PROGRESS REPORT FOR JULY, AUGUST, SEPTEMBER 1959 TO THE UNITED STATES ATOMIC ENERGY COMMISSION
Neutron data were obtained for Th, Au, and Nb in the energy region below a few kev. Transmission measurements employing the B/sup 10/-Nal fiat detector were carried out for all three materials. Self-detection capture gamma ray data were taken for Au and Nb. Several additions and modifications were made to the velocity selector spectrometer. A gas scintillation counter combining He/sup 3/ and Xe was tested. For the precision measurement of the (n,p) cross section, advanoes were made by using electrostatic lenses to focus the Van de Granff beam. The absolute value of the total neutron cross section of U/sup 235/ was measured for neutrons of energies between 0.00818 and 0.0818 ev. The installation and testing of the automatic arm advance mechanism were completed. Preliminary measurements of the subthermal neutron cross section of powdered MaF/sub /2, MnO, and ZnF/sub 2/ were completed. An external beam of approximately 10 mu a of 13 Mev protons was obtained from the exit valve window of the cyclotron chamber. Angular distributions were obtained for the reaction F/sup 19/(d,n)Ne/sup 20/. The search for the reported 1.47 Mev level in Na/sup 21/ from the Ne/sup 20/(p, gamma )reaction was continued. The study of the relative strengths of the 0/sup +/ yields 0/sup +/ decay modes through double gamma transition, pair production, and internal conversion was extended to Zr/sup 90/ and Ge/sup 72/ A new resonance was observed in the reaction C/sup 12/(p p gamma ). The He/sup 3/ beam of energies between 2.5 and 3.5 Mev was put into operation. The double focusing magnetic spectrometer is being used for study of the inelastic proton scattering on Mg/sup 5/. A general formula for the muon capture reaction and the transition rate for the forbidden tramsition were calculated. Instrument development is summarized. The investigation of the v/c dependence in beta - gamma correlation was completed. For the He/sup 6/ beta-neutrino angular correlation experiment, two different, well-type "Pilot-B" scintillation spectrometers were designed, constructed, and tested. In connection with the program of measurement of short life-times of excited nuclear states, a fast coincidence spectrometer was developed. (For preceding period see CU-194.) (W.D.M.)
- Research Organization:
- Columbia Univ., New York. Pegram Nuclear Physics Labs.
- DOE Contract Number:
- AT-30-1-GEN-72
- NSA Number:
- NSA-14-016068
- OSTI ID:
- 4183495
- Report Number(s):
- CU(PNPL)-199
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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