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Sökning: L773:0939 7922

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1.
  • Anne, R., et al. (författare)
  • Projectile Coulomb-Excitation with Fast Radioactive Beams
  • 1995
  • Ingår i: Zeitschrift fur Physik A Hadrons and Nuclei. - 1431-5831 .- 0939-7922. ; 352:4, s. 397-401
  • Tidskriftsartikel (refereegranskat)abstract
    • We report a search for gamma rays emanating from Coulomb excitation of fast (30-46 MeV/u) radioactive projectiles He-8, Be-11,Be-12,Be-14 interacting with a lead target. These are clearly identified by their Doppler shift. The 320 keV 1/2(-) --> 1/2(+)gamma transition from Be-11 was observed with a cross-section of 191 +/- 26 mb which is noticeably less than expected from the known lifetime and in the perturbation limit of pure Coulomb excitation. In the other nuclei rather stringent upper limits of 0.01 to 0.2 Weisskopf units, are placed on the hypothetical transition to 1(-) states.
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2.
  • ASZTALOS, SJ, et al. (författare)
  • CONFIRMATION OF THE SUPERDEFORMED BAND IN PB-192
  • 1995
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922 .- 1431-5831. ; 352:3, s. 239-240
  • Tidskriftsartikel (refereegranskat)abstract
    • High-spin states in Pb-192 were populated via the reaction Yb-173(Mg-24,5n) at a beam energy of 140 MeV, and the resulting gamma-rays were deteced using GAMMA-SPHERE. A previously observed superdeformed band in Pb-192 has been confirmed.
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3.
  • Atac, A, et al. (författare)
  • Single-step link of the superdeformed band in Eu-143
  • 1996
  • Ingår i: ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI. - : SPRINGER VERLAG. - 0939-7922. ; 355:4, s. 343-344
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • A discrete gamma-ray transition with an energy of 3360.6 keV deexciting the second lowest SD state in Eu-143 has been discovered. It carries 3.2 % of the full intensity of the band and feeds into a nearly spherical state which is above the I = 35/2((+)),
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6.
  • Borge, M. J. G., et al. (författare)
  • Super-Allowed Beta-Decay of Nuclei at the Drip-Line
  • 1991
  • Ingår i: Zeitschrift fur Physik A Hadrons and Nuclei. - 1431-5831 .- 0939-7922. ; 340:3, s. 255-261
  • Tidskriftsartikel (refereegranskat)abstract
    • We have investigated the continuous particle spectra following the beta decay of the neutron-rich nuclei that terminate the mass 6, 8, 9 and 11 isobaric chains. Strong beta transitions feeding the very top of the spectrum are found systematically. The favoured states are within a few MeV of the energy of the initial state. This phenomenon seems to be linked to the occurrence of a di-neutron structure or neutron halo in the drip-line nuclei.
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7.
  • Borge, M. J. G., et al. (författare)
  • The Axial-Vector Strength in the Proton-Rich Argon Isotopes
  • 1989
  • Ingår i: Zeitschrift fur Physik A Hadrons and Nuclei. - 1431-5831 .- 0939-7922. ; 332:4, s. 413-417
  • Tidskriftsartikel (refereegranskat)abstract
    • The proton-rich isotopes32Ar-35Ar represent the first sequence for which the superallowed Gamow-Teller strength is known out toZ− N=4. The results are compared with two sets of predictions from large shell-model calculations, which give systematically different quenching factors, on the average 0.54 and 0.89. Possible reasons for this are discussed. A comparison is also made with the Gamow-Teller strength of proton-rich isotopes of neighbouring elements.
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8.
  • Brodowski, W, et al. (författare)
  • A signal of a narrow pi NN resonance in pp->pp pi(-)pi(+)
  • 1996
  • Ingår i: ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI. - : SPRINGER VERLAG. - 0939-7922. ; 355:1, s. 5-8
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first exclusive measurement of the 2 pi production in NN collisions at T-p = 750 MeV using a H-2 cluster jet target and the WASA/PROMICE detector at CELSIUS. In the invariant-mass spectrum M(pp pi-) we observe a narrow peak at 2.063(2) Ge
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9.
  • Cederwall, Bo, et al. (författare)
  • HIGH-SPIN STATES OF BA-120
  • 1991
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922 .- 1431-5831. ; 338:4, s. 461-462
  • Tidskriftsartikel (refereegranskat)abstract
    • The very neutron deficient nucleus 120Ba has been investigated in a high-spin gamma-spectroscopic study. The yrast band of 120Ba is extended up to spin 22 h and one tentatively assigned negative-parity side band is observed up to spin 15 h. The experimental results are compared with Total Routhian Surface calculations.
