KISS

In-gas-cell laser ionization spectroscopy at KISS

Yoshikazu Hirayama, Momo Mukai, Yutaka Watanabe, Peter Schury, Toshitaka Niwase, Hyunsuk Choi, Takashi Hashimoto, Shun Iimura, SunChan Jeong, Hiroari Miyatake, JunYoung Moon, Hitoshi Nakada, Michihiro Oyaizu, Marco Rosenbusch, Aiko Takamine, Minori Tajima, Akihiro Taniguchi, and Michiharu Wada

doi: 10.1007/s10751-024-01886-1

abstract

We have developed the KEK Isotope Separation System (KISS) at RIKEN to study the nuclear structure of the nuclei in the vicinity of neutron magic number N=126 from the astrophysical perspective. These neutron-rich nuclei have been produced by using multinucleon transfer (MNT) reactions with combinations of the low-energy ¹²⁶Xe beam and the production targets of W, Ir, and Pt. At the KISS facility, radioisotopes are ionized by applying in-gas-cell laser ionization technique. In this process, we can perform laser ionization spectroscopy of the refractory elements with the atomic number Z=70–78 such as Hf, Ta, W, Re, Os, Ir, and Pt, which cannot be performed in other facilities. Laser spectroscopy can effectively investigate nuclear structure through the measured magnetic moments, isotope shifts (IS) Δν, changes in the mean-square charge radii δ<r²>, and quadrupole deformation parameters |<β²>|^1/2. We have studied the ionization schemes of these elements through offline tests and performed in-gas-cell laser ionization spectroscopy of these refractory neutron-rich nuclei produced at KISS.

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope ¹⁹⁹Pt

Y. Hirayama et al.
doi: 10.1103/PhysRevC.96.014307

The magnetic dipole moment and mean-square charge radius of $199 g Pt$ $(I^{π} =$ $5 / 2^{-}, t_{1 / 2} = 30.8$ min) ground state and $199 m Pt$ $(E_{ex} = 424$ keV, $I^{π} =$ (13/2) $^{+}, t_{1 / 2} = 13.6$ s) isomeric state are evaluated for the first time from investigations of the hyperfine splitting of the $λ_{1} = 248.792$ nm transition by in-gas-cell laser ionization spectroscopy. Ground and isomeric states of neutron-rich $199 Pt$ nucleus were produced by a multinucleon transfer reaction at the KEK Isotope Separation System (KISS), designed for the study of nuclear spectroscopy in the vicinity of $N = 126$ . The measured magnetic dipole moments $+ 0.75$ (8) $μ_{N}$ and $- 0.57$ (5) $μ_{N}$ are consistent with the systematics of those of nuclei with $I^{π} =$ $5 / 2^{-}$ and $I^{π} =$ $13 / 2^{+}$ , respectively.

[conf] In-gas-cell laser ionization spectroscopy at KISS

In-gas-cell laser ionization spectroscopy at KISS

abstract

[paper] In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope ¹⁹⁹Pt

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In-gas-cell laser ionization spectroscopy at KISS

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