44 results on '"Svensson, C.E."'
Search Results
2. 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., Krücken, 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.
- Published
- 2019
- Full Text
- View/download PDF
3. In-beam internal conversion electron spectroscopy with the SPICE detector
- Author
-
Moukaddam, M., Smallcombe, J., Evitts, L.J., Garnsworthy, A.B., Andreoiu, C., Ball, G.C., Berean-Dutcher, J., Bishop, D., Bolton, C., Caballero-Folch, R., Constable, M., Cross, D.S., Drake, T.E., Dunlop, R., Garrett, P.E., Georges, S., Hackman, G., Hallam, S., Henderson, J., Henderson, R., Krücken, R., Kurchaninov, L., Kurkjian, A., Olaizola, B., O’Sullivan, E., Lu, P., Park, J., Peters, E.E., Pore, J.L., Rand, E.T., Ruotsalainen, P., Smith, J.K., Southall, D., Spencer, M., Svensson, C.E., Wiens, M., Williams, M., Yates, S.W., and Zidar, T.
- Published
- 2018
- Full Text
- View/download PDF
4. Recoil distance method lifetime measurements at TRIUMF-ISAC using the TIGRESS Integrated Plunger
- Author
-
Chester, A., Ball, G.C., Bernier, N., Cross, D.S., Domingo, T., Drake, T.E., Evitts, L.J., Garcia, F.H., Garnsworthy, A.B., Hackman, G., Hallam, S., Henderson, J., Henderson, R., Krücken, R., MacConnachie, E., Moukaddam, M., Padilla-Rodal, E., Paetkau, O., Pore, J.L., Rizwan, U., Ruotsalainen, P., Shoults, J., Smallcombe, J., Smith, J.K., Starosta, K., Svensson, C.E., Van Wieren, K., Williams, J., and Williams, M.
- Published
- 2018
- Full Text
- View/download PDF
5. Implementation of the Doppler shift attenuation method using TIP/TIGRESS at TRIUMF: Fusion-evaporation lifetime measurements in 22Ne
- Author
-
Williams, J., Andreoiu, C., Ashley, R., Ball, G.C., Ballast, T., Bender, P.C., Bolton, C., Bildstein, V., Chester, A., Cross, D.S., Domingo, T., Drake, T., Garnsworthy, A., Garrett, P., Hadinia, B., Hackman, G., Henderson, R., Jamieson, D., Jigmeddorj, B., Knapton, A., Kruecken, R., Miller, D., Mills, W.J., Moukaddam, M., Rajabali, M., Rizwan, U., Starosta, K., Svensson, C.E., Unsworth, C., Varela, A.D., Voss, P., Wang, Z.M., and Wong, J.
- Published
- 2017
- Full Text
- View/download PDF
6. The GRIFFIN data acquisition system
- Author
-
Garnsworthy, A.B., Pearson, C.J., Bishop, D., Shaw, B., Smith, J.K., Bowry, M., Bildstein, V., Hackman, G., Garrett, P.E., Linn, Y., Martin, J.-P., Mills, W.J., and Svensson, C.E.
- Published
- 2017
- Full Text
- View/download PDF
7. 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
- Full Text
- View/download PDF
8. Characteristics of GRIFFIN high-purity germanium clover detectors
- Author
-
Rizwan, U., Garnsworthy, A.B., Andreoiu, C., Ball, G.C., Chester, A., Domingo, T., Dunlop, R., Hackman, G., Rand, E.T., Smith, J.K., Starosta, K., Svensson, C.E., Voss, P., and Williams, J.
- Published
- 2016
- Full Text
- View/download PDF
9. First Report of a Doublet 2209-keV State in \(^{100}\)Zr
- Author
-
Kalaydjieva, D., primary, Garrett, P.E., additional, Bidaman, H., additional, Rocchini, M., additional, Zielińska, M., additional, Korten, W., additional, Bildstein, V., additional, Pannu, S., additional, Ahmed, Z., additional, Andreoiu, C., additional, Annen, D., additional, Ball, G.C., additional, Benzoni, G., additional, Bhattacharjee, S.S., additional, Buck, S., additional, Coleman, R.J., additional, Devinyak, S., additional, Dillmann, I., additional, Caballero-Folch, R., additional, Garcia, F.H., additional, Garnsworthy, A.B., additional, Greaves, B., additional, Griffin, C.J., additional, Grinyer, G.F., additional, Gyabeng Fuakye, E., additional, Hackman, G., additional, Hymers, D., additional, Kanungo, R., additional, Kapoor, K., additional, Kasanda, E., additional, Marchini, N., additional, Mashtakov, K.M., additional, Nannini, A., additional, Natzke, C., additional, Olaizola, B., additional, Ortner, K., additional, Petrache, C.M., additional, Polettini, M., additional, Radich, A.J., additional, Saei, N., additional, Satrazani, M., additional, Siciliano, M., additional, Singh, M., additional, Spagnoletti, P., additional, Svensson, C.E., additional, Torres, D.A., additional, Umashankar, R., additional, Vedia, V., additional, and Zidar, T., additional
- Published
- 2023
- Full Text
- View/download PDF
10. Digital Rise-Time Discrimination of Pulses from the Tigress Integrated Plunger Silicon PIN Diode Wall
- Author
-
Voss, P., Henderson, R., Andreoiu, C., Ashley, R., Ball, G.C., Bender, P.C., Chester, A., Cross, D.S., Drake, T.E., Garnsworthy, A.B., Hackman, G., Ketelhut, S., Krücken, R., Miller, D., Rajabali, M.M., Starosta, K., Svensson, C.E., Tardiff, E., Unsworth, C., and Wang, Z.-M.
