The TRIUMF nuclear structure program and TIGRESS

Garrett, P. E.; Andreyev, A. N.; Austin, R. A. E.; Ball, G. C.; Bandyopadhyay, D.; Becker, J. A.; Boston, A. J.; Boston, H. C.; Chakrawarthy, R. S.; Churchman, R.; Cline, D.; Cooper, R. J.; Cross, D. S.; Dashdorj, D.; Demand, G. A.; Dimmock, Matthew; Drake, T.E.; Finlay, P.; Gagnon, Katherine; Gallant, A. T.; Green, K. L; Grint, A. N.; Grinyer, G. F.; Hackman, G.; Harkness, L. J.; Hayes, A. B.; Kanungo, R.; Kulp, W. D.; Leach, K. G.; Lee, G; Leslie, J. R.; Maharaj, Ritesh; Martín, J. P.; Mattoon, Caleb; Mills, W. J.; Morton, A. C.; Nelson, L.; Newman, O.; Nolan, P. J.; Padilla‐Rodal, E.; Pearson, C. J.; Phillips, A. A.; Porter-Peden, M.; Ressler, J. J.; Ruiz, C.; Sarazin, F.; Schumaker, M. A.; Scraggs, D.P.; Strange, Mikkel; Subramanian, Mythili; Svensson, C. E.; Waddington, J. C.; Wan, J. M.; Whitbeck, A.; Williams, S. J.; Wood, John L.; Wong, J.; Wu, C. Y.; Zganjar, E. F.

doi:10.1016/j.nimb.2007.04.258

Cited by 23 publications

(10 citation statements)

References 13 publications

(2 reference statements)

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“…The 110 In decay experiment was performed with the 8π γ-ray spectrometer [17] at the TRIUMF-ISAC facility. A 65-µA, 500-MeV proton beam was directed onto a nat Ta target.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

Detailed spectroscopy of110Cd: Evidence for weak mixing and the emergence ofγ-soft behavior

Garrett¹,

Bangay²,

Varela³

et al. 2012

Phys. Rev. C

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A study of the β + /EC decay of 110 In into levels of 110 Cd is combined with a reanalysis of data from a previous study of 110 Cd with the (n, n ′ γ) reaction with monoenergetic neutrons. The γγ coincidences from the 110 In decay leads to many new assignments of γ rays observed in the (n, n ′ γ) reaction, permitting the observation of weak low-energy transitions, and setting stringent upper limits on unobserved decay branches. The uncertainties on many of the lifetimes from the (n, n ′ γ) reaction are significantly reduced, and limits are established for the lifetimes of levels too long for a direct measurement. The absence of enhanced transitions between the previously assigned phonon states and the deformed intruder states strongly suggests that mixing between the configurations is generally weak, refuting the strong-mixing scenario as an explanation of the decay pattern of the excited 0 + states in 110 Cd. The decay pattern of the non-intruder states is suggestive of a γ-soft rotor, or O(6) nucleus, rather than a vibrational, or U (5) pattern. The existence of a 4p − 6h proton excitation in 110 Cd is also suggested.

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“…The 110 In decay experiment was performed with the 8π γ-ray spectrometer [17] at the TRIUMF-ISAC facility. A 65-µA, 500-MeV proton beam was directed onto a nat Ta target.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

Detailed spectroscopy of110Cd: Evidence for weak mixing and the emergence ofγ-soft behavior

Garrett¹,

Bangay²,

Varela³

et al. 2012

Phys. Rev. C

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“…Such experiments can highlight the states carrying significant fractions of the single-particle strength, in the populated nuclei. The isac-ii facility at triumf [2] is ideal for this type of study, as it is able to produce intense sodium beams in the relevant range of energies (∼ 5 − 10 MeV/nucleon), and it also houses tigress [3,4], a highly efficient germanium array. The design of sharc is an evolution of the tiara array [5], which achieved success in investigating the changing shell structure of light nuclei via transfer reactions [6].…”

