., Paetkau, O., Park, J., Smallcombe, J., Svensson, C. E., Whitmore, K., and Wu, C. Y.
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Nuclear Theory ,ydinfysiikka - Abstract
Background: Electric-quadrupole (E2) strengths relate to the underlying quadrupole deformation of a nucleus and present a challenge for many nuclear theories. Mirror nuclei in the vicinity of the line of N=Z represent a convenient laboratory for testing deficiencies in such models, making use of the isospin symmetry of the systems. Purpose: Uncertainties associated with literature E2 strengths in 23Mg are some of the largest in Tz=∣∣12∣∣ nuclei in the sd shell. The purpose of the present paper is to improve the precision with which these values are known, to enable better comparison with theoretical models. Methods: Coulomb-excitation measurements of 23Mg and 23Na were performed at the TRIUMF-ISAC facility using the TIGRESS spectrometer. They were used to determine the E2 matrix elements of mixed E2/M1 transitions. Results: Reduced E2 transition strengths, B(E2), were extracted for 23Mg and 23Na. Their precision was improved by factors of approximately 6 for both isotopes, while agreeing within uncertainties with previous measurements. Conclusions: A comparison was made with both shell-model and ab initio valence-space in-medium similarity renormalization group calculations. Valence-space in-medium similarity renormalization group calculations were found to underpredict the absolute E2 strength, in agreement with previous studies. peerReviewed
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- 2022
18. The significance of sampling time in therapeutic drug monitoring of clozapine
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Jakobsen, M. I., Larsen, J. R., Svensson, C. K., Johansen, S. S., Linnet, K., Nielsen, J., and Fink-Jensen, A.
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- 2017
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19. Coulomb excitation of and a change in structure approaching N = Z = 40
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Gillespie, S. A., Henderson, J., Abrahams, K., Ali, F. A., Atar, L., Ball, G. C., Bernier, N., Bhattcharjee, S. S., Caballero-Folch, R., Bowry, M., Chester, A., Coleman, R., Drake, T., Dunling, E., Garnsworthy, A. B., Greaves, B., Grinyer, G. F., Hackman, G., Kasanda, E., LaFleur, R., Masango, S., Muecher, D., Ngwetsheni, C., Ntshangase, S. S., Olaizola, B., Orce, J. N., Rockman, T., Saito, Y., Sexton, L., Šiurytė, P., Smallcombe, J., Smith, J. K., Svensson, C. E., Timakova, E., Wadsworth, R., Williams, J., Winokan, M. S.C., Wu, C. Y., and Zidar, T.
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Physics::Atomic Physics ,Nuclear Experiment - Abstract
Background: Nuclei approaching are known to exhibit strongly deformed structures and are thought to be candidates for shape coexistence. In the krypton isotopes, are poorly characterized, preventing an understanding of evolving deformation approaching . Purpose: The present work aims to determine electric quadrupole transition strengths and quadrupole moments of in order to better characterize their deformation. Conclusions: Comparison of measured and values indicates that neutron-deficient () isotopes of krypton are closer to axial deformation than other isotopic chains in the mass region. A continuation of this trend to higher may result in Sr and Zr isotopes exhibiting near-axial prolate deformation. Methods: Sub-barrier Coulomb excitation was employed, impinging the isotopes of krypton on and targets. Utilizing a semiclassical description of the safe Coulomb-excitation process matrix elements could then be determined. Results: Eleven new or improved matrix elements are determined in and seven in . The new value in disagrees with the evaluated value by , which can be explained in terms of deficiencies in a previous Coulomb-excitation analysis.
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- 2021
20. Experimental study of the nature of the and excited states in using the reaction in inverse kinematics
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Kuhn, K., Sarazin, F., Nunes, F. M., Alvarez, M. A.G., Andreoiu, C., Bardayan, D. W., Bender, P. C., Blackmon, J. C., García Borge, María José, Braid, R., Brown, B. A., Catford, W. N., Diget, C. Aa., Di Pietro, A., Drake, T. E., Figuera, P., Garnsworthy, A.B., Gómez-Camacho, Joaquín, Hackman, G., Hager, U., Ilyushkin, S. V., Nácher, Enrique, O'Malley, P. D., Perea, Ángel, Pesudo, V., Pittman, S. T., Smalley, D., Svensson, C. E., Tengblad, Olof, Thompson, P., Unsworth, C., Wang, Z. M., Department of Energy (US), Colorado School of Mines, Oak Ridge National Laboratory (US), National Nuclear Security Administration (US), National Science Foundation (US), Natural Sciences and Engineering Research Council of Canada, Canada Foundation for Innovation, British Columbia Knowledge Development Fund, Istituto Nazionale di Fisica Nucleare, Agencia Estatal de Investigación (España), Sarazin, F., and Sarazin, F. [0000-0001-5614-1986]
- Abstract
10 pags., 8 figs., 4 tabs., The nature of the and excited states in is studied using the transfer reaction in inverse kinematics at 10A MeV at TRIUMF ISAC-II, in particular to assess whether either of them can be considered as an excited halo state. The angular distributions for both states are extracted using deuteron- coincidences and analyzed using a transfer model taking into account one-step and two-step processes. A good fit of the angular distributions is obtained considering only the one-step process, whereby an inner neutron of is removed, leaving the halo neutron intact. Higher-order processes however cannot be rejected. The small spectroscopic factors extracted suggest that the structure of both states is not uniquely halo-like, but rather display a more complex configuration mixing cluster and halo structures. Further insights are limited, as this experiment specifically probed the halo-like (but not cluster-like) configuration in both states., This work was partially supported by the U.S. Department of Energy (DOE) through Grants/Contracts No. DE-FG03-93ER40789 (Colorado School of Mines), No. DEFG02-96ER40978 (Louisiana State), No. DE-SC0021422 (Michigan State), No. DE-AC05-00OR22725 (Oak Ridge National Laboratory), the National Nuclear Security Administration (NNSA) under the Stewardship Science Academic Alliances program through U.S. DOE Cooperative Agreements No. DE-FG52-08NA28552, and the National Science Foundation under Grant No. PHY-1811815 (Michigan State). This work is also supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Foundation for Innovation (CFI), the British Columbia Knowledge and Development Fund (BCKDF), the Italian National Institute for Nuclear Physics (INFN), the Spanish Ministry of Science and Innovation and FEDER funds under Projects RTI2018-098117-B-C21 and PGC2018-096994-BC21, and the Spanish Agency of Research (AEI) via Project No. PID2019-104714GB-C21.