- Published
- 2015
- Full Text
- View/download PDF
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
- Full Text
- View/download PDF
12. Single neutron transfer on Ne and its relevance for the pathway of nucleosynthesis in astrophysical X-ray bursts
- Author
-
Lotay, G., Henderson, J., Catford, W.N., Ali, F.A., Berean, J., Bernier, N., Bhattacharjee, S.S., Bowry, M., Caballero-Folch, R., Davids, B., Drake, T.E., Garnsworthy, A.B., Ghazi Moradi, F., Gillespie, S.A., Greaves, B., Hackman, G., Hallam, S., Hymers, D., Kasanda, E., Levy, D., Luna, B.K., Mathews, A., Meisel, Z., Moukaddam, M., Muecher, D., Olaizola, B., Orr, N.A., Patel, H.P., Rajabali, M.M., Saito, Y., Smallcombe, J., Spencer, M., Svensson, C.E., Whitmore, K., and Williams, M.
- Abstract
We present new experimental measurements of resonance strengths in the astrophysical $^{23}$Al(p,γ)$^{24}$Si reaction, constraining the pathway of nucleosynthesis beyond $^{22}$Mg in X-ray burster scenarios. Specifically, we have performed the first measurement of the (d,p) reaction using a radioactive beam of $^{23}$Ne to explore levels in $^{24}$Ne, the mirror analog of $^{24}$Si. Four strong single-particle states were observed and corresponding neutron spectroscopic factors were extracted with a precision of ∼20%. Using these spectroscopic factors, together with mirror state identifications, we have reduced uncertainties in the strength of the key ℓ = 0 resonance at Er = 157 keV, in the astrophysical $^{23}$Al(p,γ) reaction, by a factor of 4. Our results show that the $^{22}$Mg(p,γ)$^{23}$Al(p,γ) pathway dominates over the competing $^{22}$Mg(α,p) reaction in all but the most energetic X-ray burster events (T>0.85 GK), significantly affecting energy production and the preservation of hydrogen fuel.
- Published
- 2022
13. Single neutron transfer on 23Ne and its relevance for the pathway of nucleosynthesis in astrophysical X-ray bursts
- Author
-
Lotay, G., primary, Henderson, J., additional, Catford, W.N., additional, Ali, F.A., additional, Berean, J., additional, Bernier, N., additional, Bhattacharjee, S.S., additional, Bowry, M., additional, Caballero-Folch, R., additional, Davids, B., additional, Drake, T.E., additional, Garnsworthy, A.B., additional, Ghazi Moradi, F., additional, Gillespie, S.A., additional, Greaves, B., additional, Hackman, G., additional, Hallam, S., additional, Hymers, D., additional, Kasanda, E., additional, Levy, D., additional, Luna, B.K., additional, Mathews, A., additional, Meisel, Z., additional, Moukaddam, M., additional, Muecher, D., additional, Olaizola, B., additional, Orr, N.A., additional, Patel, H.P., additional, Rajabali, M.M., additional, Saito, Y., additional, Smallcombe, J., additional, Spencer, M., additional, Svensson, C.E., additional, Whitmore, K., additional, and Williams, M., additional
- Published
- 2022
- Full Text
- View/download PDF
14. Improved measurement of the <math><mrow><msub><mn>0</mn><mn>2</mn></msub><msup><mrow/><mo>+</mo></msup><mo>→</mo><msub><mn>0</mn><mn>1</mn></msub><msup><mrow/><mo>+</mo></msup><mspace width='0.28em'/><mi>E</mi><mn>0</mn></mrow></math> transition strength for <math><mmultiscripts><mi>Se</mi><mprescripts/><none/><mn>72</mn></mmultiscripts></math> using the SPICE spectrometer
- Author
-
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., Williams, J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; 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.
- Published
- 2022
15. Investigation of excited 0+ states in 160Er populated via the (p, t) two-neutron transfer reaction
- Author
-
Burbadge C., Garrett P.E., Ball G.C., Bildstein V., Diaz Varela A., Dunlop M.R., Dunlop R., Faesternann T., Hertenberger R., Jamieson D.S., Kisliuk D., Leach K.G., Loranger J., MacLean A.D., Radich A.J., Rand E.T., Svensson C.E., Triambak S., and Wirth H.-F.
- Subjects
Physics ,QC1-999 - Abstract
Many efforts have been made in nuclear structure physics to interpret the nature of low-lying excited 0+ states in well-deformed rare-earth nuclei. However, one of the difficulties in resolving the nature of these states is that there is a paucity of data. In this work, excited 0+ states in the N = 92 nucleus 160Er were studied via the 162Er(p, t)160Er two-neutron transfer reaction, which is ideal for probing 0+ → 0+ transitions, at the Maier-Leibnitz-Laboratorium in Garching, Germany. Reaction products were momentum-analyzed with a Quadrupole-3-Dipole magnetic spectrograph. The 0+2 state was observed to be strongly populated with 18% of the ground state strength.
- Published
- 2018
- Full Text
- View/download PDF
16. Advances at TRIUMF-ISAC and decay of neutron-rich Cd studied with GRIFFIN
- Author
-
Garrett P.E., Bernier N., Dunlop R., MacLean A.D., Bildstein V., Dillmann I., Jungclaus A., Svensson C.E., Andreoiu C., Ball G.C., Bidaman H., Boubel P., Burbadge C., Caballero-Folch R., Dunlop M.R., Evitts L.J., Garcia F., Garnsworthy A.B., Hackman G., Hallam S., Henderson J., Ilyushkin S., Kisliuk D., Krücken R., Lassen J., Li R., MacConnachie E., McGee E., Moukaddam M., Olaizola B., Ortner K., Padilla-Rodal E., Park J., Paetkau O., Petrache C.M., Pore J.L., Radich A.J., Ruotsalainen P., Smallcombe J., Smith J.K., Tabor S.L., Teigelhöfer A., Turko J., Whitmore K., and Zidar T.
