Richard T. Kouzes

Nuclear structure of 86,87Rb from 87,88Si(d, 3He) at 28 MeV

Differential cross sections for 87Sr(d, 3He)86Rb and 88Sr(d, 3He)87Rb were measured with the Princeton 27.9 MeV deuteron beam and the quadrupole-dipole-dipole-dipole (QDDD) spectrograph. States of 86Rb and 87Rb up to 1.74 MeV and 1.58 MeV, respectively, were studied with a total resolution of 16keV. Zero-range distorted-wave Born approximation (DWBA) calculations were used to determine l transfers and spectroscopic strengths. If the targets are described as a closed shell for 88Sr and as (vg92)−1 for 87Sr, only the 88Sr(d, 3He)87Rb spectroscopic strengths are close to shell model expectations. The observed 87Sr(d, 3He)86Rb strengths fall 25% below the shell model sum rule. Hence the data suggest that the proton wave functions of 87Sr contain appreciably more configuration mixing than those of 88Sr. Values for the (πf52, vg92) residual interaction matrix elements are proposed, but must remain tentative until the shortfall of f52 strength is understood.

Intrinsic germanium detector efficiency calculations

The efficiency of large high-purity germanium detectors has been studied through Monte Carlo simulation for gamma rays from 0.5 MeV to 20 MeV. Broad-beam and point-source calculations have been carried out for two high-purity germanium detectors. The significant effects of geometric details are described, and a comparison of the Monte Carlo calculations to measurements is given. The comparison shows the need to include geometrical detail in calculations of detector efficiency. >

The Princeton Cyclotron Data Acquisition System

The Princeton Cyclotron minicomputer based data acquisition system is used for nuclear physics research. The system includes eight 13-bit resolution ADCs, computer readable scalers and a general analog and digital I/O crate interfaced to a Data General Eclipse S/230 with 80K words of memory running under the RDOS operating system. The acquisition program ACQUIRE is a general multiparameter sorting and analysis code capable of high data rates (40 kHz without loss for a repetitious pulser).

Data General 32 Bit Computer Based Aquisition System at the Princeton University Cyclotron

A new data acquisition and analysis system based on Data General MV/10000 and MV/4000 32 bit minicomputers is being developed at Princeton. The CAMAC based system uses a Bi-Ra interface controlled by the data acquisition program ACQUIRE. The MV/4000 acquisition computer is tied via Ethernet to the MV/10000 analysis computer.

The 249Bk(p, t)247Bk reaction

Abstract The 249 Bk(p, t) 247 Bk reaction was performed with a 15 MeV proton beam from the Princeton University AVF cyclotron. The outgoing tritons were magnetically analyzed by a QDDD spectrometer. A DWBA analysis was performed, and a good L = 0 angular distribution was observed populating the 7 2 + [633] bandhead in 247 Bk. Levels up to the 15 2 member of this rotational band were populated at 41, 84, 137, 196 and 265 keV. No other peaks were observed. The absence of strength in the 5 2 + [642] band is shown to be consistent with the degree of mixing expected from calculation of the Coriolis interaction. The ground state of 249 Bk is discussed in terms of the gap in the neutron Nilsson levels at N = 152.

An Application of Microprogramming to Nuclear Physics Data Acquisition

The data acquisition system for the Princeton Cyclotron has been improved by implementing critical processes in Data General microcode. The count rate improvement for the affected sort modes is over 200%.

Proportional counter response calculations for gallium solar neutrino detectors

Gallium-based solar neutrino detectors are sensitive to the primary pp reaction in the Sun. Two experiments using gallium, SAGE in the Soviet Union and GALLEX in Europe, are under construction and are scheduled to produce data by 1989. The radioactive /sup 71/Ge produced by neutrinos interacting with the gallium detector material is chemically extracted and counted in miniature proportional counters. A number of calculation have been carried out to simulate the response of these counters to the decay of /sup 71/Ge and to background events. It is shown that the use of xenon gas clearly improves the detector efficiency relative to argon in the 10-keV energy range from 35% to 53%. It appears that the disadvantage of increased conversion efficiency for background gammas in xenon is not relevant, due to the dominance of the conversion of gammas in the glass walls of the detector. >

IBM/RT Based CAMAC Data Acquisition Station

An IBM/RT based data acquisition station is under development at the Princeton University Cyclotron Laboratory in cooperation with an IBM academic donation program. Our multiparameter data acquisition software ACQUIRE is being implemented on the RT. A Turbo Pascal data-taking code which executes on the AT co-processor was first transferred to the RT system and is being used in experiments. A number of other useful programs, including our kinematics codes, have also been transferred to the RT.

Proposed Nuclear and High Energy Physics Standard Tape Format for the Exchange of Data between Laboratories

The IEEE Computer Applications in Nuclear and Plasma Sciences Technical Committee (CANPS), the organizers of this conference, have prepared a proposed standard format for the exchange of magnetic tapes containing experimental data. We include the description of the proposed standard here to elicit response from the community of professionals most likely to be involved in implementing data tape formats. Please send us your comments, suggestions and criticisms.

Apple-CAMAC Data Acquisition Systems

Apple microcomputers have been combined with CAMAC to produce data acquisition systems used for a variety of applications at the Princeton Cyclotron Laboratory. Two specific implementations are discussed: a general one or two parameter MCA system and a specific eleven parameter system. A multiplicity of off-line experiments led to the need for these systems having data manipulation and control ability beyond that of low cost systems available commercially. A serial communications port allows for data transfer to our main computer for more complete analysis.