Gamma-Gamma Angular Correlation in the Decay of Chlorine-34

Abstract

The directional angular correlation between the 1.16- and 2.10-Mev gamma rays which follow the decay of 32.4-minute ${\mathrm{Cl}}^{34}$ has been measured. Samples of ${\mathrm{Cl}}^{34}$ were produced in the cyclotron of the University of California, Los Angeles by the ($p, \mathrm{pn}$) reaction and were produced in both solid and liquid form. Sodium iodide scintillation counters with subsequent pulse-height discrimination and standard coincidence techniques were used and the method was tested on the cascade of ${\mathrm{Ni}}^{60}$ giving satisfactory agreement with previous results. The results on ${\mathrm{S}}^{34}$, although not unambiguous, are consistent with the assignment of spin 2 and even parity to both the first and second excited states of ${\mathrm{S}}^{34}$ with the 1.16-Mev gamma ray being 1.7% electric quadrupole and 98.3% magnetic dipole radiation.