[en] Full text: The Isotope Separator and Accelerator (ISAC) facility at TRIUMF in Vancouver, British Columbia, makes use of a 500 MeV proton beam with intensities up to 100 μA to produce radioactive ion beams (RIBs) by the Isotope Separation On Line (ISOL) technique. At present, low energy ion beams from the ion source are delivered to several experimental stations that address a range of nuclear physics issues, many of which are important for precision tests of the Standard Model of particle physics. These include the TRIUMF Neutral Atom Trap (TRINAT) facility, the TRIUMF Ion Trap for Atomic and Nuclear Science (TITAN) facility, the 8π gamma-ray spectrometer, the General Purpose Station (GPS) 4π gas counter, and the Radon-Electric Dipole Moment (EDM) set up. There exists significant collaboration amongst the members of these facilities in various experiments. In this talk I will present an overview of the scientific motivation of the above mentioned experimental facilities, and their relevance to the broad rubric of Standard Model tests. I will also present results from a few recently concluded experiments

[en] We describe a high-precision measurement of the half-life of the T = 1/2 nucleus ¹⁹Ne, performed at TRIUMF, Canada's National Laboratory for Nuclear and Particle Physics, Vancouver, Canada. Some implications of this measurement related to tests of the Standard Model are discussed.

[en] In this paper, we describe a measurement of the ¹⁹Ne half-life with high precision (∼0.05%) and accuracy. We also obtain data from the same experiment to extract the 1/2⁺ → 1/2⁺ branch for this isospin T = 1/2 mirror transition. Together, these experimental results are important for precision tests of the Standard Model and an analysis of the parity mixing of the states in ¹⁹F.

[en] We populated states in ³³Cl that are useful for an accurate calibration of the β-delayed proton spectrum from ³³Ar using ³²S(p,γ) resonances and obtained precise values for excitation energies by measuring the energies of the de-excitation gamma rays. In addition, we obtained an upper limit of 0.3 keV on the width of the second excited J^π=3/2⁺ state in ³³Cl, which removes an apparent discrepancy with the width observed in ³³Ar decay. Our results may play an important role in determining the e⁺-ν correlation from ³²Ar β decay

[en] We present precision measurements of the ³He+⁴He → ⁷Be reaction in the range E_c.m.=0.33 to 1.23 MeV using a small gas cell and detection of both prompt γ rays and ⁷Be activity. Our prompt and activity measurements are in good agreement within the experimental uncertainty of several percent. We find S(0)=0.595±0.018 keV b from fits of the Kajino theory to our data. We compare our results with published measurements, and we discuss the consequences for Big Bang Nucleosynthesis and for solar neutrino flux calculations

[en] We determined the mass of the lowest T = 2 state in 32S with unprecedented accuracy and precision (ΔM/M ≅ 10-5). The state was produced via the 31P(p,γ) reaction and the energies of the de-excitation γ rays measured with high accuracy. This, together, with a recent measurement of the mass of 32Ar provides a stringent test of the Isobaric Multiplet Mass Equation (IMME) for the A = 32 multiplet. A significant violation of the IMME is observed

[en] We produced the lowest T=2 state in ³²S with the ³¹P(p,γ) reaction and measured the energies of the deexcitation γ rays, obtaining an excitation energy of 12047.96±0.28 keV that disagrees with a previous value of 12045.0±0.4 keV. Our result, together with a recent measurement of the ³²Ar mass, makes the A=32 multiplet the most precisely measured T=2 quintet and provides easily the most stringent test of the isobaric multiplet mass equation. A significant violation of the isobaric multiplet mass equation is observed that could be explained by mixing with a nearby T=0 level

[en] The TRIUMF-ISAC Gamma-Ray Escape- Suppressed Spectrometer (TIGRESS) will consist of 12 large-volume, 32-fold segmented HPGe clover detectors. Each detector is shielded by a 20-fold segmented Compton suppression shield. For performing discrete gamma-ray spectroscopy of light mass nuclei with TIGRESS, we need information about full energy peak efficiency, resolution and lineshape of full energy peaks for high energy gamma-rays. However, suitable radioactive sources having decay gamma-rays of energies greater than ∼ 3.5 MeV are not easily available. So the characteristics of gamma spectrometers at energies higher than 3.5 MeV are usually determined from simulation data. Predictions from GEANT4 simulations (experimentally validated from 0.3 to 3 MeV) indicate that TIGRESS will be capable for single 10 MeV gamma-rays of absolute detection efficiency of 1.5% for backward configuration of the array. It has been observed experimentally that simulation results work well up to certain energies and might deviate at higher energies. So, it is essential to check the validity of simulation results for energies above 3.3 MeV. We have investigated the high energy performance of seven TIGRESS detectors up to 8 MeV

[en] We have determined the energy of the J^π=1/2⁺ , T=3/2 resonance in ³²S( p, p) to be E_p=3374.7±0.8 keV . This disagrees with the previously accepted value of E_p=3370±1 keV by Abbondanno et al. [Nuovo Cimento 70A, 391 (1970)] and solves a problem raised by recent observations of unexpected deviations from the isobaric multiplet mass equation. This resonance is also important in calibrating the β -delayed proton spectra from ³³Ar and ³²Ar , and our findings may modify previous conclusions

[en] Cadmium isotopes have been presented for decades as excellent examples of vibrational nuclei, with low-lying levels interpreted as multi-phonon quadrupole, octupole, and mixed-symmetry states. A large amount of spectroscopic data has been obtained through various experimental studies of cadmium isotopes. In the present work, the "1"1"1Cd(d,p)"1"1"2Cd reaction was used to investigate the single-particle structure of the "1"1"2Cd nucleus. A 22 MeV beam of polarized deuterons was obtained at the Maier-Leibnitz laboratory in Garching, Germany. The reaction ejected components were momentum analyzed using a Q3D spectrograph, and 130 levels have been identified up to 4.2 MeV of excitation energy. Using DWBA analysis with optical model calculations, spin-parity assignments have been made for observed levels, and spectroscopic factors have been extracted from the experimental angular distributions of differential cross section and analyzing power. In this high energy resolution investigation, many additional levels have been observed compared with a previous (d,p) study using 8 MeV deuterons. There were a total of 44 new levels observed, and the parity assignments of 34 levels were improved. The standard interpretation of "1"1"2Cd as a vibrational nucleus will be reassessed in light of the new spectroscopic data from this experiment, including the distribution of single-particle strength for the transfer