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- 2021
21. $^{145}$Ba and $^{145, 146}$La structure from lifetime measurements
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Olaizola, B., Babu, A., Umashankar, R., Garnsworthy, A. B., Ball, G. C., Bildstein, V., Bowry, M., Burbadge, C., Cabellero-Folch, R., Dillmann, I., Diaz-Varela, A., Dunlop, R., Estrad��, A., Garrett, P. E., Hackman, G., MacLean, A. D., Measures, J., Pearson, C. J., Shaw, B., Southall, D., Svensson, C. E., Turko, J., Whitmore, K., and Zidar, T.
- Subjects
FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment - Abstract
The occurrence of octupole shapes in even-mass neutron-rich Ba isotopes has been well established. However, the situation with the odd-mass Ba and odd or odd-odd La nuclei around them is far from settled. In order to shed light on these less-studied isotopes, a fast-timing experiment was performed using GRIFFIN at TRIUMF-ISAC. A wealth of excited-state lifetimes in the 100~ps to few ns range have been measured in $^{144, 145, 146}$Ba and $^{145,146}$La populated in the $\beta^-$ and $\beta^--n$ decay of $^{145,146}$Cs. The results do not allow to draw firm conclusions on the possible octupole deformation of these nuclei but suggest different spin and parity assignments than previous works. This work highlights the need for more detailed study of the odd and odd-odd isotopes in this region to properly understand their structure., Comment: 16 pages, 7 figures
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- 2021
22. New low-spin states of 122Xe observed via high-statistics β-decay of 122Cs
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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.
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- 2018
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23. First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos
- Author
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Randhawa, J. S., Kanungo, R., Refsgaard, J., Mohr, P., Ahn, T., Alcorta, M., Andreoiu, C., Bhattacharjee, S. S., Davids, B., Christian, G., Chen, A. A., Coleman, R., Garrett, P., Grinyer, G. F., Fuakye, E. Gyabeng, Hackman, G., Jain, R., Kapoor, K., Krücken, R., Laffoley, A., Lennarz, A., Liang, J., Meisel, Z., Nikhil, N., Psaltis, A., Radich, A., Rocchini, M., Saei, N., Saxena, M., Singh, M., Svensson, C., Subramaniam, P., Talebitaher, A., Upadhyayula, S., Waterfield, C., Williams, J., and Williams, M.
- Subjects
Nuclear Experiment - Abstract
Reactions on the proton-rich nuclides drive the nucleosynthesis in Core-Collapse Supernovae (CCSNe) and in X-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the interstellar medium and hence are a potential inventory of p-nuclei, whereas in XRBs nucleosynthesis powers the light curves. In both astrophysical sites the Ni-Cu cycle, which features a competition between $^{59}$Cu(p,$\alpha$)$^{56}$Ni and $^{59}$Cu(p,$\gamma$)$^{60}$Zn, could potentially halt the production of heavier elements. Here, we report the first direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni using a re-accelerated $^{59}$Cu beam and cryogenic solid hydrogen target. Our results show that the reaction proceeds predominantly to the ground state of $^{56}$Ni and the experimental rate has been found to be lower than Hauser-Feshbach-based statistical predictions. New results hint that the $\nu p$-process could operate at higher temperatures than previously inferred and therefore remains a viable site for synthesizing the heavier elements.
- Published
- 2021
24. The effect of gabapentin and ketorolac on allodynia and conditioned place preference in antibody-induced inflammation
- Author
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Park, H. J., Sandor, K., McQueen, J., Woller, S. A., Svensson, C. I., Corr, M., and Yaksh, T. L.
