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Kleis, H.*; Seidlitz, M.*; Blazhev, A.*; Kaya, L.*; Reiter, P.*; Arnswald, K.*; Dewald, A.*; Droste, M.*; Fransen, C.*; Mller, O.*; et al.
Physical Review C, 104(3), p.034310_1 - 034310_9, 2021/09
被引用回数:1 パーセンタイル:19.67(Physics, Nuclear)ケルン大学のタンデム加速器にて、Ca(B, )Cr反応によってCrの励起状態を生成し、そこから脱励起する励起状態の寿命をドップラーシフト反跳距離法を用いて測定した。状態から状態へ脱励起する遷移の寿命が6.33(46)ps, 状態から状態へ脱励起する励起の寿命が5.61(28)psであることが決定された。その値から, 値を引き出し、これらが殻模型計算の値とよく一致することがわかった。小さな値は、状態と状態が異なる回転バンドに属しているためであると解釈された。
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:6 パーセンタイル:64.83(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。
Queiser, M.*; Vogt, A.*; Seidlitz, M.*; Reiter, P.*; 富樫 智章*; 清水 則孝*; 宇都野 穣; 大塚 孝治*; 本間 道雄*; Petkov, P.*; et al.
Physical Review C, 96(4), p.044313_1 - 044313_13, 2017/10
被引用回数:5 パーセンタイル:41.77(Physics, Nuclear)ケルン大学のタンデム加速器にてZnの励起状態を核融合反応および核子移行反応によって生成し、そのいくつかの脱励起線を放出する寿命を測定した。そこから電磁遷移強度を得た。殻内の配位が主である負パリティ状態間の遷移に加え、殻から殻へ中性子が励起した配位をもつ正パリティ間の遷移強度を得ることにも成功した。これらの正パリティ状態は、以前はオブレート変形しているとも考えられていたが、実験で得られた遷移強度を大規模殻模型計算の結果と比較することによって、プロレート変形を持つことが明らかとなった。
Shand, C. M.*; Podolyk, Zs.*; Grska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; et al.
Physics Letters B, 773, p.492 - 497, 2017/10
被引用回数:23 パーセンタイル:87.56(Astronomy & Astrophysics)Low-lying states in neutron-rich Zn nuclei were measured for the first time via in-beam -ray spectroscopy at RIKEN. These include the 4 to 2 in Zn and the 2 to 0 and 4 to 2 in Zn. The reduced E() energies and increased E(4)/E(2) ratios at =52,54 compared to Zn attest that the magicity is confined just on the neutron number =50 only. The levels observed in Zn suggest the onset of deformation towards heavier Zn isotopes. The data were compared to state-of-the-art shell model calculations.
Flavigny, F.*; Doornenbal, P.*; Obertelli, A.*; Delaroche, J.-P.*; Girod, M.*; Libert, J.*; Rodriguez, T. R.*; Authelet, G.*; 馬場 秀忠*; Calvet, D.*; et al.
Physical Review Letters, 118(24), p.242501_1 - 242501_6, 2017/06
被引用回数:34 パーセンタイル:86.96(Physics, Multidisciplinary)The first -ray spectroscopy of very neutron rich Kr isotopes was carried out at the RIBF at RIKEN Nishina center. Excited states in these isotopes were populated via (p,2p) reactions using radioactive Rb beams accelerated to 220 MeV/nucleon. The new data show a significant increase in deformation beyond N=60, as well as competing configurations (shape-coexistence) at low energy. The data were compared with beyond-mean-field calculations which predict level energies in good agreement with observation, and suggest oblate-prolate shape coexistence.
Chen, S.*; Doornenbal, P.*; Obertelli, A.*; Rodriguez, T. R.*; Authelet, G.*; 馬場 秀忠*; Calvet, D.*; Chteau, F.*; Corsi, A.*; Delbart, A.*; et al.
Physical Review C, 95(4), p.041302_1 - 041302_6, 2017/04
被引用回数:23 パーセンタイル:87.56(Physics, Nuclear)Neutron-rich isotopes of selenium, Se, where studied via in beam -ray spectroscopy after nucleon removal reactions at RIBF in RIKEN. The low-energy excitations of these nuclei were investigated using - coincidences, and the first and second excited 2 states were found at remarkably low energies. The analysis and comparison with self-consistent beyond-mean field calculations suggest that both shape coexistence and triaxiality are needed to describe these isotopes.
Paul, N.*; Corsi, A.*; Obertelli, A.*; Doornenbal, P.*; Authelet, G.*; 馬場 秀忠*; Bally, B.*; Bender, M.*; Calvet, D.*; Chteau, F.*; et al.
Physical Review Letters, 118(3), p.032501_1 - 032501_7, 2017/01
被引用回数:36 パーセンタイル:88.46(Physics, Multidisciplinary)The first measurement of rays emitted by the very neutron rich nuclei Mo (Z=42) and Zr (Z=40) was carried out at the RIBF facility at RIKEN. These data shine light on the postulated N=70 harmonic oscillator shell. If the spin-orbit splitting which gives rise to the N=82 shell gap is reduced in very neutron-rich nuclei, the harmonic oscillator gap at N=70 should open instead. However, both the measured energy of the first excited state Mo and Zr, respectively 235(7) keV and 185(11) keV, and their E(4)/E(2) ratio, indicate that these nuclei are good rotors, and exclude the shell stabilization scenario at Z=40 and N=70. These results were compared to state-of-the-art density functional theoretical calculations using Gogny and Skyrme effective interactions.
Sahin, E.*; Doncel, M.*; Sieja, K.*; De Angelis, G.*; Gadea, A.*; Quintana, B.*; Grgen, A.*; Modamio, V.*; Mengoni, D.*; Valiente-Dobn, J. J.*; et al.
Physical Review C, 91(3), p.034302_1 - 034302_9, 2015/03
被引用回数:25 パーセンタイル:84.57(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.