Die elektrischen Kernquadrupolmomente von Cäsium 131 und Cäsium 132 aus Doppelresonanzmessungen am 72 P 3/2-Term

The hyperfine splitting of the 7² P _3/2-state of the radioactive isotopes¹³¹Cs and¹³²Cs has been investigated by optical double resonance. The hyperfine interaction constants deduced from the measured hfs transition frequencies are¹³¹Cs¹³²CsA(7² P _3/2)+31.73(6) MHz +25.03(12) MHzB(7² P _3/2)?28.63(35) MHz + 23.60(60) MHz These values yield spectroscopic nuclear quadrupole momentsQ _s (corrected for the Sternheimer effect) ofQ _s (¹³¹Cs)=?0.57(1) barnQ _s (¹³²Cs)=+0.47(1) barn. The magnetic interaction constantA of¹³²Cs results in a slightly improved precision of the nuclear magnetic dipole momentμ ₁ (¹³²Cs)=+2.22(1)μ _K . The Cesium isotopes have been produced by (d, xn)-reactions on natural Xenon. Total cross sections of the reactions¹³²Xe(d, 2n)¹³²Cs;¹³⁴Xe(d, 4n)¹³²Cs;¹³⁴Xe(d, 2n)¹³⁴Cs;¹³⁶Xe(d, 4n)¹³⁴Cs;¹³⁶Xe(d, 2n)¹³⁶Cs have been measured between 10 and 29 MeV.