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79 results on '"Bidaman, H."'

1. Identifying the spin trapped character of the $^{32}$Si isomeric state

Author

Williams, J., Hackman, G., Starosta, K., Lubna, R. S., Choudhary, Priyanka, Srivastava, P. C., Andreoiu, C., Annen, D., Asch, H., Badanage, M. D. H. K. G., Ball, G. C., Beuschlein, M., Bidaman, H., Bildstein, V., Coleman, R., Garnsworthy, A. B., Greaves, B., Leckenby, G., Karayonchev, V., Martin, M. S., Natzke, C., Petrache, C. M., Radich, A., Raleigh-Smith, E., Rhodes, D., Russell, R., Satrazani, M., Spagnoletti, P., Svensson, C. E., Tam, D., Wu, F., Yates, D., and Yu, Z.

Subjects
Nuclear Experiment
Abstract

The properties of a nanosecond isomer in $^{32}$Si, disputed in previous studies, depend on the evolution of proton and neutron shell gaps near the `island of inversion'. We have placed the isomer at 5505.2(2) keV with $J^{\pi} = 5^-$, decaying primarily via an $E3$ transition to the $2^+_1$ state. The $E3$ strength of 0.0841(10) W.u. is unusually small and suggests that this isomer is dominated by the $(\nu d_{3/2})^{-1} \otimes (\nu f_{7/2})^{1}$ configuration, which is sensitive to the $N=20$ shell gap. A newly observed $4^+_1$ state is placed at 5881.4(13) keV; its energy is enhanced by the $Z=14$ subshell closure. This indicates that the isomer is located in a `yrast trap', a feature rarely seen at low mass numbers., Comment: Accepted, Physical Review C

Published
2023

2. Decay Spectroscopy of $^{160}$Eu: Quasiparticle Configurations of Excited States and Structure of $K^\pi$=$4^+$ Band-heads in $^{160}$Gd

Author

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.

Subjects
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.

Published
2023
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3. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in $^{74}$Zn: Suggestion for a Northern Extension of the $N=40$ Island of Inversion

Author

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., and Zidar, T.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

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.

Published
2023
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4. Decay spectroscopy of Eu160: Quasiparticle configurations of excited states and structure of Kπ=4+ bandheads in Gd160

Author

Yates, D, Krücken, R, Dillmann, I, Garrett, PE, Olaizola, B, Vedia, V, Ali, FA, Andreoiu, C, Ashfield, W, Ball, GC, Beadle, Z, Bernier, N, Bhattacharjee, SS, Bidaman, H, Bildstein, V, Bishop, D, Bowry, M, Burbadge, C, Caballero-Folch, R, Chaney, DZ, Cross, DC, Varela, A Diaz, Dunlop, MR, Dunlop, R, Evitts, LJ, Garcia, FH, Garnsworthy, AB, Georges, S, Gillespie, SA, Hackman, G, Henderson, J, Jigmeddorj, B, Lassen, J, Li, R, Luna, BK, MacLean, AD, Natzke, CR, Petrache, CM, Radich, AJ, Rajabali, MM, Regan, PH, Saito, Y, Smallcombe, J, Smith, JK, Spieker, M, Svensson, CE, Teigelhöfer, A, Whitmore, K, and Zidar, T

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

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. Purpose: We aim to improve the understanding of the nuclear structure of Gd160, specifically the Kπ=4+ bands, as well as study the β decay of Eu160 into Gd160. Methods: High-statistics decay spectroscopy of Gd160 resulting from the β-decay of Eu160 was collected using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. Results: Two new excited states and ten new transitions were observed in Gd160. The β-decaying half-lives of the low- and high-spin isomers in Eu160 were determined, and the low-spin state's half-life was measured to be t1/2=26.0(8) s, ≈16% shorter than previous measurements. Lifetimes of the two Kπ=4+ bandheads in Gd160 were measured for the first time, as well as γ-γ angular correlations and mixing ratios of intense transitions out of those bandheads. Conclusions: Lifetimes and mixing ratios suggest that the hexadecapole phonon model of the Kπ=4+ bandheads in Gd160 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 Gd160 heavily populated in β decay is shown to have positive parity, which raises questions regarding the structure of the high-spin β-decaying state in Eu160.

Published
2023

5. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in Zn74: Suggestion for a Northern Extension of the N=40 Island of Inversion

Author

Rocchini, M, Garrett, PE, Zielińska, M, Lenzi, SM, Dao, DD, Nowacki, F, Bildstein, V, MacLean, AD, Olaizola, B, Ahmed, ZT, Andreoiu, C, Babu, A, Ball, GC, Bhattacharjee, SS, Bidaman, H, Cheng, C, Coleman, R, Dillmann, I, Garnsworthy, AB, Gillespie, S, Griffin, CJ, Grinyer, GF, Hackman, G, Hanley, M, Illana, A, Jones, S, Laffoley, AT, Leach, KG, Lubna, RS, McAfee, J, Natzke, C, Pannu, S, Paxman, C, Porzio, C, Radich, AJ, Rajabali, MM, Sarazin, F, Schwarz, K, Shadrick, S, Sharma, S, Suh, J, Svensson, CE, Yates, D, and Zidar, T

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

The excited states of N=44 ^{74}Zn were investigated via γ-ray spectroscopy following ^{74}Cu β decay. By exploiting γ-γ angular correlation analysis, the 2_{2}^{+}, 3_{1}^{+}, 0_{2}^{+}, and 2_{3}^{+} states in ^{74}Zn were firmly established. The γ-ray branching and E2/M1 mixing ratios for transitions deexciting 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}^{+}→0_{2}^{+} and 2_{3}^{+}→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.

