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Journal Articles

Production of $$^{88}$$Nb and $$^{170}$$Ta for chemical studies of element 105, Db, using the GARIS gas-jet system

Huang, M.*; Haba, Hiromitsu*; Murakami, Masashi*; Asai, Masato; Kaji, Daiya*; Kanaya, Jumpei*; Kasamatsu, Yoshitaka*; Kikunaga, Hidetoshi*; Kikutani, Yuki*; Komori, Yukiko*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 304(2), p.845 - 849, 2015/05

https://doi.org/10.1007/s10967-014-3877-4
 Times Cited Count：3 Percentile：27.05(Chemistry, Analytical)

A technique to utilize radioisotopes of Nb and Ta was developed for chemical studies of element 105, Db, by coupling a gas-jet transport system to the RIKEN gas-filled recoil ion separator (GARIS). The short-lived $$^{88}$$Nb and $$^{170}$$Ta were produced with nuclear reactions using a $$^{19}$$F beam whose energy was the same as that to produce $$^{262}$$Db. Then, they were separated with GARIS and extracted to a chemistry laboratory with the gas-jet transport system. By changing only magnetic field of GARIS and inserting an energy degrader and a shutter for recoil ions, we could deliver the $$^{88}$$Nb and $$^{170}$$Ta to a chemistry device for $$^{262}$$Db without changing other experimental conditions.

Journal Articles

Production of $$^{262}$$Db in the $$^{248}$$Cm($$^{19}$$F,5$$n$$)$$^{262}$$Db reaction and decay properties of $$^{262}$$Db and $$^{258}$$Lr

Haba, Hiromitsu*; Huang, M.*; Kaji, Daiya*; Kanaya, Jumpei*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Murakami, Masashi*; Ozeki, Kazutaka*; Sakai, Ryutaro*; et al.

Physical Review C, 89(2), p.024618_1 - 024618_11, 2014/02

https://doi.org/10.1103/PhysRevC.89.024618
 Times Cited Count：25 Percentile：82.45(Physics, Nuclear)

Journal Articles

New result in the production and decay of an isotope, $$^{278}$$113 of the 113th element

Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sumita, Takayuki*; Wakabayashi, Yasuo*; Yoneda, Akira*; Tanaka, Kengo*; et al.

Journal of the Physical Society of Japan, 81(10), p.103201_1 - 103201_4, 2012/10

https://doi.org/10.1143/JPSJ.81.103201
 Times Cited Count：161 Percentile：97.32(Physics, Multidisciplinary)

An isotope of the 113th element, $$^{278}$$113, was produced in a nuclear reaction with a $$^{70}$$Zn beam on a $$^{209}$$Bi target. We observed six consecutive $$alpha$$ decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector, in extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of $$^{262}$$Db and $$^{258}$$Lr both in decay energies and decay times. This indicates that the present decay chain consisted of $$^{278}$$113, $$^{274}$$Rg (Z = 111), $$^{270}$$Mt (Z = 109), $$^{266}$$Bh (Z = 107), $$^{262}$$Db (Z = 105), and $$^{258}$$Lr (Z = 103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads the unambiguous production and identification of the isotope $$^{278}$$113, of the 113th element.

Journal Articles

Production of $$^{265}$$Sg in the $$^{248}$$Cm($$^{22}$$Ne,5$$n$$)$$^{265}$$Sg reaction and decay properties of two isomeric states in $$^{265}$$Sg

Haba, Hiromitsu*; Kaji, Daiya*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Ozeki, Kazutaka*; Sakai, Ryutaro*; Sumita, Takayuki*; Yoneda, Akira*; Kasamatsu, Yoshitaka*; et al.

