The short-lived activities in Cl-34, K38, Ca-39, Li-8, He-6, and O-15 formed by high energy bremmstrahlung irradiation have been examined, and some improved values for the half-lives of these nuclides are reported. A detailed description of the apparatus and procedure is included, together with a discussion of the weighted least mean square analysis used.
I N a recent letter, 1 an attempt was made to fit the 2.291-Mev beta-spectrum of Sb 124 with a linear combination of twiceforbidden factors instead of the once-forbidden p 2 -\-q 2 factor previously proposed. 2 This suggestion arises, in part, from the apparently high comparative half-life (log//=10.1) for the transition.It is interesting to note that in the decay 3 of I 124 , the 2.2-Mev positron transition appears to be in the same excited state of Te 124 . Taking account of the alternative modes of decay, including those by TT-capture, 4 one finds that the comparative half-life for this transition corresponds to log//=8.1, with log(W 0 2 -1)//=9.5. These values are quite in line with those found for other onceforbidden transitions involving a spin-change of 2. The spectrum of I 124 is also fitted by the CIT, P 2 +q 2 factor.According to the nuclear shell model, the state in Sb 124 is best described as 7=3, -f, arising from the combination of a gjn proton and an sm neutron. The state of I 124 is also expected to be 7=3, -H, arising from a
A system is described for obtaining quantitative amplitude distribution data for events which can be displayed as proportional voltage pulses for visual observation on a cathode-ray oscilloscope. The use of a circuit which intensifies the top of each flattened pulse during display permits photographing the events as dots on a moving 35-mm film at rates of 20 000 per sec or greater. An automatic electromechanical ``reader'' is described which will scan the resulting film and produce a printed record of the number of events in each of 100 discrete ``channels'' with an accuracy comparable to the best available from other ``kicksorting'' schemes. A spectrum of over 500 000 events can be recorded on 100 feet of film.
The radiations from antimony bombarded by slow neutrons have been investigated with the help of a magnetic lens spectrometer. Compton electrons, ejected from a copper radiator, and photoelectrons ejected from a thin lead radiator, were measured. Gamma-rays of the following energies were found: 2.062, 1.708, 0.714, 0.650, and 0.603 Mev. The beta-ray spectrum was measured and found to be complex. An analysis according to the Fermi theory gives the possibility of resolving the spectrum into five groups with the following end-point energies and relative abundances: 2.37 Mev, 21 percent; 1.62 Mev, 8 percent; 1.00 Mev, 9 percent; 0.65 Mev, 44 percent; 0.48 Mev, 18 percent. An internal conversion line was detected corresponding to a gamma-ray of 0.603 Mev. A gamma-ray attributed to Sb m (2.8d) was found to have an energy of 0.568 Mev. 1
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