Published
2023

8. 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., and Zidar, T.

Subjects
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
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9. High-Precision Branching Ratio Measurement and Spin Assignment Implications for $^{62}$Ga Superallowed $\beta$ Decay

Author

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
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10. 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., and Zidar, T.

Subjects
Nuclear Experiment, Nuclear Theory
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
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11. $\beta$ 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., and Zidar, T.

Subjects
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
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12. 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

13. Shape coexistence in the neutron-deficient lead region: A systematic study of lifetimes in the even-even $^{188-200}$Hg with GRIFFIN

Author

Olaizola, B., Garnsworthy, A. B., Ball, G. C., Bernier, N., Bowry, M., Caballero-Folch, R., Dillmann, I., Georges, S., Hackman, G., Smallcombe, J., Smith, J. K., Southall, D., Timakova, E., Umashankar, R., Ali, F. A., Bidaman, H., Bildstein, V., Burbadge, C., Varela, A. Diaz, Dunlop, R. A., Dunlop, M., Garrett, P. E., Hadina, B., Jigmeddorj, B., Kisliuk, D., Laffoley, A., MacLean, A., Muecher, D., Radich, A., Rand, E. T., Svensson, C. E., Turko, J., Zidar, T., Andreoiu, C., Garcia, F., Pore, J. L., Rizwan, U., Starosta, K., Voss, P., and Williams, J.

Subjects
Nuclear Experiment
Abstract

Lifetimes of $2^+_1$ and $4^+_1$ states, as well as some negative-parity and non-yrast states, in $^{188-200}$Hg were measured using $\gamma-\gamma$ electronic fast timing techniques with the LaBr$_3$(Ce) detector array of the GRIFFIN spectrometer. The excited states were populated in the $\epsilon/\beta^+$-decay of $J^\pi =7^+/2^-$ $^{188-200}$Tl produced at the TRIUMF-ISAC facility. The deduced B(E2) values are compared to different interacting boson model predictions. The precision achieved in this work over previous ones allows for a meaningful comparison with the different theoretical models of these transitional Hg isotopes, which confirms the onset of state mixing in $^{190}$Hg.

Published
2019
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14. $\beta$ and $\beta$-delayed neutron decay of the $N=82$ nucleus $^{131}_{~49}$In$_{82}$

Author

Dunlop, R., Svensson, C. E., Andreoiu, C., Ball, G. C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D. S., Dillmann, I., Dunlop, M. R., Garcia, F. H., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Henderson, J., Measures, J., Mücher, D., Olaizola, B., Ortner, K., Park, J., Petrache, C. M., Pore, J. L., Smith, J. K., Southall, D., Ticu, M., Turko, J., Whitmore, K., and Zidar, T.

Subjects
Nuclear Experiment
Abstract

The half-lives of three $\beta$ decaying states of $^{131}_{~49}$In$_{82}$ have been measured with the GRIFFIN $\gamma$-ray spectrometer at the TRIUMF-ISAC facility to be $T_{1/2}(1/2^-)=328(15)$~ms, $T_{1/2}(9/2^+)=265(8)$~ms, and $T_{1/2}(21/2^+)=323(55)$~ms, respectively. The first observation of $\gamma$-rays following the $\beta n$ decay of $^{131}$In into $^{130}$Sn is reported. The $\beta$-delayed neutron emission probability is determined to be $P_{1n} = 12(7)\%$ for the $21/2^+$ state and $2.3(3)\%$ from the combined $1/2^-$ and $9/2^+$ states of $^{131}_{~49}$In$_{82}$ observed in this experiment. A significant expansion of the decay scheme of $^{131}$In, including 17 new excited states and 34 new $\gamma$-ray transitions in $^{131}_{~50}$Sn$_{81}$ is also reported. This leads to large changes in the deduced $\beta$ branching ratios to some of the low-lying states of $^{131}$Sn compared to previous work with implications for the strength of the first-forbidden $\beta$ transitions in the vicinity of doubly-magic $^{132}_{~50}$Sn$_{82}$., Comment: 14 pages, 15 figures, 5 tables

Published
2019
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15. Half-Lives of Neutron Rich $^{130}$Cd and $^{131}$In

Author

Dunlop, R., Svensson, C. E., Andreoiu, C., Ball, G. C., Bernier, N., Bildstein, V., Bidaman, H., Boubel, P., Burbadge, C., Caballero-Folch, R., Dillmann, I., Dunlop, M. R., Evitts, L. J., Garcia, F. H., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Hallam, S., Henderson, J., Ilyushkin, S., Jungclaus, A., Krücken, R., Lassen, J., Li, R., MacConnachie, E., MacLean, A. D., McGee, E., Moukaddam, M., Mücher, D., Olaizola, B., Ortner, K., Padilla-Rodal, E., Park, J., Paetkau, O., Pore, J. L., Radich, A. J., Ruotsalainen, P., Smallcombe, J., Smith, J. K., Teigelhöfer, A., Turko, J., Whitmore, K., and Zidar, T.

