C. St-Pierre

Spectroscopic study of 47,49,51V with the (3He, d) reaction at 10 MeV

Abstract The ( 3 He, d) reaction on 46,48,50 Ti was investigated with a 10 MeV beam of doubly-ionized 3 He. The deuterons were analysed with a semiconductor E - ΔE particle identification system. Levels of 47,49,51 V were observed up to excitation energies of 2.22, 4.22 and 4.25 MeV, respectively, with an energy resolution between 80 and 120 keV. The angular distributions were measured at lab angles between 15° and 120° and compared with the predictions of a DWBA calculation using the TSALLY code. The angular momentum transfer was identified as l = 3 for 49,51 V ground states and 47 V 0.15 MeV state, and l = 1 for all the observed excited states of 49,51 V and 47 V ground, 2.08 and 2.22 MeV states. The 0.26 MeV 3 2 + hole state and 1.66 MeV 1 2 + hole state of 47 V were also observed. Spin and parity could be assigned to most levels, and the corresponding spectroscopic factors were determined.

The (3He, α) reactions on even titanium isotopes

Abstract The angular distributions of the alphas from the reactions 46Ti(3He, α)45Ti, 48Ti(3He, a)47Ti and 50Ti(3He, α)49Ti have been measured at E3He = 10 MeV. A number of ln = 3 transitions corresponding to the pick-up of neutrons from the 1 f 7 2 shell, has been observed. We have also found ln = 0 and 2 transitions, indicating that the pick-up can also originate from the 2 s 1 2 and 1 d 3 2 shell. Finally some ln = 1 transitions have been observed, indicating p-wave admixture in the ground state of the even titanium isotopes. Spectroscopic factors have been deduced for the various transitions by means of a DWBA analysis. The experimental results have been compared with the theoretical predictions of the shell model and of the rotational model with Coriolis coupling.

Energy-light relation for CsI(T1) scintillators in heavy ion experiments at intermediate energies

Abstract In this paper an original energy relation for light scintillation in a CsI(T1) detector is established. It is dependent on the charge and mass of the particle (fragment) and is a direct light-to-energy function suitable for the calibration of CsI(T1) detectors used in heavy-ion studies at intermediate energies. Resulting calibration with this function and energy spectra for light ions, obtained from a heavy ion experiment, are presented.

Quasiclassical model of intermediate velocity particle production in asymmetric heavy ion reactions

The particle emission at intermediate velocities in mass asymmetric reactions is studied within the framework of classical molecular dynamics. Two reactions in the Fermi energy domain were modeled,

Origins of intermediate velocity particle production in heavy ion reactions

{}^{58}\mathrm{N}\mathrm{i}+\mathrm{C}

BETA DECAY OF TRITIUM.

and

Pionic Fusion of Heavy Ions

{}^{58}\mathrm{N}\mathrm{i}+\mathrm{A}\mathrm{u}

Étude de la réaction N14(He3, p)O16 entre 2.5 et 5.5 MeV

at 34.5 MeV/nucleon. The availability of microscopic correlations at all times allowed a detailed study of the fragment formation process. Special attention was paid to the physical origin of fragments and emission timescales, which allowed us to disentangle the different processes involved in the midrapidity particle production. Consequently, a clear distinction between a prompt preequilibrium emission and a delayed aligned asymmetric breakup of the heavier partner of the reaction was achieved.

Dissipative binary mechanisms in 24Mg + 12C collisions at 25A and 35A MeV☆

In this paper, we report for the first time clear distinctions between these prompt processes and an alternative phenomenon of delayed aligned asymmetric breakup that populates the intermediate-velocity zone by a deformation rupture of mainly the heavier of the colliding partners in mass asymmetric collisions. These distinctions were observed experimentally with intermediate-velocity particle correlation analysis of Ni+C and Ni+Au reac

On the breakup of excited 16O projectiles into four alphas at intermediate energies

Abstract Four tritium beta spectra were obtained with sources made of tritium adsorbed in Al foils. The effective source thickness is less than 2μg cm 2 of Al. The Th “F” and “A” (corrected for Doppler shift) lines were used for calibration. The experimental data were compared with computed spectra folded with the resolution curve determined from the “F” and “A” line profiles. The momentum resolution is 0.25 %. The end-point of the (β-spectrum is determined to be 18.570 ± 0.075 keV. This decay energy with a half-life of 12.43 y gives a ft value of 1130 ± 15 sec. The analysis of the upper 1 keV part of the spectra gives a probable rest mass of the neutrino mν = 0 with an upper limit of 75 eV.