13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

New decay modes of the high-spin isomer of $^{124}$Cs

16 Jun 2015, 15:00
15m
CCIS L1-140 (University of Alberta)

CCIS L1-140

University of Alberta

Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Nuclear Physics / Physique nucléaire (DNP-DPN) T2-5 Nuclear Structure II (DNP) / Structure nucléaire II (DPN)

Speaker

Allison Radich (University of Guelph)

Description

As part of a broader program to study the evolution of collectivity in the even-even nuclei above tin, a series of $\beta$-decay measurements of the odd-odd Cs isotopes into the even-even Xe isotopes, specifically $^{122,124,126}$Xe, have been made utilizing the 8$\pi$ spectrometer at TRIUMF-ISAC. The 8$\pi$ spectrometer consisted of 20 Compton-suppressed high-purity germanium (HPGe) detectors and the Pentagonal Array of Conversion Electron Spectrometers (PACES), an array of 5 Si(Li) conversion electron detectors. The decay of $^{124}$Cs to $^{124}$Xe is the first measurement to be fully analyzed. A very high-statistics data set was collected and the $\gamma\gamma$ coincidence data were analyzed, greatly extending the $^{124}$Xe level scheme. Several weak $\it{E2}$ transitions into excited 0$^+$ states in $^{124}$Xe were observed. The $\it{B(E2)}$ transition strengths of such low-spin transitions are very important in determining collective properties, which are currently poorly characterized in the region of the neutron-deficient xenon isotopes. A new $\beta^+$/EC-decay branch from a high-spin isomeric state of $^{124}$Cs has been observed for the first time. Decay of the isomer ($J^\pi$ = (7)$^+$, $T_{1/2}$ = 6.3(2) s) is seen to populate high-spin states in the $^{124}$Xe daughter nucleus that are otherwise inaccessible through the $\beta$-decay of the 1$^+$ $^{124}$Cs ground state. Combining $\gamma\gamma$ as well as $\gamma$-electron coincidence data, several new transitions in the isomeric decay of the (7)$^+$ state have been observed. The characterization of the new $\beta$-decay branch and the isomeric decay of the high-spin state will be presented.

Primary author

Allison Radich (University of Guelph)

Co-authors

Adam Garnsworthy (TRIUMF) Alejandra Diaz Varela (University of Guelph) Alex Laffoley (University of Guelph) Badamsambuu Jigmeddorj (University of Guelph) Baharak Hadinia (University of Guelph) Carl Svensson (University of Guelph) Chandana Sumithrarachchi (NSCL, Michigan State University) Corina Andreoiu (Simon Fraser University) David Cross (Simon Fraser University) Evan Rand (University of Guelph) Gordon Ball (TRIUMF) Greg Hackman (TRIUMF) James Wong (University of Guelph) John Wood (Georgia Institute of Technology) Julien Michetti-Wilson (University of Guelph) Krzysztof Starosta (Simon Fraser University) Kyle Leach (TRIUMF) Laura Bianco (DESY Photon Science) Mustafa Rajabali (Tennessee Technological University) Nico Orce (University of the Western Cape) Paul Finlay (Katholieke Universiteit Leuven (BE)) Paul Garrett (University of Guelph) Ryan Dunlop (University of Guelph) Scott Williams (NSCL, Michigan State University) Smarajit Triambak (University of the Western Cape) Sohpie Chagnon-Lessard (University of Ottawa) Steven Yates (University of Kentucky) Vinzenz Bildstein (University of Guelph) Zhimin Wang (TRIUMF)

Presentation Materials