Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Bronis, A.*; Heberger, F. P.*; Antalic, S.*; Andel, B.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; et al.
Physical Review C, 106(1), p.014602_1 - 014602_12, 2022/07
被引用回数:2 パーセンタイル:47.44(Physics, Nuclear)The decay of excited states in No was investigated by applying the evaporation-residue-conversion-electron correlation technique. Two new isomeric states were observed in No together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in No is proposed, and their Nilsson configurations are discussed. The energy decrease of the 11/2[725] Nilsson level for heavy =153 isotones as a function of increasing proton number is confirmed.
Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; Barton, C. J.*; Antalic, S.*; Auranen, K.*; Badran, H.*; Cox, D.*; Cubiss, J. G.*; O'Donnell, D.*; et al.
Physical Review C, 99(6), p.064310_1 - 064310_6, 2019/06
被引用回数:3 パーセンタイル:31.66(Physics, Nuclear)An experiment has been performed to study excited states in the neutron-deficient nucleus Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyvskyl. By using isomer tagging, an isomeric state with a half-life of 6.58(15) s has been observed in Ir for the first time. It has been established that the isomer decays via a 45.2 () - 26.1 () keV cascade to new states below the previously reported ground state in Ir with . We now reassign this state to the isomeric state discovered in this study.
Mller-Gatermann, C.*; Dewald, A.*; Fransen, C.*; Auranen, K.*; Badran, H.*; Beckers, M.*; Blazhev, A.*; Braunroth, T.*; Cullen, D. M.*; Fruet, G.*; et al.
Physical Review C, 99(5), p.054325_1 - 054325_7, 2019/05
被引用回数:8 パーセンタイル:62.89(Physics, Nuclear)陽子過剰核Hgにおける変形共存を調べることを目的として、ユヴァスキュラ大学の加速器においてRh(Kr, )反応によってHgを生成し、その原子核の励起状態からの脱励起の寿命を測定した。実験データを理論計算と比較した結果、HgではHgに比べ、プロレート変形した状態がより高い励起状態へとシフトするとともに、変形度が増大することがわかった。
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:18 パーセンタイル:80.37(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 22s 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.
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:0.04(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。
Lane, J. F. W.*; Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Gerl, J.*; Heberger, F. P.*; Hofmann, S.*; Huyse, M.*; Kettunen, H.*; Kleinbhl, A.*; et al.
Physical Review C, 87(1), p.014318_1 - 014318_7, 2013/01
被引用回数:15 パーセンタイル:68.00(Physics, Nuclear)By using the technique of correlating implanted evaporation residues and their subsequent fission decay, -delayed fission (DF) of Bi has been identified for the first time and DF of Bi has been unambiguously confirmed. The experiments were performed at the velocity filter SHIP (GSI, Darmstadt). The DF probabilities for both nuclides were qualitatively estimated, and, in particular indications for a large value in the case of Bi are regarded.
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:58 パーセンタイル:88.57(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。
Hofmann, S.*; Heinz, S.*; Mann, R.*; Maurer, J.*; Khuyagbaatar, J.*; Ackermann, D.*; Antalic, S.*; Barth, B.*; Block, M.*; Burkhard, H. G.*; et al.
European Physical Journal A, 48(5), p.62_1 - 62_23, 2012/05
被引用回数:167 パーセンタイル:98.85(Physics, Nuclear)The synthesis of element 116 in the reactions of Ca+Cm was studied at the GSI-SHIP. Four decay chains from the isotope 116 and one decay 116 were detected at the reaction leading to the excitation energy of 40.9 MeV. The cross sections were 3.4 and 0.9 pb, respectively. The decay character reproduced the reported data at FLNR, Russia. In the decay chain, we observed the higher -particle energy in the decay of 114, which suggested the population and the decay of a quasiparitcle state.
Heberger, F. P.*; Antalic, S.*; Ackermann, D.*; Kalaninov, Z.*; Heinz, S.*; Hofmann, S.*; Streicher, B.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.
European Physical Journal A, 48(5), p.75_1 - 75_9, 2012/05
被引用回数:26 パーセンタイル:78.07(Physics, Nuclear)Nuclear structure and decay of the isotope No and its decay products Fm and Md were investigated by means of - spectroscopy. Besides the established strong transitions from the 9/2[734] Nilsson level in Fm, populated predominantly by the decay of No, into the ground-state(gs) rotational band, a couple of weaker lines were observed and placed into the Fm level scheme. The transition from the 7/2 level in Es, populated by the decay of Md, into the 9/2 member of the gs rotational band, so far established for other odd-mass Es isotopes, was observed clearly. The GEANT4 simulations were performed to investigate the influence of energy summing between particles and conversion electrons (CE) on the shape of the spectra at different implantation energies, leading to evidence for a weak decay branch of No into the gs of Fm or the ground-state rotational band, respectively.
Antalic, S.*; Heberger, F. P.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Kalaninov, Z.*; Kindler, B.*; Khuyagbaatar, J.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.
