共查询到20条相似文献,搜索用时 15 毫秒
1.
Sz. Nagy T. Fritioff A. Solders R. Schuch M. Björkhage I. Bergström 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(1):1-4
High-precision mass measurements on lithium-like and hydrogen-like 40Ca-ions are reported. The obtained mass of the hydrogen-like and lithium-like ion is 39.952181819(29) u and 39.953272223(24) u,
respectively. The corresponding mass of the 40Ca atom is 39.962590858(22) u. This new value has a precision ten times higher than the literature value. 相似文献
2.
M. Mukherjee D. Beck K. Blaum G. Bollen J. Dilling S. George F. Herfurth A. Herlert A. Kellerbauer H. -J. Kluge S. Schwarz L. Schweikhard C. Yazidjian 《The European Physical Journal A - Hadrons and Nuclei》2008,35(1):1-29
ISOLTRAP is a Penning trap mass spectrometer for high-precision mass measurements on short-lived nuclides installed at the
on-line isotope separator ISOLDE at CERN. The masses of close to 300 radionuclides have been determined up to now. The applicability
of Penning trap mass spectrometry to mass measurements of exotic nuclei has been extended considerably at ISOLTRAP by improving
and developing this double Penning trap mass spectrometer over the past two decades. The accurate determination of nuclear
binding energies far from stability includes nuclei that are produced at rates less than 100 ions/s and with half-lives well
below 100ms. The mass-resolving power reaches 107 corresponding to 10keV for medium heavy nuclei and the uncertainty of the resulting mass values has been pushed down to below
10-8. The article describes technical developments achieved since 1996 and the present performance of ISOLTRAP. 相似文献
3.
S. Rahaman V.-V. Elomaa T. Eronen U. Hager J. Hakala A. Jokinen A. Kankainen I. D. Moore H. Penttilä S. Rinta-Antila J. Rissanen A. Saastamoinen T. Sonoda C. Weber J. Äystö 《The European physical journal. Special topics》2007,150(1):349-352
The Penning trap mass spectrometer JYFLTRAP was used to measure the atomic masses of radioactive nuclei with an uncertainty
better than 10 keV. The atomic masses of the neutron-deficient nuclei around the
line were measured to improve the understanding of the rp-process path and the SbSnTe cycle. Furthermore, the masses of the
neutron-rich gallium (
) to palladium (
) nuclei have been measured. The physics impacts on the nuclear structure and the r-process paths are reviewed. A better understanding
of the nuclear deformation is presented by studying the pairing energy around
. 相似文献
4.
M. Block D. Ackermann K. Blaum A. Chaudhuri Z. Di S. Eliseev R. Ferrer D. Habs F. Herfurth F. P. Heßberger S. Hofmann H.-J. Kluge G. Maero A. Martín G. Marx M. Mazzocco M. Mukherjee J. B. Neumayr W. R. Plaß W. Quint S. Rahaman C. Rauth D. Rodríguez C. Scheidenberger L. Schweikhard P. G. Thirolf G. Vorobjev C. Weber 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,45(1):39-45
The Penning-trap mass spectrometer SHIPTRAP allows precision mass
measurements of rare isotopes produced in fusion-evaporation reactions. In
the first period of operation the masses of more than 50 neutron-deficient
radionuclides have been measured.
In this paper the perspectives for direct mass measurements
of rare isotopes around nobelium are discussed and the achievable precision is addressed.
The temporal stability of the magnetic field, an important issue for the long
measurement times resulting from the low production rates, was investigated and the
time-dependent uncertainty due to magnetic field fluctuations was determined.
Based on the present performance direct mass measurements of nobelium isotopes are
already feasible. With several technical improvements heavier elements between Z=102–105 will be in reach. 相似文献
5.
M. Kretzschmar 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,48(3):313-319
In this note a simple idea is suggested to calculate the effect of damping on the ion motion in a Penning trap. The analysis
is restricted to the experimentally important special case that the axial motion (z-direction) is not coupled to that in the
xy-plane, so that both motions can be treated separately. The method views the cyclotron frequency ωc as a complex variable that can be continued analytically from real values (undamped case) into the complex plane. The power
of the approach becomes obvious in connection with advanced problems such as the calculation of line profiles for quadrupole
excitation. 相似文献
6.
T. Fritioff C. Carlberg G. Douysset R. Schuch I. Bergström 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,15(2):141-143
The atomic and nuclear masses of 4He and 3He have been measured using doubly charged ions in a Penning trap connected to an electron beam ion source. Recent technical
improvements allow mass determinations with uncertainties of a few parts in 1010. The obtained atomic masses are 4.002 603 256 8(13) u and 3.016 029 323 5(28) u respectively. These values deviate by as
much as 5 standard deviations from the accepted values.
Received 23 October 2000 and Received in final form 6 February 2001 相似文献
7.