- Published
- 2016
- Full Text
- View/download PDF
25. The GRIFFIN spectrometer
- Author
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Svensson, C. E. and Garnsworthy, A. B.
- Published
- 2014
- Full Text
- View/download PDF
26. The TRIUMF-ISAC gamma-ray escape suppressed specrometer, TIGRESS
- Author
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Hackman, G. and Svensson, C. E.
- Published
- 2014
- Full Text
- View/download PDF
27. The radon EDM apparatus
- Author
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Tardiff, E. R., Rand, E. T., Ball, G. C., Chupp, T. E., Garnsworthy, A. B., Garrett, P., Hayden, M. E., Kierans, C. A., Lorenzon, W., Pearson, M. R., Schaub, C., and Svensson, C. E.
- Published
- 2014
- Full Text
- View/download PDF
28. Low-, medium-, and high-spin states in the N=Z+1 nucleus 63Ga
- Author
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Rudolph, D., Ragnarsson, I., Clark, R. M., Andreoiu, C., Carpenter, M. P., Ekman, J., Fahlander, C., Kondev, F. G., Lauritsen, T., Sarantites, D. G., Seweryniak, D., and Svensson, C. E.
- Subjects
N=Z nuclei ,gamma-ray spectroscopy ,Nuclear Theory ,Subatomic Physics ,Nuclear Experiment ,nuclear structure and decays - Abstract
The fusion-evaporation reaction 28Si+40Ca at 122 MeV beam energy was used to populate excited states in the N=Z+1 nucleus 63Ga. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array, the level scheme of 63Ga was extended by more than a factor of two in terms of number of γ-ray transitions and excited states, excitation energy (Ex>30 MeV), and angular momentum (I>30 ℏ). Nine regular sequences of states were newly established in the high-spin part of the level scheme. The majority of these rotational band structures could be connected to the previously known part of the level scheme by high-energy γ-ray transitions in the energy range Eγ=4–6 MeV. Low-spin states were assessed by shell-model calculations. The high-spin rotational bands were interpreted and classified by means of cranked Nilsson-Strutinsky calculations.
- Published
- 2021
29. Cryptosporidium parvum and Giardia intestinalis in Calf Diarrhoea in Sweden
- Author
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de Verdier K, Christensson B, Svensson C, and Björkman C
- Subjects
Cryptosporidium parvum ,Giardia intestinalis ,rotavirus ,coronavirus ,Escherichia coli ,calf diarrhoea ,Veterinary medicine ,SF600-1100 - Abstract
The objective of this study conducted in 75 herds was to investigate the presence and significance of Cryptosporidium parvum and Giardia intestinalis in Swedish dairy calves in comparison with rotavirus, coronavirus and Escherichia coli K99+. The farmers were asked to collect faecal samples from each heifer calf that had diarrhoea between birth and 90 days of age, and also from a healthy calf of the same age. In total, 270 samples were collected and analysed. C. parvum, either alone or together with G. intestinalis and/or rotavirus, was detected in 16 (11%) and 6 (5%) of the samples from diarrhoeic and healthy calves, respectively. Even though a higher proportion of diarrhoeic calves shed C. parvum, the difference between the groups was not statistically significant (p = 0.067), possibly due to the low number of positive samples. G. intestinalis was found in 42 (29%) of the diarrhoea samples and in 29 (23%) of the samples from healthy calves. Rotavirus and coronavirus were demonstrated in 24% and 3% of the diarrhoea samples, respectively, whereas E. coli K99+ was only found in samples from 2 healthy calves. C. parvum and G. intestinalis were found in samples from calves 7 to 84 days of age and during all seasons. The results confirm that C. parvum is present in Swedish dairy herds and might have clinical significance. G. intestinalis was the most common agent found but the importance of this parasite remains unclear. Both parasites have suggested zoonotic potential and thus warrant further attention. In addition, rotavirus is a major pathogen in neonatal enteritis in Sweden, whereas coronavirus and E. coli K99+ seem to be of less importance.
- Published
- 2003
- Full Text
- View/download PDF
30. Spinal release of tumour necrosis factor activates c-Jun N-terminal kinase and mediates inflammation-induced hypersensitivity
- Author
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Bas, D. B., Abdelmoaty, S., Sandor, K., Codeluppi, S., Fitzsimmons, B., Steinauer, J., Hua, X. Y., Yaksh, T. L., and Svensson, C. I.
- Published
- 2015
- Full Text
- View/download PDF
31. Housing, Feeding and Management of Calves and Replacement Heifers in Swedish Dairy Herds
- Author
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Liberg P, Svensson C, and Pettersson K
- Subjects
colostrum ,wearing ,rearing ,breeding ,feed plan ,pasture. ,Veterinary medicine ,SF600-1100 - Abstract
A questionnaire was sent to 1500 randomly selected dairy herds in Sweden, asking for general information about the herds, including routines from birth to first calving and also routines at breeding, calving and during the grazing period. Fifty-eight percent of the questionnaires were returned. The preweaned calves were kept in individual calf pens in 68% and in group housing systems in 28% of the herds. Pens with slatted floors were the main housing system for replacement heifers from weaning to breeding, and tie stalls from breeding to first calving. Whole milk was used in 44% and milk replacements in 42% of the herds. The calves received, as a median, 2.5 litres of milk per meal and 2 meals per day. The median age at weaning was 8 weeks. Age was the single most common criteria used for deciding both weaning and breeding time. The median age when the heifers were first turned out to pasture was 6 months. Prophylactic anthelmintic treatment was used by 65% of the herds. The most common diet for replacement heifers before calving was a combination of grain, hay and silage.