Section: Introductionmentioning

confidence: 99%

Towards²⁶Na via (d,p) with SHARC and TIGRESS and a novel zero-degree detector

Wilson

Catford

Diget

et al. 2012

J. Phys.: Conf. Ser.

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Abstract. Nucleon transfer experiments have in recent years begun to be exploited in the study of nuclei far from stability, using radioactive beams in inverse kinematics. New techniques are still being developed in order to perform these experiments. The present experiment is designed to study the odd-odd nucleus 26 Na which has a high density of states and therefore requires gamma-ray detection to distinguish between them. The experiment employed an intense beam of up to 3 × 10 7 pps of 25 Na at 5.0 MeV/nucleon from the isac-ii facility at triumf. The new silicon array sharc was used for the first time and was coupled to the segmented clover gamma-ray array tigress. A novel thin plastic scintillator detector was employed at zero degrees to identify and reject reactions occurring on the carbon component of the (CD)2 target. The efficiency of the background rejection using this detector is described with respect to the proton and gamma-ray spectra from the (d,p) reaction.

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“…To test for the presence of isobaric contaminants in the mass-separated A = 62 beam, a β-γ coincidence spectrum was obtained [18] using the 20 HPGe detectors of the 8πγ -ray spectrometer [19] and the 20 plastic scintillators of the scintillating electron-positron tagging array (SCEPTAR) [20,21]. The beam-on time was 30 s (as opposed to 0.5 s in the half-life measurement) in order to enhance the relative activities of the longer-lived isobars.…”

Section: Resultsmentioning

confidence: 99%

“…The bin times were varied on a run-by-run basis between 8, 10, and 12 ms in this experiment. The decay collection time therefore spanned 2.0-3.0 s or [17][18][19][20][21][22][23][24][25][26] 62 Ga half-lives. Beam pulsing, tape movement intervals, and dwell times were controlled through a Jorway controller in CAMAC.…”

Section: A Experimentsmentioning

confidence: 99%

High-precision half-life determination for the superallowedβ+emitterGa62

et al. 2008

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The half-life of the superallowed β + emitter 62 Ga has been measured at TRIUMF's Isotope Separator and Accelerator facility using a fast-tape-transport system and 4π continuous-flow gas proportional counter to detect the positrons from the decay of 62 Ga to the daughter 62 Zn. The result, T 1/2 = 116.100 ± 0.025 ms, represents the most precise measurement to date (0.022%) for any superallowed β-decay half-life. When combined with six previous measurements of the 62 Ga half-life, a new world average of T 1/2 = 116.121 ± 0.021 ms is obtained. This new half-life measurement results in a 20% improvement in the precision of the 62 Ga superallowed f t value while reducing its mean by 0.9σ to f t = 3074.3(12) s. The impact of this half-life measurement on precision tests of the CVC hypothesis and isospin symmetry breaking corrections for A 62 superallowed decays is discussed.

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The TRIUMF nuclear structure program and TIGRESS

Cited by 23 publications

References 13 publications

Detailed spectroscopy of110Cd: Evidence for weak mixing and the emergence ofγ-soft behavior

Detailed spectroscopy of110Cd: Evidence for weak mixing and the emergence ofγ-soft behavior

Towards²⁶Na via (d,p) with SHARC and TIGRESS and a novel zero-degree detector

High-precision half-life determination for the superallowedβ+emitterGa62

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The TRIUMF nuclear structure program and TIGRESS

Cited by 23 publications

References 13 publications

Detailed spectroscopy of110Cd: Evidence for weak mixing and the emergence ofγ-soft behavior

Detailed spectroscopy of110Cd: Evidence for weak mixing and the emergence ofγ-soft behavior

Towards26Na via (d,p) with SHARC and TIGRESS and a novel zero-degree detector

High-precision half-life determination for the superallowedβ+emitterGa62

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Product

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Towards²⁶Na via (d,p) with SHARC and TIGRESS and a novel zero-degree detector