Physical Review C, 85(2), p.024611_1 - 024611_11, 2012/02

https://doi.org/10.1103/PhysRevC.85.024611
 Times Cited Count：52 Percentile：91.81(Physics, Nuclear)

Two isomeric states in $$^{265}$$Sg, i.e, $$^{265}$$Sg$$^{a}$$ and $$^{265}$$Sg$$^{b}$$ were produced in the $$^{248}$$Cm($$^{22}$$Ne,5$$n$$) reaction. Decay properties of $$^{265}$$Sg$$^{a,b}$$ were investigated with a rotating-wheel apparatus for $$alpha$$ and spontaneous fission (SF) spectrometry under low background condition attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. Based on genetically correlated $$alpha$$-$$alpha$$ (-$$alpha$$) and $$alpha$$-SF decay chains, 18 and 24 events were assigned to $$^{265}$$Sg$$^{a}$$ and $$^{265}$$Sg$$^{b}$$, respectively. The half-life and $$alpha$$-particle energy of $$^{265}$$Sg$$^{a}$$ were measured to be $$8.5^{+2.6}_{-1.6}$$ s and $$8.84 pm 0.05$$ MeV, respectively, and those of $$^{265}$$Sg$$^{b}$$ were $$14.4^{+3.7}_{-2.5}$$ s and $$8.69 pm 0.05$$ MeV.

Journal Articles

Production and decay properties of $$^{264}$$Hs and $$^{265}$$Hs

Sato, Nozomi; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Kaji, Daiya*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Ozeki, Kazutaka*; Sumita, Takayuki*; Yoneda, Akira*; et al.

Journal of the Physical Society of Japan, 80(9), p.094201_1 - 094201_7, 2011/09

https://doi.org/10.1143/JPSJ.80.094201
 Times Cited Count：15 Percentile：65.9(Physics, Multidisciplinary)

Decay properties of $$^{264}$$Hs and $$^{265}$$Hs produced in the $$^{207,208}$$Pb($$^{58}$$Fe, $$xn$$) [$$x$$=1, 2] reactions were studied using a gas-filled recoil ion separator at the linear accelerator facility of RIKEN. A total of 6 decay chains were assigned to $$^{264}$$Hs. Cross sections for the $$^{264}$$Hs production in the $$^{208}$$Pb($$^{58}$$Fe,$$2n$$) and $$^{207}$$Pb($$^{58}$$Fe,$$n$$) reactions were measured to be $$2.8^{+6.5}_{-2.3}$$pb and $$6.9^{+4.4}_{-3.1}$$pb, respectively. The isotope $$^{264}$$Hs decayed with a half-life of $$0.751^{+0.518}_{-0.218}$$ms by $$alpha$$-particle emission and spontaneous fission. The $$alpha$$-particle energy of $$^{264}$$Hs was observed at 10.61$$pm$$0.04 and 10.80$$pm$$0.08 MeV. The spontaneous fission branch of $$^{264}$$Hs was found to be $$17^{+38}_{-14}%$$.

Journal Articles

Decay properties of $$^{266}$$Bh and $$^{262}$$Db produced in the $$^{248}$$Cm + $$^{23}$$Na reaction

Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sato, Nozomi*; Sumita, Takayuki*; Yoneda, Akira*; Ichikawa, Takatoshi*; et al.

Journal of the Physical Society of Japan, 78(6), p.064201_1 - 064201_6, 2009/06

https://doi.org/10.1143/JPSJ.78.064201
 Times Cited Count：30 Percentile：78.77(Physics, Multidisciplinary)

Decay properties of an isotope $$^{266}$$Bh and its daughter nucleus $$^{262}$$Db produced by the $$^{248}$$Cm($$^{23}$$Na,5$$n$$) reaction were studied by using a gas-filled recoil separator coupled with a position-sensitive semiconductor detector. $$^{266}$$Bh was clearly identified from the correlation of the known nuclide, $$^{262}$$Db. The obtained decay properties of $$^{266}$$Bh and $$^{262}$$Db are consistent with those observed in the $$^{278}$$113 chain, which provided further confirmation of the discovery of $$^{278}$$113.

Journal Articles

Production of a new hassium isotope $$^{263}$$Hs

Kaji, Daiya*; Morimoto, Koji*; Sato, Nozomi*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Ozeki, Kazutaka*; Haba, Hiromitsu*; Koura, Hiroyuki; Kudo, Yuki*; Ozawa, Akira*; et al.

