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Konki, J.*; Khuyagbaatar, J.*; Uusitalo, J.*; Greenlees, P. T.*; Auranen, K.*; Badran, H.*; Block, M.*; Briselet, R.*; Cox, D. M.*; Dasgupta, M.*; et al.
Physics Letters B, 764, p.265 - 270, 2017/01
被引用回数:21 パーセンタイル:81.65(Astronomy & Astrophysics)The new neutron-deficient nuclei Es and
Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from
Es produced in the fusion-evaporation reaction
Bi(
S,3n)
Es. Half-lives of 6(2)s and 22
s were obtained for
Es and
Bk, respectively. Two groups of
particles with energies
=8.19(3) MeV and 8.09(3) MeV were unambiguously assigned to
Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for
Es and
Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.
Sahin, E.*; Doncel, M.*; Sieja, K.*; De Angelis, G.*; Gadea, A.*; Quintana, B.*; Grgen, A.*; Modamio, V.*; Mengoni, D.*; Valiente-Dob
n, J. J.*; et al.
Physical Review C, 91(3), p.034302_1 - 034302_9, 2015/03
被引用回数:27 パーセンタイル:82.31(Physics, Nuclear)The level structure of the neutron-rich Cu,
Cu, and
Cu isotopes was investigated using multinucleon transfer reactions at Laboratori Nazionali di Legnaro using the AGATA Demonstrator array coupled to the PRISMA magnetic spectrometer. Lifetimes of excited states in Cu nuclei were measured with the recoil-distance Doppler-shift method. The resulting electromagnetic matrix elements for transitions from excited states in
Cu nuclei was used to assess the collective or single-particle character of these states. The results are compared with predictions of large-scale shell-model calculations, showing how the proton pf shell evolve as neutrons fill the 1g
orbital.
Rubert, J.*; Dorvaux, O.*; Gall, B. J. P.*; Greenlees, P. T.*; Asfari, Z.*; Piot, J.*; Andersson, L. L.*; 浅井 雅人; Cox, D. M.*; Dechery, F.*; et al.
Journal of Physics; Conference Series, 420, p.012010_1 - 012010_10, 2013/03
被引用回数:0 パーセンタイル:0.00(Physics, Nuclear)初めての超重元素即発インビーム線分光実験を
Rfを対象に行った。MIVOC法を用いた大強度
Tiビームの開発を行い、実験を成功させた。
Rfの回転励起状態をスピン20
まで観測し、その慣性能率を導出した。これらのデータから、陽子数104には大きな変形閉殻が存在しないことが明らかとなった。
Greenlees, P. T.*; Rubert, J.*; Piot, J.*; Gall, B. J. P.*; Andersson, L. L.*; 浅井 雅人; Asfari, Z.*; Cox, D. M.*; Dechery, F.*; Dorvaux, O.*; et al.
Physical Review Letters, 109(1), p.012501_1 - 012501_5, 2012/07
被引用回数:62 パーセンタイル:88.45(Physics, Multidisciplinary)104番元素Rfの回転励起構造をインビーム
線核分光の手法により初めて観測することに成功した。
Rfは回転励起構造が観測された最も重い原子核であり、今回の結果は重い極限に位置する原子核の一粒子軌道殻構造と対相関に関する貴重な情報を与える。今回の実験で得られた
Rfの回転状態の慣性能率の値は、陽子数104における変形閉殻の存在を明確に否定し、近年の数多くの自己無撞着平均場モデルの予測と異なる結果を示した。