C. Scheidenberger 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):7-11
The present status and recent results from direct mass measurements of exotic nuclei are presented. ISOL, in-flight, and combined
facilities provide a wide variety of nuclides far-off stability covering a wide range of half-lives down to the sub-millisecond
region. Modern direct mass measurements are carried out using frequency and time-of-flight techniques. The obtained accurate
mass data point to nuclear-structure phenomena and serve as a basis for astrophysical and weak-interaction studies.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: c.scheidenberger@gsi.de 相似文献
8.
Kellerbauer A. Blaum K. Bollen G. Herfurth F. Kluge H.-J. Kuckein M. Sauvan E. Scheidenberger C. Schweikhard L. 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,22(1):53-64
For a detailed study of the accuracy of the Penning trap mass spectrometer ISOLTRAP all expected sources of uncertainty were
investigated with respect to their contributions to the uncertainty of the final result. In the course of these investigations,
cross-reference measurements with singly charged carbon clusters 12C+
n were carried out. The carbon cluster ions were produced by use of laser-induced desorption, fragmentation, and ionization
of C60 fullerenes and injected into and stored in the Penning trap system. The comparison of the cyclotron frequencies of different
carbon clusters has provided detailed insight into the residual systematic uncertainty of ISOLTRAP and yielded a value of
8×10-9. This also represents the current limit of mass accuracy of the apparatus. Since the unified atomic mass unit is defined
as 1/12 of the mass of the 12C atom, it will be possible to carry out absolute mass measurements with ISOLTRAP in the future.
Received 7 June 2002 Published online 6 November 2002
RID="a"
ID="a"e-mail: a.kellerbauer@cern.ch
RID="b"
ID="b"Current address: Centre de Physique des Particules de Marseille, 13288 Marseille Cedex 9, France. 相似文献
9.
R. Ferrer K. Blaum M. Block F. Herfurth J. Ketelaer Sz. Nagy D. Neidherr C. Weber 《The European physical journal. Special topics》2007,150(1):347-348
The Penning-trap mass spectrometer SHIPTRAP at GSI is designed to provide clean and cooled beams of singly charged radioactive
ions produced in fusion-evaporation reactions and separated in-flight by the velocity filter SHIP. The scientific goals include
mass spectrometry, atomic and nuclear spectroscopy, and chemistry of transuranium species which are not available at ISOL-
or fragmentation facilities Penning-trap based mass measurements on radionuclides relies up to now on the destructive time-of-flight
ion-cyclotron-resonance method. One of the main limitations to the experimental investigations is the low production rate
of most of these exotic nuclides, for which the use of this detection scheme is not applicable. A sensitive and non-destructive
method, like the narrow-band Fourier Transform ion-cyclotron-resonance technique, is ideally suited for the identification
and characterization of these species. A new cryogenic trap setup for SHIPTRAP exploiting this detection technique as well
as some results of first preparatory tests are presented. 相似文献
10.
A. Chaudhuri M. Block S. Eliseev R. Ferrer F. Herfurth A. Martín G. Marx M. Mukherjee C. Rauth L. Schweikhard G. Vorobjev 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,45(1):47-53
A carbon-cluster ion source has been installed and tested
at SHIPTRAP, the Penning-trap mass spectrometer for precision mass
measurements of heavy elements at GSI. Carbon-cluster ions
12Cn
+, 5 ≤n ≤23, were produced by
laser-induced desorption and ionization from
a
carbon sample. They
were tested for the first time as reference ions in an on-line mass
measurement of the radionuclides 144Dy, 146Dy and
147Ho. In addition, carbon clusters of various sizes were used
for an investigation of the systematic uncertainty of SHIPTRAP
covering a mass range from 84 u to 240 u. The mass-dependent
uncertainty was found to be negligible for the case of
(m-m ref)< 100 u. However, a systematic uncertainty of 4.5
×10-8 was revealed. 相似文献
11.
J. P. Marques F. Parente P. Indelicato 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,41(3):457-465
In this paper, we used the multiconfiguration Dirac-Fock method to compute with high precision the influence of the hyperfine
interaction on the [Ar]
P0 level lifetime in Zn-like ions for stable and some quasi-stable isotopes of nonzero nuclear spin between Z=30 and Z=92. The
influence of this interaction on the
[Ar]
P
P0 separation energy is also calculated for the same ions. 相似文献
12.
Progress is reviewed of available data for evaluation of atomic masses since the 1995 one. Many more direct mass measurements
have become available, especially in the region of proton-rich nuclides. The number of alpha- and, especially, proton-decay
data increased considerably. In the region of superhigh mass numbers, many very interesting new observations were made.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: wapstra@nikhef.nl 相似文献
13.
C. Rauth D. Ackermann G. Audi M. Block A. Chaudhuri S. Eliseev F. Herfurth F. P. Heßberger S. Hofmann H.-J. Kluge A. Martín G. Marx M. Mukherjee J. B. Neumayr W. R. Plaß S. Rahaman D. Rodríguez L. Schweikhard P. G. Thirolf G. Vorobjev C. Weber 《The European physical journal. Special topics》2007,150(1):329-335
14.