- Published
- 2001
- Full Text
- View/download PDF
32. Veterinary herd health management—Experiences and perceptions among Swedish dairy cattle veterinarians.
- Author
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Svensson, C., Lomander, H., and Kokko, Suvi
- Subjects
- *
ANIMAL herds , *DAIRY cattle , *VETERINARIANS , *SENSORY perception , *CAPACITY building , *CATTLE crossbreeding - Abstract
Cattle veterinarians have long been encouraged to take on a role as proactive health consultants. However, the process so far has been slow in Sweden and elsewhere, and only a rather small proportion of cattle work conducted by veterinarians involves veterinary herd health management (VHHM). The aims of this exploratory study were to explore Swedish cattle veterinarians' interpretation of VHHM services and to understand the factors that might affect the extent to which cattle veterinarians perform VHHM. Six focus group discussions with cattle veterinarians complemented with 5 individual telephone interviews with clinic managers were conducted in 2020. In total, 33 cattle veterinarians participated, all employed by the largest employer of Swedish cattle veterinarians: Distriktsveterinärerna (Swedish Board of Agriculture). Participants were chosen from 6 geographical regions with the aim to present variations in gender, age, country of education, proportion of dairy cattle work at the clinic, experience in the veterinary profession, and experience in work with dairy herds and in VHHM. The focus group discussions and interviews were recorded and these recordings were transcribed and analyzed thematically. Participants interpreted VHHM as work associated with the process of advising and included both ad hoc advising and more strategic forms of services. Prebooked visits per se were not seen as VHHM. We identified 4 different themes among the factors affecting the extent of VHHM services: (1) farmer trust and demand ; (2) veterinary competence ; (3) time available for VHHM ; and (4) the individual veterinarian's commitment and motivation. To gain farmers' trust and to create a demand for VHHM services, the results of VHHM work and the veterinarian's competence were deemed central by the participants. The veterinarians' skills in communication and relation building were considered especially important. Some farmers were perceived as having little interest in, or lacking deeper knowledge about, VHHM services. The promotion of VHHM services was mentioned as an important factor to increase farmer demand. Participants described VHHM as work demanding high skills and continuous capacity development. Veterinarians' personal commitment and motivation were also described as important for the extent to which VHHM services were performed. This was in turn affected by the psychosocial work environment (e.g., workload, interest and recognition from farmers and managers, and acceptance, priority, and support by colleagues and managers). Clinic managers had a central role in the extent to which VHHM services are offered by an individual veterinarian due to their responsibility for staff scheduling, which highly affects the conditions for capacity development, intercollegiate networking, and cooperation. Lack of time was a major barrier for VHHM. On-call duty time and subsequent compensatory leave affected the total time available, and participants described time conflicts between VHHM and emergency services; moreover, it was perceived as challenging to find sufficient time for capacity development in several different species for veterinarians working in mixed practice. The slow development toward more proactive approaches for cattle veterinarians can be explained by the numerous different factors that together constrain the veterinarian to the traditional role of diagnosing and treating sick animals. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
33. High-Precision Branching Ratio Measurement and Spin Assignment Implications for $^{62}$Ga Superallowed $\beta$ Decay
- Author
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MacLean, A. D., Laffoley, A. T., Svensson, C. E., Ball, G. C., Leslie, J. R., Andreoiu, C., Babu, A., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Burbadge, C., Bowry, M., Cheng, C., Cross, D. S., Diaz-Varela, A., Dillmann, I., Dunlop, M. R., Dunlop, R., Evitts, L. J., Finlay, P., Gillespie, S., Garnsworthy, A. B., Garrett, P. E., Gopaul, E., Griffin, C. J., Grinyer, G. F., Hackman, G., Henderson, J., Jigmeddorj, B., Leach, K. G., Kassanda, E., McAfee, J., Moukaddam, M., Natzke, C., Nittala, S., Olaizola, B., Park, J., Paxman, C., Pore, J. L., Porzio, C., Radich, A. J., Ruotsalainen, P., Saito, Y., Sharma, S., Smallcombe, J., Smith, J. K., Sultana, R., Turko, J., Williams, J., Yates, D., and Zidar, T.