- Subjects
Physics ,QC1-999 - Abstract
The β-decay half lives of nuclei near the r-process path are critical information required for abundance calculations, especially those near neutron number N = 82. Specifically, the nuclei below doubly-magic 132Sn are key, and play an important role in the formation and shape of the second r-process abundance peak. The half lives in this region are challenging to measure due to the significant β-delayed neutron decay branches and the population of isomeric states with half lives comparable to the ground states. However, by measuring the time distribution of γ rays, these complications can be eliminated. This requires, however, a very effcient γ-ray spectrometer since the production of isotopes in this region is very limited. The new GRIFFIN array at TRIUMF-ISAC provides the high effciency required for these measurements. Recent improvements in the quality of the beams produced at TRIUMF, employing the IG-LIS device, are outlined, as well as the current status of the ARIEL facility. The GRIFFIN spectrometer and its use are briefly described. The experiment to measure the half lives of 128-130Cd is outlined and the results given, and some examples of the power of GRIFFIN to expand decay schemes, specifically for the decay of 128Cd to 128In, are given.
- Published
- 2018
- Full Text
- View/download PDF
17. Scattering of halo nuclei on heavy targets at energies around the Coulomb barrier: The case of 11Be on 197Au
- Author
-
Pesudo V., Borge M.J.G., Moro A.M., Lay J.A., Nácher E., Gómez-Camacho J., Tengblad O., Acosta L., Alcorta M., Alvarez M.A.G., Andreoiu C., Bender P.C., Braid R., Cubero M., Di Pietro A., Fernández-García J.P., Figuera P., Fisichella M., Fulton B.R., Garnsworthy A.B., Hackman G., Hager U., Kirsebom O.S., Kuhn K., Lattuada M., Marquínez-Durán G., Martel I., Miller D., Moukaddam M., O'Malley P.D., Perea A., Rajabali M.M., Sánchez-Benítez A.M., Sarazin F., Scuderi V., Svensson C.E., Unsworth C., and Wang Z.M.
- Subjects
Physics ,QC1-999 - Abstract
This work reports on the scattering of 11Be on 197Au at energies around and below the Coulomb barrier. By experimentally identifying the elastic scattering, inelastic scattering and breakup channels, and comparing them with different calculations, valuable information on the 11Be structure and its B(E1) distribution to the continuum are obtained. On top of that, a deeper understanding of the scattering process at low energies is achieved for reactions of this kind, making these studies extendable to other loosely-bound systems like 17,19C
- Published
- 2017
- Full Text
- View/download PDF
18. Spectroscopic studies of neutron-rich $^{129}$In and its $\beta$-decay daughter, $^{129}$Sn, using the GRIFFIN spectrometer
- Author
-
Garcia, F.H., Andreoiu, C., Ball, G.C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D.S., Dunlop, M.R., Dunlop, R., Garnsworthy, A.B., Garrett, P.E., Henderson, J., Measures, J., Olaizola, B., Ortner, K., Park, J., Petrache, C.M., Pore, J.L., Raymond, K., Smith, J.K., Southall, D., Svensson, C.E., Ticu, M., Turko, J., Whitmore, K., Zidar, T., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and GRIFFIN
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure ,Nuclear Experiment - Abstract
The $\beta$-decay of neutron-rich $^{129}$In into $^{129}$Sn was studied using the GRIFFIN spectrometer at the ISAC facility at TRIUMF. The study observed the half-lives of the ground state and each of the $\beta$-decaying isomers. The level scheme of $^{129}$Sn has been expanded with thirty-one new $\gamma$-ray transitions and nine new excited levels, leading to a re-evaluation of the $\beta$-branching ratios and level spin assignments. The observation of the $\beta$-decay of the (29/2$^{+}$) 1911-keV isomeric state in $^{129}$In is reported for the first time, with a branching ratio of 2.0(5)$\%$.
- Published
- 2021
19. 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
- Full Text
- View/download PDF
20. Decay spectroscopy of Cd 129
- Author
-
Saito, Y., Dillmann, I., Krücken, R., Bernier, N., Ball, G.C., Bowry, M., Andreoiu, C., Bidaman, H., Bildstein, V., Boubel, P., Burbadge, C., Caballero-Folch, R., Dunlop, M.R., Evitts, L.J., Garcia, F.H., Garnsworthy, A.B., Garrett, P.E., Grawe, H., Hackman, G., Hallam, S., Henderson, J., Ilyushkin, S., Jungclaus, Andrea, Kisliuk, D., Lassen, J., Li, R., Macconnachie, E., Maclean, A.D., McGee, E., Moukaddam, M., Olaizola, B., Padilla-Rodal, E., Park, J., Paetkau, O., Petrache, C.M., Pore, J.L., Radich, A.J., Ruotsalainen, P., Smallcombe, J., Smith, J.K., Svensson, C.E., Teigelhöfer, A., Turko, J., Natural Sciences and Engineering Research Council of Canada, Ministerio de Economía y Competitividad (España), National Science Foundation (US), Universidad Nacional Autónoma de México, Canada Foundation for Innovation, University of Guelph, and National Research Council of Canada
- Subjects
Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Analytical chemistry ,010306 general physics ,Spectroscopy ,01 natural sciences ,3. Good health - Abstract
13 pags., 9 figs., 2 tabs., Excited states of In129 populated following the β decay of Cd129 were experimentally studied with the GRIFFIN spectrometer at the ISAC facility of TRIUMF, Canada. A 480-MeV proton beam was impinged on a uranium carbide target and Cd129 was extracted using the Ion Guide Laser Ion Source (IG-LIS). β and γ rays following the decay of Cd129 were detected with the GRIFFIN spectrometer comprising the plastic scintillator SCEPTAR and 16 high-purity germanium (HPGe) clover-type detectors. From the β-γ-γ coincidence analysis, 32 new transitions and seven new excited states were established, expanding the previously known level scheme of In129. The logft values deduced from the β-feeding intensities suggest that some of the high-lying states were populated by the ν0g7/2→π0g9/2 allowed Gamow-Teller (GT) transition, which indicates that the allowed GT transition is more dominant in the Cd129 decay than previously reported. Observation of fragmented Gamow-Teller strengths is consistent with theoretical calculations., The authors would like to thank the operators at the TRIUMF-ISAC facility for providing the radioactive beam. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Research Chairs Program, NSERC Discovery Grants No. SAPIN-2014-00028 and No. RGPAS 462257-2014, the NSERC CREATE Program IsoSiM (Isotopes for Science and Medicine), the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P, the US National Science Foundation (NSF) under Contract No. NSF14-01574, and the Mexican DGAPA-UNAM program under Contract No. PAPIIT-IN110418. The GRIFFIN spectrometer was funded by the Canada Foundation for Innovation (CFI), TRIUMF, and the University of Guelph. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada (NRC). Y.S. would like to thank Jorge Agramunt (IFIC Valencia, Spain) for providing a program for fitting the time distribution of β particles.The authors would like to thank the operators at the TRIUMF-ISAC facility for providing the radioactive beam. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Research Chairs Program, NSERC Discovery Grants No. SAPIN-2014-00028 and No. RGPAS 462257-2014, the NSERC CREATE Program IsoSiM (Isotopes for Science and Medicine), the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P, the US National Science Foundation (NSF) under Contract No. NSF14-01574, and the Mexican DGAPA-UNAM program under Contract No. PAPIIT-IN110418. The GRIFFIN spectrometer was funded by the Canada Foundation for Innovation (CFI), TRIUMF, and the University of Guelph. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada (NRC). Y.S. would like to thank Jorge Agramunt (IFIC Valencia, Spain) for providing a program for fitting the time distribution of β particles.