Subjects
Nuclear Experiment
Abstract

The half-lives of isotopes around the $N=82$ shell closure are an important ingredient in astrophysical simulations and strongly influence the magnitude of the second $r$-process abundance peak in the $A\sim130$ region. The most neutron-rich $N=82$ nuclei are not accessible to the current generation of radioactive beam facilities and $r$-process simulations must therefore rely on calculations of the half-lives of the isotopes involved. Half-life measurements of the experimentally accessible nuclei in this region are important in order to benchmark these calculations. The half-life of $^{130}$Cd is particularly important as it is used to tune the Gamow-Teller quenching in shell-model calculations for the $\beta$ decay of other nuclei in this region. In this work, the GRIFFIN $\gamma$-ray spectrometer at the TRIUMF-ISAC facility was used to measure the half-life of $^{130}_{~48}$Cd$_{82}$ to be $T_{1/2}= 126(4)$ ms. In addition, the half-lives of the three $\beta$ decaying states of $^{131}_{~49}$In$_{82}$ were measured to be $T_{1/2}(1/2^-)=328(15)$ ms, $T_{1/2}(9/2^+)=265(8)$ ms, and $T_{1/2}(21/2^+)=323(50)$ ms, respectively, providing an important benchmark for half-life calculations in this region., Comment: Talk presented CIPANP2018. 9 pages, LaTeX, 5 pdf figures, 1 png figure

Published
2018

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

Author

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

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

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

Published
2018
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17. High-Precision Half-life Measurement for the Superallowed Fermi $\beta^+$ Emitter $^{22}$Mg

Author

Dunlop, M. R., Svensson, C. E., Ball, G. C., Leslie, J. R., Andreoiu, C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Burbadge, C., Caballero-Folch, R., Varela, A. Diaz, Dunlop, R., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Jigmeddorj, B., Leach, K. G., MacLean, A. D., Olaizola, B., Measures, J., Natzke, C., Saito, Y., Smith, J. K., Turko, J., and Zidar, T.

Subjects
Nuclear Experiment
Abstract

A high-precision half-life measurement for the superallowed Fermi $\beta^+$ emitter $^{22}$Mg was performed at the TRIUMF-ISAC facility using a 4$\pi$ proportional gas counter. The result of $T_{1/2} = 3.87400 \pm 0.00079$ s is a factor of 3 more precise than the previously adopted world average and resolves a discrepancy between the two previously published $^{22}$Mg half-life measurements., Comment: 7 pages, 9 figures

Published
2017
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19. Identifying the spin-trapped character of the Si32 isomeric state

Author

Williams, J., primary, Hackman, G., additional, Starosta, K., additional, Lubna, R. S., additional, Choudhary, Priyanka, additional, Srivastava, P. C., additional, Andreoiu, C., additional, Annen, D., additional, Asch, H., additional, Badanage, M. D. H. K. G., additional, Ball, G. C., additional, Beuschlein, M., additional, Bidaman, H., additional, Bildstein, V., additional, Coleman, R., additional, Garnsworthy, A. B., additional, Greaves, B., additional, Leckenby, G., additional, Karayonchev, V., additional, Martin, M. S., additional, Natzke, C., additional, Petrache, C. M., additional, Radich, A., additional, Raleigh-Smith, E., additional, Rhodes, D., additional, Russell, R., additional, Satrazani, M., additional, Spagnoletti, P., additional, Svensson, C. E., additional, Tam, D., additional, Wu, F., additional, Yates, D., additional, and Yu, Z., additional

Published
2023
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20. 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
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21. 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
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22. Coulomb excitation of Ru102 with C12 and O16

Author

Garrett, P. E., primary, Zielińska, M., additional, Bergmaier, A., additional, Rodríguez, T. R., additional, Kalaydjieva, D., additional, Siciliano, M., additional, Bidaman, H., additional, Bildstein, V., additional, Burbadge, C., additional, Varela, A. Diaz, additional, Doherty, D. T., additional, Faestermann, T., additional, Hadyńska-Klȩk, K., additional, Hertenberger, R., additional, Keeley, N., additional, Laffoley, A., additional, MacLean, A. D., additional, Mahgoub, M., additional, Radich, A. J., additional, Rocchini, M., additional, Spagnoletti, P., additional, Triambak, S., additional, Vandebrouck, M., additional, and Wrzosek-Lipska, K., additional

Published
2022
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23. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in Zn74: Suggestion for a Northern Extension of the N=40 Island of Inversion

Author

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.

