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  • 1985-1989  (4)
  • 1970-1974
  • 23.40.Hc  (3)
  • Endorectal ultrasound  (1)
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  • 1
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The new proton-rich nucleus104Sn was produced in a50Cr(58Ni, 2p2n)104Sn reaction. Its half-life was measured to be 21±1s. From a newly established partial decay scheme, aQ EC value of 4,000 −300 +650 keV was estimated. The resulting mass excess value for104Sn, combined with decay energies for α and proton emission, leads to mass excess values for the nuclei108Te,109I,112Xe, and113Cs. These mass values are compared to predictions of mass formulae.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 374 (1989), S. 164-168 
    ISSN: 1435-2451
    Keywords: Rectal carcinoma ; Preoperative staging ; Computed tomography ; Endorectal ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer prospektiven Studie wurde bei 49 Patienten mit Rectumcarcinom die Korrelation des prä and postoperativen Stagings mit der endorectalen Sonographie (ES) mit der der CT unter Berüchtigung des Tumorstadiums nach TNM verglichen. Mit CT korrelierten die prä-und postoperativen Stadien in T1 bei 9/10, in T2 bei 10/16, in T3 bei 13/15 and in T4 bei 6/8 Patienten. Nach ES fanden sich prä- und postoperativ übereinstimmende Befunde in allen T1, in 10/12 T2, in 17/20 T3 und in 6/7 T4 Stadien. Insgesamt korre lierte das prä- und postoperative Staging nach CT bei 38 and nach ES bei 43/49 Patienten. Das Tumorstadium wurde mit beiden Methoden präoperativ fast gleich häuftg überschätzt: 5ma1 nach CT und 4mal nach ES. Eine Unterschätzung des Stadiums erfolgte häufiger nach CT in 5 Fällen gegenüber 2 nach ES. (CT: Richtigkeit 77,5%, Sensitivität 88,3%, Spezifitat 94,4%; ES: Richtigkeit 87,7%, Sensitivitat 91,5%, Spezifitat 97,8%). Diagnostische Kriterien werden diskutiert. In frühen Tumorstadien läßt sich die Infiltrationstiefe mit der ES besser beurteilen als mit CT. Bei fortgeschrittenen Tumoren geben beide Methoden wichtige Informationen für die Planung der chirurgischen Therapie.
    Notes: Summary In a prospective study in 49 patients with rectal carcinoma the correlation of pre- and postoperative staging by CT and endorectal ultrasound-(EU) was compared according to TNM-classification. With CT the pre/postoperative results correlated in T1 in 9/10, in T2 in 10/16, in T3 in 13/15 and in T4 in 6/8 patients. By EU identical results were found in all T1, in 10/12 T2, in 17/20 T3 and in 6/7 T4 stages. Overall, pre- and postoperative identical results were found by CT in 38 and by EU in 43/49 patients. Overestimation of the tumor stage was similar with both methods: 5 by CT and 4 by EU. Underestimation of the stage was more often by CT in 5 than by EU in 2 cases. (CT: accuracy 77.5%, sensitivity 88.3%, specificity 94.4%; ES: accuracy 87.7% sensitivity 91.5%, specificity 97.8%). Criteria for interpretation are discussed. In early tumor stages the depth of tumor invasion can be better evaluated by EU. In late stages both methods give important information for surgical strategy.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc ; 27.60.+j ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With the use of the58Ni+50Cr fusion-evaporation reaction and chemically selective on-line mass separation, the EC/β + decay of104Sn was studied byγ-ray and conversionelectron spectroscopy. In the course of these studies, a new 15.7-s isomeric state of104In was observed. Reinvestigation of theβ-decays of the two heavier even isotopes of tin, produced in the58Ni+58Ni reaction and mass separated without chemical discrimination, brought new information on the decay of106Sn and108Sn. The QEC values of104Sn,106Sn and108Sn were determined to be 4550 −250 +300 keV, 3200±100 keV and 〈 2270 keV, respectively. In the data analysis, the emphasis is put on the identification of the 0+ → 1+ Gamow-Tellerβ transitions and determination of their strengths. For104−110Sn, the total Gamow-Teller strengths are measured to be 20% to 30% of that predicted by the single-particle shell model with the inclusion of pairing correlations and core polarization. Predictions of the decay properties of the as yet unobserved102Sn and100Sn are made.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc ; 27.60.+j ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the40Ca(4.2 MeV/u) +60Ni reaction and on-line mass separation, the decay properties of 46 96 Pd50 were reinvestigated. From a comparison of experimental and theoreticalβ +/(EC +β +) probability ratios, theQ EC value was deduced to be 3,450 ± 150 keV. The strength was determined for four 0+→1+ Gamow-Teller beta transitions and found to be quenched as compared to predictions of the single-particle shell model. For96Pd and94Ru the sources of this quenching are discussed.
    Type of Medium: Electronic Resource
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