Journal of the Physical Society of Japan, 78(3), p.035003_1 - 035003_2, 2009/03

https://doi.org/10.1143/JPSJ.78.035003

A new hassium isotopes $$^{263}$$Hs is directly produced for the first time. The experiment was performed at the linear accelerator (RILAC) facility in RIKEN (the Institute of Physical and Chemical Research) from Jun. 19 to 25. In the 25-h irradiation of $$^{58}$$Fe on $$^{206}$$Pb and 46-h irradiation of $$^{56}$$Fe on $$^{208}$$Pb, 8 decay chains and 1 decay chain, respectively, were observed. All decay chains were assigned to subsequent decays from $$^{263}$$Hs. The half-life of $$^{263}$$Hs is 0.60$$^{+0.30}_{-0.15}$$ ms. In this experiment, the total beam dose was $$4.1times10^{17}$$ ions for $$^{58}$$Fe and $$6.2times10^{17}$$ ions for $$^{56}$$Fe. The production cross section corresponding to 8 decay events and 1 decay chain was deduced to be 21$$^{+10}_{-8}$$ pb and 1.6$$^{+3.7}_{-1.3}$$ pb by assuming that the transmission of the system is 80%.

Journal Articles

Production and decay properties of $$^{263}$$Hs

Kaji, Daiya*; Morimoto, Koji*; Sato, Nozomi*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Ozeki, Kazutaka*; Haba, Hiromitsu*; Koura, Hiroyuki; Kudo, Yuki*; Ozawa, Akira*; et al.

Journal of the Physical Society of Japan, 78(3), p.035003_1 - 035003_2, 2009/03

https://doi.org/10.1143/JPSJ.78.035003
 Times Cited Count：3 Percentile：26.57(Physics, Multidisciplinary)

A new neutron deficient hassium ($$Z$$=108) isotope of $$^{263}$$Hs was identified via two different reactions of $$^{206}$$Pb($$^{58}$$Fe,n) and $$^{208}$$Pb($$^{56}$$Fe,n) by using a gas-filled recoil separator GARIS at June 2008. During the 25-h irradiation of $$^{206}$$Pb with the $$^{58}$$Fe beam and 46-h irradiation of $$^{208}$$Pb with the $$^{56}$$Fe beam, 8 decay chains and 1 decay chain, respectively, have been observed. The half-life of $$^{263}$$Hs is 0.60$$^{+0.30}_{0.15}$$ ms. In this experiment, the total beam doses of the Fe and $$^{56}$$Fe was 4.1$$times$$10$$^{17}$$ ions and 6.2$$times$$10$$^{17}$$ ions, respectively. The production cross sections corresponding to the 8 decay chains and 1 decay chain have been deduced to be 21$$^{+10}_{-8}$$ pb and 1.6$$^{+3.7}_{-1.3}$$ pb by assuming the transmission of the system to be 80%.

Journal Articles

New decay properties of $$^{264}$$Hs, $$^{260}$$Sg, and $$^{256}$$Rf

Sato, Nozomi*; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Kaji, Daiya*; Koura, Hiroyuki; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Ozawa, Akira*; et al.

RIKEN Accelerator Progress Report, Vol.42, P. 16, 2009/00

http://www.rarf.riken.jp/researcher/APR/Document/2008.pdf

New Decay Properties of $$^{264}$$Hs and its $$alpha$$-decay daughter nuclei were studied by using reactions of $$^{208}$$Pb($$^{58}$$Fe,2n) and $$^{207}$$Pb($$^{58}$$Fe,n) by using a gas-filled recoil ion separator, GARIS at RIKEN. We observed three correlated events in irradiation of $$^{58}$$Fe on $$^{208}$$Pb, and eight events in irradiation of $$^{58}$$Fe on $$^{207}$$Pb. A half-life was deduced to be 0.90$$^{+0.40}_{-0.20}$$. We assigned these eleven events to be the decays of $$^{264}$$Hs. We found different decay-chain events of $$^{264}$$Hs from a previous report. One is a long-lived $$alpha$$-decay of $$^{260}$$Sg with 180$$^{150}_{-60}$$ms of half-life. Another is a long-lived $$alpha$$-decay of $$^{256}$$Rf with 10.4$$^{8.4}_{-3.2}$$s of half-life. For $$^{260}$$Sg and $$^{256}$$Rf, the decay of such a long-lived state have not been reported. These are the first observations of isomerism in $$^{260}$$Sg and $$^{256}$$Rf.