European Physical Journal A, 47(5), p.62_1 - 62_12, 2011/05
被引用回数:29 パーセンタイル:82.87(Physics, Nuclear)Nuclear structure and decay of isomer in No were investigated. The isotope was produced by the reaction Ca+Pb. The excitation energy of the known single-particle isomeric state (5/2[622]) was measured by delayed coincidence between -rays and implanted evaporation residues and was placed into the level scheme. In addition, decay of a high-lying multi-quasiparticle isomer in No was studied using e- coincidence measurements. A rotational band populated by its de-excitation was identified in No. A new isomeric state in Fm was observed and a partial-level scheme for this isotope is suggested. In addition transitions from excited levels are reproduced for Md.
Heberger, F. P.*; Antalic, S.*; Sulignano, B.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Kindler, B.*; Khuyagbaatar, J.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.
European Physical Journal A, 43(1), p.55 - 66, 2010/01
被引用回数:71 パーセンタイル:95.18(Physics, Nuclear)-rays decay study of two K isomers in No was performed. Two new transitions of 778 and 856 keV could be attributed to the decay pattern of No (T=275 ms). The population of an excited band built up on this isomer (=8) by the decay of No (198 s) could be proven. A spontaneous fission branch of 2.010 was measured for No, and upper limit of 1.210 was estimated for No. These values demonstrate the high stability of multi-quasiparticle configuration against spontaneous fission.
Antalic, S.*; Heberger, F. P.*; Hofmann, S.*; Ackermann, D.*; Heinz, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; et al.
European Physical Journal A, 38(2), p.219 - 226, 2008/11
被引用回数:34 パーセンタイル:84.77(Physics, Nuclear)The radioactive decay of the isotopes Lr and their daughter products was investigated by means of , prompt and delayed conversion electron coincidence spectroscopy. The experiment was carried out at GSI by using the velocity filter SHIP to separate evaporation residues, produced in the reaction Ca+Bi, from the primary beams. In Lr, a second short-lived isomer with a half-life of 1.91 ms was found. For Lr, new data for transitions of levels in Md populated by decay were observed. The constructed level schemes are useful for the nuclear structure theory.
Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Comas, V. F.*; Dressler, R.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Heberger, F. P.*; et al.
European Physical Journal A, 32(3), p.251 - 260, 2007/06
被引用回数:262 パーセンタイル:99.70(Physics, Nuclear)The fusion reaction of Ca projectiles withU target nuclei was studied at the velocity filter SHIP of GSI. Two decay chains were measured, which fully confirm data that were previously assigned to the isotope 112 in experiments at the Flerov Laboratory in Dubna. Two other events are consistent with a 50% spontaneous fission (SF) branch of this isotope. The mean value obtained for the half-life of 112 is (6.9) s, the energy is (9.5200.015) MeV, and the total kinetic energy (TKE) of SF is (23814) MeV. The half-life of the decay daughter nucleus Ds is (0.18) s, and the TKE of SF is (210) MeV. The cross-section deduced from all four events is (0.72) pb, measured at an excitation energy of 34.6 MeV of the compound nucleus 112.
Heberger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; et al.
European Physical Journal A, 30(3), p.561 - 569, 2006/12
被引用回数:52 パーセンタイル:91.57(Physics, Nuclear)Rf, No及びFmについて、線と線の検出による崩壊核分光実験を行った。実験は、ドイツ重イオン研究所の線形加速器施設UNILACにおける反跳生成核分離装置SHIPを用いて行った。SHIPで分離された蒸発残留核を焦点に設置したシリコン検出器に打ち込んだ。この検出器で崩壊を検出し、また近くに設けたGe検出器で線を検出した。これら同位体は、Pb(Ti,2n)Rf及びこのRfの崩壊核種として生成し、さらにPb(Ca,3n)No反応及びこのNoの崩壊核種として生成した。解析から次のことがわかった。(1)Noには半減期1.0秒のアイソマがあることがわかっていたが、このエネルギー準位が106keVであることがわかった。(2)また、Noには2sの半減期を持つ第2のアイソマがあり、Pb(Ca,3n)No反応で直接生成されることがわかった。このアイソマは、2本の線とコインシデンスし、解析から励起エネルギーが1700keV以上の準位にあることが示唆された。この2本の線は、Rfの崩壊につづく遷移と一致した。
Heberger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; et al.
European Physical Journal A, 29(2), p.165 - 173, 2006/08
被引用回数:41 パーセンタイル:88.32(Physics, Nuclear)The decay of No was investigated by means of - spectroscopy. The experiment was carried out by using the velocity filter SHIP at GSI. The isotope was produced in the reactions Pb(Ca,n)No, Bi(Ca,2n)Lr (EC)- No, and U(Ne,5n)No. Decay data for - coincidence measurements were obtained, and the level structures of the daughter nucleus Fm were obtained, including the tentative assignment of (1) 9/2 for ground state and (2) 5/2 for the 200 keV isomeric state with =21 s.