Search results for "nuclear physics"

Pion photoproduction on3He including final-state interaction

1991

Coherent π0 and π+ photoproduction and elastic and charge-exchange pion scattering on3He has ben calculated in a consistent model. Realistic three-body Faddeev wave functions have been used and full nonlocal DWIA results for pion photoproduction are obtained. Furthermore, two-step processes such as3He(γ, π0)3He(π0, π+)3H are included giving rise to unexpected large results. The comparison with experimental data is very good over a wide range of photon energies and nuclear momentum transfers. A long-time discrepancy between previous impulse-approximation calculations and experimental data has been removed.

Quantized ATDHF: theory and realistic applications to heavy ion fusion

1982

The quantized ATDHF theory is reviewed and discussed in the context of the generator coordinate method. This allows for a derivation which does not require an a posteriori quantization process. The ATDHF equations are then solved numerically on a coordinate and momentum grid in fully three dimensional geometry. The theory is applied to various heavy ion systems, where potentials, mass parameters and quantum corrections are evaluated and compared to conventional results from constrained Hartree-Fock. Subbarrier fusion cross sections are calculated and compared with experiment.

Inclusive Pion Double Charge Exchange on Light Nuclei above 0.5 GeV

1995

Inclusive double charge exchange (DCX) reaction A(π −, π +) X on 6Li and 16O was for the first time measured at incident kinetic energy T 0 = 1.1 GeV ( ≈ 5°) for outgoing particle momentum region where additional pion production is kinematically forbidden. The experiment was performed at secondary π − beam of the ITEP proton synchrotron using the 3m magnet spectrometer. The measured double differential cross section at 1.1 GeV together with our previous results at 0.6 and 0.75 GeV [1] and with the lower energy data [2] and [3] shows rather slow decrease with energy. This result is in contradiction with the fast fall of small angle DCX cross section calculated [4] in the standard mechanism o…

Studying of Nickel Alloys with 1 at.% of Ge, Zn, In, Zr and Pb by Positron Annihilation Methods

2001

The discovery of nuclear fission 50 years ago a few remarks

1990

Abstract  A historical account on the details of the discovery of nuclear fission in 1939 is given.

Collinear fast atomic-beam laser spectroscopy at riken garis/igisol

1992

We have constructed a fast atomic-beam collinear laser spectroscopy system connected to the on-line isotope separator facility GARIS/IGISOL at RIKEN. This system is potentially powerful in studying refractory elements. To test the system, an off-line collinear experiment was made on stable Hf isotopes produced by means of laser ablation technique. For production of radioactive Hf isotopes, the use of the inverse kinematics of a fusion reaction,9Be(166Er,xn)175-xHf, was investigated. The radioactive isotope169Hf was successfully extracted from GARIS/IGISOL and accelerated up to 30 keV.

Stopping powers of havar and effective charge for 1.4–3.2 MeV/u 127I-ions

2000

Abstract Stopping powers of havar for 1.4–3.2 MeV/u 127 I-ions have been determined by the transmission technique using two geometrical arrangements. No previous data have been published for havar with this ion. The experimental data are compared with predictions obtained by using Bragg’s additivity rule with various parametrizations of the stopping power found in the literature. The values obtained by the parametrizations underestimate the experimental data by 5–11%. The empirical correction scheme of Thwaites yields values in rather good agreement with the present results, especially at energies above 1.9 MeV/u. The effective charges of the 127 I ions were also deduced from the experiment…

Stopping powers of havar for 1.6, 2.3 and 3.2 MeV/u heavy ions

2000

Abstract Stopping powers of havar for 28,30 Si-, 36 Ar-, 54,56 Fe- and 80,84 Kr-ions with energies of 1.6, 2.3 and 3.2 MeV/u have been determined by a transmission technique. Sample foils are exposed to the direct beams. No previous data for havar with these ions have been published. The obtained results are brought together with literature havar data for 1 H-, 4 He-, 7 Li-, 11 B-, 12 C-, 14 N-, 16 O- and 127 I-ions at the same ion velocity. The experimental data are compared with the values predicted by the SRIM-2000 parametrization using Bragg’s rule. A systematic underestimation, by 6–23%, of the experimental stopping powers was observed. The empirical correction scheme of Thwaites has b…

Laser spectroscopy — Recent results and prospects for lighter nuclei

1992

Atomic physics methods have provided important information about the electromagnetic properties of the nuclear ground states. In recent years the experimental effort has been directed towards optical high resolution spectroscopy of very high sensitivity, giving access to short-lived nuclides very far from stability. A few of these new techniques based on collinear laser spectroscopy are presented with their latest results. They are suitable for an extension of the experiments to the region of lighter nuclei.

Energy loss of 132Xe-ions in thin foils

2009

Abstract The energy loss of 132Xe-ions in C, Al, Ni, Ag, Lu, Au, Pb and Th foils was measured in the energy range from 0.1 to 5 MeV/u using the TOF-E method. The results are compared with previously published data and with the predictions of several computer codes. They include theoretical codes: PASS, CASP, semi-empirical programs: SRIM, LET and the Hubert table predictions.