Published
2023

24. Coulomb excitation of $^{102}\mathrm{Ru}$ with $^{12}\mathrm{C}$ and $^{16}\mathrm{O}$

Author

Garrett, P.E., Zielińska, M., Bergmaier, A., Rodríguez, T.R., Kalaydjieva, D., Siciliano, M., Bidaman, H., Bildstein, V., Burbadge, C., Diaz Varela, A., Doherty, D.T., Faestermann, T., Hadyńska-Klȩk, K., Hertenberger, R., Keeley, N., Laffoley, A., Maclean, A.D., Mahgoub, M., Radich, A.J., Rocchini, M., Spagnoletti, P., Triambak, S., Vandebrouck, M., Wrzosek-Lipska, K., University of Guelph, University of the Western Cape (UWC), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Universidad Autónoma de Madrid (UAM), Argonne National Laboratory [Lemont] (ANL), University of Surrey (UNIS), Ludwig-Maximilians-Universität München (LMU), National Centre for Nuclear Research [Otwock], Narodowe Centrum Badań Jądrowych (NCBJ), Jazan University [Jazan, Saudi Arabia], Sudan University of Science and Technology [Khartoum] (SUST), University of the West of Scotland (UWS), and University of Warsaw (UW)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The Coulomb excitation of Ru102 was performed with beams of C12 and O16 ions. The beam particles scattered at forward angles were momentum analyzed with a magnetic spectrograph. The resolution achieved enabled the populations of the 21+ state, the unresolved 22+/41+, and 24+/31−, doublets of states, and the 32− state to be determined as a function of the scattering angle. These populations are compared with gosia calculations, yielding B(E2;21+→01+)=41.5±2.3 W.u., B(E2;22+→01+)=1.75±0.11 W.u., B(E3;31−→01+)=31.5±3.5 W.u., and B(E3;32−→01+)=6.8±0.5 W.u. The B(E3;31−→01+) value is significantly larger than previously measured. The weakly populated 23+ state, presumed to be a member of the band built on the 02+ state, was observed clearly for a single angle only, and a fit to its population results in B(E2;23+→01+)=0.053±0.011 W.u. Using the known γ-ray branching ratios for the 23+ level, the B(E2;23+→02+) value is calculated to be 18±4 W.u., substantially less than the B(E2;21+→01+). This suggests that the deformation of the 02+ state is lower than that of the 01+ state. The results are compared with beyond-mean-field calculations with the Gogny-D1S interaction using the symmetry-conserving configuration-mixing method.

Published
2022

25. 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
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26. 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

27. High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay

Author

MacLean, AD, Laffoley, AT, Svensson, CE, Ball, GC, Leslie, JR, Andreoiu, C, Babu, A, Bhattacharjee, SS, Bidaman, H, Bildstein, V, Burbadge, C, Bowry, M, Cheng, C, Cross, DS, Diaz-Varela, A, Dillmann, I, Dunlop, MR, Dunlop, R, Evitts, LJ, Finlay, DP, Gillespie, S, Garnsworthy, AB, Garrett, PE, Gopaul, E, Griffin, CJ, Grinyer, GF, Hackman, G, Henderson, J, Jigmeddorj, FB, Leach, KG, Kassanda, E, McAfee, J, Moukaddam, M, Natzke, C, Nittala, S, Olaizola, B, Park, J, Paxman, C, Pore, JL, Porzio, C, Radich, AJ, Ruotsalainen, P, Saito, KY, Sharma, S, Smallcombe, J, Smith, JK, Sultana, R, Turko, J, Williams, J, Yates, D, and Zidar, T

Published
2020

28. Investigating shape coexistence in $^{80,82}$Sr \\with $\beta^+/EC$ decay spectroscopy

Author

Bernier, Nikita, Bucher, Daphney, Orce, Nico, Evitts, L.J., Kibédi, T., Garrett, P.E., Rodrguez, T.R., Abrahams, K.J., Akakpo, E.H., Algora, A., Andreyev, A., Bidaman, H., Bildstein, V., Borge, M.J.G., Buck, S., Briscoe, A., Briz, J.A., Chrysalidis, K., Cubiss, J., Fraile, L.M., Henderson, J., Illana, A., Jenkins, D.G., Korgul, A., Lica, R., Mehl, C.V., Miernik, K., Morales, A.I., Nácher, E., Ngwetsheni, C., Ntshangase, S.S., Ojala, J., Olaizola, B., Orrigo, S., Page, R., Pakarinen, J., Piersa, M., Radich, A., Rothe, S., Rubio, B., Smallcombe, J., Stryjczyk, M., Triambak, S., Valbuena, S., and Wadsworth, R.