- Published
- 2020
21. Decay Spectroscopy of $^{129}$Cd
- Author
-
Saito, Y., Dillmann, I., Krücken, R., Bernier, N., Ball, G.C., Bowry, M., Andreoiu, C., Bidaman, H., Bildstein, V., Boubel, P., Burbadge, C., Caballero-Folch, R., Dunlop, M.R., Dunlop, R., Evitts, L.J., Garcia, F.H., Garnsworthy, A.B., Garrett, P.E., Grawe, H., Hackman, G., Hallam, S., Henderson, J., Ilyushkin, S., Jungclaus, A., Kisliuk, D., Lassen, J., Li, R., Macconnachie, E., MacLean, A.D., Mcgee, E., Moukaddam, M., Olaizola, B., Padilla-Rodal, E., Park, J., Paetkau, O., Petrache, C.M., Pore, J.L., Radich, A.J., Ruotsalainen, P., Smallcombe, J., Smith, J.K., Svensson, C.E., Teigelhöfer, A., Turko, J., Zidar, T., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Nuclear Theory (nucl-th) ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,Nuclear Theory ,FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure ,Nuclear Experiment - Abstract
Excited states of $^{129}$In populated following the $\beta$-decay of $^{129}$Cd were experimentally studied with the GRIFFIN spectrometer at the ISAC facility of TRIUMF, Canada. A 480-MeV proton beam was impinged on a uranium carbide target and $^{129}$Cd was extracted using the Ion Guide Laser Ion Source (IG-LIS). $\beta$- and $\gamma$-rays following the decay of $^{129}$Cd were detected with the GRIFFIN spectrometer comprising the plastic scintillator SCEPTAR and 16 high-purity germanium (HPGe) clover-type detectors. %, along with the $\beta$-particles were detected with SCEPTAR. From the $\beta$-$\gamma$-$\gamma$ coincidence analysis, 32 new transitions and 7 new excited states were established, expanding the previously known level scheme of $^{129}$In. The $\log ft$ values deduced from the $\beta$-feeding intensities suggest that some of the high-lying states were populated by the $\nu 0 g_{7/2} \rightarrow \pi 0 g_{9/2}$ allowed Gamow-Teller (GT) transition, which indicates that the allowed GT transition is more dominant in the $^{129}$Cd decay than previously reported. Observation of fragmented Gamow-Teller strengths is consistent with theoretical calculations., Comment: 13 pages, 9 figures, to be published in Physical Review C
- Published
- 2020
22. $\beta$ Decay of $^{132}$In and Spectroscopy of $^{132}$Sn and $^{131}$Sb with the GRIFFIN Spectrometer
- Author
-
Whitmore, K., Andreoiu, C., Garcia, F.H., Ortner, K., Holt, J.D., Miyagi, T., Ball, G.C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D.S., Dunlop, M.R., Dunlop, R., Garnsworthy, A.B., Garrett, P.E., Henderson, J., Measures, J., Olaizola, B., Park, J., Petrache, C.M., Pore, J.L., Smith, J.K., Southall, D., Svensson, C.E., Ticu, M., Turko, J., Zidar, T., 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure ,Nuclear Experiment - Abstract
Spectroscopy of doubly magic $^{132}_{50}$Sn$_{82}$ has been performed with the GRIFFIN spectrometer at TRIUMF-ISAC following the $\beta$ decay of $^{132}_{49}$In$_{83}$. The analysis has allowed for the placement of a total of 70 transitions and 29 excited states in $^{132}$Sn. Detailed spectroscopy has also been performed on $^{131}$Sb, resulting from the $\beta$ decay of $^{131}$Sn, produced from the $\beta$-delayed neutron decay of $^{132}$In. Measurement of $\gamma$-rays in both $^{131}$Sn and $^{131}$Sb has led to the determination of the $\beta$-delayed neutron emission probability, $P_{n}$, from $^{132}$In. This is the first time the $P_{n}$ has been measured for this nucleus using $\gamma$ spectroscopy, and the new value of 12.3(4)% is consistent with the most recent $\beta-n$ counting experiment. Additionally, $\gamma$-$\gamma$ angular correlations have been performed in $^{132}$Sn, supporting the spin assignments of several excited states. Novel ab initio calculations are presented which describe several of the excited states, and these are compared to the experimental spectrum., Comment: 14 pages, 7 figures, to be published in Physical Review C
- Published
- 2020
23. Onset of high-spin rotational bands in the N=Z nucleus Ga 62
- Author
-
Åberg, S., Svensson, C.E., Carpenter, M.P., Sarantites, D.G., Janssens, R.V.F., Andreoiu, C., Ragnarsson, I., Seweryniak, D., Ekman, J., Fahlander, C., Lauritsen, T., Rudolph, D., Kondev, F.G., and Clark, R.M.
