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Journal Articles

Production of $$^{186 rm m}$$Re by proton bombardment of enriched $$^{186}$$W

Iimura, Hideki; Horiguchi, Takayoshi*; Ishida, Yoshihisa*; Ito, Mitsuo; Koizumi, Mitsuo; Miyabe, Masabumi; Oba, Masaki

Journal of the Physical Society of Japan, 77(2), p.025004_1 - 025004_2, 2008/02

https://doi.org/10.1143/JPSJ.77.025004
 Times Cited Count：1 Percentile：11.66(Physics, Multidisciplinary)

The nucleus $$^{186 rm m}$$Re is of interest from the astrophysical point of view, since production of this nucleus in stars could change an accuracy of nucleo-cosmochronometer. In order to calculate the neutron capture cross section theoretically, it is necessary to know the spin of nucleus. However, the spin of $$^{186 rm m}$$Re has not been established so far. In order to clarify the nuclear structure of this nucleus, we plan laser spectroscopy of $$^{186 rm m}$$Re, and first, we measured the production yield of the ($$p,n$$) reaction. The experiment was carried out by irradiating a $$^{186}$$W target with a proton beam from the JAEA tandem accelerator. Rhenium was chemically separated from the irradiated sample, and then $$gamma$$-ray measurements were performed. As a result, we determined the production yield of the $$^{186}$$W($$p,n$$)$$^{186 rm m}$$Re reaction for the first time and suggested the same spin for $$^{186 rm m}$$Re as the known spin of $$I$$=8 for $$^{184 rm m}$$Re.

Oral presentation

Nuclear moments studied by collinear laser spectroscopy

Iimura, Hideki

no journal, , 

Hyperfine structures of transitions in ions of the radioactive lanthanum isotopes have been measured by collinear laser spectroscopy. From the obtained hyperfine-structure-coupling constants, moments of these nuclei have been determined. By comparing these moments with the theoretical ones calculated on the basis of Nilsson model, it has been found that there is significant disagreement between theoretical and experimental values of the quadrupole moment of $$^{131}$$La. It has already been predicted theoretically from the potential energy surfaces calculation using Woods-Saxon potential that the La nuclei around A=130 are largely triaxial. Because the triaxial deformation is not taken into consideration in the Nilsson model, the discrepancy could be attributed to the axially symmetric character of this model. A hyperfine structure anomaly found between $$^{139}$$La and $$^{138}$$La is also discussed.

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