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Journal Articles

Nuclear moments and isotope shifts of $$^{135}$$La, $$^{137}$$La and $$^{138}$$La by collinear laser spectroscopy

Iimura, Hideki; Koizumi, Mitsuo; Miyabe, Masabumi; Oba, Masaki; Shibata, Takemasa; Shinohara, Nobuo; Ishida, Yoshihisa*; Horiguchi, Takayoshi*; Schuessler, H. A.*

Physical Review C, 68(5), p.054328_1 - 054328_7, 2003/11

 Times Cited Count:10 Percentile:58.13(Physics, Nuclear)

no abstracts in English

Oral presentation

Nuclear moments of the radioactive isotope $$^{131}$$La determined by collinear fast-beam laser spectroscopy

Iimura, Hideki; Schuessler, H. A.*; Buchinger, F.*; Cocolios, T.*; Crawford, J. E.*; Gulick, S.*; Lee, J. K. P.*; Levy, C. D. P.*; Pearson, M.*; Lioubimov, V.*; et al.

no journal, , 

We report measurements of the hyperfine structure constants of $$^{131}$$La (N=74) as an initial step to further exploring the neutron deficient rare-earth region where a sudden onset of nuclear deformation is predicted theoretically around N=74. This work is an extension of our earlier off-line experiments on $$^{135,137-139}$$La to on-line laser spectroscopy. The radioactive isotope $$^{131}$$La (T$$_{1/2}$$=59 min) was produced by means of a spallation reaction using a proton beam from TRIUMF cyclotron. The hyperfine spectra were observed by using the method of collinear fast-beam laser spectroscopy. From the obtained hyperfine constants, the nuclear moments of $$^{131}$$La were derived. In order to arrive at an understanding of the nuclear structure of $$^{131}$$La, we have carried out particle triaxial-rotor calculations. The results from the calculation reproduce well the experimental values when a triaxial shape is assumed for $$^{131}$$La.

Oral presentation

Laser spectroscopy of the neutron deficient La isotopes

Iimura, Hideki; Buchinger, F.*; Crawford, J. E.*; Gulick, S.*; Cocolios, T. E.*; Colomenski, A.*; Fahes, M.*; Schuessler, H. A.*

no journal, , 

no abstracts in English

Oral presentation

Development of collinear laser spectroscopy system to measure quadrupole deformation Parameters of unstable nuclei, 2

Tajima, Minori*; Takamine, Aiko*; Iimura, Hideki; Wada, Michiharu*; Schuessler, H. A.*; Ueno, Hideki*

no journal, , 

Collinear laser spectroscopy is widely used to measure the isotope shifts and the hyperfine structures of unstable nuclei, from which the change of charge radii and the electromagnetic moments of these nuclei are deduced. However, radioisotopes of refractory elements have not been measured, because it is difficult to generate the ion beams necessary for collinear laser spectroscopy. Recently, SLOWRI has been constructed at RIKEN RI beam facility (RIBF), which can afford the ion beams of radioisotopes of all elements. We are developing a collinear laser spectroscopy setup at SLOWRI. We have confirmed that the reference values of the isotope shifts and the hyperfine structure constants of stable Ba isotopes were obtained. Since the intensities of radioisotopes are much lower than those of stable isotopes, improvement of sensitivity by using such as ion-photon coincidence is now in progress.

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