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31.
Wilson AN Singh AK Hübel H Davidson PM Görgen A Rossbach D Korichi A Astier A Azaiez F Bazzacco D Bourgeois C Buforn N Byrne AP Dracoulis GD Hannachi F Hauschild K Korten W Kröll T Lane GJ Lopez-Martens A Redon N Reiter P Rossi-Alvarez C Schonwasser G Stezowski O Thirolf PG 《Physical review letters》2005,95(18):182501
The excitation energy of the lowest-energy superdeformed band in 196Pb is established using the techniques of time-correlated gamma-ray spectroscopy. Together with previous measurements on 192Pb and 194Pb, this result allows superdeformed excitation energies, binding energies, and two-proton and two-neutron separation energies to be studied systematically, providing stringent tests for current nuclear models. The results are examined for evidence of a "superdeformed shell gap." 相似文献
32.
P. G. Thirolf D. Gassmann D. Habs M. Hunyadi A. Krasznahorkay E. Mergel H. Hübel D. Pansegrau D. Schwalm M. J. Chromik M. Csatlós J. Domscheit Y. Eisermann T. Faestermann G. Graw A. Görgen J. Gulyás K. Hauschild R. Hertenberger T. Härtlein F. Köck A. Lopez-Martens Z. Maté H. J. Maier A. Metz S. Neumann A. Neusser P. Reiter G. Schönwasser H. Scheit 《Acta Physica Hungarica A》2003,18(2-4):317-322
Progress in the experimental techniques used to investigate superdeformed fission isomers in the actinides allowed for detailed spectroscopic results of collective properties as well as for the identification of the rotational structure of multiphonon vibrational excitations. A novel approach could be established to determine the depth of the second potential well. 相似文献
33.
T. Faestermann R. Schneider A. Stolz K. Sümmerer E. Wefers J. Friese H. Geissel M. Hellström P. Kienle H.-J. Körner M. Mineva M. Münch G. Münzenberg C. Schlegel K. Schmidt P. Thirolf H. Weick K. Zeitelhack 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):185-188
Neutron deficient nuclei near 100Sn have been produced by fragmentation of a 1 .
AGeV 112Sn beam. The fragments were separated, identified and stopped in a highly segmented silicon strip detector stack. This detector
measured the total energy of emitted β+-particles. γ-radiation was measured with surrounding detectors. The half-lives for many nuclides have been determined for
the first time and give important information for the following topics: For the heaviest particle-stable odd-odd nuclei 90Rh, 94Ag and 98In we observed for the first time fast β-decays, compatible with superallowed Fermi transitions and confirmed such decays
for 78Y, 82Nb and 86Tc. We have also observed long-lived T = 0 states in some of these nuclei. We measured the half-lives of all rp-process waiting-point nuclei from 80Zr up to 92, 93Pd. In addition we find the proton drip line nucleus 77Y to decay dominantly via β-decay. To study the Gamov-Teller strength in the β-decay near the doubly magic 100Sn we measured the half-life, β- and γ-spectrum of 102Sn. We propose a level scheme for the daughter nuclide 102In and deduce the Gamov-Teller strength (B
GT = 4.0±0.6). This is one of the largest values known.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: thomas.faestermann@ph.tum.de 相似文献
34.
P. G. Thirolf D. Gassmann D. Habs M. J. Chromik Y. Eisermann G. Graw R. Hertenberger H. J. Maier A. Metz P. Reiter T. Faestermann A. Krasznahorkay M. Hunyadi M. Csatlós J. Gulyás Z. Máté D. Pansegrau H. Scheit D. Schwalm E. Mergel H. Hübel A. Görgen 《Acta Physica Hungarica A》2001,13(1-3):93-110
Spectroscopic studies in the superdeformed shape isomer of 240Pu using γ-spectroscopy, conversion electron spectroscopy and transmission resonance spectroscopy have been performed. In a high-resolution and high-efficiency γ-spectroscopy experiment the out-of-band decays of several excited superdeformed rotational sequences with K=2? and 1? could be identified together with evidence for a weakly populated 0? octupole band. Surprisingly, no low-lying collective quadrupole excitations could be observed. Complementary information could be obtained in conversion electron measurements in coincidence with isomeric fission, resulting in the first identification of the lowest ß-vibrational K=0+ band. For all rotational bands the variation of the moment of inertia with spin could be studied. A predominant population of negative parity states in the second well could be observed, which can be explained by the selective population and depopulation of the second minimum. Complementary transmission resonance measurements have been performed, yielding new information on the fine structure of high-lying (ß-)vibrational multi-phonon states. A new method could be established to determine the excitation energy of the fission isomer ground state from measured level densities. 相似文献
35.