- Subjects
Nuclear Experiment - Abstract
A high-precision branching ratio measurement for the superallowed Fermi $\beta^{+}$ emitter $^{62}$Ga was performed with the Gamma-Ray Infrastructure for Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility at TRIUMF. The high efficiency of the GRIFFIN spectrometer allowed 63 $\gamma$-ray transitions, with intensities down to $\approx$1 part per million (ppm) per $^{62}$Ga $\beta^{+}$ decay, to be placed in the level scheme of the daughter nucleus $^{62}$Zn, establishing the superallowed $\beta$ branching ratio for $^{62}$Ga decay to be 99.8577$^{+0.0023}_{-0.0029}\%$, a factor of 4 more precise than the previous world average. For several cascades, $\gamma-\gamma$ angular correlation measurements were performed to assign spins and/or determine the mixing ratios of transitions. In particular, the spin of the 2.342 MeV excited state in the daughter nucleus $^{62}$Zn was definitively assigned as $J = 0$. This assignment resolves a discrepancy between previous measurements and has important implications for the isospin symmetry breaking correction, $\delta_{C1}$, in $^{62}$Ga superallowed Fermi $\beta$ decay., Comment: A text label in Figure 12 has been corrected compared to the original submission
- Published
- 2020
34. Spectroscopic study of $^{47}$Ca from the $\beta^-$ decay of $^{47}$K
- Author
-
Smith, J. K., Garnsworthy, A. B., Pore, J. L., Andreoiu, C., MacLean, A. D., Chester, A., Beadle, Z., Ball, G. C., Bender, P. C., Bildstein, V., Braid, R., Varela, A. Diaz, Dunlop, R., Evitts, L. J., Garrett, P. E., Hackman, G., Ilyushkin, S. V., Jigmeddorj, B., Kuhn, K., Laffoley, A. T., Leach, K. G., Miller, D., Mills, W. J., Moore, W., Moukaddam, M., Olaizola, B., Peters, E. E., Radich, A. J., Rand, E. T., Sarazin, F., Svensson, C. E., Williams, S. J., and Yates, S. W.
- Subjects
Nuclear Experiment - Abstract
The $\beta^-$ decay of $^{47}$K to $^{47}$Ca is an appropriate mechanism for benchmarking interactions spanning the $sd$ and $pf$ shells, but current knowledge of the $\beta^-$-decay scheme is limited. We have performed a high-resolution, high-efficiency study of the $\beta^-$-decay of $^{47}$K with the GRIFFIN spectrometer at TRIUMF-ISAC. The study revealed 48 new transitions, a more precise value for the $^{47}$K half-life (17.38(3)~s), and new spin and parity assignments for eight excited states. Levels placed for the first time here raise the highest state observed in $\beta^-$ decay to within 568(3) keV of the $Q$-value and confirm the previously measured large $\beta^-$-decay branching ratios to the low-lying states. Previously unobserved $\beta^-$-feeding to 3/2$^+$ states between 4.5 and 6.1~MeV excitation energy was identified with a total $\beta^-$-feeding intensity of 1.29(2)\%. The sum of the $B(GT)$ values for these states indicates that the $1s_{1/2}$ proton hole strength near this excitation energy is comparable to the previously known $1s_{1/2}$ proton and neutron hole strengths near 2.6 MeV.
- Published
- 2020
35. Influence of interface state charges on RF performance of LDMOS transistor
- Author
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Kashif, A., Johansson, T., Svensson, C., Azam, S., Arnborg, T., and Wahab, Q.
- Published
- 2008
- Full Text
- View/download PDF
36. Pulse input Class-C power amplifier response of SiC MESFET using physical transistor structure in TCAD
- Author
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Azam, Sher, Svensson, C., and Wahab, Q.
- Published
- 2008
- Full Text
- View/download PDF
37. Coulomb excitation of radioactive 20, 21Na
- Author
-
Schumaker, M. A., Cline, D., Hackman, G., Pearson, C., Svensson, C. E., Wu, C. Y., Andreyev, A., Austin, R. A. E., Ball, G. C., Bandyopadhyay, D., Becker, J. A., Boston, A. J., Boston, H. C., Buchmann, L., Churchman, R., Cifarelli, F., Cooper, R. J., Cross, D. S., Dashdorj, D., Demand, G. A., Dimmock, M. R., Drake, T. E., Finlay, P., Gallant, A. T., Garrett, P. E., Green, K. L., Grint, A. N., Grinyer, G. F., Harkness, L. J., Hayes, A. B., Kanungo, R., Lisetskiy, A. F., Leach, K. G., Lee, G., Maharaj, R., Martin, J-P., Moisan, F., Morton, A. C., Mythili, S., Nelson, L., Newman, O., Nolan, P. J., Orce, J. N., Padilla-Rodal, E., Phillips, A. A., Porter-Peden, M., Ressler, J. J., Roy, R., Ruiz, C., Sarazin, F., Scraggs, D. P., Waddington, J. C., Wan, J. M., Whitbeck, A., Williams, S. J., and Wong, J.