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10.
  • Cederwall, Bo, et al. (författare)
  • NEUTRON AND PROTON H11/2 ALIGNMENT EFFECTS IN LA-121
  • 1991
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922 .- 1431-5831. ; 338:4, s. 463-464
  • Tidskriftsartikel (refereegranskat)abstract
    • In a gamma-spectroscopic study, excited states in the very neutron deficient nucleus 121La have been established for the first time. Rotational bands build on the 9/2+[404] and 1/2-[550] Nilsson orbitals are observed up to a maximum spin of tentatively 51/2 h. The experimental results are compared with Total Routhian Surface calculations.
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12.
  • DOMBRADI, Z, et al. (författare)
  • IDENTIFICATION AND SPECTROSCOPY OF THE TE-108 NUCLEUS
  • 1994
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922 .- 1431-5831. ; 350:1, s. 3-4
  • Tidskriftsartikel (refereegranskat)abstract
    • Excited states of Te-108 were populated in the Fe-54 + Ni-58 (270 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron detector systems for reaction channel separation. Gamma rays belonging to the neutron deficient nucleus Te-108 were identified for the first time. On the basis of gammagamma-coincidence and angular correlation relations a level scheme was constructed with tentative spin and parity assignments. The structure of the nucleus is discussed in the framework of systematics of heavier Te nuclei.
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13.
  • Faldt, Goran, et al. (författare)
  • Comparison of the near-threshold production of eta- and K-mesons in proton-proton collisions
  • 1997
  • Ingår i: ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI. - : SPRINGER VERLAG. - 0939-7922. ; 357:3, s. 241-243
  • Tidskriftsartikel (refereegranskat)abstract
    • The pp --> pp eta and pp --> p Lambda K+ reactions near threshold are dominated by the first and second S-11 resonance respectively. It is shown that a one-pion-exchange model exciting these isobars reproduces well the ratio of the production cross sectio
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14.
  • Fredriksson, K, et al. (författare)
  • Fine-structure measurements for highly excited F states of cesium
  • 1978
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 284:4, s. 429-430
  • Tidskriftsartikel (refereegranskat)abstract
    • The fine-structure splittings of highly excited F-states in Cs were measured using high-resolution laser spectroscopy. The 12 and 132F states were found to be inverted with splittings ?E (122F)=-522(3) MHz and ?E (132F)=-416(3) MHz.
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15.
  • Fredriksson, K, et al. (författare)
  • Measurement of the fine-structure splitting of the 4^(2)D state of lithium using level-crossing spectroscopy
  • 1977
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 283:3, s. 227-230
  • Tidskriftsartikel (refereegranskat)abstract
    • The fine-structure splitting of the 42D state in lithium was measured using stepwise laser excitation combined with level-crossing spectroscopy. The splitting was determined to be 456.2(0.8) MHz, a considerably higher value than the one obtained in a recent level-anticrossing measurement. The new value is in good agreement with the result of a Hartree-Fock calculation, 460.2 MHz.
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16.
  • Fredriksson, K, et al. (författare)
  • Stark interaction for excited states in alkali atoms, investigated by laser spectroscopy
  • 1977
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 281:3, s. 189-197
  • Tidskriftsartikel (refereegranskat)abstract
    • The scalar polarizability constanta0 for excitedS- andD-states in rubidium and cesium was measured utilizing a two-step excitation scheme. An rf lamp and a single-mode dye laser were used to excite the atoms in a collimated atomic beam. Values ofa0 were determined for the 9–102S1/2 and 7–82D3/2 states of rubidium and for the 10–132S1/2, 9–102D3/2 and 9–112D5/2 states of cesium. Further, the isotope shift was evaluated in the 5579 Å rubidium line. A review of experimental polarizability constants for rubidium and cesium is given, and the results are compared with theoretical values.
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17.
  • Gardestig, A (författare)
  • Threshold production of the hypertriton
  • 1997
  • Ingår i: ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI. - : SPRINGER VERLAG. - 0939-7922. ; 357:1, s. 101-105
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The cross section for threshold production of the hypertriton in the reaction pd --> (LambdaHK+)-H-3 is calculated in a two-step model and compared to the break-up process pd --> d Lambda K+. The latter process is shown to be dominant already at 2 MeV abo
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18.