A. Krasznahorkay M. Csatlós L. Csige Y. Eisermann T. Faestermann Z. Gácsi G. Graw J. Gulyás D. Habs M. N. Harakeh M. Heil R. Hertenberger F. Käppeler A. Krasznahorkay H. J. Maier Z. Máté R. Reifarth P. G. Thirolf J. Timár H. F. Wirth 《Acta Physica Hungarica A》2003,18(2-4):323-330
The excitation energy spectrum of fission resonances has been measured with high energy resolution using the 235U(d,pf) reaction in order to study hyperdeformed (HD) rotational bands and HD nuclear shapes. The moments of inertia of the rotational bands and the energy of the ground state in the third minimum were determined. Another signature of these highly deformed states, their enhanced α decay, was also observed. By studying cold or compact fission in the 232Th(n,f) reaction around HD resonances, we obtained data for heavy clustering. 相似文献
36.
D. Habs P. G. Thirolf M. Gross K. Allinger J. Bin A. Henig D. Kiefer W. Ma J. Schreiber 《Applied physics. B, Lasers and optics》2011,103(2):471-484
We propose to produce neutron-rich nuclei in the range of the astrophysical r-process (the rapid neutron-capture process) around the waiting point N=126 (Kratz et al. in Prog. Part. Nucl. Phys. 59:147, 2007; Arnould et al. in Phys. Rep. 450:97, 2007; Panov and Janka in Astron. Astrophys. 494:829, 2009) by fissioning a dense laser-accelerated thorium ion bunch in a thorium target (covered by a polyethylene layer, CH2), where the light fission fragments of the beam fuse with the light fission fragments of the target. Using the ‘hole-boring’
(HB) mode of laser radiation pressure acceleration (RPA) (Robinson et al. in Plasma Phys. Control. Fusion 51:024004, 2009; Henig et al. in Phys. Rev. Lett. 103:245003, 2009; Tajima et al. in Rev. Accel. Sci. Technol. 2:221, 2009) using a high-intensity, short pulse laser, bunches of 232Th with solid-state density can be generated very efficiently from a Th layer (ca. 560 nm thick), placed beneath a deuterated
polyethylene foil (CD2 with ca. 520 nm), both forming the production target. Th ions laser-accelerated to about 7 MeV/u will pass through a thin
CH2 layer placed in front of a thicker second Th foil (both forming the reaction target) closely behind the production target
and disintegrate into light and heavy fission fragments. In addition, light ions (d,C) from the CD2 production target will be accelerated as well to about 7 MeV/u, also inducing the fission process of 232Th in the second Th layer. The laser-accelerated ion bunches with solid-state density, which are about 1014 times more dense than classically accelerated ion bunches, allow for a high probability that generated fission products can
fuse again when the fragments from the thorium beam strike the Th layer of the reaction target. 相似文献
37.
A. Krasznahorkay M. Hunyadi M. Csatlós A. Bałanda A. Gollwitzer G. Graw J. Gulyás D. Habs R. Hertenberger Z. Máté H. J. Maier D. Rudolph P. Thirolf J. Timár B. D. Valnion 《Acta Physica Hungarica A》1998,7(1):35-46
The fission probability and the angular distribution of the associated fission fragments have been measured for the235U(d, pf)236U reaction slightly above the top of the inner fission barrier with the aim of disclosing new hyperdeformed states lying in the third minimum of the fission potential. The results are analyzed together with the data obtained from the literature for234U. The experimental resonances are interpreted as being rotational bands with rotational parameters of ?/2Θ=1.6±0.6 and 1.8±0,8 keV for234U and236U, respectively. TheK=1, 2 and 4 values of the resonances suggest that these rotational bands are built on some higher-lying excited states in the third minimum of the potential well. 相似文献
38.
Vergés JA Guinea F Galán J van Dongen PG Chiappe G Louis E 《Physical review. B, Condensed matter》1994,49(21):15400-15403
39.
40.
T. Suomijärvi J. H. Kelley S. E. Hirzebruch A. Azhari D. Bazin Y. Blumenfeld J. A. Brown P. D. Cottle S. Danczyk M. Fauerbach T. Glasmacher J. K. Jewell K. W. Kemper F. Maréchal D. J. Morrissey S. Ottini J. A. Scarpaci P. Thirolf 《Acta Physica Hungarica A》1997,6(1-4):177-187
The proton scattering on unstable38S nuclei has been measured in inverse kinematics by using a38S secondary beam at 39 MeV/nucleon. The first 2+ state is seen at 1.2 MeV excitation energy and its angular distribution is extracted. Optical and folding model calculations are compared with the elastic and the 2 1 + angular distributions and the β2 value is determined to be 0.35±0.04. This value is compared with the corresponding result from a Coulomb excitation measurement and theM n/Mp value is extracted. 相似文献