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Journal Articles

$$alpha$$-decay branching ratio of $$^{180}$$Pt

Cubiss, J. G.*; Harding, R. D.*; Andreyev, A. N.; Althubiti, N.*; Andel, B.*; Antalic, S.*; Barzakh, A. E.*; Cocolios, T. E.*; Day Goodacre, T.*; Farooq-Smith, G. J.*; et al.

Physical Review C, 101(1), p.014314_1 - 014314_4, 2020/01

 Times Cited Count:5 Percentile:84.86(Physics, Nuclear)

The $$alpha$$-decay branching ratio of 0.52(5)% from the ground state of $$^{180}$$Pt to the ground state of the daughter nucleus $$^{176}$$Os has been determined more precisely than before. The $$^{180}$$Pt was produced as the $$beta$$-decay granddaughter of $$^{180}$$Hg which was produced and separated with the CERN-ISOLDE facility. The reduced $$alpha$$-decay width calculated with the present result has provided a new picture of the systematics for the $$alpha$$-decay width of neutron-deficient Pt isotopes.

Journal Articles

Fine structure in the $$alpha$$ decay of $$^{223}$$U

Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.

Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01

 Times Cited Count:6 Percentile:89.19(Astronomy & Astrophysics)

Journal Articles

Fine structure in the $$alpha$$ decay of $$^{218}$$At

Cubiss, J. G.*; Andreyev, A. N.; Barzakh, A. E.*; Andel, B.*; Antalic, S.*; Cocolios, T. E.*; Day Goodacre, T.*; Fedorov, D. V.*; Fedosseev, V. N.*; Ferrer, R.*; et al.

Physical Review C, 99(6), p.064317_1 - 064317_6, 2019/06

 Times Cited Count:5 Percentile:69.53(Physics, Nuclear)

An $$alpha$$ decay of $$^{218}$$At was studied at the CERN-ISOLDE facility using a laser-ionization technique. Coincidence $$alpha$$-$$gamma$$ data were collected for the first time and a more precise half-life value of T$$_{1/2}$$ = 1.27(6) s was measured. A new $$alpha$$-decay scheme was deduced based on the fine-structure of the $$alpha$$ decay. The results lead to a preferred spin and parity assignment of J$$_{pi}$$ = (3$$^{-}$$) for the ground state of $$^{218}$$At; however, J$$_{pi}$$ = (2)$$^{-}$$ cannot be fully excluded.

Journal Articles

Alpha decay and beta-delayed fission; Tools for nuclear physics studies

Van Duppen, P.*; Andreyev, A. N.

The Euroschool of Exotic Beams, Vol.5, p.65 - 116, 2018/04

Journal Articles

Recoil-$$alpha$$-fission and recoil-$$alpha$$-$$alpha$$-fission events observed in the reaction $$^{48}$$Ca + $$^{243}$$Am

Forsberg, U.*; Rudolph, D.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, Ch. E.*; Fahlander, C.*; Gates, J. M.*; Golubev, P.*; Gregorich, K. E.*; Gross, C. J.*; et al.

Nuclear Physics A, 953, p.117 - 138, 2016/09

 Times Cited Count:32 Percentile:93.48(Physics, Nuclear)

Alpha-decay chains observed in the element-115 production reactions of $$^{48}$$Ca + $$^{243}$$Am were investigated using a new data set consisting of our recently reported data obtained at GSI and previously reported ones at Dubna and LBNL. Short decay chains of recoil-$$alpha$$-($$alpha$$)-fission type, fourteen of which were observed, and some of which were interpreted as the 2-neutron evaporation products $$^{289}$$Mc, have been reassigned. It is plausible that most of them were assigned to the 3-neutron evaporation products $$^{288}$$Mc whose decay chain would on the way have branches of EC decays followed by fission.

Journal Articles

$$alpha$$-decay study of $$^{182,184}$$Tl

Van Beveren, C.*; Andreyev, A.; Barzakh, A. E.*; Cocolios, T. E.*; de Groote, R. P.*; Fedorov, D.*; Fedosseev, V. N.*; Ferrer, R.*; Ghys, L.*; Huyse, M.*; et al.