- Published
- 2009
- Full Text
- View/download PDF
38. An inflammatory pathway linked to psychosis in bipolar disorder: RC10
- Author
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Sellgren, C, Kegel, M E, Bergen, S E, Ekman, C J, Olsson, S, Larsson, M, Sullivan, P F, Sklar, P, Purcell, S, Smoller, J W, Magnusson, P KE, Hultman, C M, Walther-Jallow, L, Svensson, C I, Lichtenstein, P, Engberg, G, Erhardt, S, and Landén, M
- Published
- 2014
39. High-precision half-life determination of 14O via direct β counting.
- Author
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Sharma, S., Grinyer, G. F., Ball, G. C., Leslie, J. R., Svensson, C. E., Ali, F. A., Andreoiu, C., Bernier, N., Bhattacharjee, S. S., Bildstein, V., Burbadge, C., Caballero-Folch, R., Coleman, R., Varela, A. Diaz, Dunlop, M. R., Dunlop, R., Garnsworthy, A. B., Fuakye, E. Gyabeng, Huber, G. M., and Jigmeddorj, B.
- Subjects
DEGREES of freedom ,COUNTING - Abstract
The half-life of the superallowed Fermi β + emitter 14 O was determined to high precision via a direct β counting experiment performed at the Isotope Separator and Accelerator (ISAC) facility at TRIUMF. The result, T 1 / 2 ( 14 O) = 70619.2(76) ms, is consistent with, but is more precise than, the world average obtained from 11 previous measurements. Combining the 14 O half-life deduced in the present work with the previous most precise measurements of this quantity leads to a reduction in the overall uncertainty, by nearly a factor of 2. The new world average is T 1 / 2 ( 14 O) = 70619.6(63) ms with a reduced χ 2 value of 0.87 obtained from 8 degrees of freedom. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
40. Branching dendrites with resonant membrane: a “sum-over-trips” approach
- Author
-
Coombes, S., Timofeeva, Y., Svensson, C. -M., Lord, G. J., Josić, K., Cox, S. J., and Colbert, C. M.
- Published
- 2007
- Full Text
- View/download PDF
41. Direct reactions for nuclear structure required for fundamental symmetry tests
- Author
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Garrett P. E., Rand E. T., Diaz Varela A., Ball G. C., Bildstein V., Faestermann T., Hadinia B., Hertenberger R., Jamieson D. S., Jigmeddorj B., Leach K. G., Svensson C. E., and Wirth H.-F.
- Subjects
Physics ,QC1-999 - Abstract
A program of nuclear structure studies to support fundamental symmetry tests has been initiated. Motivated by the search for an electric dipole moment in 199Hg, the structure in the vicinity has been explored via direct reaction studies. To date, these have included the 198,200Hg(d, d′) inelastic scattering reactions, with the aim to obtain information on the E2 and E3 strength distributions, and the 198Hg(d, p) and 200Hg(d, t) reactions to obtain information on the single-particle states in 199Hg. The studies using the 200Hg targets have been fully analyzed using the FRESCO reaction code yielding the E2 and E3 strength distribution to 4 MeV in excitation energy, and the (d, t) single- particle strength to over 3 MeV in excitation energy.
- Published
- 2016
- Full Text
- View/download PDF
42. SPectrometer for Internal Conversion Electrons (SPICE) at TRIUMF-ISAC
- Author
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Smallcombe J., Moukaddam M., Evitts L. J., Garnsworthy A. B., Hallam S., Andreoiu C., Ball G. C., Bolton C., Caballero-Folch R., Constable M., Cross D. S., Garrett P. E., Hackman G., Henderson J., Henderson R., Ketelhut S., Kruecken R., Kurchaninov L., Park J., Pore J. L., Rand E. T., Ruotsalainen P., Smith J. K., Svensson C. E., and Williams M.
- Subjects
Physics ,QC1-999 - Abstract
A new ancillary detector, SPICE (SPectrometer for Internal Conversion Electrons) has been constructed and recently commissioned for use with radioactive ion beams at the TRIUMF-ISAC II facility. SPICE is designed to be operated in conjunction with the TIGRESS High-Purity Germanium (HPGe) spectrometer to perform combined in-beam γ-ray and internal-conversion-electron spectroscopy. The main feature of SPICE is high effciency over a wide range of electron energies from 100 to 3500 keV, with an effective reduction of beam-induced backgrounds. SPICE will be a powerful tool to measure conversion coeffcients and E0 transitions in atomic nuclei. A recent in-beam commissioning experiment demonstrates the effectiveness of the basic design concept of SPICE in background suppression.
- Published
- 2016
- Full Text
- View/download PDF
43. Conversion electrons from high-statistics β-decay measurements with the 8π spectrometer at TRIUMF-ISAC
- Author
-
Garrett P. E., Jigmeddorj B., Radich A. J., Andreoiu C., Ball G. C., Bangay J. C., Bianco L., Bildstein V., Chagnon-Lessard S., Cross D. S., Demand G. A., Diaz Varela A., Dunlop R., Finlay P., Garnsworthy A. B., Green K. L., Hackman G., Hadinia B., Leach K. G., Michetti-Wilson J., Orce J. N., Rajabali M. M., Rand E. T., Starosta K., Sumithrarachchi C., Svensson C. E., Triambak S., Wang Z. M., Williams S. J., Wood J. L., Wong J., Yates S. W., and Zganjar E. F.
