Lifetime Measurements for the First Excited States inCd107andCd

In-beam fast-timing measurements inCd103,105,107

“…3) imposed on any of the eight HPGe detectors. It agrees the 1.75 (11) ns value, adopted by NNDC [7], which is based on a γ(t) measurement with one NaI(Tl) detector [13]. Fig.…”

“…The half-life of the excited 11/2 − 1 state in 103,105 Cd, measured in present work, allows a systematical study of the E1 transitions strenghts as a function of the neutron number. The half-life T 1/2 =71 ns of the 11/2 − 1 state in 107 has been previously measured [13]. This level decays via a branch of E1, M2 and E3 transitions to 9/2 + , 7/2 + and 5/2 + states with partial half-lives 2.4×10 −7 , 1.0×10 −7 and 4.5×10 −6 s respectively.…”

Penetration effects in107Cd

“…The value of this ratio could be affected by the long lifetime [8] of the 11/2-level, as the 1~ nuclei produced in the last downstream part of the target could recoil into vacuum and decay after they are stopped somewhere on the chamber end-walls. This is not the case for the 205 keV level in l~ whose lifetime is 1.03 ns [3]. The maximum fraction of recoil nuclei escaping from the target was estimated to be about 6 %.…”

“…In this work we report the measurement of the K-internal conversion coefficient c~ K of the 205.0keV MI+E2 transition in ~~ [23 which is /-forbidden and hindered by a factor of 300 (as calculated from the data of [3,4,5]) with respect to the Weisskopf estimate. From the measured value of c~ K and the known value [1][2][3][4] of the mixing ratio 62 , the value of 2 can be obtained. It is to be noted that previous experimental data on c~ K [63 and on the conversion ratio K/L [73 for this transition cannot give significant information on 2 due to their large experimental error.…”

Discovery of the calcium, indium, tin, and platinum isotopes

“…CaO targets were bombarded by 3.1 MeV deuterons at the Yale University cyclotron and proton absorption spectra were recorded. A group of protons with a range of 66 cm was attributed to the formation of 41 Aston observed 42,43 Ca for the first time in 1934 as described in ''Constitution of hafnium and other elements'' [18]. The stable isotopes were identified with an anode discharge tube installed at the Cavendish Laboratory mass spectrograph.…”