26
|
Stefanescu I, Georgiev G, Ames F, Aystö J, Balabanski DL, Bollen G, Butler PA, Cederkäll J, Champault N, Davinson T, De Maesschalck A, Delahaye P, Eberth J, Fedorov D, Fedosseev VN, Fraile LM, Franchoo S, Gladnishki K, Habs D, Heyde K, Huyse M, Ivanov O, Iwanicki J, Jolie J, Jonson B, Kröll T, Krücken R, Kester O, Köster U, Lagoyannis A, Liljeby L, Lo Bianco G, Marsh BA, Niedermaier O, Nilsson T, Oinonen M, Pascovici G, Reiter P, Saltarelli A, Scheit H, Schwalm D, Sieber T, Smirnova N, Van De Walle J, Van Duppen P, Zemlyanoi S, Warr N, Weisshaar D, Wenander F. Coulomb excitation of 68,70Cu: first use of postaccelerated isomeric beams. PHYSICAL REVIEW LETTERS 2007; 98:122701. [PMID: 17501116 DOI: 10.1103/physrevlett.98.122701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2006] [Indexed: 05/15/2023]
Abstract
We report on the first low-energy Coulomb excitation measurements with radioactive Ipi=6- beams of odd-odd nuclei 68,70Cu. The beams were produced at ISOLDE, CERN and were post-accelerated by REX-ISOLDE to 2.83 MeV/nucleon. Gamma rays were detected with the MINIBALL spectrometer. The 6- beam was used to study the multiplet of states (3-, 4-, 5-, 6-) arising from the pi2p3/2 nu 1g9/2 configuration. The 4- state of the multiplet was populated via Coulomb excitation and the B(E2;6--->4-) value was determined in both nuclei. The results obtained illustrate the fragile stability of the Z=28 shell and N=40 subshell closures. A comparison with large-scale shell-model calculations using the 56Ni core shows the importance of the proton excitations across the Z=28 shell gap to the understanding of the nuclear structure in the neutron-rich nuclei with N approximately 40.
Collapse
|
27
|
Schreiber J, Bell F, Grüner F, Schramm U, Geissler M, Schnürer M, Ter-Avetisyan S, Hegelich BM, Cobble J, Brambrink E, Fuchs J, Audebert P, Habs D. Analytical model for ion acceleration by high-intensity laser pulses. PHYSICAL REVIEW LETTERS 2006; 97:045005. [PMID: 16907584 DOI: 10.1103/physrevlett.97.045005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Indexed: 05/11/2023]
Abstract
We present a general expression for the maximum ion energy observed in experiments with thin foils irradiated by high-intensity laser pulses. The analytical model is based on a radially confined surface charge set up by laser accelerated electrons on the target rear side. The only input parameters are the properties of the laser pulse and the target thickness. The predicted maximum ion energy and the optimal laser pulse duration are supported by dedicated experiments for a broad range of different ions.
Collapse
|
28
|
Niedermaier O, Scheit H, Bildstein V, Boie H, Fitting J, von Hahn R, Köck F, Lauer M, Pal UK, Podlech H, Repnow R, Schwalm D, Alvarez C, Ames F, Bollen G, Emhofer S, Habs D, Kester O, Lutter R, Rudolph K, Pasini M, Thirolf PG, Wolf BH, Eberth J, Gersch G, Hess H, Reiter P, Thelen O, Warr N, Weisshaar D, Aksouh F, Van den Bergh P, Van Duppen P, Huyse M, Ivanov O, Mayet P, Van de Walle J, Aystö J, Butler PA, Cederkäll J, Delahaye P, Fynbo HOU, Fraile LM, Forstner O, Franchoo S, Köster U, Nilsson T, Oinonen M, Sieber T, Wenander F, Pantea M, Richter A, Schrieder G, Simon H, Behrens T, Gernhäuser R, Kröll T, Krücken R, Münch M, Davinson T, Gerl J, Huber G, Hurst A, Iwanicki J, Jonson B, Lieb P, Liljeby L, Schempp A, Scherillo A, Schmidt P, Walter G. "Safe" Coulomb excitation of 30Mg. PHYSICAL REVIEW LETTERS 2005; 94:172501. [PMID: 15904283 DOI: 10.1103/physrevlett.94.172501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2004] [Indexed: 05/02/2023]
Abstract
We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together with a thin (nat)Ni target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation gamma-ray yields the B(E2;0(+)gs-->2(+)1) value of 30Mg was determined to be 241(31)e2 fm4. Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope 30Mg resides outside the "island of inversion."