Subjects
Detectors and Experimental Techniques
Published
2020

29. 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

30. High-precision branching ratio measurement and spin assignment implications for Ga62 superallowed β decay

Author

MacLean, A. D., primary, Laffoley, A. T., additional, Svensson, C. E., additional, Ball, G. C., additional, Leslie, J. R., additional, Andreoiu, C., additional, Babu, A., additional, Bhattacharjee, S. S., additional, Bidaman, H., additional, Bildstein, V., additional, Burbadge, C., additional, Bowry, M., additional, Cheng, C., additional, Cross, D. S., additional, Diaz-Varela, A., additional, Dillmann, I., additional, Dunlop, M. R., additional, Dunlop, R., additional, Evitts, L. J., additional, Finlay, P., additional, Gillespie, S., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Gopaul, E., additional, Griffin, C. J., additional, Grinyer, G. F., additional, Hackman, G., additional, Henderson, J., additional, Jigmeddorj, B., additional, Leach, K. G., additional, Kassanda, E., additional, McAfee, J., additional, Moukaddam, M., additional, Natzke, C., additional, Nittala, S., additional, Olaizola, B., additional, Park, J., additional, Paxman, C., additional, Pore, J. L., additional, Porzio, C., additional, Radich, A. J., additional, Ruotsalainen, P., additional, Saito, Y., additional, Sharma, S., additional, Smallcombe, J., additional, Smith, J. K., additional, Sultana, R., additional, Turko, J., additional, Williams, J., additional, Yates, D., additional, and Zidar, T., additional

Published
2020
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31. β decay of In132 and spectroscopy of Sn132 and Sb131 with the GRIFFIN spectrometer

Author

Whitmore, K., primary, Andreoiu, C., additional, Garcia, F. H., additional, Ortner, K., additional, Holt, J. D., additional, Miyagi, T., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Cross, D. S., additional, Dunlop, M. R., additional, Dunlop, R., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Henderson, J., additional, Measures, J., additional, Olaizola, B., additional, Park, J., additional, Petrache, C. M., additional, Pore, J. L., additional, Smith, J. K., additional, Southall, D., additional, Svensson, C. E., additional, Ticu, M., additional, Turko, J., additional, and Zidar, T., additional

Published
2020
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32. Collective 2p-2h intruder states in Sn118 studied via β decay of In118 using the GRIFFIN spectrometer at TRIUMF

Author

Ortner, K., primary, Andreoiu, C., additional, Spieker, M., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Cross, D. S., additional, Dunlop, M. R., additional, Dunlop, R., additional, Garcia, F. H., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Henderson, J., additional, Measures, J., additional, Olaizola, B., additional, Park, J., additional, Petrache, C. M., additional, Pore, J. L., additional, Raymond, K., additional, Smith, J. K., additional, Southall, D., additional, Svensson, C. E., additional, Ticu, M., additional, Turko, J., additional, Whitmore, K., additional, and Zidar, T., additional

Published
2020
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33. Quadrupole Deformation of \(^{110}\)Cd Studied with Coulomb Excitation

Author

Wrzosek-Lipska, K., primary, Próchniak, L., additional, Garrett, P.E., additional, Yates, S.W., additional, Wood, J.L., additional, Napiorkowski, P.J., additional, Abraham, T., additional, Allmond, J.M., additional, Bello Garrote, F.L., additional, Bidaman, H., additional, Bildstein, V., additional, Burbadge, C., additional, Chiari, M., additional, Diaz Varela, A., additional, Doherty, D.T., additional, Dutt, S., additional, Hadyńska-Klęk, K., additional, Hlebowicz, M., additional, Iwanicki, J., additional, Jigmeddorj, B., additional, Kisieliński, M., additional, Komorowska, M., additional, Kowalczyk, M., additional, Kumar, R., additional, Marchlewski, T., additional, Matejska-Minda, M., additional, Olaizola, B., additional, Oleszczuk, F., additional, Palacz, M., additional, Pasquali, E., additional, Peters, E.E., additional, Rocchini, M., additional, Sahin, E., additional, Saxena, M., additional, Srebrny, J., additional, and Tucholski, A., additional

Published
2020
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34. Halo-induced large enhancement of soft dipole excitation of 11Li observed via proton inelastic scattering

Author

Tanaka, J., Kanungo, R., Alcorta, M., Aoi, N., Bidaman, H., Burbadge, C., Christian, G., Cruz, S., Davids, B., Diaz Varela, A., Even, J., Hackman, G., Harakeh, M.N., Henderson, J., Ishimoto, S., Kaur, S., Keefe, M., Krücken, R., Leach, K.G., Lighthall, J., Padilla Rodal, E., Randhawa, J.S., Ruotsalainen, P., Sanetullaev, A., Smith, J.K., Workman, O., and Tanihata, I.

