The purpose of this experiment was to find the total electromagnetic decay width of 7. Both pair emission to the ground state and the gamma cascade through the first excited Z.+ state have been observed. see Figure 1) he obtained for the branching ratio of the 3. A 1 rectangular slot is mounted in the counter holder to define the solid angle of the alpha detector.
The signal lead ia made to the back surface of the silicon with conductive silver paint. Therefore, less gain was needed in the alpha channel to obtain the required pulse height for the operation of the coincidence mixer. The output pulses were fed to the coincidence mixer and to the upper-beam input of the oscilloscope; the wrist height of an 8.
The response of our film was much higher in the blue region of the spectrum. The film provides additional information about the time separation of the two chickens. Identification of groups helped by obtaining such spectra in a range of moment (magnet).
In Figure Zla, these random coincidences provide a measure of the resolution time of the randomness mixer.
If the result of each run is to be weighted inversely as the square of the error • it is. The calculation of the various factors appearing in equation 16 and the final calculation of rrad/£' are given in the following sections. Repeating the experiment under more unfavorable conditions (instability of the device for measuring the magnetic field and rapid deterioration of the target) showed that the error should be doubled.
The momentum p y ia carried by the emitted gami'j:la or gamma, and the resulting defiection of the return ion h +• measured at. For small angle•, the angle "' is proportional to the p component of p parallel to the ray axis. of the probability distribution for the values of Pz determines the probability distribution for "'·. 7. 656 MeV /c) and the difference (1. ZlO 'MeV /c) of tvv'O garnms with a probability distribution derived from the equation Zl.
Account was also taken of the fact that the opening represented by the function R(6) was not necessarily at cp = O.) The total effective solid angle for coincidence detection is. There is also a correction for the relative efficiency since the width of the group is a function of energy. Above in Table VIU are the calculated energy losses at each of the three ion energies for the various targets used.
The factor T required for the relative efficiency is the ratio of the percentage of the second state group that is within mo·. In Table XI, the W weighting factors are calculated for each of the individual runes listed in Table IV. Combining the external error with an estimated systematic error So/o in the quantity T, the result of the experiment is
A repetition of the inelastic electron scattering experiment may be necessary to determine the absolute value of r e*. The locations of the foci F and F' and the corresponding principal planes H and H' are shown in Fig. U relative to the back surface of the beam. Since the deflection angle of the core is small, its projection into the horizontal plane iB is exactly Ill= Pz/p.
Abo, if the slit h is not short compared to its distance from the center of the sphere. T is the ratio of the fraction of the second state to the fraction of the first state within the window.
PLAN OF EXPERIMENT
Heating was carried out by bombardment with a beam of alpha particles in the direct port of the accelerator. The efficiency of differential pumping and cold trap regulation has been shown to be such that an am.
NITRIDING CHAMBER
The momentum spectrum of elastically scattered protons with an incident energy of 1 MeV, as measured with a 10i inch magnetic spectrometer at a laboratory angle of 150°. The ''rectangular'' slit, mounted in the retainer, at a distance of 8 inches from the center of the chamber, determines the solid angle of the detector; Slits of various sizes were made.
VARIABLE ANGLE TARGET CHAMBER
COUNTER MOUNT
The forward and reverse current-voltage ch3 characteristics of the gold-silicon surface barrier counters were measured as shown in the figure. Tunnel diodes are used at both inputs of the mixer as discriminators, and the tunnel diode is also used for the mixer. Note that the output was a random pulse from point B, with a plate load of 220 ohms on the output tube.
The locations of the focal planes F and F' and the corresponding principal planes H and H' are shown measured in inches from the back surface of the mounting ring when the distance setting on the objective is 6 feet. CAMERA MAIN BOARD 0 0 BEATTIE-COLEMAN MODEL CS-48 ELECTRIC FILM SUBSCRIBER 35mm OSCILLOSCOPE CAMERA FIGURE II. A suitable pule (eg 8-V. O. 6-.,.aec) at the "trigger input" switches the silicon controlled rectifier (SCR) into ita conduction mode and the current through the lOK resistor keeps it conducting while the current in the relay coil builds up.
When the film has moved far enough to open the micro-active with the camera, the relay is opened and the sea is turned off; Power is then supplied to the motor through the microlil switch until the film has advanced one frame. The relay is also used to operate a Sodeco counter which is used to count the frames on the film. In addition to elastically scattered deuterons and reaction products (panda), three recoU nuclear groups appear in this spectrum, obtained with a solid-state counter at the focus of the alternating gradient spectrometer.
ENERGY SPECTRUM AT SPECTROMETER
FOCUS
CHANNEL NUMBER FIGURE
The effect of the dead layer of the used gold-silicon surface barrier counter is that the heavy ion group loci cross zero momentum at −11 channels on the energy scale. The heavy cross indicates the location of the second-state c12(3+} recoil ion group; note that it is in a region of low background. This is also a measure of the momentum width of the recoil ion group; purpose for this data was C6-I used.
With the spectrometer current and delay set, the alpha counter angle e was varied to find the maximum c12(4+)-a1 coincidence count rate. 0) alpha p~.rticles, and thus the maximum rate is 2 R. Correlated coincidence spectrum The number of counts (area scale on the right) is plotted as a function of the energies of the coincident particles, EC1 2 and E 01 , and the difference in time of flight from 162 nsec. Then the two energies can be found by projecting the point onto the base plane.
Note that they cannot be distinguished based on these uncorrelated spectra; they were identified in Figures 19 and 20.
NOTAT/ON FOR SOLID ANGLE CALCULATIONS
The sum of the results from each of the five targets used to obtain data is shown!.!· target thickness, to show that target thickness affects havl.