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
The fusion-evaporation reaction Si28+Ca40 at 122 MeV beam energy was used to populate high-spin states in the odd-odd N=Z nucleus Ga62. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array the decay scheme of Ga62 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
24. Multiple Shape Coexistence in 110,112Cd and Beyond Mean Field Calculations
- Author
-
Garrett, P.E., primary, Rodríguez, T.R., additional, Varela, A. Diaz, additional, Green, K.L., additional, Bangay, J., additional, Finlay, A., additional, Austin, R.A.E., additional, Ball, G.C., additional, Bandyopadhyay, D.S., additional, Bildstein, V., additional, Colosimo, S., additional, Cross, D.S., additional, Demand, G.A., additional, Finlay, P., additional, Garnsworthy, A.B., additional, Grinyer, G.F., additional, Hackman, G., additional, Jigmeddorj, B., additional, Jolie, J., additional, Kulp, W.D., additional, Leach, K.G., additional, Morten, A.C., additional, Orce, J.N., additional, Person, C.J., additional, Phillips, A.A., additional, Radich, A.J., additional, Rand, E.T., additional, Schumaker, M.A., additional, Svensson, C.E., additional, Sumithrarachchi, C., additional, Triambak, S., additional, Warr, N., additional, Wong, J., additional, Wood, J.L., additional, and Yates, S.W., additional
- Published
- 2020
- Full Text
- View/download PDF
25. DESCANT and β-delayed neutron measurements at TRIUMF
- Author
-
Bildstein V., Garrett P.E., Ashley S.F., Ball G.C., Bianco L., Bandyopadhyay D., Bangay J., Crider B.P., Demand G., Deng G., Dillmann I., Finlay A., Garnsworthy A.B., Hackman G., Hadinia B., Krücken R., Leach K.G., Martin J-P., McEllistrem M.T., Pearson C.J., Peters E.E., Prados-Estévez F.M., Radich A., Sarazin F., Sumithrarachchi C., Svensson C.E., Vanhoy J.R., Wong J., and Yates S.W.
- Subjects
Physics ,QC1-999 - Abstract
The DESCANT array (Deuterated Scintillator Array for Neutron Tagging) consists of up to 70 detectors, each filled with approximately 2 liters of deuterated benzene. This scintillator material o_ers pulse-shape discrimination (PSD) capabilities to distinguish between neutrons and γ-rays interacting with the scintillator material. In addition, the anisotropic nature of n – d scattering allows for the determination of the neutron energy spectrum directly from the pulse height spectrum, complementing the traditional time-of-flight (ToF) information. DESCANT can be coupled either to the TIGRESS (TRIUMF-ISAC Gamma-Ray Escape Suppressed Spectrometer) γ-ray spectrometer [1] located in the ISAC-II [2] hall of TRIUMF for in-beam experiments, or to the GRIFFIN (Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei) γ-ray spectrometer [3] located in the ISAC-I hall of TRIUMF for decay spectroscopy experiments.
- Published
- 2015
- Full Text
- View/download PDF
26. Single-particle structure of neutron-rich Sr isotopes via $^{2}\mathrm{H}(^{94,95,96}\mathrm{Sr}, p)$ 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., Voss, P.J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,Nuclear Structure - Abstract
International audience; 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
27. Shell evolution approaching the $N=20$ island of inversion: Structure of $^{29}$Mg
- Author
-
Matta, A., Catford, W.N., Orr, N.A., Henderson, J., Ruotsalainen, P., Hackman, G., Garnsworthy, A.B., Delaunay, F., Wilkinson, R., Lotay, G., Tsunoda, Naofumi, Otsuka, Takaharu, Knapton, A.J., Ball, G.C., Bernier, N., Burbadge, C., Chester, A., Cross, D.S., Cruz, S., Diget, C.Aa., Domingo, T., Drake, T.E., Evitts, L.J., Garcia, F.H., Hallam, S., Macconnachie, E., Moukaddam, M., Muecher, D., Padilla-Rodal, E., Paetkau, O., Park, J., Pore, J.L., Rizwan, U., Smallcombe, J., Smith, J.K., Starosta, K., Svensson, C.E., Williams, J., Williams, M., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure ,Nuclear Experiment - Abstract
The "Island of Inversion" for neutron-rich nuclei in the vicinity of N=20 has become the testing ground par excellence for our understanding and modelling of shell evolution with isospin. In this context, the structure of the transitional nucleus 29Mg is critical. The first quantitative measurements of the single particle structure of 29Mg are reported, using data from the d(28Mg,p gamma)29Mg reaction. Two key states carrying significant ell=3 (f-wave) strength were identified at 2.40 +/- 0.10 (Jpi = 5/2-) and 4.28 +/- 0.04 MeV (7/2-). New state-of-the-art shell model calculations have been performed and the predictions are compared in detail with the experimental results. Whilst the two lowest 7/2- levels are well described, the sharing of single-particle strength disagrees with experiment for both the 3/2- and 5/2- levels and there appear to be general problems with configurations involving the p3/2 neutron orbital and core-excited components. These conclusions are supported by an analysis of the neutron occupancies in the shell model calculations., Comment: 15 pages, 10 figures, 4 tables
- Published
- 2019
28. Shape coexistence and mixing of low-lying 0+ states in 96Sr
- 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.