Journal Articles

Attempt to produce the 3rd chain of $$^{278}$$113

Morimoto, Koji*; Morita, Kosuke*; Kaji, Daiya*; Akiyama, Takahiro*; Goto, Shinichi*; Haba, Hiromitsu*; Ideguchi, Eiji*; Katori, Kenji*; Koura, Hiroyuki; Kudo, Hisaaki*; et al.

RIKEN Accelerator Progress Report, Vol.42, P. 15, 2009/00

http://www.rarf.riken.jp/researcher/APR/Document/2008.pdf

In 2003-2007, we had performed an experiment to synthesize an element 113 by a $$^{209}$$Bi$$+$$ $$^{70}$$Zn reaction using a gas-filled recoil ion separator (GARIS) at RIKEN Nishina-Center. In a total of 241 days of net irradiation time experiment, two decay chains were observed and assigned from an isotope $$^{278}$$113. The cross section of the $$^{209}$$Bi($$^{70}$$Zn,n)$$^{278}$$113 reaction was determined to be 31$$^{+40}_{-20}$$ fb at that time. In order to increase the statistics of the decay property, we continued to produce more decay chains. The experiment was carried out from January 7 to March 31, 2008. The experimental conditions were identical to those used in the previous experiment. $$^{70}$$Zn ion beam of 353 MeV was extracted from RILAC. The net irradiation time was 83 days and the total dose of $$^{70}$$Zn was 2.28$$times10^{19}$$. In the present expriment any candidate of $$^{278}$$113 was not observed. Then combining the results of the present and previous experiments, the production cross section of $$^{278}$$113 was determined to be 22$$^{+29}_{-19}$$ fb.

Oral presentation

Productions and decay properties of $$^{264,265}$$Hs

Sato, Nozomi; Kaji, Daiya*; Morimoto, Koji*; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Koura, Hiroyuki; Kudo, Yuki*; Ozawa, Akira*; Ozeki, Kazutaka*; et al.

no journal, , 

In this work, the production and decay properties of $$^{264,265}$$Hs produced in the $$^{208}$$Pb($$^{58}$$Fe, $$xn$$) [$$x = 1,2$$] and $$^{207}$$Pb($$^{58}$$Fe, $$n$$) reactions were investigated. The experiment was performed at the RILAC facility in RIKEN. The evaporation residues (ERs) were separated from the primary beam with the gas-filled recoil ion separator, GARIS. In the focal plane of GARIS the products were implanted into a position-sensitive Si detector for measuring the arrival of ERs and subsequent $$alpha$$-decays or spontaneous fission from ERs. We have measured production cross-sections of $$^{264,265}$$Hs in the $$^{58}$$Fe + $$^{208}$$Pb reaction at several bombarding energies. For the $$^{208}$$Pb($$^{58}$$Fe, $$n$$)$$^{265}$$Hs reaction, the cross-section maximum of ($$51^{+46}_{-29}$$) pb was obtained at the bombarding energy of 220.5 MeV at the middle of the target. For even-even nucleus $$^{264}$$Hs, we have also observed accurate decay data with good statistics.