- Subjects
Physics ,QC1-999 - Abstract
The 8π spectrometer, located at TRIUMF-ISAC, was the world’s most powerful spectrometer dedicated to β-decay studies until its decommissioning in early 2014 for replacement with the GRIFFIN array. An integral part of the 8π spectrometer was the Pentagonal Array for Conversion Electron Spectroscopy (PACES) consisting of 5 Si(Li) detectors used for charged-particle detection. PACES enabled both γ − e− and e− − e− coincidence measurements, which were crucial for increasing the sensitivity for discrete e− lines in the presence of large backgrounds. Examples from a 124Cs decay experiment, where the data were vital for the expansion of the 124Cs decay scheme, are shown. With suffcient statistics, measurements of conversion coeffcients can be used to extract the E0 components of Jπ → Jπ transitions for J ≠ 0, which is demonstrated for data obtained in 110In→110Cd decay. With knowledge of the shapes of the states involved, as obtained, for example, from the use of Kumar-Cline shape invariants, the mixing of the states can be extracted.
- Published
- 2016
- Full Text
- View/download PDF
44. Collective 2p-2h intruder states in $^{118}$Sn studied via $\beta$-decay of $^{118}$In using GRIFFIN
- Author
-
Ortner, K., Andreoiu, C., Spieker, M., Ball, G. C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D. S., Dunlop, M. R., Dunlop, R., Garcia, F. H., Garnsworthy, A. B., Garrett, P. E., Henderson, J., Measures, J., Olaizola, B., Park, J., Petrache, C. M., Pore, J. L., Raymond, K., Smith, J. K., Southall, D., Svensson, C. E., Ticu, M., Turko, J., Whitmore, K., and Zidar, T.
- Subjects
Nuclear Experiment - Abstract
The low-lying structure of semi-magic $^{118}$Sn has been investigated through the $\beta$-decay of $^{118}$In ($T_{1/2}=4.45$ min) to study shape coexistence via the reduced transition probabilities of states in the 2p-2h proton intruder band. This high-statistics study was carried out at TRIUMF-ISAC with the GRIFFIN spectrometer. In total, 99 transitions have been placed in the level scheme with 43 being newly observed. Three low-lying $\gamma$-ray transitions with energies near 285 keV have been resolved from which the 2$^+_{\mathrm{intr.}} \rightarrow 0^+_{\mathrm{intr.}}$ 284.52-keV transition was determined to have half of the previous branching fraction leading to a $B(E2;2^+_2\rightarrow 0^+_2)$ of 21(4) W.u. compared to 39(7) W.u. from the previous measurement. Calculations using $sd$ IBM-2 with mixing have also been made to compare the experimental $B(E2)$ values to the theoretical values and to make comparisons to the $^{114,116}$Sn isotopes previously studied using the same theoretical model.
- Published
- 2020
45. Onset of high-spin rotational bands in the N=Z nucleus 62Ga
- Author
-
Rudolph, D., Ragnarsson, I., Åberg, S., Andreoiu, C., Carpenter, M. P., Clark, R. M., Ekman, J., Fahlander, C., Janssens, R. V. F., Kondev, F G, Lauritsen, T, Sarantites, D. G., Seweryniak, D., and Svensson, C. E.
- Subjects
N=Z nuclei ,gamma-ray spectroscopy ,Nuclear Theory ,Subatomic Physics ,Nuclear Experiment ,nuclear structure and decays - Abstract
The fusion-evaporation reaction 28Si + 40Ca at 122 MeV beam energy was used to populate high-spin states in the odd-odd N = Z nucleus 62Ga. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array the decay scheme of 62Ga was extended beyond 10 MeV excitation energy. The onset of band structures was observed. These high-spin rotational states are interpreted and classified by means of cranked Nilsson-Strutinsky calculations.
- Published
- 2020
46. Coulomb excitation of the $\left|T_z\right|=\frac{1}{2}$, $A=23$ mirror pair
- Author
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Henderson, J., Hackman, G., Ruotsalainen, P., Holt, J. D., Stroberg, S. R., Andreoiu, C., Ball, G. C., Bernier, N., Bowry, M., Caballero-Folch, R., Cruz, S., Varela, A. Diaz, Evitts, L. J., Frederick, R., Garnsworthy, A. B., Holl, M., Lassen, J., Measures, J., Olaizola, B., O'Sullivan, E., Paetkau, O., Park, J., Smallcombe, J., Svensson, C. E., Whitmore, K., and Wu, C. Y.
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
Background: Electric-quadrupole ($E2$) strengths relate to the underlying quadrupole deformation of a nucleus and present a challenge for many nuclear theories. Mirror nuclei in the vicinity of the line of $N=Z$ represent a convenient laboratory for testing deficiencies in such models, making use of the isospin-symmetry of the systems. Purpose: Uncertainties associated with literature $E2$ strengths in \textsuperscript{23}Mg are some of the largest in $T_z=\left|\frac{1}{2}\right|$ nuclei in the $sd$-shell. The purpose of the present work is to improve the precision with which these values are known, to enable better comparison with theoretical models. Methods: Coulomb-excitation measurements of $^{23}$Mg and $^{23}$Na were performed at the TRIUMF-ISAC facility using the TIGRESS spectrometer. They were used to determine the $E2$ matrix elements of mixed $E2$/$M1$ transitions. Results: Reduced $E2$ transition strengths, $B(E2)$, were extracted for \textsuperscript{23}Mg and \textsuperscript{23}Na. Their precision was improved by factors of approximately six for both isotopes, while agreeing within uncertainties with previous measurements. Conclusions: A comparison was made with both shell-model and {\it ab initio} valence-space in-medium similarity renormalization group calculations. Valence-space in-medium similarity-renormalization-group calculations were found to underpredict the absolute $E2$ strength - in agreement with previous studies.
