Klaus Spohr

Dr. Klaus Spohr

Extreme Light Infrastructure, ELI-NP, Bucharest, Romania
orcid

Research Focus & Metrics

Academic Career Length

34Years (1993-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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25 June 2001 in Physical Review Letters
Verified
Journal Article
Closed access
PDF file
SØS. W. Ødegård
S. W. Ødegård
GHG. B. Hagemann
G. B. Hagemann
DJD. R. Jensen
D. R. Jensen
MBM. Bergström
M. Bergström
BHB. Herskind
B. Herskind
DCD. Curien
D. Curien
The nucleus 163Lu has been populated through the fusion-evaporation reaction 139La(29Si,5n)163Lu with a beam energy of 152 MeV. The electromagnetic properties of several connecting transitions between two presumably triaxial, strongly deformed (TSD) bands have been studied. Evidence is presented for the assignment of the excited TSD band as a wobbling mode built on the yrast TSD band, based on comparisons to new calculations in which an aligned particle is coupled to a strongly deformed triaxial rotor. The wobbling mode is uniquely related to triaxiality in nuclei.

1 March 2020 in Matter and Radiation at Extremes
Verified
Journal Article
Open access
PDF file
KTK. A. Tanaka
K. A. Tanaka
Klaus SpohrKlaus Spohr
Klaus Spohr
DBDimiter L. Balabanski
Dimiter L. Balabanski
SBS. Balascuta
S. Balascuta
LCL. Capponi
L. Capponi
NZN. V. Zamfir
N. V. Zamfir
The emergence of a new era reaching beyond current state-of-the-art ultrashort and ultraintense laser technology has been enabled by the approval of around € 850 million worth of structural funds in 2011–2012 by the European Commission for the installation of Extreme Light Infrastructure (ELI). The ELI project consists of three pillars being built in the Czech Republic, Hungary, and Romania. This challenging proposal is based on recent technical progress allowing ultraintense laser fields in which intensities will soon be reaching as high as I0 ∼ 1023 W cm−2. This tremendous technological advance has been brought about by the invention of chirped pulse amplification by Mourou and Strickland. Romania is hosting the ELI for Nuclear Physics (ELI-NP) pillar in Măgurele near Bucharest. The new facility, currently under construction, is intended to serve the broad national, European, and international scientific community. Its mission covers scientific research at the frontier of knowledge involving two domains. The first is laser-driven experiments related to NP, strong-field quantum electrodynamics, and associated vacuum effects. The second research domain is based on the establishment of a Compton-backscattering-based, high-brilliance, and intense γ beam with Eγ ≲ 19.5 MeV, which represents a merger between laser and accelerator technology. This system will allow the investigation of the nuclear structure of selected isotopes and nuclear reactions of relevance, for example, to astrophysics with hitherto unprecedented resolution and accuracy. In addition to fundamental themes, a large number of applications with significant societal impact will be developed. The implementation of the project started in January 2013 and is spearheaded by the ELI-NP/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH). Experiments will begin in early 2020.

1 January 2003 in Physics Letters B
Verified
Journal Article
Closed access
GSG Schönwaßer
G Schönwaßer
HHH Hübel
H Hübel
GHG.B Hagemann
G.B Hagemann
PBP Bednarczyk
P Bednarczyk
GBG Benzoni
G Benzoni
ASA.K Singh
A.K Singh

16 September 2002 in Physical Review Letters
Verified
Journal Article
Closed access
PDF file
DJD. R. Jensen
D. R. Jensen
GHG. B. Hagemann
G. B. Hagemann
IHI. Hamamoto
I. Hamamoto
SØS. W. Ødegård
S. W. Ødegård
BHB. Herskind
B. Herskind
DCD. Curien
D. Curien
The nucleus L163u has been populated through the reaction L139a(S29i,5n) with a beam energy of 157 MeV. Three triaxial, strongly deformed (TSD) bands have been observed with very similar rotational properties. The first excited TSD band has earlier been assigned as a one-phonon wobbling excitation built on the lowest-lying (yrast) TSD band. The large B(E2)out/B(E2)in value obtainable for one of four observed transitions between the second and first excited TSD bands is in good agreement with particle-rotor calculations for a two-phonon wobbling excitation.

21 September 2004 in Physical Review E
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Journal Article
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PMPaul McKenna
Paul McKenna
KLK. W. D. Ledingham
K. W. D. Ledingham
JYJ. M. Yang
J. M. Yang
LRL. Robson
L. Robson
TMT. McCanny
T. McCanny
PNP. A. Norreys
P. A. Norreys
Proton and heavy ion acceleration in ultrahigh intensity (∼2×1020Wcm−2) laser plasma interactions has been investigated using the new petawatt arm of the VULCAN laser. Nuclear activation techniques have been applied to make the first spatially integrated measurements of both proton and heavy ion acceleration from the same laser shots with heated and unheated Fe foil targets. Fe ions with energies greater than 10MeV per nucleon have been observed. Effects of target heating on the accelerated ion energy spectra and the laser-to-ion energy conversion efficiencies are discussed. The laser-driven production of the long-lived isotope Co57 (271 days) via a heavy ion induced reaction is demonstrated.

1 February 2001 in Nuclear Physics A
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Journal Article
Closed access
JWJ.S. Winfield
J.S. Winfield
SFS. Fortier
S. Fortier
WCW.N. Catford
W.N. Catford
SPS. Pita
S. Pita
NON.A. Orr
N.A. Orr
AVA. de Vismes
A. de Vismes