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Journal Articles

Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell

Sonoda, Tetsu*; Katayama, Ichiro*; Wada, Michiharu*; Iimura, Hideki; Sonnenschein, V.*; Iimura, Shun*; Takamine, Aiko*; Rosenbusch, M.*; Kojima, Takao*; Ahn, D. S.*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2019(11), p.113D02_1 - 113D02_12, 2019/11

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

An in-flight separator, BigRIPS, at RIBF in RIKEN provides each experiment with specific nuclides separated from many nuclides produced by projectile fragmentation or in-flight fission. In this process, nuclides other than separated ones are discarded on the slits in BigRIPS, although they include many nuclides interested from the view point of nuclear structure. In order to extract these nuclides for parasitic experiments, we are developing a method using laser ion-source (PALIS). A test experiment with $$^{78}$$Se beam from RIBF has been performed by using a gas cell set in BigRIPS. Unstable nuclides around $$^{67}$$Se were stopped in the gas cell in accordance with a calculation using LISE code. The stopping efficiency has been estimated to be about 30%. As a next step, we will establish the technique for extracting reaction products from the gas cell.

Journal Articles

The Laser and optical system for the RIBF-PALIS experiment

Sonoda, Tetsu*; Iimura, Hideki; Reponen, M.*; Wada, Michiharu*; Katayama, Ichiro*; Sonnenschein, V.*; Takamatsu, Takahide*; Tomita, Hideki*; Kojima, Takao*

Nuclear Instruments and Methods in Physics Research A, 877, p.118 - 123, 2018/01

 Times Cited Count:3 Percentile:40.19(Instruments & Instrumentation)

In order to produce low-energy RI beams at RIKEN RIBF, a laser ion source, PALIS, is under construction. This ion source is based on resonance ionization of RI atoms captured in Ar gas. Because the ion source is located 70m away from lasers, we have developed an optical system for laser beam transport. This system can be controlled remotely when the ion source is not accessible because of high radiation level. The position of laser beam after transport is reasonably stable, and the transport efficiency is about 50%.

Journal Articles

Isotope shifts of optical transitions in Ce II by collinear laser-ion-beam spectroscopy

Ishida, Y.*; ; ; *

Journal of Physics B; Atomic, Molecular and Optical Physics, 30(11), p.2569 - 2579, 1997/00

no abstracts in English

Journal Articles

Investigation of proton-rich platinum and mercury isotopes with the fragment mass analyzer at ATLAS and the isotope separator at UNISOR

K.S.Toth*; C.N.Davids*; Y.A.Akovali*; B.B.Back*; K.Bindra*; C.R.Bingham*; Carter, H. K.*; W.Chung*; ; D.J.Henderson*; et al.

Nuclei far from Stability/Atomic Masses and Fundamental Constants 1992, p.589 - 594, 1993/00

no abstracts in English

Journal Articles

Decay of $$^{123}$$Ba

; P.F.Mantica-Jr.*; B.E.Zimmerman*; W.B.Walters*; Carter, H. K.*

ORNL-6746, p.153 - 154, 1993/00

no abstracts in English

Oral presentation

Discovery of $$^{234m}$$Np isomer

Kamada, Hiroki*; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Toyoshima, Atsushi; Nagame, Yuichiro; Mitsukai, Akina; Tomitsuka, Tomohiro*; Andreyev, A.; Nishio, Katsuhisa; et al.

no journal, , 

Existence of the previously unknown isomer $$^{234m}$$Np was discovered for the first time. $$^{234m}$$Np was produced by using the JAEA tandem accelerator. Short-lived reaction products were mass-separated by the on-line isotope separator ISOL, and $$gamma$$ and X rays originating from the decay of $$^{234m}$$Np were observed. The half-life of $$^{234m}$$Np was determined to be approximately 9 min, and $$^{234m}$$Np was found to decay via the EC decay as well as the isomeric transition. On the basis of the observed $$gamma$$ and X rays and the half-life value, we have evaluated level energy, spin-parity, and proton-neutron configuration of $$^{234m}$$Np.

Oral presentation

Spontaneous fission measurements for neutron-rich Fm and Lr isotopes using $$^{254}$$Es target

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi*; Tomitsuka, Tomohiro*; Chiera, N. M.*; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro*; Nishio, Katsuhisa; et al.

no journal, , 

Neutron-rich fermium isotopes $$^{256}$$Fm and $$^{258}$$Fm and lawrencium isotope $$^{259}$$Lr were produced in the multinucleon transfer reaction on $$^{254}$$Es target with heavy-ion beam and in the heavy-ion fusion reaction on $$^{248}$$Cm target with $$^{15}$$N beam, respectively. Reaction products were mass-separated with an on-line isotope separator (ISOL), and spontaneous fission (SF) of these isotopes were measured. It was found that the mass distribution of the SF of $$^{256}$$Fm was asymmetric, while that of $$^{258}$$Fm was sharp symmetric, which confirmed the previous experimental results. On the other hand, the SF of $$^{259}$$Lr seemed to contain both symmetric and asymmetric mass distributions. On the basis of the present results of the mass and total kinetic energy distributions, we discussed the mechanism of fission for these isotopes.

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