Saturation-dips in the weak calcium intercombination line

Klingbeil, Ulrich; Kowalski, J.; Träger, F.; Wiegemann, H. B.; Putlitz, G. zu

doi:10.1007/bf00885256

Cited by 12 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental linewidths as narrow as 900kHz have been obtained. The principal difference of the method compared to other experiments using saturation spectroscopy is that the saturation dips are not observed in transmission but via resonance fluorescence [7,8]. This is more efficient because weak spectral lines like the Ca-intercombination transition (f=3.7.10 -5) together with relatively low vapour densities in the atomic beam lead to a very small absorption, which in the present case is typically 10 5 cm-…”

Section: Experimental Technique and Set-upmentioning

confidence: 87%

“…The experimental arrangement which has been described in detail elsewhere [7][8][9] consists of a stabilized cw dye laser and a collimated atomic beam of natural calcium. The atomic beam and the light beam of the laser intersect each other at right angles in an interaction region where the atoms are excited to the 3P~-state (r=0.4ms).…”

Section: Experimental Technique and Set-upmentioning

confidence: 99%

“…In addition, the technique of high resolution atomic beam saturation spectroscopy [7,8] is used for the identification of the atomic absorption lines. The F=9/2 and F =7/2 hfs components of 43Ca have been resolved and identified.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isotope shift and hyperfine structure of43Ca by laser spectroscopy

et al. 1979

Self Cite

View full text Add to dashboard Cite

The isotope shift 4~ in the 4s 2 ISo-4s4p 3p: intercombination line as well as the hyperfine structure splitting of the 4s4p 3/]1 state of 43Ca have been remeasured by saturation spectroscopy with a tunable stabilized ca, dye laser and an atomic beam of natural Ca as absorber. The nuclear charge radius of 43Ca obtained here reconciles our result with the radius obtained from measurements in muonic Ca-atoms and in the Ca resonance line. It reconfirms the fact that the charge radius of 43Ca is considerably smaller than the ones of both neighbouring even isotopes. The discrepancy of our previous measurement for this charge radius was due to a wrong assignment of so far unobserved absorption lines of probably molecular origin occuring in the neighbourhood of the atomic resonances under study.

show abstract

Section: Experimental Technique and Set-upmentioning

confidence: 87%

Section: Experimental Technique and Set-upmentioning

confidence: 99%

See 1 more Smart Citation

Isotope shift and hyperfine structure of43Ca by laser spectroscopy

et al. 1979

Self Cite

View full text Add to dashboard Cite

show abstract

“…In many experiments and theoretical treatments the change of the ms radii Al'A2(~(r2) between two isotopes with mass numbers A 1 and A 2 is determined. For calcium the most accurate 6(r 2) values have been derived from optical isotope shifts [5] in the intercombination line 4s 2 1S o-4s 4p 3/'1, which was investigated by high resolution laser spectroscopy [8]. The results summarized in the first line of Table 1 will be the starting point for the discussion below.…”

Section: Introductionmentioning

confidence: 99%

On the charge distribution of calcium nuclei

Träger

1981

Z Physik A

View full text Add to dashboard Cite

The mean square charge radii and the quadrupole moments of Ca nuclei are discussed in the light of theoretical predictions. The very peculiar dependence of the charge radii on the mass number between double magic 4~ and double magic 48Ca can be ascribed to changes of the nuclear deformation, whereas the volume of the nuclear charge remains constant for all the Ca isotopes. Furthermore, correlations between nuclear charge radii and binding energies are discussed.

show abstract

“…Reflecting the laser beam back onto itself, Lamb-dips [13] have been observed in the Dopplerprofile of the signals including the hfs components of 41Ca. However, the dip-technique was generally not used for the measurements because the small linewidths of the Lamb-dips of 900 kHz [14] would require a very low scanning speed of the laser which was not desirable for this first experiment. The curves yield the isotope shift 4~ vis in the intercombination line as well as the hyperfine-structure splitting of the excited 4s 4p 3,ol state, of which the hfs constants A and B are: Due to the relatively large experimental error a comparison of this quadrupole moment with a theoretical value of Q= -0.051 b [16] should be left open until more precise data will be available.…”

mentioning

confidence: 97%

Nuclear charge distribution of41Ca

et al. 1979

Self Cite

View full text Add to dashboard Cite

The mean square nuclear charge radius of 41Ca equals the one of double magic 4~ within 0.006 fin.The nuclear charge and mass distribution of Ca nuclei 40 between the two double magic isotopes 20Ca20 and 48 2oCa2s has been the testing ground for practically all of the experimental methods to determine these quantities. Double magic 4~ has equal numbers of protons and neutrons and is considered extremely spherical.Addition of one neutron in the .1"7/2 shell yields information about the penetration or polarization of the 4~ core by a single nucleon. Incorporation of further neutrons or neutron pairs into the ./7/2 shell up to the closed configuration of double magic 4SCa opens the way for a study of changes in the radius of the Ca proton core if the neutron number is changed by as much as 40 %. In the sense outlined above, the long chain of stable nuclei of Ca can be regarded as a unique target for the study of the distribution of nuclear matter, in particular for light nuclei. The facts of (a) and (b) imply that, as the J7/2 shell is filled, these excess neutrons form a skin outside the 4~ core. The anomalous behaviour of (c) can be interpreted as a partial break up of the first fT/z neutron pair by the additional neutron which form altogether a layer of neutrons around the 4~ nucleus. In order to shed some more light on the peculiar trend of the Ca nuclear charge distributions it is indispensable to study the influence of a single neutron on the 4~ core. This paper reports such study, the determination of the nuclear charge radius of radio-41 active z0Cazl which was unknown so far. The charge distribution of 41Ca was measured via its optical isotope shift in a tuned dye laser spectroscopy experiment whose details have been described previously [2, ll, 12]. Advantages of the experimental technique applied here compared to other methods are that extremely small quantities of the isotope under investigation can be studied even in the presence of large quantities of other isotopes, and that additional information on the nuclear charge distribution can be obtained from the quadrupole moment Q, because the atomic hyperfine structure can be measured. The radioactive isotope 41Ca, which decays by electron capture to 41K with a half life of ~ = 1.3 -l0 s y, has been produced by neutron capture of 4~ Since the cross section for this process (a=0.40b) is rather small, a 41Ca-concentration of only one part in thousand could be obtained after a year of irradiation, even though a high flux of 3 9 1014 thermal neutrons cm-2 s-1 at the reactor facility in Mol/Belgium was used. The experimental technique applied here was sensitive to small amounts of 4~Ca (>10 4) in the presence of nearly 100 % 4~ and possible tiny impurities of other

show abstract

Saturation-dips in the weak calcium intercombination line

Cited by 12 publications

References 6 publications

Isotope shift and hyperfine structure of43Ca by laser spectroscopy

Isotope shift and hyperfine structure of43Ca by laser spectroscopy

On the charge distribution of calcium nuclei

Nuclear charge distribution of41Ca

Contact Info

Product

Resources

About