- Published
- 2018
- Full Text
- View/download PDF
29. Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg
- Author
-
Henderson, J., Hackman, G., Ruotsalainen, P., Stroberg, S.R., Launey, K.D., Holt, J.D., Ali, F.A., Bernier, N., Bentley, M.A., Bowry, M., Caballero-Folch, R., Evitts, L.J., Frederick, R., Garnsworthy, A.B., Garrett, P.E., Jigmeddorj, B., Kilic, A.I., Lassen, J., Measures, J., Muecher, D., Olaizola, B., O'Sullivan, E., Paetkau, O., Park, J., Smallcombe, J., Svensson, C.E., Wadsworth, R., and Wu, C.Y.
- Published
- 2018
- Full Text
- View/download PDF
30. Reorientation-effect measurement of the first 2+ state in 12C: Confirmation of oblate deformation
- Author
-
Kumar Raju, M., Orce, J.N., Navrátil, P., Ball, G.C., Drake, T.E., Triambak, S., Hackman, G., Pearson, C.J., Abrahams, K.J., Akakpo, E.H., Al Falou, H., Churchman, R., Cross, D.S., Djongolov, M.K., Erasmus, N., Finlay, P., Garnsworthy, A.B., Garrett, P.E., Jenkins, D.G., Kshetri, R., Leach, K.G., Masango, S., Mavela, D.L., Mehl, C.V., Mokgolobotho, M.J., Ngwetsheni, C., O'Neill, G.G., Rand, E.T., Sjue, S.K.L., Sumithrarachchi, C.S., Svensson, C.E., Tardiff, E.R., Williams, S.J., and Wong, J.
- Published
- 2018
- Full Text
- View/download PDF
31. 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
32. Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of Mg
- Author
-
Henderson, J., Hackman, G., Ruotsalainen, P., Stroberg, S.R., Launey, K.D., Holt, J.D., Ali, F.A., Bernier, N., Bentley, M.A., Bowry, M., Caballero-Folch, R., Evitts, L.J., Frederick, R., Garnsworthy, A.B., Garrett, P.E., Jigmeddorj, B., Kilic, A.I., Lassen, J., Measures, J., Muecher, D., Olaizola, B., O'Sullivan, E., Paetkau, O., Park, J., Smallcombe, J., Svensson, C.E., Wadsworth, R., and Wu, C.Y.
- Abstract
Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be studied within a microscopic or ab initio framework without the use of effective charges; for example with the proper evolution of the E2 operator, or alternatively, through the use of an appropriate and manageable subset of particle–hole excitations. We present a precise determination of E2 strength in 22Mg and its mirror 22Ne by Coulomb excitation, allowing for rigorous comparisons with theory. No-core symplectic shell-model calculations were performed and agree with the new B(E2) values while in-medium similarity-renormalization-group calculations consistently underpredict the absolute strength, with the missing strength found to have both isoscalar and isovector components. The discrepancy between two microscopic models demonstrates the sensitivity of E2 strength to the choice of many-body approximation employed.
- Published
- 2018
33. The CsI ball ancillary detector array for TIP and TIGRESS at TRIUMF
- Author
-
Williams, J., primary, Andreoiu, C., additional, Ball, G.C., additional, Bernier, N., additional, Bowry, M., additional, Bhattacharjee, S.S., additional, Burbadge, C., additional, Caballero-Folch, R., additional, Chester, A., additional, Garcia, F.H., additional, Garnsworthy, A.B., additional, Gillespie, S.A., additional, Hackman, G., additional, Henderson, R., additional, Jigmeddorj, B., additional, Jones, C., additional, Kowalski, P., additional, Lafleur, R., additional, MacLean, A.D., additional, Morrison, M., additional, Olaizola, B., additional, Saito, Y., additional, Sexton, L., additional, Šiurytė, P., additional, Smallcombe, J., additional, Starosta, K., additional, Svensson, C.E., additional, Spencer, M., additional, Timakova, E., additional, Van Wieren, K., additional, Voss, P., additional, Winokan, M., additional, and Wu, F., additional
- Published
- 2019
- Full Text
- View/download PDF
34. Reorientation-effect measurement of the first 2 State in C: Confirmation of oblate deformation
- Author
-
Kumar Raju, M., Orce, J.N., Navrátil, P., Ball, G.C., Drake, T.E., Triambak, S., Hackman, G., Pearson, C.J., Abrahams, K.J., Akakpo, E.H., Al Falou, H., Churchman, R., Cross, D.S., Djongolov, M.K., Erasmus, N., Finlay, P., Garnsworthy, A.B., Garrett, P.E., Jenkins, D.G., Kshetri, R., Leach, K.G., Masango, S., Mavela, D.L., Mehl, C.V., Mokgolobotho, M.J., Ngwetsheni, C., O'Neill, G.G., Rand, E.T., Sjue, S.K.L., Sumithrarachchi, C.S., Svensson, C.E., Tardiff, E.R., Williams, S.J., and Wong, J.
- Abstract
A Coulomb-excitation reorientation-effect measurement using the TIGRESS γ−ray spectrometer at the TRIUMF/ISAC II facility has permitted the determination of the 〈21+‖E2ˆ‖21+〉 diagonal matrix element in $^{12}$C from particle−γ coincidence data and state-of-the-art no-core shell model calculations of the nuclear polarizability. The nuclear polarizability for the ground and first-excited (21+) states in $^{12}$C have been calculated using chiral NN N$^{4}$LO500 and NN+3NF350 interactions, which show convergence and agreement with photo-absorption cross-section data. Predictions show a change in the nuclear polarizability with a substantial increase between the ground state and first excited 21+ state at 4.439 MeV. The polarizability of the 21+ state is introduced into the current and previous Coulomb-excitation reorientation-effect analyses of $^{12}$C. Spectroscopic quadrupole moments of QS(21+)=+0.053(44) eb and QS(21+)=+0.08(3) eb are determined, respectively, yielding a weighted average of QS(21+)=+0.071(25) eb, in agreement with recent ab initio calculations. The present measurement confirms that the 21+ state of $^{12}$C is oblate and emphasizes the important role played by the nuclear polarizability in Coulomb-excitation studies of light nuclei.
