10-16 June 2018
Dalhousie University
America/Halifax timezone
Welcome to the 2018 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2018!

Half-Lives of the Neutron-Rich $N\approx82$ Isotopes $^{128-130}$Cd and $^{131}$In (G)*

11 Jun 2018, 12:15
SUB 302 (cap.40) (Dalhousie University)

SUB 302 (cap.40)

Dalhousie University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Nuclear Physics / Physique nucléaire (DNP-DPN) M1-5 Nuclear Astrophysics (DNP) | Astrophysique nucléaire (DPN)


Ryan Dunlop (University of Guelph)


Half-lives of $N=82$ nuclei below doubly-magic $^{132}$Sn are key input parameters for calculations of any astrophysical $r$-process scenario and play an important role in the formation and shape of the second $r$-process abundance peak. In the past, shell-model calculations of neutron-rich nuclei near the $N=82$ neutron shell closure that are not yet experimentally accessible have been performed by adjusting the quenching of the Gamow-Teller (GT) operator to reproduce the $^{130}$Cd half-life reported in Ref. [1]. The calculated half-lives of other nuclei in the region are known to be systematically too long. Recently, a shorter half-life for $^{130}$Cd was reported [2,3]. A re-scaling of the GT quenching to the new $^{130}$Cd half-life by a constant factor for all nuclei in the region resolved the discrepancy. However, the reduced quenching of the GT operator creates a new discrepancy in the calculated half-life of $^{131}$In. The measurement of $^{131}$In is complicated due to the presence of three known $\beta$-decaying states with roughly the same half-life, making photopeak gating an ideal method to measure each of these half-lives. In this talk, the half-lives of $^{128-130}$Cd and $^{131}$In, as well as the spectroscopy of $^{131}$Sn, measured using the GRIFFIN $\gamma$-ray spectrometer at TRIUMF will be presented.

[1] M. Hannawald et al., Nucl. Phys. A 688, 578 (2001).
[2] R. Dunlop et al., Phys. Rev. C 93, 062801(R)
[3] G. Lorusso et al., Phys. Rev. Lett. 114, 192501 (2015).

Primary authors

Ryan Dunlop (University of Guelph) Iris Dillmann Carl Svensson (University of Guelph) Corina Andreoiu (Simon Fraser University) Gordon Ball (TRIUMF) Nikita Bernier (TRIUMF) Harris Bidaman (University of Guelph) Ms Paula Boubel (University of Guelph) Christina Burbadge Dr Roger Caballero-Folch (Triumf) Michelle Dunlop (University of Guelph) Lee Evitts (TRIUMF) Fatima Garcia (Simon Fraser University) Dr Garnsworthy Adam B. (TRIUMF) Paul Garrett (University of Guelph) Greg Hackman (TRIUMF) Mr Hallam Sam (TRIUMF) Dr Jack Henderson (TRIUMF) Dr Ilyushkin Sergei (Colorado School of Mines) Dylan Perry Kisliuk (University of Toronto (CA)) Reiner Kruecken (TRIUMF) Jens Lassen (TRIUMF) Mrs Ruohong Li (TRIUMF) Ms E MacConnachie (TRIUMF) Andrew MacLean (University of Guelph) Ms McGee Erin (University of Guelph) Mohamad Moukaddam (TRIUMF) Bruno Olaizola Mampaso (University of Guelph (CA)) Dr E Padilla-Rodal (ICN-UNAM) Jason Park (University of British Columbia/TRIUMF) Mr Paetkau Owen (TRIUMF) Costel Petrache (University Paris Sud) Jennifer Pore Allison Radich (university of Guelph) Dr Ruotsalainen Panu (TRIUMF) james smallcombe Jenna Smith (TRIUMF) Ms Andrea Teigelhoefer (TRIUMF) Joseph Turko (University of Guelph) Tammy Zidar (University of Guelph) V. Bildstein (University of Guelph)

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