15.
T. Rzaca-Urban W. Urban M. Saha Sarkar S. Sarkar J. L. Durell A. G. Smith B. J. Varley I. Ahmad 《The European Physical Journal A - Hadrons and Nuclei》2007,32(1):5-9
The Penning trap mass spectrometer JYFLTRAP, coupled to the Ion Guide Isotope Separator On-Line (IGISOL) facility at Jyv?skyl?,
was employed to measure the atomic masses of neutron-rich 70-73Ni and 73, 75Cu isotopes with a typical accuracy less than 5keV. The mass of 73Ni was measured for the first time. Comparisons with the previous data are discussed. Two-neutron separation energies show
a weak subshell closure at 68
28Ni40 . A well established proton shell gap is observed at Z = 28 . 相似文献
16.
V. -V. Elomaa T. Eronen U. Hager J. Hakala A. Jokinen A. Kankainen I. D. Moore S. Rahaman J. Rissanen V. Rubchenya C. Weber J. ?yst? 《The European Physical Journal A - Hadrons and Nuclei》2009,40(1):1-9
A survey of neutron-deficient nuclides which can be produced via proton- and 3He -induced fusion-evaporation reactions in the A = 100 region was made using a Penning trap as a high-resolution mass filter. A comparison of the measured isotopic rates
with a statistical model calculation for the proton-induced reactions shows the importance of using the precise binding energy
values for the final reaction products. In particular, proton separation energies were found to play an important role in
the evaporation process. In addition, accurate masses of 12 nuclides, 97-99, 101Pd , 100Ag , 101-105Cd and 102, 104In , were determined with uncertainties of less than 10keV. 相似文献
17.
S. Rinta-Antila T. Eronen V. -V. Elomaa U. Hager J. Hakala A. Jokinen P. Karvonen H. Penttilä J. Rissanen T. Sonoda A. Saastamoinen J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2007,31(1):1-7
A new technique to produce isobarically pure ion beams for decay spectroscopy by using a gas-filled Penning trap was commissioned
at the ion guide isotope separator on-line facility, IGISOL. β-decays of neutron-rich 100Zr, 102Zr and 104Zr isotopes were studied with this technique. In addition, the
values of 100,102,104Zr β-decays were determined from the direct mass measurements of zirconium and niobium isotopes performed with a high-precision
Penning trap. The mass of 104Nb was directly measured for the first time and the obtained mass excess value for the longer-living (1+) state is -71823±10 keV. For the ground states of 100Nb and 102Nb the obtained mass excess values were -79802±20 keV and -76309±10 keV, respectively. The observed distribution of the β
strength supports a prolate deformation assignment for 100,102,104Zr isotopes. 相似文献
18.
M. Drewsen 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,45(1):125-127
We briefly discuss some possibilities for cooling, identification and spectroscopy of super-heavy element (SHE) ions based
on recent results obtained from studies of atomic and molecular ions in linear rf traps. Since these investigations only relied
on the charge and the mass of the ion of interest, we believe it should be straight forward to adopt most of the techniques
for SHE ion research. 相似文献
19.
M. Mukherjee D. Beck K. Blaum G. Bollen P. Delahaye J. Dilling S. George C. Guénaut F. Herfurth A. Herlert A. Kellerbauer H. -J. Kluge U. Köster D. Lunney S. Schwarz L. Schweikhard C. Yazidjian 《The European Physical Journal A - Hadrons and Nuclei》2008,35(1):31-37
Frequency ratio measurements with different combinations of the singly charged ions from 21, 22, 23Na , 22, 24Mg , and 37, 39K were performed at the on-line Penning trap mass spectrometer ISOLTRAP, CERN, Geneva. The masses and mass differences were
deduced with a relative uncertainty of about or even below one part in 108 for the ions of interest using a least-squares analysis of all measured relations. The results have direct consequences for
weak-interaction study as they give additional input to the test of CVC, and for nuclear astrophysics, because they help to
establish the minimum observable signal for a NeNa cycle in a nova burst. We report here about the measurements and the detailed
evaluation. 相似文献
20.
A. Kankainen L. Batist S. A. Eliseev V. -V. Elomaa T. Eronen U. Hager J. Hakala A. Jokinen I. Moore Yu. N. Novikov H. Penttilä K. Peräjärvi A. V. Popov S. Rahaman S. Rinta-Antila P. Ronkanen A. Saastamoinen D. M. Seliverstov T. Sonoda G. K. Vorobjev J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2006,29(3):271-280
The masses of 80, 81, 82, 83Y, 83, 84, 85, 86, 88Zr and 85, 86, 87, 88Nb have been measured with a typical precision of 7keV by using the Penning trap setup at IGISOL. The mass of 84Zr has been measured for the first time. These precise mass measurements have improved Sp and QEC values for astrophysically important nuclides. 相似文献