Oral presentation

Production of $$^{261}$$Rf for chemical studies using the gas-jet transport system coupled to GARIS

Haba, Hiromitsu*; Oe, Kazuhiro*; Ozeki, Kazutaka*; Kasamatsu, Yoshitaka*; Kaji, Daiya*; Kudo, Yuki*; Komori, Yukiko*; Sato, Nozomi; Shinohara, Atsushi*; Morita, Kosuke*; et al.

no journal, , 

A gas-jet transport system for superheavy element chemistry has been coupled to the gas-filled recoil ion separator GARIS at the RIKEN linear accelerator. In this work, we have investigated the performance of the system using $$^{261}$$Rf produced in the $$^{248}$$Cm($$^{18}$$O,5$$n$$)$$^{261}$$Rf reaction. The present result demonstrates that the GARIS/gas-jet system is a promising approach to explore new frontiers in SHE chemistry: (1) the background radioactivities originating from unwanted reaction products are strongly suppressed, (2) the intense primary heavy-ion beam is absent in the gas-jet chamber, and hence high gas-jet transport efficiency is achieved, and (3) the beam-free conditions also make it possible to investigate new chemical systems that were not accessible before.

Oral presentation

Productions and decay properties of a new isotope of $$^{263}$$Hs

Kaji, Daiya*; Morimoto, Koji*; Sato, Nozomi; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Koura, Hiroyuki; Kudo, Yuki*; Ozawa, Akira*; Ozeki, Kazutaka*; et al.

no journal, , 

A new neutron deficient hassium ($$Z=108$$) isotope of $$^{263}$$Hs was identified via two different reactions of $$^{206}$$Pb($$^{58}$$Fe,$$n$$) and $$^{208}$$Pb($$^{56}$$Fe,$$n$$) by using the gas-filled recoil separator GARIS. During irradiation of $$^{206}$$Pb with the $$^{58}$$Fe beam and irradiation of $$^{208}$$Pb with the $$^{56}$$Fe beam, 8 decay chains and 1 decay chain, respectively, were observed. The properties of decay events obtained by irradiation of $$^{58}$$Fe on $$^{206}$$Pb match well with those by irradiation of $$^{56}$$Fe on $$^{208}$$Pb. The mean $$alpha$$-decay energies for the 3 groups are 10.82, 10.55, and 10.37 MeV, respectively. The half-life of $$^{263}$$Hs is determined to be 0.60 ms.

Oral presentation

Production and decay properties of $$^{266}$$Bh and its daughter nuclei

Morimoto, Koji*; Morita, Kosuke*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sato, Nozomi; Sumita, Takayuki*; Yoneda, Akira*; Ichikawa, Takatoshi*; et al.

no journal, , 

A nuclide, $$^{266}$$Bh, is the great-grand-daughter of $$^{278}$$113 that is produced in the $$^{209}$$Bi + $$^{70}$$Zn reaction. The identification was based on a genetic link to the known daughter nucleus $$^{262}$$Db by alpha-decays. The main purpose of this work is to provide further confirmation of the production and identification of the isotope $$^{278}$$113. As a present result, a state in $$^{266}$$Bh, which decays by an alpha emission with the energies ranging from 9.05 to 9.23 MeV, feeds a state in $$^{262}$$Db, which decays by alpha emission and by SF with a previously known half-life. The result provided a further confirmation of the production and identification of the isotope of the 113th element, $$^{278}$$113, studied by a research group at RIKEN.

Oral presentation

Production and decay properties of $$^{266}$$Bh and its daughter nuclei

Morimoto, Koji*; Morita, Kosuke*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sato, Nozomi; Sumita, Takayuki*; Yoneda, Akira*; Ichikawa, Takatoshi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Productions and decay properties of a new isotope of $$^{263}$$Hs

Kaji, Daiya*; Morimoto, Koji*; Sato, Nozomi; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Koura, Hiroyuki; Kudo, Yuki*; Ozawa, Akira*; Ozeki, Kazutaka*; et al.

no journal, , 

no abstracts in English

Oral presentation

Production and decay properties of $$^{263,264,265}$$Hs

Sato, Nozomi; Kaji, Daiya*; Morimoto, Koji*; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Koura, Hiroyuki; Kudo, Yuki*; Ozawa, Akira*; Ozeki, Kazutaka*; et al.