Published
2017
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35. Shape coexistence in the neutron-deficient lead region: A systematic study of lifetimes in the even-even Hg188–200 with the GRIFFIN spectrometer at TRIUMF

Author

Olaizola, B., primary, Garnsworthy, A. B., additional, Ali, F. A., additional, Andreoiu, C., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Caballero-Folch, R., additional, Dillmann, I., additional, Hackman, G., additional, Garrett, P. E., additional, Jigmeddorj, B., additional, Kilic, A. I., additional, MacLean, A. D., additional, Patel, H. P., additional, Saito, Y., additional, Smallcombe, J., additional, Svensson, C. E., additional, Turko, J., additional, Whitmore, K., additional, and Zidar, T., additional

Published
2019
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36. β decay and β -delayed neutron decay of the N=82 nucleus In8249131

Author

Dunlop, R., primary, Svensson, C. E., additional, Andreoiu, C., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Cross, D. S., additional, Dillmann, I., additional, Dunlop, M. R., additional, Garcia, F. H., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Hackman, G., additional, Henderson, J., additional, Measures, J., additional, Mücher, D., additional, Olaizola, B., additional, Ortner, K., additional, Park, J., additional, Petrache, C. M., additional, Pore, J. L., additional, Smith, J. K., additional, Southall, D., additional, Ticu, M., additional, Turko, J., additional, Whitmore, K., additional, and Zidar, T., additional

Published
2019
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37. Halo-induced large enhancement of soft dipole excitation of 11 Li observed via proton inelastic scattering

Author

Tanaka, J., primary, Kanungo, R., additional, Alcorta, M., additional, Aoi, N., additional, Bidaman, H., additional, Burbadge, C., additional, Christian, G., additional, Cruz, S., additional, Davids, B., additional, Diaz Varela, A., additional, Even, J., additional, Hackman, G., additional, Harakeh, M.N., additional, Henderson, J., additional, Ishimoto, S., additional, Kaur, S., additional, Keefe, M., additional, Krücken, R., additional, Leach, K.G., additional, Lighthall, J., additional, Padilla Rodal, E., additional, Randhawa, J.S., additional, Ruotsalainen, P., additional, Sanetullaev, A., additional, Smith, J.K., additional, Workman, O., additional, and Tanihata, I., additional

Published
2017
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38. 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

39. High-precision half-life measurement for the superallowed Fermi β+ emitter Mg22

Author

Dunlop, M. R., primary, Svensson, C. E., additional, Ball, G. C., additional, Leslie, J. R., additional, Andreoiu, C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Burbadge, C., additional, Caballero-Folch, R., additional, Varela, A. Diaz, additional, Dunlop, R., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Hackman, G., additional, Jigmeddorj, B., additional, Leach, K. G., additional, MacLean, A. D., additional, Olaizola, B., additional, Measures, J., additional, Natzke, C., additional, Saito, Y., additional, Smith, J. K., additional, Turko, J., additional, and Zidar, T., additional

Published
2017
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40. First Results from Griffin Including The Half-lives Of 128-130Cd

Author

Dunlop, Ryan, primary, Bildstein, V., additional, Dillmann, I., additional, Jungclaus, A., additional, Svensson, C. E., additional, Andreoiu, C., additional, Ball, G C., additional, Bernier, N., additional, Bidaman, H., additional, Boubel, P., additional, Burbadge, C., additional, Caballero-Folch, R., additional, Dunlop, M. R., additional, Evitts, L. J., additional, Garcia, F., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Hackman, G., additional, Hallam, S., additional, Henderson, J., additional, Ilyushkin, S., additional, Kisliuk, D., additional, Krücken, R., additional, Lassen, J., additional, Li, R., additional, MacConnachie, E., additional, MacLean, A. D., additional, McGee, E., additional, Moukaddam, M., additional, Olaizola, B., additional, Padilla-Rodal, E., additional, Park, J., additional, Paetkau, O., additional, Petrache, C., additional, Pore, J. L., additional, Radich, A. J., additional, Ruotsalainen, P., additional, Smallcombe, J., additional, Smith, J., additional, Tabor, S. L., additional, Teigelhöfer, A., additional, Turko, J., additional, and Zidar, T., additional

Published
2017
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41. High-precision Half-life And Branching Ratio Measurements For Superallowed β+ Emitters At TRIUMF-ISAC

Author

Dunlop, Michelle, primary, Laffoley, A. T., additional, Dunlop, R., additional, Andreoiu, C., additional, E. Austin, R. A., additional, Ball, G. C., additional, Ballast, T., additional, Bender, P. C., additional, Bidaman, H., additional, Bildstein, V., additional, Blank, B., additional, Bouzomita, H., additional, Chagnon-Lessard, S., additional, Chester, A., additional, Cross, D. S., additional, Deng, G., additional, Diaz Varela, A., additional, Finlay, P., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Giovinazzo, J., additional, Glister, J., additional, Grinyer, G. F., additional, Grinyer, J., additional, Hackman, G., additional, Hadinia, B., additional, Jamieson, D. S., additional, Jigmeddorj, B., additional, Ketelhut, S., additional, Kisliuk, D., additional, Leach, K.G., additional, Leslie, J. R., additional, MacLean, A. D., additional, Miller, D. W., additional, Mills, W. J., additional, Moukaddam, M., additional, Park, J., additional, Radich, A. J., additional, Rajabali, M. M., additional, Rand, E. T., additional, Starosta, K., additional, Svensson, C. E., additional, Tardiff, E. R., additional, Thomas, J. P., additional, Towner, I. S., additional, Triambak, S., additional, Turko, J., additional, Unsworth, C., additional, Valencik, A., additional, Voss, P., additional, Wang, Z. M., additional, Williams, S., additional, Wong, J., additional, Yates, S. W., additional, and Zganjar, E. F., additional

