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1.
A. Płochocki K. Rykaczewski T. Batsch J. Szerypo J. Żylicz R. Barden O. Klepper E. Roeckl D. Schardt H. Gabelmann P. Hill H. Ravn T. Thorsteinsen I. S. Grant H. Grawe P. Manakos L. D. Skouras 《Zeitschrift für Physik A Hadrons and Nuclei》1992,342(1):43-51
For the first time, detailed decay-spectroscopic investigations were performed for the very neutron-deficientN=50 nuclide98Cd. The98Cd activity was produced in spallation reactions between 600 MeV protons and a natural tin target, yielding a98Cd beam intensity of 10 to 60 atoms/s at the collector of the ISOLDE massseparator. By means of-ray and conversion-electron spectroscopy, 19 transitions were found to follow the +/EC decay98Cd98Ag. The transitions at 61 and 107 keV were shown to beM1(+E2) andE2, respectively, and the98Cd half-life was measured as 9.2±0.3 s. TheQ
EC value of98Cd is determined semiempirically and is compared to model predictions together with the measuredQ
EC values of the neighbouring cadmium isotopes100,102Cd and theN=50 isotones92Mo,94Ru, and96Pd, taken from the literature. The newly established decay scheme of98Cd includes 9 excited states of98Ag. Four states at 1691, 1861, 2164, and 2544 keV are directly fed by 0+ 1+ Gamow-Teller beta transitions with a summed strength of 3.5
–0.7
+0.8
. This value corresponds to 25±5% of the strength predicted for the GT transformation of a g9/2 proton (in98Cd) into a g7/2 neutron (in98Ag) by the extreme single-particle shell model. The GT-strength splitting and quenching, observed for98Cd, are compared with the corresponding data for lighter even-even N=50 isotones, and are discussed with reference to the predictions of more sophisticated nuclear models. We find that only in some cases it is possible to explain qualitatively the observed GT strength distribution and its total magnitude without renormalizing the free-neutron value of the axial-vector coupling constant.Dedicated to Prof. P. Armbruster on the occasion of his 60th birthday 相似文献
2.
J. Szerypo H. J. Maier H. F. Wirth H. U. Friebel D. Frischke 《Journal of Radioanalytical and Nuclear Chemistry》2014,299(2):1145-1148
The Technological Laboratory of LMU is undergoing major changes. Most important of them is raising a DLC-Factory’s for diamond-like-carbon (DLC) foils production and a shutdown of the Hot-Lab Facility. Current Laboratory status and development plans are presented in this paper. 相似文献
3.
G. Bollen F. Ames G. Audi D. Beck J. Dilling O. Engels S. Henry F. Herfurth A. Kellerbauer H.-J. Kluge A. Kohl E. Lamour D. Lunney R. B. Moore M. Oinonen C. Scheidenberger S. Schwarz G. Sikler J. Szerypo C. Weber 《Hyperfine Interactions》2001,132(1-4):213-220
Penning trap mass spectrometry has reached a state that allows its application to very short-lived nuclides available from
various sources of radioactive beams. Mass values with outstanding accuracy are achieved even far from stability. This paper
illustrates the state of the art by summarizing the status of the ISOLTRAP experiment at ISOLDE/CERN. Furthermore, results
of mass measurements on unstable rare earth isotopes will be given.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
J. Szerypo B. Szweryn P. Hornshøj H. Loft Nielsen M. Luontama 《Zeitschrift für Physik A Hadrons and Nuclei》1986,323(1):97-100
The excitation function for the radiative capture232Th(p, γ)233Pa has been determined in the proton energy range 7 to 20 MeV by an activation method. The results are compared with a compound nucleus model prediction and earlier experimental data for another deformed nuclide176Yb. As in previous cases an enhancement over the CN-model prediction is observed and the excitation of the giant dipole resonance via the direct-semidirect reaction process is a likely explanation. Supplementary measurements of the232Th (p, f) excitation function in the proton energy range 11–20 MeV have been performed. 相似文献
5.
