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61.
62.
A. Krasznahorkay D. Habs M. Hunyadi D. Gassmann M. Csatlós Y. Eisermann T. Faestermann G. Graw J. Gulyás R. Hertenberger H. J. Maier Z. Máté A. Metz J. Ott P. G. Thirolf S. Y. van der Werf 《Acta Physica Hungarica A》2001,13(1-3):111-120
The 233U(d,pf)234U, and the 235U(d,pf)236U reactions have been studied with high energy resolution. The observed fission resonances were described as members of rotational bands with rotational parameters characteristic of hyperdeformed nuclear shapes. Information on the K values of the bands and for the J values of the band members has been obtained from fission fragment angular distribution measurements. The level density of the most strongly excited states has been compared to the prediction of the back-shifted Fermi-gas formula and the energy of the ground state in the third minimum has been estimated for 234U. The fission fragment mass distribution of the hyperdeformed states in 236U has also been measured. The width of the mass distribution, coincident with the hyperdeformed bands, is significantly smaller than the ones obtained in coincidence with background regions below and above the resonances, which suggests a pear-shaped di-nuclear configuration of 236U in the third well of the potential barrier. 相似文献
63.
M. Block D. Ackermann K. Blaum A. Chaudhuri Z. Di S. Eliseev R. Ferrer D. Habs F. Herfurth F. P. Heßberger S. Hofmann H.-J. Kluge G. Maero A. Martín G. Marx M. Mazzocco M. Mukherjee J. B. Neumayr W. R. Plaß W. Quint S. Rahaman C. Rauth D. Rodríguez C. Scheidenberger L. Schweikhard P. G. Thirolf G. Vorobjev C. Weber 《Hyperfine Interactions》2006,173(1-3):133-142
The Penning-trap mass spectrometer SHIPTRAP was designed for precision mass measurements of radionuclides produced in fusion–evaporation
reactions. The latest measurement campaign covered heavy nuclei (A>90) related to the astrophysical rapid proton capture process. The masses of 34 neutron-deficient radionuclides have been
measured since February 2006 with relative uncertainties between 5×10−8 and 1×10−7. Furthermore, the use of an octupolar RF excitation for the time-of-flight ion-cyclotron-resonance technique was investigated
and an increase of the resolving power by a factor of ten was observed in agreement with simulations. This will allow to resolve
isomeric states with excitation energies of a few 10 keV only.
相似文献
64.
M. Roth A. Blazevic E. Brambrink M. Geissel T. E. Cowan J. Fuchs A. Kemp H. Ruhl P. Audebert J. Cobble J. Fernandez M. Hegelich S. Letzring K. Ledingham P. McKenna R. Clarke D. Neely S. Karsch D. Habs J. Schreiber 《Hyperfine Interactions》2005,162(1-4):45-53
Intense beams of protons and heavy ions have been observed in ultra-intense laser-solid interaction experiments. Thereby,
a considerable fraction of the laser energy is transferred to collimated beams of energetic ions (e.g. up to 50 MeV protons;
100 MeV fluorine), which makes these beams highly interesting for various applications. Experimental results indicate very
short pulse duration and an excellent beam quality, leading to beam intensities in the TW range. To characterize the beam
quality and its dependence on laser parameters and target conditions, we performed experiments at several high-power laser
systems. We found a strong dependence on the target rear surface conditions allowing to tailor the ion beam by an appropriate
target design. We also succeeded in the generation of heavy ion beams by suppressing the proton amount at the target surface.
We will present recent experimental results demonstrating a transverse beam emittance far superior to accelerator-based ion
beams. Finally, we will discuss the prospect of laser-accelerated ion beams as new diagnostics in laser-solid interaction
experiements. Special fields of interest are proton radiography, electric field imaging, and relativistic electron transport
inside the target. 相似文献
65.
