Thu·Jan 5, 2017Thursday·January 5, 2017

1. 01*

   Non-coherent character of isoscalar pairing probed with Gamow-Teller strength: New insight into ${}^{14}$C dating $\beta$ decay

   Yutaka Utsuno🇯🇵 · Yoshitaka Fujita

   We investigate the phase coherence of isoscalar pairs from the $B(\mathrm{GT};0_1^{+}T=1\to 1_1^{+}T=0)$ values in two-particle configurations of $A=6$, 18, and 42 nuclei and two-hole configurations of $A=14$ and 38 ones. We find that these Gamow-Teller (GT) matrix elements are always constructive and thus enlarged under isovector- and isoscalar-pairing Hamiltonians, whereas the observed GT strengths are strongly hindered for the two-hole configurations, including the famous ${}^{14}$C dating $\beta$ decay. This indicates that the actual isoscalar pair, unlike the isovector pair, has no definite phase coherence, which can work against forming isoscalar-pair condensates.

   ↳ nucl-thnucl-ex3 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.