15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Gamma-ray spectroscopy in the vicinity of $^{100}$Sn

17 Jun 2014, 10:15
C-114 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Nuclear Physics / Physique nucléaire (DNP-DPN) (T1-4) Mass Spectrometry and Nuclear Structure - DNP / Spectrométrie de masse et structure nucléaire - DPN


Jason Park (University of British Columbia/TRIUMF)


The heaviest doubly-magic and self-conjugate nucleus $^{100}$Sn is known for its super-allowed Gamow-Teller decay with the smallest $\log ft$ value and providing experimental data for quenching effects and $rp$-process path models. In addition, $^{100}$Sn and its neighbouring species offer valuable insights for nuclear structure. Gamma-ray spectroscopy of $^{100}$Sn and nuclei in its vicinity with $N \simeq Z \simeq 50$ will probe single-particle/hole energies near the proton dripline, challenging current large-scale shell models in this $A$ and $Z$ region. The nuclei of interest were produced at RIKEN Rare Isotope Beam Factory in June 2013, where a high-intensity (36 pnA, $2.3 \times 10^{11}$ pps) $^{124}$Xe beam with 345 MeV/u energy was fragmented on a 4-mm Be target. The fragments were identified via energy loss, magnetic rigidity and time-of-flight measurements with BigRIPS and the ZeroDegree Spectrometer. In total, 2035 events of $^{100}$Sn were identified after 8.5 days of beamtime - the largest $^{100}$Sn yield to date by a factor of 8. Many other exotic nuclei with similar $A$ and $Z$ were produced,including previously unobserved species such as $^{98}$Sn and $^{96}$In. These nuclei were implanted in WAS3ABi, a set of position-sensitive silicon strip detectors which measured ion implantation position, $\beta^+$ particles' position and energy. Subsequent $\beta$-delayed gamma-rays were measured with the EURICA spectrometer featuring high-resolution/efficiency HPGe clusters and fast-timing LaBr$_3$ detectors. Of the more abundantly produced nuclei, the level scheme for $^{98}$Ag from the $\beta^+$-decay of $^{98}$Cd has been reproduced with new candidate transitions. Preliminary analysis and level schemes of exotic fragmentation species will be presented.

Primary author

Jason Park (University of British Columbia/TRIUMF)


Presentation Materials