研究目的
Investigating the accuracy of in-source laser photoionization spectroscopy and methods for data analysis in the study of neutron-deficient Bi isotopes.
研究成果
The study demonstrated the application of in-source laser photoionization spectroscopy to neutron-deficient Bi isotopes, discussing data analysis and accuracy-related aspects. The integration method for nuclear spin determination in partially resolved hyperfine spectra was detailed, showing good agreement with theoretical predictions for isotopes with relatively low spin.
研究不足
The resolution of in-source spectroscopy is limited by the Doppler broadening of atomic transitions in the hot-cavity ion source. The integration method for nuclear spin determination is better applied for isotopes with low spin (I < 3).
1：Experimental Design and Method Selection:
The study utilized in-source laser photoionization spectroscopy to investigate neutron-deficient Bi isotopes. The method involved a three-step laser-ionization scheme for bismuth, with detailed procedures for each step.
2：Sample Selection and Data Sources:
Neutron-deficient Bi isotopes were produced through spallation reactions induced by a 1.4 GeV proton beam on a UCx target at the ISOLDE facility (CERN).
3：4 GeV proton beam on a UCx target at the ISOLDE facility (CERN).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a titanium sapphire (Ti:Sa) laser, a broadband DMK MSS dye laser, a solid-state Nd:YVO4 laser, and High-Finesse( ?Angstrom) WS7 wavelength meters for monitoring and control.
4：Experimental Procedures and Operational Workflow:
The bismuth atoms were resonantly ionized within the cavity of the Resonance Ionization Laser Ion Source (RILIS) using the three-step ionization scheme. The photoion current was monitored after mass separation using various detectors.
5：Data Analysis Methods:
The experimental optical spectra were fitted with a convolution of a Gaussian Doppler profile and the probability of photoionization, accounting for saturation effects and hyperfine structure components.
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