Journal of Physics G; Nuclear and Particle Physics, 43(2), p.025102_1 - 025102_22, 2016/02

 Times Cited Count:11 Percentile:71(Physics, Nuclear)

Journal Articles

Nuclear structure of elements with $$100 le Z le 109$$ from alpha spectroscopy

Asai, Masato; He${ss}$berger, F. P.*; Lopez-Martens, A.*

Nuclear Physics A, 944, p.308 - 332, 2015/12

 Times Cited Count:39 Percentile:94.56(Physics, Nuclear)

Nuclear structure of Z = 100-109 nuclei studied through $$alpha$$-decay spectroscopy have been reviewed. Experimental techniques and methods concerning separation techniques, summing effects in $$alpha$$ spectra, and the use of digital electronics for $$alpha$$-decay spectroscopy have been described in detail. The presentation of the experimental results and the physics discussion were focused on nuclear structure systematics in even-Z nuclei along the N = 151, 153, and 155 isotonic lines, where most progress has been achieved in the last 10 years.

Journal Articles

EC and $$alpha$$ decays of $$^{235}$$Am

Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu*; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.

European Physical Journal A, 22(3), p.411 - 416, 2004/12

 Times Cited Count:8 Percentile:49.41(Physics, Nuclear)

EC and $$alpha$$ decays of $$^{235}$$Am have been studied by means of $$gamma$$-ray spectroscopy. Excited states in $$^{235}$$Pu have been established for the first time, and tentative spin-parity and Nilsson assignments were given to these levels. The ground state of $$^{235}$$Am was evaluated to be the $$pi 5/2^{-}[523]$$ state from the experimental results. It was found that the $$pi 5/2^{-}[523]$$ state in $$^{231}$$Np is located at $$<$$15~keV, which allowed us to determine the $$Q_{alpha}$$ value of $$^{235}$$Am as 6569$$^{+27}_{-12}$$~keV, in combination with the measured $$alpha$$-particle energy.

Journal Articles

Measurements of EC and weak $$alpha$$ decays of neutron-deficient transuranium isotopes

Asai, Masato; Sakama, Minoru; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi; Kojima, Yasuaki*; Oura, Yasuji*; et al.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.474 - 477, 2002/08

Neutron-deficient americium and curium isotopes with half-lives $$leq$$10 min have been produced with the tandem accelerator, and their EC and weak $$alpha$$ decays have been successfully measured through an on-line isotope separation. Decay schemes of $$^{235,236}$$Am have been established, and proton-neutron configurations in the parent and daughter nuclei have been determined. Observed $$alpha$$ transitions in $$^{233,235}$$Am were found to be the favored transitions between the $$pi 5/2^{-}[523]$$ Nilsson states. Information on nuclear structure, deformation, and atomic masses in this region were obtained.

Journal Articles

Decay studies of neutron-deficient Am, Cm, and Bk nuclei using an on-line isotope separator

Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Akiyama, Kazuhiko; Toyoshima, Atsushi; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.187 - 190, 2002/06

EC and $$alpha$$ decays of neutron-deficient americium, curium, and berkelium nuclei have been studied using the JAERI on-line isotope separator. Decay schemes of $$^{235, 236}$$Am have been established for the first time, and proton-neutron configurations in $$^{235, 236}$$Am and $$^{235, 236}$$Pu have been determined. $$alpha$$ transitions observed in $$^{233, 235}$$Am were found to be the favored transitions between the $$pi 5/2^{-}[523]$$ Nilsson states. $$Q_{alpha}$$ values of $$^{237, 238}$$Cm have been determined. Nuclear structure, deformation, and atomic masses for these nuclei were discussed.

Journal Articles

Recent results from the JAERI recoil mass separator

Mitsuoka, Shinichi; Ikezoe, Hiroshi; Ikuta, T.*; Hamada, Shingo; Nagame, Yuichiro; Tsukada, Kazuaki; Nishinaka, Ichiro; Otsuki, Tsutomu*

Journal of Radioanalytical and Nuclear Chemistry, 239(1), p.155 - 157, 1999/00

 Times Cited Count:0 Percentile:0.01(Chemistry, Analytical)

no abstracts in English

Journal Articles

Experiment and analysis on in-vessel debris coolability in ALPHA program

Maruyama, Yu; ; Moriyama, Kiyofumi; H.S.Park*; Kudo, Tamotsu; Y.Yang*; Sugimoto, Jun