  • Garpman, S, et al. (författare)
  • Lifetimes of some highly excited levels in the Pb-I spectrum measured by the Hanle method
  • 1971
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 241:3, s. 217-235
  • Tidskriftsartikel (refereegranskat)abstract
    • Natural lifetimes of some highly excited levels in the Pb-I spectrum have been measured by the zero field level crossing (Hanle) method. The levels were reached by optical excitation from the metastable 6p2 3P2 and 6p2 3P1 states, were a considerable population had been created by means of adc discharge in a Pb atomic beam. An atomic beam source producing atoms in metastable states is described. For the lifetimes t of the investigated levels we find:t(6p(1/2)6d3D1)=3.74(28) ns,t(6p(1/2)6d3F2)=25.8(1.3) ns,t(6p(1/2)6d3D2)=4.17(-31)(-49) ns,t(6p(1/2)6d3F3)=6.08(26) ns,t(6p(3/2)7s)3P2=5.85(27) ns. These results are compared with lifetimes derived from oscillator strengths given in the literature.
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19.
  • Garpman, S, et al. (författare)
  • Optical double resonance and zero field level crossing spectroscopy applied to the 5p^(3)6s^(5)S_(2) level in the Te-I spectrum
  • 1971
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 247:3, s. 238-251
  • Tidskriftsartikel (refereegranskat)abstract
    • As a first application of optical double resonance and zero field level crossing spectroscopy to the elements of the sixth group in the periodic table of the atoms, the 5p36s5S2 level in the Te-I spectrum was investigated using natural tellurium in a high temperature quartz cell. For the electronic Landé-factor and the natural radiative lifetime the following values were obtained:$$g_J \left( {5p^3 6s^5 S_2 } \right) = - 1.9657\left( {12} \right),\tau \left( {5p^3 6s^5 S_2 } \right) = 71.8\left( {2.2} \right)ns.$$
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21.
  • Grafström, Peter, et al. (författare)
  • Hyperfine structure and isotope shift of highly excited barium-I states
  • 1982
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 306:4, s. 281-284
  • Tidskriftsartikel (refereegranskat)abstract
    • High-resolution laser-spectroscopy measurements of hyperfine structure and isotope shifts were performed for the 6snd 1 D 2 sequence of Ba-I in the regionn=12–24. Stepwise laser excitations of a collimated atomic beam were used. A strong influence on the hyperfine structure is observed at the perturbation atn=14, caused by interaction with the 5d7d configuration. Whereas the isotope shift for the even isotopes stays essentially constant with increasingn, the odd isotopes exhibit a strong change, indicating hyperfine-induced shifts. Interesting discussions with Prof. E. Matthias in the final stage of this work are gratefully acknowledged. This work was supported by the Swedish Natural Science Research Council.
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22.
  • Grundevik, P, et al. (författare)
  • High resolution laser fluorescence spectroscopy in the deep blue spectral region
  • 1977
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 283:2, s. 127-132
  • Tidskriftsartikel (refereegranskat)abstract
    • High-resolution laser spectroscopy measurements have been performed in the wavelength region around 4000 Å using a pulsed dye laser acting on a collimated atomic beam. Extra-cavity Fabry-Pérot filtering was used to achieve a narrow line-width of the laser light. Isotope shifts were measured in the 4216 Å and 4202 Å rubidium lines with the result ?s(87, 85)=124.3(4)MHz, and?s(87, 85) = 124.2(7)MHz, respectively, and in the 3988 Å ytterbium line with the resultds(176, 174)=-509(4)MHz, ?s(174, 172)=-530(4) MHz.
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23.
  • Grundevik, P, et al. (författare)
  • Hyperfine structure in the 6p5d configuration and isotope shifts in transitions between the 6s5d and the 6p5d configurations in Ba I
  • 1982
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 306:3, s. 195-209
  • Tidskriftsartikel (refereegranskat)abstract
    • High-resolution laser fluorescence spectroscopy, using a single-mode dye laser acting on a collimated atomic beam, has been performed to determine the hyperfine-structure (hfs) constants in six states of the 6p 5d configuration of135Ba and137Ba. Isotope shifts (IS) for eleven transitions between the 6s 5d and the 6p 5d configurations have also been measured. From an analysis of the energy levels, intermediate angular wavefunctions have been deduced. The wavefunctions are used to evaluate experimental hyperfine parameters from the experimental hfs constants. The parameters are, for the magnetic-dipole interaction compared with theoretical values, and for the electricquadrupole interaction used to estimate the nuclear quadrupole moments for the odd isotopes.
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  • Resultat 1-25 av 47

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