G. Hackman
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View article: A \(\beta \)-decay Study of the Low-spin Structure of \(^{98}\)Zr
A \(\beta \)-decay Study of the Low-spin Structure of \(^{98}\)Zr Open
A high-statistics \(\beta \)-decay experiment was conducted at the TRIUMF-ISAC facility using the \(8\pi \) \(\gamma \)-ray spectrometer and its ancillary detectors to study the low-spin structure of \(^{98}\)Zr. The analysis of \(\gamma \…
View article: First Measurement of a Weak <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi></mml:math>-Process Reaction on a Radioactive Nucleus
First Measurement of a Weak -Process Reaction on a Radioactive Nucleus Open
This Letter reports on the first cross-section measurements for the ^{94}Sr(α,n)^{97}Zr and ^{86}Kr(α,n)^{89}Sr reactions. In particular, our measurement of ^{94}Sr(α,n)^{97}Zr is the first weak r-process reaction cross section obtained us…
View article: Proton inelastic scattering reveals deformation in <sup>8</sup>He
Proton inelastic scattering reveals deformation in <sup>8</sup>He Open
A measurement of proton inelastic scattering of 8He at 8.25A MeV at TRIUMF shows a resonance at 3.54(6) MeV with a width of 0.89(11) MeV. The energy of the state is in good agreement with coupled cluster and no-core shell model with contin…
View article: Reevaluation of structures in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Se</mml:mi><mml:mprescripts/><mml:none/><mml:mn>70</mml:mn></mml:mmultiscripts></mml:math> from combined conversion-electron and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>-ray spectroscopy
Reevaluation of structures in from combined conversion-electron and -ray spectroscopy Open
In the selenium isotopes various shape phenomena are present, in particular, the emergence of a dominant oblate deformation in the most neutron-deficient isotopes has been observed. The scenario of shape coexisting oblate and prolate bands…
View article: Coulomb Excitation of $^{80}$Sr and the limits of the $N = Z = 40$ island of deformation
Coulomb Excitation of $^{80}$Sr and the limits of the $N = Z = 40$ island of deformation Open
The region of $N\approx Z\approx 40$ has long been associated with strongly deformed nuclear configurations. The presence of this strong deformation was recently confirmed through lifetime measurements in $N\approx Z$ Sr and Zr nuclei. The…
View article: First application of Markov chain Monte Carlo-based Bayesian data analysis to the Doppler-shift attenuation method
First application of Markov chain Monte Carlo-based Bayesian data analysis to the Doppler-shift attenuation method Open
Motivated primarily by the large uncertainties in the thermonuclear rate of the 30P(p,γ)31S reaction that limit our understanding of classical novae, we carried out lifetime measurements of 31S excited states using the Doppler Shift Lifeti…
View article: Measurement of the <sup>86</sup>Kr(α,n)<sup>89</sup>Sr cross section at energies relevant for the weak r-process
Measurement of the <sup>86</sup>Kr(α,n)<sup>89</sup>Sr cross section at energies relevant for the weak r-process Open
The r-process has been shown to be robust in reproducing the abundance distributions of heavy elements, such as europium, seen in ultra-metal poor stars. In contrast, observations of elements 26 < Z < 47 display overabundances relative to …
View article: Degradation of thin carbon-backed lithium fluoride targets bombarded by 68 MeV 17O beams
Degradation of thin carbon-backed lithium fluoride targets bombarded by 68 MeV 17O beams Open
To analyze the cause of the destruction of thin, carbon-backed lithium fluoride targets during a measurement of the fusion of 7Li and 17O, we estimate theoretically the lifetimes of carbon and LiF films due to sputtering, thermal evaporati…
View article: Improved measurement of the $0_2^+\rightarrow0_1^+$ E0 transition strength for $^{72}$Se using the SPICE spectrometer
Improved measurement of the $0_2^+\rightarrow0_1^+$ E0 transition strength for $^{72}$Se using the SPICE spectrometer Open
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 dripline. In this work a study of $^…
View article: First Direct Measurement of an Astrophysical <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Process Reaction Cross Section Using a Radioactive Ion Beam
First Direct Measurement of an Astrophysical -Process Reaction Cross Section Using a Radioactive Ion Beam Open
We have performed the first direct measurement of the ^{83}Rb(p,γ) radiative capture reaction cross section in inverse kinematics using a radioactive beam of ^{83}Rb at incident energies of 2.4 and 2.7A MeV. The measured cross section at a…
View article: First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos.
First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos. Open
Reactions on the proton-rich nuclides drive the nucleosynthesis in Core-Collapse Supernovae (CCSNe) and in X-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the interstellar medium and hence are a potential inventory of p-nu…
View article: The novel Mechanical Ventilator Milano for the COVID-19 pandemic
The novel Mechanical Ventilator Milano for the COVID-19 pandemic Open
This paper presents the Mechanical Ventilator Milano (MVM), a novel intensive therapy mechanical ventilator designed for rapid, large-scale, low-cost production for the COVID-19 pandemic. Free of moving mechanical parts and requiring only …
View article: Multiple Shape Coexistence in <sup>110,112</sup>Cd and Beyond Mean Field Calculations
Multiple Shape Coexistence in <sup>110,112</sup>Cd and Beyond Mean Field Calculations Open
Detailed spectroscopy employing the β + /EC decay of 110,112 In and the β − decay of 112 Ag has been used to study the excited states of 110,112 Cd. Low-energy decay branches from highly excited states have been observed and, combined with…
View article: Single-particle structure in neutron-rich Sr isotopes approaching the N = 60 shape transition
Single-particle structure in neutron-rich Sr isotopes approaching the N = 60 shape transition Open
Background: Neutron-rich nuclei around neutron number N = 60 show a dramatic shape transition from spherical ground states to prolate deformation in 98Sr and heavier nuclei. Purpose: The purpose of this study is to investigate the single-p…
View article: Coulomb excitation of the $\left|T_z\right|=\frac{1}{2}$, $A=23$ mirror pair and systematics of ab-initio $E2$ strength
Coulomb excitation of the $\left|T_z\right|=\frac{1}{2}$, $A=23$ mirror pair and systematics of ab-initio $E2$ strength Open
Background: Recent developments in {\it ab initio} nuclear theory demonstrate promising results in medium- to heavy-mass nuclei. A particular challenge for many of the many-body methodologies, however, is an accurate treatment of the elect…
View article: Single-Particle Structure of Neutron-Rich Sr Isotopes Via d( 94,95,96 Sr, p) Reactions
Single-Particle Structure of Neutron-Rich Sr Isotopes Via d( 94,95,96 Sr, p) Reactions Open
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. Th…
View article: Advances at TRIUMF-ISAC and decay of neutron-rich Cd studied with GRIFFIN
Advances at TRIUMF-ISAC and decay of neutron-rich Cd studied with GRIFFIN Open
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 i…
View article: Characteristics of GRIFFIN high-purity germanium clover detectors
Characteristics of GRIFFIN high-purity germanium clover detectors Open
The Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei, GRIFFIN, is a new experimental facility for radioactive decay studies at the TRIUMF-ISAC laboratory. The performance of the 16 high-purity germanium (HPGe) clover detec…