- Published
- 2017
35. Recoil distance method lifetime measurement of the ${2}_{1}^{+}$ state in $^{94}$Sr and implications for the structure of neutron-rich Sr isotopes
- Author
-
Chester, A., Ball, G.C., Caballero-Folch, R., Cross, D.S., Cruz, S., Domingo, T., Drake, T.E., Garnsworthy, A.B., Hackman, G., Hallam, S., Henderson, J., Henderson, R., Korten, W., Krücken, R., Moukaddam, M., Olaizola, B., Ruotsalainen, P., Smallcombe, J., Starosta, K., Svensson, C.E., Williams, J., Wimmer, K., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; A high precision lifetime measurement of the 21+ state in Sr94 was performed at TRIUMF's ISAC-II facility by coupling the recoil distance method implemented via the TIGRESS integrated plunger with unsafe Coulomb excitation in inverse kinematics. Due to limited statistics imposed by the use of a radioactive Sr94 beam, a likelihood ratio χ2 method was derived and used to compare experimental data to Geant4 simulations. The B(E2;21+→01+) value extracted from the lifetime measurement of 7.80−0.40+0.50(stat.)±0.07(sys.) ps is approximately 25% larger than previously reported while the relative error has been reduced by a factor of approximately 8. A baseline deformation has been established for Sr isotopes with N≤58 which is a necessary condition for the quantum phase transition interpretation of the onset of deformation in this region. A comparison to existing theoretical models is presented.
- Published
- 2017
36. Nuclear Structure Studied with Direct Reactions for Fundamental Symmetry Tests
- Author
-
Garrett, P.E., primary, Leach, K.G., additional, MacLean, A.D., additional, Ball, G.C., additional, Bender, P.C., additional, Bildstein, V., additional, Brown, B.A., additional, Burbadge, C., additional, Diaz Varela, A., additional, Dunlop, R., additional, Faestermann, T., additional, Hadinia, B., additional, Hertenberger, R., additional, Holt, J.D., additional, Laffoley, A.T., additional, Jamieson, D.S., additional, Jigmeddorj, B., additional, Radich, A.J., additional, Rand, E.T., additional, Stroberg, S.R., additional, Svensson, C.E., additional, Towner, I.S., additional, Triambak, S., additional, and Wirth, H.-F., additional
- Published
- 2018
- Full Text
- View/download PDF
37. Half-lives of neutron-rich Cd 128-130
- Author
-
Dunlop, R., Bildstein, V., Dillmann, I., Jungclaus, Andrea, Svensson, C.E., Andreoiu, C., Ball, G.C., Bernier, N., Bidaman, H., Boubel, P., Burbadge, C., Caballero-Folch, R., Turko, J., Zidar, T., Canada Research Chairs, Natural Sciences and Engineering Research Council of Canada, University of Guelph, Ministerio de Economía y Competitividad (España), National Science Foundation (US), Universidad Nacional Autónoma de México, Canada Foundation for Innovation, and Ministerio de Ciencia e Innovación (España)
- Abstract
R. Dunlop et al. ; 6 págs.; 7 figs.; 1 tab. ; Rapid Communications, The β-decay half-lives of Cd128-130 have been measured with the newly commissioned GRIFFIN γ-ray spectrometer at the TRIUMF-ISAC facility. The time structures of the most intense γ rays emitted following the β decay were used to determine the half-lives of Cd128 and Cd130 to be T1/2=246.2(21) ms and T1/2=126(4) ms, respectively. The half-lives of the 3/2+ and 11/2- states of Cd129 were measured to be T1/2(3/2+)=157(8) ms and T1/2(11/2-)=147(3) ms. The half-lives of the Cd isotopes around the N=82 shell closure are an important ingredient in astrophysical simulations to derive the magnitude of the second r-process abundance peak in the A∼130 region. Our new results are compared with recent literature values and theoretical calculations. ©2016 American Physical Society, This work has been partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canada Research Chairs Program. I.D. and R.C.-F. are supported by NSERC Discovery Grants SAPIN-2014-00028 and RGPAS 462257-2014. A.J. acknowledges financial support by the Spanish Ministerio de Ciencia e Innovación under contract FPA2011-29854-C04 and the Spanish Ministerio de Economía y Competitividad under contract FPA2014- 57196-C5-4-P. S.L.T acknowledges financial support from the U.S. National Science Foundation under contract NSF- 14-01574. E.P.-R. acknowledges financial support from the DGAPA-UNAM under the PASPA program. The GRIFFIN spectrometer was funded by the Canada Foundation for Innovation, TRIUMF, and the University of Guelph. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada.
