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61.
The R-matrix method is used to calculate the total photoionization cross-sections from the ground 2s
22p
6
1
S
e and the first three excited 2s
22p
53p
3,1
S
e states of Al IV, for photon energies ranging from the first ionization threshold to just above the second threshold of the
residual ion Al V. The two lowest LS terms of Al V − 2s
22p
5
2
P
0, 2s2p
6
2
S
e, 2s2p
6
2
S
e, represented by sophisticated configuration interaction wavefunctions, are included in the R-matrix calculation. The resulting cross-sections are affected by Rydberg series of resonances converging to the 2s2p
6
2
S
e excited threshold. 相似文献
62.
63.
M. Block D. Ackermann K. Blaum C. Droese M. Dworschak M. Eibach S. Eliseev T. Fleckenstein E. Haettner F. Herfurth F. P. He?berger S. Hofmann J. Ketelaer J. Ketter H. -J. Kluge G. Marx M. Mazzocco Yu. N. Novikov W. R. Pla? A. Popeko S. Rahaman D. Rodríguez C. Scheidenberger L. Schweikhard P. G. Thirolf G. K. Vorobyev C. Weber 《Hyperfine Interactions》2010,196(1-3):225-231
Penning traps are widely used for high-precision mass measurements of radionuclides related to nuclear astrophysics studies and the evolution of nuclear structure far away from stability. With the stopping of secondary beams in gas cells together with advanced ion-beam manipulation techniques their reach has been extended to rare isotopes of essentially all elements. The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt has recently demonstrated that even high-precision mass measurements of transfermium elements can be performed despite low production rates of only about one particle per second. This important milestone opens new perspectives for the study of superheavy elements with ion traps. 相似文献
64.
D. Habs T. Tajima J. Schreiber C. P.J. Barty M. Fujiwara P. G. Thirolf 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,55(2):279-285
A laser-accelerated dense electron sheet with an energy \(E=\tilde{\gamma} mc^2\) can be used as a relativistic mirror to coherently reflect a second laser with photon energy ?ω, thus generating by the Doppler boost [A. Einstein, Annalen der Physik 17, 891 (1905); D. Habs et al., Appl. Phys. B 93, 349 (2008)] brilliant high-energy photon beams with \(\hbar\omega^{\prime}=4\tilde{\gamma}^2\hbar\omega\) and short duration for many new nuclear physics experiments.While the shortest-lived atomic levels are in the atto-second range, nuclear levels can have lifetimes down to zeptoseconds. We discuss how the modulation of electron energies in phase-locked laser fields used for as-measurements [E. Goulielmakis et al., Science 317, 769 (2007)] can be carried over to the new direct measurement of fs–zs nuclear lifetimes by modulating the energies of accompanying conversion electrons or emitted protons. In the field of nuclear spectroscopy we discuss the new perspective as a function of increasing photon energy. In nuclear systems a much higher sensitivity is predicted to the timevariation of fundamental constants compared to atomic systems [V. Flambaum, arXiv:nucl-th/0801.1994v1 (2008)]. For energies up to 50 keV Mössbauer-like recoilless absorption allows to produce nuclear bosonic ensembles with many delocalized coherent polaritons [G.V. Smirnov et al., Phys. Rev. A 71, 023804 (2005)] for the firsttime. Using the (γ,n) reaction to produce cold, polarized neutrons with a focusing ellipsoidal device [P. Böni, Nucl. Instrum. Meth. A 586, 1 (2008); Ch. Schanzer et al., Nucl. Instrum. Meth. 529, 63 (2004)], brilliant cold polarized micro-neutron beams become available. The compact and relatively cheap laser-generated γ beams may serve forextended studies at university-based facilities. 相似文献
65.
66.
van Dongen PG 《Physical review letters》1989,63(12):1281-1284
67.
68.
69.
Haettner E Ackermann D Audi G Blaum K Block M Eliseev S Fleckenstein T Herfurth F Hessberger FP Hofmann S Ketelaer J Ketter J Kluge HJ Marx G Mazzocco M Novikov YN Plass WR Rahaman S Rauscher T Rodríguez D Schatz H Scheidenberger C Schweikhard L Sun B Thirolf PG Vorobjev G Wang M Weber C 《Physical review letters》2011,106(12):122501
The masses of ten proton-rich nuclides, including the N=Z+1 nuclides ??Mo and ??Tc, were measured with the Penning trap mass spectrometer SHIPTRAP. Compared to the Atomic Mass Evaluation 2003 a systematic shift of the mass surface by up to 1.6 MeV is observed causing significant abundance changes of the ashes of astrophysical x-ray bursts. Surprisingly low α separation energies for neutron-deficient Mo and Tc are found, making the formation of a ZrNb cycle in the rp process possible. Such a cycle would impose an upper temperature limit for the synthesis of elements beyond Nb in the rp process. 相似文献
70.
Helane?MS?Costa Augusto?CV?Freitas Júnior Ian?PG?Amaral Izaura?Y?Hirata Patrícia?MG?Paiva Luiz?B?CarvalhoJr Vitor?Oliveira Ranilson?S?BezerraEmail author 《Chemistry Central journal》2013,7(1):166