D. Beck F. Ames G. Audi G. Bollen H.-J. Kluge A. Kohl M. König I. Martel D. Lunney R.B. Moore H. Raimbault-Hartmann M. de Saint Simon E. Schark S. Schwarz J. Szerypo the ISOLDE Collaboration 《Hyperfine Interactions》1997,108(1-3):219-225
First direct mass measurements on rare earth isotopes around 146Gd have been performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. More than 40 isotopes of the elements
Pr, Nd, Pm, Sm, Eu, Dy and Ho have been measured with an accuracy of typically 1 × 10-7. In the case of 141Sm isomeric and ground state (ΔE = 175 keV) were resolved. Since isobaric contaminations are present in the ISOLDE beam, these
measurements on rare earth isotopes became only possible after the installation of a new cooler trap which acts an isobar
separator.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
6.
W. Kurcewicz J. Szerypo P. Hornshøj N. Rud Z. Zelazny W. Reisdorf 《Zeitschrift für Physik A Hadrons and Nuclei》1982,306(2):99-103
The excitation function for the232Th(p,f) reaction has been determined in the energy range from 4 to 11 MeV. A discrepancy existing in the literature is resolved. The mass yield distribution has been studied at 8 MeV proton energy and the peak-to-valley ratio has been determined to be 9.2. The fission data, together with evaporation residue data from an earlier experiment, are understood rather well within the framework of a statistical decay model which derives its parameters from independent data. The absorption cross sections for protons in the vicinity of and below the Coulomb barrier are also discussed and confronted with optical model predictions using published global proton potentials. 相似文献
7.
D. Beck F. Ames G. Audi G. Bollen F. Herfurth H. -J. Kluge A. Kohl M. König D. Lunney I. Martel R. B. Moore H. Raimbault-Hartmann E. Schark S. Schwarz M. de Saint Simon J. Szerypo 《The European Physical Journal A - Hadrons and Nuclei》2000,8(3):307-329
Direct mass measurements of neutron-deficient rare-earth isotopes in the vicinity of 146Gd were performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. This paper reports on the measurement of
more than 40 isotopes of the elements praseodymium, neodymium, promethium, samarium, europium, dysprosium and holmium, that
have been measured with a typical accuracy of
m
14 keV. An atomic mass evaluation has been performed taking into account other experimental mass values via a least-squares
adjustment. The results of the adjustment are discussed.
Received: 18 April 2000 / Accepted: 12 July 2000 相似文献
8.
J. Szerypo V. S. Kolhinen M. Bussmann E. Gartzke D. Habs J. Neumayr U. Schramm C. Schürmann M. Sewtz P. G. Thirolf 《The European Physical Journal A - Hadrons and Nuclei》2009,42(3):319-322
The MLLTRAP at the Maier-Leibnitz-Laboratory (Garching) is a new Penning trap facility designed to combine several novel technologies
to decelerate, charge breed, cool, bunch and purify the reaction products and perform high-accuracy nuclear and atomic mass
measurements. It is now in the commissioning phase, achieving a mass-resolving power of about 105 in the purification trap for stable ions. 相似文献
9.
10.
M. Karny L. Batist B. A. Brown D. Cano-Ott R. Collatz A. Gadea R. Grzywacz A. Guglielmetti M. Hellstrm Z. Hu Z. Janas R. Kirchner F. Moroz A. Piechaczek A. P
ochocki E. Roeckl B. Rubio K. Rykaczewski M. Shibata J. Szerypo J. L. Tain V. Wittmann A. Whr 《Nuclear Physics A》2001,690(4):45
The Gamow–Teller β decays of the neutron-deficient indium isotopes 104–107In have been investigated by using total absorption γ-ray spectrometry on mass-separated sources. The experimental Gamow–Teller strength, deduced as a function of the excitation energy in the daughter nuclei 104–107Cd, is compared to shell-model predictions. 相似文献