[en] An iron septum magnet was designed for the charged-particle beam splitting system. Magnetic field measurements of the septum model magnet with a circular hole were performed for several conditions. The hole field is B₀ = 60-250 G for a hole radius of 12 mm and the gap field is Bsub(g) = 5-6 kG for a gap distance of 8 mm with a septum thickness of 1 mm. The multipole field strength in the circular hole is obtained from the field distribution. (orig.)

[en] Radioactive nuclides sup(81m)Kr, ¹¹¹In and ¹⁵⁷Dy for the nuclear medicine were tried to produce with a 65 MeV proton beam. ⁸¹Sr(25.5 min) produced by the ⁸⁵Rb(p, 5n)⁸¹Sr reaction was chemically separated and the pure decay product ⁸¹Rb was obtained. The decay product sup(81m)Kr will be used for diagnosis of the function of the lungs. Then the extraction efficiency of sup(81m)Kr from the ⁸¹Rb₂SO₄ solution was tested by oxygen gas. The cross sections of the Rb + p reaction were measured by means of the radiochemical method. ¹¹¹In and ¹⁵⁷Dy were also produced by the Cd(p, xn) ¹¹¹In and ¹⁵⁹Tb(p, 3n)¹⁵⁷Dy reactions. Yields of ¹¹¹In and ¹⁵⁷Dy were 0.9 and 10 mCi/μA.h.g/cm² at 45 MeV. (author)

[en] A brief review of the development and application of techniques for measuring positron endpoint energies using intrinsic Ge detectors is given. The calculation of detector response functions using Monte Carlo methods is discussed. Multiple scattering, bremsstrahlung, photoelectron escape and interference from annihilation radiations are considered. The techniques were tested using well known endpoints of the decays of ₂₇Si, ₅₈Cu and ₆₄Ga. Q-values were determined for mass-separated samples of ₇₇Rb and ₇₇Kr produced in heavy ion reactions

[en] Measured electron-capture Q values for ⁷⁶Rb, ⁷⁷Rb, and ⁷⁸Rb are given, and the mass excesses deduced are compared with values derived from direct mass measurements

[en] The distortion of the Kurie plots of allowed positron spectra due to annihilation radiations was calculated by a simple Monte-Carlo technique for a small intrinsic Ge detector. The experimentally observed non-linearity near the end point is accurately reproduced by the calculations. Corrections were calculated for 15 theoretical allowed spectra with end-point energies ranging from 2.5 to 10 MeV for one small detector 1.6 cm in diameter and 0.7 cm thick and one larger detector 4.0 cm in diameter and 1.0 cm thick. The major effect of this interference is to shift the end-point up in energy from 182 keV at 2.5 MeV and to 204 keV at 9 MeV in the small detector and from 279 keV at 2.5 MeV and to 321 keV at 9 MeV in the larger detector. The method was used to correct the end-point energies of the two positron branches in the decay of ⁸²Sr. The corrected data give values of (3.19 +- 0.02) and (2.42 +- 0.02) MeV. The resulting Q-value is (4.21 +- 0.02) MeV. (orig.)

[en] The isotope ⁷⁵Rb was produced via the ⁵⁸Ni(²⁰Ne,p2n) reaction and mass separated with an on-line isotope separator. Its half-life was determined to be 21.4 +- 1.0 sec. Twenty-one γ rays were placed in a partial decay scheme with levels in ⁷⁵Kr up to 1042.4 keV in excitation. The data are consistent with the existence of previously proposed (5/2)⁺ ground-state and (3/2)^- first-excited-state rotational bands in ⁷⁵Kr, and with a (3/2)^- or (5/2)^- assignment for the ground state of ⁷⁵Rb

[en] Cross sections of the reaction ⁶³Cu(p, 3n)⁶¹Zn(Tsub(1/2) = 1.48 min) have been measured for proton energies from 30 to 47 MeV with an isotope separator on-line (ISOL) attached to a cyclotron. The method of the cross section measurement with the ISOL system has been developed. The cross sections obtained by the ISOL method agreed with those by the stacked foil method. In addition, cross sections of the ⁶³Cu(p, p3n)⁶⁰Cu(Tsub(1/2) = 24 min) reaction have been measured by the stacked foil method at proton energies up to 52 MeV. (author)

[en] Excitation functions for the (p, xn) (x = 3-5), (p, pxn) (x = 1-4) and (p, α3n) reactions on ⁸⁵Rb with 14-70 MeV protons were measured by means of the activation method. Enriched ⁸⁵RbCl targets were irradiated with energy-analyzed protons from the AVF cyclotron at Osaka University. Disintegration rates of product nuclides were obtained from intensities of selected γ-rays with calibrated Ge(Li) detectors. Thick target yields of ⁸¹Rb for medical use and other radioactive products were calculated from measured excitation functions. The calculated thick target yield of ⁸¹Rb was 31,2 mCiμA^-1 h^-1 at Esub(p) = 70 MeV. The thick target yield of ⁸¹Rb chemically separated from ⁸¹Sr, by the reaction ⁸⁵Rb(p, 5n) ⁸¹Sr(β⁺,EC) ⁸¹Rb, was obtained to be 2.3 mCiμA^-1 h^-1 at 96.4 min. (author)

[en] A Monte Carlo code has been developed which predicts electron and positron response functions of a planar intrinsic germanium (Ge) detector. The operational flow chart for the main program is fiven and the function of each subroutine is discussed. The characteristics of the response functions are by considering effects due to bremsstrahlung, annihilation radiation and the total electron transit distance. It is found that electron spectra are distorted primarily near the full energy peak by bremsstrahlung while positron spectra are seriously distorted by both annihilation radiation and bremsstrahlung. Total transit distances calculated here are found to be in good agreement with those calculated using the Bethe-Bloch formula. The effects of bremsstrahlung, annihilation radiation and total stopping distance, calculated independently in the complete code, are then used to construct an abbreviated version which reduces the computer time by a factor of 16. Sample computations are presented for a 16 mm diameter by 7 mm thick, planar detector. The calculated response functions reproduce experimental spectra accurately; they are also used to analyze positron spectra and obtain endpoint energies. (orig.)

[en] A technique for precise determination of beta endpoints with an intrinsic germanium detector has been developed. The energy calibration was derived from γ-ray photopeak measurements. This analysis procedure has been checked with a ²⁷Si source produced in a (p,n) reaction on an ²⁷Al target and subsequently applied to mass separated samples of ⁷⁶Rb, ⁷⁷Rb and ⁷⁸Rb. Results indicate errors < 50 keV are obtainable. (orig.)