- Published
- 2020
47. Onset of high-spin rotational bands in the N = Z nucleus Ga-62
- Author
-
Rudolph, D., Ragnarsson, I, Åberg, S., Andreoiu, C., Carpenter, M. P., Clark, R. M., Ekman, Jörgen, Fahlander, C., Janssens, R. V. F., Kondev, F. G., Lauritsen, T., Sarantites, D. G., Seweryniak, D., and Svensson, C. E.
- Subjects
Subatomär fysik ,Nuclear Theory ,Subatomic Physics ,Nuclear Experiment - Abstract
The fusion-evaporation reaction Si-28 + Ca-40 at 122 MeV beam energy was used to populate high-spin states in the odd-odd N = Z nucleus Ga-62. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array the decay scheme of Ga-62 was extended beyond 10 MeV excitation energy. The onset of band structures was observed. These high-spin rotational states are interpreted and classified by means of cranked Nilsson-Strutinsky calculations.
- Published
- 2020
48. Absence of Low-Energy Shape Coexistence in $^{80}\mathrm{Ge}$: The Nonobservation of a Proposed Excited ${0}_{2}^{+}$ Level at 639 keV
- Author
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Garcia, F. H., Andreoiu, C., Ball, G. C., Bell, A., Garnsworthy, A. B., Nowacki, F., Petrache, C. M., Poves, A., Whitmore, K., Ali, F. A., Bernier, N., Bhattacharjee, S. S., Bowry, M., Coleman, R. J., Dillmann, I., Djianto, I., Forney, A. M., Gascoine, M., Hackman, G., Leach, K. G., Murphy, A. N., Natzke, C. R., Olaizola, B., Ortner, K., Peters, E. E., Rajabali, M. M., Raymond, K., Svensson, C. E., Umashankar, R., Williams, J., Yates, D., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,Nuclear Physics - Abstract
The $^{80}$Ge structure was investigated in a high-statistics $\beta$-decay experiment of $^{80}$Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through $\gamma$, $\beta$-$e$, $e$-$\gamma$ and $\gamma$-$\gamma$ spectroscopy. No evidence was found for the recently reported 0$_2^{+}$ 639-keV level suggested as evidence for low-energy shape coexistence in $^{80}$Ge. Large-scale shell model calculations performed in $^{78,80,82}$Ge place the $0^{+}_{2}$ level in $^{80}$Ge at 2\,MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in $^{80}$Ge.
- Published
- 2020
49. Gamma-ray spectroscopy of the doubly magic nucleus 56Ni
- Author
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Johansson, E. K., Rudolph, D., Ekman, J., Fahlander, C., Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Fallon, P., Janssens, R. V. F., Kondev, F. G., Khoo, T. L., Lauritsen, T., Macchiavelli, A. O., Reviol, W., Sarantites, D. G., Seweryniak, D., Svensson, C. E., and Williams, S. J.
- Published
- 2006
- Full Text
- View/download PDF
50. Detailed spectroscopy of $^{46}$Ca: A study of the $\beta^-$ decay of $^{46}$K
- Author
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Pore, J. L., Andreoiu, C., Smith, J. K., MacLean, A. D., Chester, A., Holt, J. D., Ball, G. C., Bender, P. C., Bildstein, V., Braid, R., Varela, A. Diaz, Dunlop, R., Evitts, L. J., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Ilyushkin, S. V., Jigmeddorj, B., Kuhn, K., Kunz, P., Laffoley, A. T., Leach, K. G., Miller, D., Mills, W. J., Moore, W., Moukaddam, M., Morrison, L. N., Olaizola, B., Peters, E. E., Radich, A. J., Rand, E. T., Sarazin, F., Southall, D., Svensson, C. E., Williams, S. J., and Yates, S. W.
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Experiment - Abstract
We report on high-statistics data from the $\beta^-$ decay of the $^{46}$K $J^{\pi}$ = 2$^-$ ground state taken with the GRIFFIN spectrometer located at the TRIUMF-ISAC facility. In total, 199 $\gamma$ rays and 42 excited states were placed in the level scheme, and from the observed $\beta$ feeding and angular correlations of pairs of cascading $\gamma$ rays, it was possible to assign spins and parities to excited states and determine mixing ratios for selected $\gamma$ rays. The level structure of $^{46}$Ca is compared to theoretical predictions from a microscopic valence-space Hamiltonian derived from two- (NN) and three-nucleon (3N) forces. These calculations are in reasonable agreement with the experimental data and indicate that the protons in this region are not as inert as would be expected for semi-magic nuclei.
- Published
- 2019
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