Jonathan H. Williams

Coupling of TIGRESS and EMMA with auxiliary array TIP at TRIUMF

H. Asch, S. A. Gillespie, K. Starosta, Greg Hackman et autres

The combination of a germanium detector array and recoil mass spectrometer allows for high-sensitivity experiments in nuclear structure and astrophysics by enabling high-energy-resolution γ -ray spectroscopy and reaction measurements of weak fusion-evaporation, transfer or radiative-capture reactions in the presence of dominant background …

Direct measurement of $^{59}$Cu($p$,$α$)$^{56}$Ni precludes a strong NiCu cycle in Type-I X-ray bursts

N. Bhathi, J.S. Randhawa, R. Kanungo, J. Refsgaard et autres

Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by nuclear burning and a handful of reactions have been shown to impact the model results. Reactions in …

Coulomb excitation of Sr 80 and the limits of the N ≈ Z ≈ 40 island of deformation

J. Heery, J. Henderson, R. Wadsworth, K. Kaneko et autres

gb, jp, cn, ca, us, ro (code pays fourni par la source)

Mirror symmetry in the f7/2 shell below 56Ni, excited states and electromagnetic transition rates in 55Ni and 55Co

H. Asch, C. Andreoiu, C. Angus, D. Annen et autres

Mirror nuclei near doubly magic 56 Ni are being explored at TRIUMF, Canada's particle accelerator centre. A stable 20 Ne beam experiment to produce 55 Co and a complimentary radioactive 21 Na beam experiment to produce 55 Ni were conducted. These experiments …

ca, us (code pays fourni par la source)

Investigation of the excited states of 114Sn using the GRIFFIN spectrometer at TRIUMF

N.K. Syeda, P. Spagnoletti, C. Andreoiu, Costel Marian Petrache et autres

ca, fr, es, gb (code pays fourni par la source)

First Measurement of a Weak r -Process Reaction on a Radioactive Nucleus

Matthew C. Williams, C. Angus, Alison M Laird, Barry Davids et autres

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 using a radioactive ion beam. This experiment was enabled by the use of …

gb, ca, fr, es, kr, us, de (code pays fourni par la source)

Cross-shell excited states in 32Si and 29Al populated using fusion-evaporation

Jonathan H. Williams, Greg Hackman, K. Starosta, Rebeka Sultana Lubna et autres

ca, us, in, de (code pays fourni par la source)

B ( E 2 ) measurements in the yrast band of Mg 28 : Implications for the N = 20 island of inversion

Matthew S. Martin, H. Asch, G. C. Ball, Paul E. Garrett et autres

High-precision lifetime measurements in $^{28}\mathrm{Mg}$ were performed to study neutron shell evolution in Mg isotopes and the onset of the $N=20$ island of inversion. Using both the recoil distance and Doppler shift attenuation methods, five lifetimes were measured in addition to six …

ca, us, in (code pays fourni par la source)

Reevaluation of structures in Se 70 from combined conversion-electron and γ -ray spectroscopy

J. Smallcombe, A. B. Garnsworthy, W. Korten, Prabhat Kumar Singh et autres

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 has been proposed across the isotopic chain, …

jp, gb, ca, fr, pl, iq, it, fi (code pays fourni par la source)

Cross-shell excited configurations in the structure of Si 34

Rebeka Sultana Lubna, A. B. Garnsworthy, Vandana Tripathi, G. C. Ball et autres

The cross-shell excited states of $^{34}\mathrm{Si}$ have been investigated via $\ensuremath{\beta}$ decays of the ${4}^{\ensuremath{-}}$ ground state and the ${1}^{+}$ isomeric state of $^{34}\mathrm{Al}$. Since the valence protons and valence neutrons occupy different major shells in the ground state as well as …

ca, us, de, it (code pays fourni par la source)

Identifying the spin-trapped character of the Si 32 isomeric state

Jonathan H. Williams, Greg Hackman, K. Starosta, Rebeka Sultana Lubna et autres

The properties of a nanosecond isomer in $^{32}\mathrm{Si}$, 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 ${J}^{\ensuremath{\pi}}={5}^{\ensuremath{-}}$, decaying primarily via an $E3$ …

ca, fr, us, in, de, gb (code pays fourni par la source)

Cross sections of the Rb83(p,γ)Sr84 and Kr84(p,γ)Rb85 reactions at energies characteristic of the astrophysical γ process

Matthew C. Williams, Barry Davids, G. Lotay, Nobuya Nishimura et autres

We have measured the cross section of the $^{83}\mathrm{Rb}(p,\ensuremath{\gamma})^{84}\mathrm{Sr}$ radiative capture reaction in inverse kinematics using a radioactive beam of $^{83}\mathrm{Rb}$ at incident energies of 2.4 and $2.7\phantom{\rule{0.16em}{0ex}}A$ MeV. Prior to the radioactive beam measurement, the $^{84}\mathrm{Kr}(p,\ensuremath{\gamma})^{85}\mathrm{Rb}$ radiative capture reaction was measured …

ca, gb, jp, ch, us (code pays fourni par la source)