Published
2017
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42. 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
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43. High-precision half-life measurements for the superallowed Fermi β+ emitter $^{18}$Ne

Author

LAFFOLEY, A. T., SVENSSON, C. E., ANDREOIU, C., BALL, G. C., BENDER, P. C., BIDAMAN, H., BILDSTEIN, V., BLANK, Bertram, CROSS, D. S., DENG, G., VARELA, A. Diaz, DUNLOP, M. R., DUNLOP, R., GARNSWORTHY, A. B., GARRETT, P. E., GIOVINAZZO, J., GRINYER, G.F., GRINYER, J., HACKMAN, G., HADINIA, B., JAMIESON, D. S., JIGMEDDORJ, B., KISLIUK, D., LEACH, K. G., LESLIE, J. R., MACLEAN, A. D., MILLER, D., MILLS, B., MOUKADDAM, M., RADICH, A. J., RAJABALI, M. M., RAND, E. T., THOMAS, J.C., TURKO, J., UNSWORTH, C., VOSS, P., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 23.40.−s, 21.10.Tg, 24.80.+y, 27.20.+n, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

44. 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 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. [ABSTRACT FROM AUTHOR]

Published
2018

45. Half-lives of neutron-richCd128–130

Author

Dunlop, R., primary, Bildstein, V., additional, Dillmann, I., additional, Jungclaus, A., additional, Svensson, C. E., additional, Andreoiu, C., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Boubel, P., additional, Burbadge, C., additional, Caballero-Folch, R., additional, Dunlop, M. R., additional, Evitts, L. J., additional, Garcia, F., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Hackman, G., additional, Hallam, S., additional, Henderson, J., additional, Ilyushkin, S., additional, Kisliuk, D., additional, Krücken, R., additional, Lassen, J., additional, Li, R., additional, MacConnachie, E., additional, MacLean, A. D., additional, McGee, E., additional, Moukaddam, M., additional, Olaizola, B., additional, Padilla-Rodal, E., additional, Park, J., additional, Paetkau, O., additional, Petrache, C. M., additional, Pore, J. L., additional, Radich, A. J., additional, Ruotsalainen, P., additional, Smallcombe, J., additional, Smith, J. K., additional, Tabor, S. L., additional, Teigelhöfer, A., additional, Turko, J., additional, and Zidar, T., additional

Published
2016
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46. Far From ‘Easy’ Spectroscopy with the 8π and GRIFFIN Spectrometers at TRIUMF-ISAC

Author

Garrett, P E, primary, Radich, A J, additional, Allmond, J M, additional, Andreoiu, C, additional, Ball, G C, additional, Bender, P C, additional, Bianco, L, additional, Bildstein, V, additional, Bidaman, H, additional, Braid, R, additional, Burbadge, C, additional, Chagnon-Lessard, S, additional, Cross, D S, additional, Deng, G, additional, Demand, G A, additional, Varela, A Diaz, additional, Dunlop, M R, additional, Dunlop, R, additional, Finlay, P, additional, Garnsworthy, A B, additional, Grinyer, G F, additional, Hackman, G, additional, Hadinia, B, additional, Ilyushkin, S, additional, Jigmeddorj, B, additional, Kisliuk, D, additional, Kuhn, K, additional, Laffoley, A T, additional, Leach, K G, additional, MacLean, A D, additional, Michetti-Wilson, J, additional, Miller, D, additional, Moore, W, additional, Olaizola, B, additional, Orce, J N, additional, Pearson, C J, additional, Pore, J L, additional, Rajabali, M M, additional, Rand, E T, additional, Sarazin, F, additional, Smith, J K, additional, Starosta, K, additional, Sumithrarachchi, C S, additional, Svensson, C E, additional, Triambak, S, additional, Turko, J, additional, Wang, Z M, additional, Wood, J L, additional, Wong, J, additional, Williams, S J, additional, Yates, S W, additional, and Zganjar, E F, additional

Published
2015
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47. High-precision half-life measurements for the superallowed Fermiβ+emitterNe18