H. Backe Th. Blönnigen M. Dahlinger U. Doppler P. Graffé D. Habs M. Hies Ch. Illgner H. Kunz W. Lauth H. Schöpe P. Schwamb W. Theobald R. Zahn 《Hyperfine Interactions》1992,74(1-4):47-57
The feasibility of a hyperfine spectroscopy on242mAm fission isomers has been demonstrated at the low target production rate of 10/s. The experimental method employed is based
on resonance ionization spectroscopy in a buffer gas cell with detection of the ionization process by means of the fission
decay of the isomers. The resonance ionization has been performed in two steps, utilizing an excimer dye laser combination
with a repetition rate of 300 Hz. The first resonant step proceeds through theJ=7/2 term at 21440.35 cm−1, which has been excited with the tuncable dye laser beam of a wavelength of 466.28 nm, the second non-resonant step is achieved
with the 351 nm radiation of the excimer laser itself, running with XeF. The frequency scan of the tuneable dye laser exhibits
a broad resonance ionization signal, the width of which is most likely explained by the magnetic hyperfine interaction. 相似文献
66.
U. Schramm A. Wolf T. Schüß ler D. Habs D. Schwalm O. Uwira J. Linkemann A. Müller 《Hyperfine Interactions》1997,108(1-3):273-281
Spontaneous recombination of highly charged ions with free electrons in merged velocity matched electron and ion beams has
been observed in earlier experiments to occur at rates significantly higher than predicted by theoretical estimates. To study
this enhanced spontaneous recombination, laser induced recombination spectra were measured both in velocity matched beams
and in beams with well defined relative velocities, corresponding to relative electron-ion detuning energies ranging from
1 meV up to 6.5 meV where the spontaneous recombination enhancement was found to be strongly reduced. Based on a comparison
with simplified calculations, the development of the recombination spectra for decreasing detuning energies indicates additional
contributions at matched velocities which could be related to the energy distribution of electrons causing the spontaneous
recombination rate enhancement.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
67.
W. Bonin H. Backe M. Dahlinger S. Glienke D. Habs E. Hanelt E. Kankeleit B. Schwartz 《Zeitschrift für Physik A Hadrons and Nuclei》1985,322(1):59-73
The nuclei218, 220, 222Th were investigated by conversion electron andγ-ray spectroscopy after compound nucleus reactions of14N with209Bi and16, 18O with208Pb. The intenseγ-background from fission was suppressed by spectroscopy of conversion electrons andγ-rays in coincidence with the evaporation residues or theirα-decay. Level schemes were determined for218Th up toI π=10+ and for220Th and222Th up toI π=15?. The observed structure of218Th may be explained in the spherical shell model with residual interaction by two neutron excitation. ForN≧130 completely different level schemes are observed showing very intense, collective electric dipole transitions (B(E1)?10?2 W.u.) with energies of typically 200 keV. Interpretation in terms of stable octupole deformations of the ground state as well as in anα-cluster picture are discussed. 相似文献
68.
Jung D Yin L Albright BJ Gautier DC Hörlein R Kiefer D Henig A Johnson R Letzring S Palaniyappan S Shah R Shimada T Yan XQ Bowers KJ Tajima T Fernández JC Habs D Hegelich BM 《Physical review letters》2011,107(11):115002
Experimental data from the Trident Laser facility is presented showing quasimonoenergetic carbon ions from nm-scaled foil targets with an energy spread of as low as ±15% at 35?MeV. These results and high-resolution kinetic simulations show laser acceleration of quasimonoenergetic ion beams by the generation of ion solitons with circularly polarized laser pulses (500?fs, λ=1054 nm). The conversion efficiency into monoenergetic ions is increased by an order of magnitude compared with previous experimental results, representing an important step towards applications such as ion fast ignition. 相似文献
69.
Rauth C Ackermann D Blaum K Block M Chaudhuri A Di Z Eliseev S Ferrer R Habs D Herfurth F Hessberger FP Hofmann S Kluge HJ Maero G Martín A Marx G Mukherjee M Neumayr JB Plass WR Rahaman S Rodríguez D Scheidenberger C Schweikhard L Thirolf PG Vorobjev G Weber C 《Physical review letters》2008,100(1):012501
The masses of six neutron-deficient rare holmium and thulium isotopes close to the proton drip line were determined with the SHIPTRAP Penning trap mass spectrometer. For the first time the masses of the proton-unbound isotopes 144,145Ho and 147,148Tm were directly measured. The proton separation energies were derived from the measured mass values and compared to predictions from mass formulas. The new values of the proton separation energies are used to determine the location of the proton drip line for holmium and thulium more accurately. 相似文献
70.