- Published
- 2016
38. Scattering Of The Halo Nucleus 11Be On A 197Au Target At Energies Around The Coulomb Barrier
- Author
-
G. Borge, Maria J, primary, Pesudo, Vicente, additional, Nácher, Enrique, additional, Tengblad., Olof, additional, Cubero., Mario, additional, Perea, Angel, additional, Moro, A. M., additional, Lay, Josè A., additional, Gómez-Camacho., Joaquin., additional, Alvarez, M. A. G., additional, Fernandez-Garcia, Juan Pablo, additional, Di Prieto, A., additional, Figuera, Pierpaolo, additional, Fisichella., M., additional, Lattuada., M., additional, Scuderi, V., additional, Marquínez-Durán, Gloria, additional, Martel., Ismael, additional, Sánchez-Benítez, Angel M., additional, Alcorta., Martin, additional, Bender, P. C., additional, Braid., R., additional, Garnsworthy, A. B., additional, Hackman., Gregory, additional, Miller., D., additional, Moukaddam., M., additional, Rajabali., M.M., additional, Unsworth., C., additional, Wang, Z.M., additional, Fulton, Brian R., additional, Hager, U., additional, Kirsebom, Oliver, additional, Kuhn., K., additional, O'Malley., P.D., additional, Sarazin, Frederique, additional, and Svensson, C.E., additional
- Published
- 2017
- Full Text
- View/download PDF
39. Investigating the nature of the Er isotopes with ( p , t ) reactions
- Author
-
Garrett, Paul, primary, Burbadge, C., additional, Kisliuk, D., additional, Ball, G.C., additional, Bildstein, V., additional, Dunlop, M.R., additional, Diaz Varela, A., additional, Dunlop, R., additional, Faestermann, T., additional, Hertenberger, R., additional, Jamieson, D.S., additional, Leach, K.G., additional, Loranger, J., additional, MacLean, A.D., additional, Radich, A.J., additional, Rand, E.T., additional, Rebeiro, B., additional, Svensson, C.E., additional, Triambak, S., additional, and Wirth, H.-F., additional
- Published
- 2017
- Full Text
- View/download PDF
40. High-statistics $\beta $-decay Measurements at TRIUMF-ISAC and the Transition from the $8\pi $ Spectrometer to GRIFFIN
- Author
-
Garrett, P.E., primary, Jigmeddorj, B., additional, MacLean, A.D., additional, Bidaman, H., additional, Bildstein, V., additional, Burbadge, C., additional, Demand, G.A., additional, Diaz Varela, A., additional, Dunlop, M., additional, Dunlop, R., additional, Hadinia, B., additional, Olaizola, B., additional, Svensson, C.E., additional, Turko, J., additional, Zidar, T., additional, Garnsworthy, A.B., additional, Bowry, M., additional, Bender, P.C., additional, Ball, G.C., additional, Caballero-Folch, R., additional, Dillmann, I., additional, Hackman, G., additional, Henderson, J., additional, Mills, W.J., additional, Moukaddam, M., additional, Park, J., additional, Pearson, C.J., additional, Ruotsalainen, P., additional, Smallcombe, J., additional, Smith, J.K., additional, Andreoiu, C., additional, Cross, D.S., additional, Pore, J.L., additional, and Starosta, K., additional
- Published
- 2017
- Full Text
- View/download PDF
41. Advances at TRIUMF-ISAC and decay of neutron-rich Cd studied with GRIFFIN.
- Author
-
Köster, U., Garrett, P.E., Bernier, N., Dunlop, R., MacLean, A.D., Bildstein, V., Dillmann, I., Jungclaus, A., Svensson, C.E., Andreoiu, C., Ball, G.C., Bidaman, H., Boubel, P., Burbadge, C., Caballero-Folch, R., Dunlop, M.R., Evitts, L.J., Garcia, F., Garnsworthy, A.B., and Hackman, G.
- Subjects
CADMIUM ,RADIOACTIVE decay ,METASTABLE states ,GROUND state energy ,DELAYED neutrons - Abstract
The β-decay half lives of nuclei near the r-process path are critical information required for abundance calculations, especially those near neutron number N = 82. Specifically, the nuclei below doubly-magic
132 Sn are key, and play an important role in the formation and shape of the second r-process abundance peak. The half lives in this region are challenging to measure due to the significant β-delayed neutron decay branches and the population of isomeric states with half lives comparable to the ground states. However, by measuring the time distribution of γ rays, these complications can be eliminated. This requires, however, a very effcient γ-ray spectrometer since the production of isotopes in this region is very limited. The new GRIFFIN array at TRIUMF-ISAC provides the high effciency required for these measurements. Recent improvements in the quality of the beams produced at TRIUMF, employing the IG-LIS device, are outlined, as well as the current status of the ARIEL facility. The GRIFFIN spectrometer and its use are briefly described. The experiment to measure the half lives of128-130 Cd is outlined and the results given, and some examples of the power of GRIFFIN to expand decay schemes, specifically for the decay of128 Cd to128 In, are given. [ABSTRACT FROM AUTHOR]- Published
- 2018
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
- Full Text
- View/download PDF
43. Structure of $^{26}$Na via a Novel Technique Using ($d,p\gamma $) with a Radioactive $^{25}$Na Beam
- Author
-
Catford, W.N., primary, Celik, I.C., additional, Wilson, G.L., additional, Matta, A., additional, Orr, N.A., additional, Diget, C.Aa., additional, Adsley, P., additional, Al-Falou, H., additional, Ashley, R., additional, Austin, R.A.E., additional, Ball, G.C., additional, Blackmon, J.C., additional, Boston, A.J., additional, Boston, H.C., additional, Brown, S.M., additional, Cross, D.S., additional, Djongolov, M., additional, Drake, T.E., additional, Hager, U., additional, Fox, S.P., additional, Fulton, B.R., additional, Galinski, N., additional, Garnsworthy, A.B., additional, Hackman, G., additional, Jamieson, D., additional, Kanungo, R., additional, Leach, K., additional, Martin, J-P., additional, Orce, J.N., additional, Pearson, C.J., additional, Porter-Peden, M., additional, Sarazin, F., additional, Sjue, S., additional, Sumithrarachchi, C., additional, Svensson, C.E., additional, Triambak, S., additional, Unsworth, C., additional, Wadsworth, R., additional, and Williams, S.J., additional
- Published
- 2015
- Full Text
- View/download PDF
44. DESCANT andβ-delayed neutron measurements at TRIUMF
- Author
-
Bildstein, V., primary, Garrett, P.E., additional, Ashley, S.F., additional, Ball, G.C., additional, Bianco, L., additional, Bandyopadhyay, D., additional, Bangay, J., additional, Crider, B.P., additional, Demand, G., additional, Deng, G., additional, Dillmann, I., additional, Finlay, A., additional, Garnsworthy, A.B., additional, Hackman, G., additional, Hadinia, B., additional, Krücken, R., additional, Leach, K.G., additional, Martin, J-P., additional, McEllistrem, M.T., additional, Pearson, C.J., additional, Peters, E.E., additional, Prados-Estévez, F.M., additional, Radich, A., additional, Sarazin, F., additional, Sumithrarachchi, C., additional, Svensson, C.E., additional, Vanhoy, J.R., additional, Wong, J., additional, and Yates, S.W., additional
- Published
- 2015
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.