Author

Laffoley, A. T., primary, Svensson, C. E., additional, Andreoiu, C., additional, Ball, G. C., additional, Bender, P. C., additional, Bidaman, H., additional, Bildstein, V., additional, Blank, B., additional, Cross, D. S., additional, Deng, G., additional, Varela, A. Diaz, additional, Dunlop, M. R., additional, Dunlop, R., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Giovinazzo, J., additional, Grinyer, G. F., additional, Grinyer, J., additional, Hackman, G., additional, Hadinia, B., additional, Jamieson, D. S., additional, Jigmeddorj, B., additional, Kisliuk, D., additional, Leach, K. G., additional, Leslie, J. R., additional, MacLean, A. D., additional, Miller, D., additional, Mills, B., additional, Moukaddam, M., additional, Radich, A. J., additional, Rajabali, M. M., additional, Rand, E. T., additional, Thomas, J. C., additional, Turko, J., additional, Unsworth, C., additional, and Voss, P., additional

Published
2015
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48. High-Precision Half-Life Measurements for the Superallowed Fermi β+ Emitters 14O and 18Ne

Author

Laffoley, A. T., primary, Andreoiu, C., additional, Austin, R. A. E., additional, Ball, G. C., additional, Bender, P. C., additional, Bidaman, H., additional, Bildstein, V., additional, Blank, B., additional, Bouzomita, H., additional, Cross, D. S., additional, Deng, G., additional, Varela, A. Diaz, additional, Dunlop, M. R., additional, Dunlop, R., additional, Finlay, P., additional, Garnsworthy, A. B., additional, Garrett, P., additional, Giovinazzo, J., additional, Grinyer, G. F., additional, Grinyer, J., additional, Hadinia, B., additional, Jamieson, D. S., additional, Jigmeddorj, B., additional, Ketelhut, S., additional, Kisliuk, D., additional, Leach, K. G., additional, Leslie, J. R., additional, MacLean, A., additional, Miller, D., additional, Mills, B., additional, Moukaddam, M., additional, Radich, A. J., additional, Rajabali, M. M., additional, Rand, E. T., additional, Svensson, C. E., additional, Tardiff, E., additional, Thomas, J. C., additional, Turko, J., additional, Voss, P., additional, and Unsworth, C., additional

Published
2015
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49. HIGH-STATISTICS β-DECAY MEASUREMENTS AT TRIUMF-ISAC AND THE TRANSITION FROM THE 8π SPECTROMETER TO GRIFFIN.

Author

GARRETT, P. E., JIGMEDDORJ, B., MACLEAN, A. D., BIDAMAN, H., BILDSTEIN, V., BURBADGE, C., DEMAND, G. A., VARELA, A. DIAZ, DUNLOP, M., DUNLOP, R., HADINIA, B., OLAIZOLA, B., SVENSSON, C. E., TURKO, J., ZIDAR, T., GARNSWORTHY, A. B., BOWRY, M., BENDER, P. C., BALL, G. C., and CABALLERO-FOLCH, R.

Subjects
RADIOACTIVE decay, X-ray spectrometers, NUCLEAR structure, SILICON detectors, SCINTILLATORS
Abstract

Over a 12 year period, the 8β γ-ray spectrometer at the TRIUMFISAC facility was a world unique device for β-decay studies. Equipped with a variety of auxiliary devices, it was used in studies of Fermi superallowed β+ emitters, and nuclear structure studies far from stability and those employing high-statistics measurements. In the present contribution, this latter use is highlighted with examples of recent data obtained in the decay of 122Cs to 122Xe. The 8β spectrometer was replaced with the much more powerful GRIFFIN facility in 2014, ensuring world-leading capability for γ-ray spectroscopy following β decay at TRIUMF-ISAC for the next generation. Examples that highlight GRIFFIN's capabilities are given. [ABSTRACT FROM AUTHOR]

Published
2017
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50. High-precision half-life measurements for the superallowed Fermi β+ emitter 18Ne.

Author

Laffoley, A. T., Svensson, C. E., Andreoiu, C., Ball, G. C., Bender, P. C., Bidaman, H., Bildstein, V., Blank, B., Cross, D. S., Deng, G., Diaz Varela, A., Dunlop, M. R., Dunlop, R., Garnsworthy, A. B., Garrett, P. E., Giovinazzo, J., Grinyer, G. F., Grinyer, J., Hackman, G., and Hadinia, B.

Subjects
*HALF-life (Nuclear physics), *FERMI energy, *ISOTOPE separation, *COLLIDERS (Nuclear physics), *MEASUREMENT, *EXPERIMENTS
Abstract

The half-life of the superallowed Fermi β+ emitter 18Ne has been determined via two high-precision β counting experiments at TRIUMF's Isotope Separator and Accelerator facility. Using two different 4π continuous-flow gas-proportional counters, two independent measurements were made, yielding a weighted average of T1/2=1.66400+0.00057-0.00048 s, which is consistent with but approximately 2 times more precise than a previous high-precision measurement based on γ-ray counting. The present work achieves ±0.034% precision for the 18Ne half-life and will enable the inclusion of 18Ne among the set of precisely measured superallowed Fermi β-decay ft values once improved measurements are made for its Q value and superallowed branching ratio. As a test of systematic uncertainties, the half-life of 23Ne was measured and the world average has been improved, by a factor of 1.7, to 37.148±0.032 s. [ABSTRACT FROM AUTHOR]

Published
2015
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