Collapse
|
29
|
Habs D. The Munich Accelerator for Fission Fragments MAFF. ACTA ACUST UNITED AC 2005. [DOI: 10.1063/1.2140620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
30
|
Habs D. Design Considerations for Converting Laser-Accelerated Electron Beams into Brilliant X-Ray, γ-Ray and Neutron-Beams. ACTA ACUST UNITED AC 2005. [DOI: 10.1063/1.2140617] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
31
|
Karsch S, Düsterer S, Schwoerer H, Ewald F, Habs D, Hegelich M, Pretzler G, Pukhov A, Witte K, Sauerbrey R. High-intensity laser induced ion acceleration from heavy-water droplets. PHYSICAL REVIEW LETTERS 2003; 91:015001. [PMID: 12906545 DOI: 10.1103/physrevlett.91.015001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2002] [Indexed: 05/24/2023]
Abstract
Fusion neutrons from a heavy water droplet target irradiated with laser pulses of 3 x 10(19) W/cm(2) and from a deuterated secondary target are observed by a time-of-flight (TOF) neutron spectrometer. The observed TOF spectrum can be explained by fusion of deuterium ions simultaneously originating from two different sources: ion acceleration in the laser focus by ponderomotively induced charge separation and target-normal sheath acceleration off the target rear surface. The experimental findings agree well with 3D particle-in-cell simulations.
Collapse
|
32
|
Schramm U, Schätz T, Habs D. Three-dimensional crystalline ion beams. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 66:036501. [PMID: 12366271 DOI: 10.1103/physreve.66.036501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2001] [Indexed: 05/23/2023]
Abstract
We report on the experimental realization of two- and three-dimensional crystalline ion beams in the rf quadrupole storage ring PALLAS (LMU, Munich). At a beam energy around 1 eV the phase transition to the Coulomb ordered state is identified by a sudden decrease of the spatial width and of the velocity spread of the beam. The focusing conditions required to attain crystalline beams up to structures of helices surrounding a string are systematically investigated and related to the situation in typical heavy ion storage rings.
Collapse
|
33
|
Hegelich M, Karsch S, Pretzler G, Habs D, Witte K, Guenther W, Allen M, Blazevic A, Fuchs J, Gauthier JC, Geissel M, Audebert P, Cowan T, Roth M. MeV ion jets from short-pulse-laser interaction with thin foils. PHYSICAL REVIEW LETTERS 2002; 89:085002. [PMID: 12190475 DOI: 10.1103/physrevlett.89.085002] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2001] [Indexed: 05/23/2023]
Abstract
Collimated jets of carbon and fluorine ions up to 5 MeV/nucleon ( approximately 100 MeV) are observed from the rear surface of thin foils irradiated with laser intensities of up to 5 x 10 (19)W/cm(2). The normally dominant proton acceleration could be surpressed by removing the hydrocarbon contaminants by resistive heating. This inhibits screening effects and permits effective energy transfer and acceleration of other ion species. The acceleration dynamics and the spatiotemporal distributions of the accelerating E fields at the rear surface of the target are inferred from the detailed spectra.
Collapse
|
34
|
Abstract
By freezing out the motion between particles in a high-energy storage ring, it should be possible to create threads of ions, offering research opportunities beyond the realm of standard accelerator physics. The usual heating due to intra-beam collisions should completely vanish, giving rise to a state of unprecedented brilliance. Despite a continuous improvement of beam cooling techniques, such as electron cooling and laser cooling, the ultimate goal of beam crystallization has not yet been reached in high-energy storage rings. Electron-cooled dilute beams of highly charged ions show liquid-like order with unique applications. An experiment using laser cooling suggested a reduction of intra-beam heating, although the results were ambiguous. Here we demonstrate the crystallization of laser-cooled Mg+ beams circulating in the radiofrequency quadrupole storage ring PALLAS at a velocity of 2,800 m s-1, which corresponds to a beam energy of 1 eV. A sudden collapse of the transverse beam size and the low longitudinal velocity spread clearly indicate the phase transition. The continuous ring-shaped crystalline beam shows exceptional stability, surviving for more than 3,000 revolutions without cooling.