JAERI-Conf 98-009, p.100 - 106, 1998/00

no abstracts in English

Journal Articles

$$alpha$$-decay properties of the new neutron deficient isotope $$^{212}$$Pa

Mitsuoka, Shinichi; Ikezoe, Hiroshi; *; Nagame, Yuichiro; Tsukada, Kazuaki; ; Oura, Yasutsugu*

Physical Review C, 55(3), p.1555 - 1558, 1997/03

 Times Cited Count:27 Percentile:80.25(Physics, Nuclear)

no abstracts in English

Journal Articles

$$alpha$$ decay of a new isotope $$^{209}$$Th

Ikezoe, Hiroshi; *; Hamada, S.; Nagame, Yuichiro; ; Tsukada, Kazuaki; Oura, Yasutsugu*

Physical Review C, 54(4), p.2043 - 2046, 1996/10

 Times Cited Count:21 Percentile:73.8(Physics, Nuclear)

no abstracts in English

Journal Articles

1.5,Nuclear spectroscopy

Sekine, Toshiaki

Dai-4-Pan Jikken Kagaku Kouza, 14; Kaku, Hoshasen, p.83 - 111, 1992/00

no abstracts in English

Journal Articles

Unified theory of alpha decay

; E.A.Rauscher*

Phys.Rev., 169(4), p.818 - 824, 1968/00

no abstracts in English

Oral presentation

New additional experiments of $$alpha$$-decay spectroscopy for $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke*; Shibata, Michihiro*; Shima, Yosuke*

no journal, , 

We have performed $$alpha$$-$$gamma$$ coincidence and high-resolution $$alpha$$-fine structure spectroscopy for $$^{261}$$Rf, and have obtained new information on nuclear structure of $$^{261}$$Rf. We have confirmed the existence of two $$gamma$$ transitions following the $$alpha$$ decay, and have succeeded in determining the $$alpha$$-transition energy very accurately. On the basis of these experimental results, we have estimated the spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

Oral presentation

Alpha-decay spectroscopy of $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke; Shima, Yosuke*; Shibata, Michihiro*

no journal, , 

Alpha-gamma coincidence and high-resolution $$alpha$$ fine-structure measurements were performed for the $$alpha$$ decay of $$^{261}$$Rf. Two $$gamma$$ lines associated with the $$alpha$$ decay of $$^{261}$$Rf were clearly observed, and more precise $$alpha$$-energy spectrum than before were obtained. It was found that the literature value (8.28 MeV) of the $$alpha$$-transition energy of $$^{261}$$Rf was incorrect, and that the $$alpha$$-decay scheme of $$^{261}$$Rf should contain several low-energy cascade $$gamma$$ transitions. On the basis of these results and literature data of $$^{261m}$$Rf, we will discuss nuclear structure of superheavy nuclei around this region as well as the level structure of $$^{261}$$Rf and its daughter nucleus $$^{257}$$No.

Oral presentation

Alpha decay of $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke*; Shima, Yosuke*; Shibata, Michihiro*

no journal, , 

We have obtained new experimental data for nuclear structure of $$^{261}$$Rf through $$alpha$$-decay spectroscopy. We have reconfirmed existence of two $$gamma$$ transitions in the $$alpha$$ decay of $$^{261}$$Rf through $$alpha$$-$$gamma$$ coincidence measurement, and determined the $$alpha$$-transition energy very precisely through high-resolution $$alpha$$-fine structure measurement. On the basis of these experimental results, we have estimated spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

Oral presentation

Fine-structure $$alpha$$-decay spectroscopy of superheavy nuclei

Asai, Masato

no journal, , 

To investigate nuclear structure of superheavy nuclei experimentally, spectroscopic methods which can reveal level structure of ground- and excited states are the most effective. In particular, fine-structure $$alpha$$-decay spectroscopy is expected to be a very sensitive method because spectroscopic information can be obtained only through $$alpha$$-particle measurements. However, it is difficult to measure $$alpha$$ particles of superheavy nuclei with high energy resolution. Moreover, the observed $$alpha$$ energy spectra are significantly distorted by coincidence summing effects. I would like to demonstrate how we can overcome these difficulties, and how useful the fine-structure $$alpha$$-decay spectroscopy is to investigate nuclear structure of superheavy nuclei.

21 (Records 1-20 displayed on this page)