no journal, , 

In the superheavy nuclei region, the deformed proton shell at $$Z=108$$ and neutron shells at $$N=152$$ and 162 have been found. $$^{260}$$Hs with $$Z=108$$ and $$N=152$$ is expected to be the doubly deformed magic nuclei, however, decay properties of $$^{260}$$Hs and its neighboring nuclei is not well known. In order to approach $$^{260}$$Hs, we synthesized $$^{263,264,265}$$Hs by $$^{208}$$Pb($$^{58}$$Fe,xn) [$$x=1, 2$$], $$^{207}$$Pb($$^{58}$$Fe,n), $$^{206}$$Pb($$^{58}$$Fe,n), $$^{208}$$Pb($$^{56}$$Fe,n) reactions. The experiment was performed with the gas-filled recoil ion separator GARIS at the linear accelerator facility in RIKEN. In this work, 9 $$alpha$$-decay events of $$^{263}$$Hs were observed with half-life $$T_{1/2}=0.60^{+0.30}_{-0.15}$$ ms and $$alpha$$-decay energy $$Q_{alpha}=10.99$$ MeV. For $$^{264}$$Hs, we have also observed new $$alpha$$-particle energy, 10.65 MeV. $$Q_{alpha}$$ values of $$^{263,264,265}$$Hs isotopes increase with decreasing neutron number.

Oral presentation

Observation of new neutron-deficient actinide isotopes of $$^{234}$$Bk and $$^{230}$$Am

Kaji, Daiya*; Haba, Hiromitsu*; Kasamatsu, Yoshitaka*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Ozeki, Kazutaka*; Sumita, Takayuki*; Yoneda, Akira*; Koura, Hiroyuki; et al.

no journal, , 

no abstracts in English

Oral presentation

Production of $$^{265}$$Sg via the $$^{248}$$Cm($$^{22}$$Ne,5$$n$$)$$^{265}$$Sg reaction

Haba, Hiromitsu*; Oe, Kazuhiro*; Ozeki, Kazutaka*; Kasamatsu, Yoshitaka*; Kaji, Daiya*; Kikunaga, Hidetoshi*; Kudo, Hisaaki*; Kudo, Yuki*; Komori, Yukiko*; Sato, Nozomi; et al.

no journal, , 

RIKEN group has investigated the performance of the system using an isotope of element 106, $$^{265}$$Sg, produced in the $$^{248}$$Cm($$^{22}$$Ne,5$$n$$) reaction. Alpha-particles of $$^{265}$$Sg separated with a GAs-filled Recoil Ion Separator (GARIS) and extracted to a chemistry laboratory were successfully identified with a rotating wheel system for $$alpha$$-spectrometry under low background conditions. As a result, two isomeric states in $$^{265}$$Sg, $$^{265a}$$Sg ($$alpha$$-particle energy $$E_{alpha} = 8.84$$ MeV, half-life $$T_{1/2} = 6.7$$ s) and $$^{265b}$$Sg ($$E_{alpha} = 8.69$$ MeV, $$T_{1/2} = 15$$ s), were identified. The cross sections for the $$^{248}$$Cm($$^{22}$$Ne,5$$n$$) reactions at 118 MeV were roughly evaluated to be 200 pb for $$^{265a}$$Sg and 170 pb for $$^{265b}$$Sg.

Oral presentation

GARIS-II commissioning, 1

Kaji, Daiya*; Haba, Hiromitsu*; Kasamatsu, Yoshitaka*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Ozeki, Kazutaka*; Sumita, Takayuki*; Yoneda, Akira*; Sato, Nozomi; et al.

no journal, , 

RIKEN group has been developing a new gas-filled recoil ion separator GARIS-II for research of superheavy element produced by actinide-based asymmetric fusion (hot fusion) reactions. The GARIS-II consists of five magnets with a Q-D-Q-Q-D configuration. Where, D and Q are dipole and quadrupole magnets, respectively. The test of GARIS-II was performed with the $$^{241}$$Am standard $$alpha$$-source and 0$$^{circ}$$ scattered ions from the $$^{208}$$Pb target. A solid angle of GARIS-II was measured to be about 18.4 msr, which was almost as same as a calculated value with the TRANSPORT cord. The image size at focal plane versus He-gas pressure in GARIS-II chamber was also measured with $$^{208}$$Pb ions.

23 (Records 1-20 displayed on this page)