Collapse
|
35
|
Thirolf PG, van der Werf SY, Ott J, Máté Z, Gulyás J, Csatlós M, Hunyadi M, Krasznahorkay A, Faestermann T, Metz A, Maier HJ, Hertenberger R, Graw G, Eisermann Y, Habs D, Gassmann D. Hyperdeformation and Clusterization in the Actinide Region. ACTA ACUST UNITED AC 2001. [DOI: 10.1556/aph.13.2001.1-3.12] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
36
|
Schramm U, Schüssler T, Habs D, Schwalm D, Wolf A. Laser-induced recombination studies with the adiabatically expanded electron beam of the Heidelberg TSR. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf02274935] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
37
|
Amitay Z, Zajfman D, Forck P, Hechtfischer U, Seidel B, Grieser M, Habs D, Repnow R, Schwalm D, Wolf A. Dissociative recombination of CH+: Cross section and final states. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 54:4032-4050. [PMID: 9913951 DOI: 10.1103/physreva.54.4032] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
38
|
Miesner H, Grimm R, Grieser M, Habs D, Schwalm D, Wanner B, Wolf A. Efficient, Indirect Transverse Laser Cooling of a Fast Stored Ion Beam. PHYSICAL REVIEW LETTERS 1996; 77:623-626. [PMID: 10062861 DOI: 10.1103/physrevlett.77.623] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
39
|
Lampert A, Wolf A, Habs D, Kenntner J, Kilgus G, Schwalm D, Pindzola MS, Badnell NR. High-resolution measurement of the dielectronic recombination of fluorinelike selenium ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:1413-1423. [PMID: 9913031 DOI: 10.1103/physreva.53.1413] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
40
|
Amitay Z, Zajfman D, Forck P, Heupel T, Grieser M, Habs D, Repnow R, Schwalm D, Wolf A, Guberman SL. Dissociative recombination of cold OH+: Evidence for indirect recombination through excited core Rydberg states. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:R644-R647. [PMID: 9913007 DOI: 10.1103/physreva.53.r644] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
41
|
Schüssler T, Schramm U, Rüter T, Broude C, Grieser M, Habs D, Schwalm D, Wolf A. Laser-stimulated recombination spectroscopy for the study of long-range interactions in highly charged Rydberg ions. PHYSICAL REVIEW LETTERS 1995; 75:802-805. [PMID: 10060122 DOI: 10.1103/physrevlett.75.802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
42
|
Zajfman D, Amitay Z, Broude C, Forck P, Seidel B, Grieser M, Habs D, Schwalm D, Wolf A. Measurement of branching ratios for the dissociative recombination of cold HD+ using fragment imaging. PHYSICAL REVIEW LETTERS 1995; 75:814-817. [PMID: 10060125 DOI: 10.1103/physrevlett.75.814] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
43
|
Linkemann J, Müller A, Kenntner J, Habs D, Schwalm D, Wolf A, Badnell NR, Pindzola MS. Electron-impact ionization of Fe15+ ions: An ion storage ring cross section measurement. PHYSICAL REVIEW LETTERS 1995; 74:4173-4176. [PMID: 10058434 DOI: 10.1103/physrevlett.74.4173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
44
|
Forck P, Broude C, Grieser M, Habs D, Kenntner J, Liebmann J, Repnow R, Schwalm D, Wolf A, Amitay Z, Zajfman D. New resonances in the dissociative recombination of vibrationally cold CD+. PHYSICAL REVIEW LETTERS 1994; 72:2002-2005. [PMID: 10055763 DOI: 10.1103/physrevlett.72.2002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
45
|
Schmidt HT, Forck P, Grieser M, Habs D, Kenntner J, Miersch G, Repnow R, Schramm U, Schüssler T, Schwalm D, Wolf A. High-precision measurement of the magnetic-dipole decay rate of metastable heliumlike carbon ions in a storage ring. PHYSICAL REVIEW LETTERS 1994; 72:1616-1619. [PMID: 10055657 DOI: 10.1103/physrevlett.72.1616] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
46
|
Meltzow B, Warburton EK, Ender C, Gerl J, Habs D, Lauff U, Schirmer J, Schwalm D, Thirolf P. Measurement and significance of Gamma gamma / Gamma for the 7117-keV 4(+) level of 18O. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1994; 49:743-749. [PMID: 9969280 DOI: 10.1103/physrevc.49.743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
47
|
Petrich W, Grieser M, Grimm R, Gruber A, Habs D, Miesner H, Schwalm D, Wanner B, Wernoe H, Wolf A, Grieser R, Huber G, Klein R, Kühl T, Neumann R, Schröder S. Laser cooling of stored high-velocity ions by means of the spontaneous force. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:2127-2144. [PMID: 9909834 DOI: 10.1103/physreva.48.2127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
48
|
Kilgus G, Habs D, Schwalm D, Wolf A, Schuch R, Badnell NR. Dielectronic recombination from the ground state of heliumlike carbon ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:4859-4864. [PMID: 9909516 DOI: 10.1103/physreva.47.4859] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
49
|
Forck P, Grieser M, Habs D, Lampert A, Repnow R, Schwalm D, Wolf A, Zajfman D. Dissociative recombination of cold HD+ at the Test Storage Ring. PHYSICAL REVIEW LETTERS 1993; 70:426-429. [PMID: 10054109 DOI: 10.1103/physrevlett.70.426] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
50
|
Wolf A, Habs D, Lampert A, Neumann R, Schramm U, Schüssler T, Schwalm D. Electron-ion recombination in merged beams. ACTA ACUST UNITED AC 1993. [DOI: 10.1063/1.43775] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|