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Kaya, L.*; Vogt, A.*; Reiter, P.*; Siciliano, M.*; 清水 則孝*; 宇都野 穣; Wang, H.-K.*; Gargano, A.*; Coraggio, L.*; Itaco, N.*; et al.
Physical Review C, 100(2), p.024323_1 - 024323_18, 2019/08
被引用回数:12 パーセンタイル:76.6(Physics, Nuclear)Baの高スピン状態をおよび反応によって生成し、そこからの脱励起ガンマ線を観測した。Baの1942keVのアイソマーの寿命を66.6(20)nsと決定し、Baのよりの高スピン状態を見つけた。この結果を殻模型計算と比較し、Baのとの間隔やとの間隔が広がるなどの特徴が計算によってよく再現できることがわかった。
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:41.04(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。
Diriken, J.*; Patronis, N.*; Andreyev, A. N.; Antalic, S.*; Bildstein, V.*; Blazhev, A.*; Darby, I. G.*; De Witte, H.*; Eberth, J.*; Elseviers, J.*; et al.
Physical Review C, 91(5), p.054321_1 - 054321_15, 2015/05
被引用回数:9 パーセンタイル:54.64(Physics, Nuclear)Excited states up to an excitation energy of 5.8 MeV were populated in the neutron-rich isotope Ni via the Ni(d,p) transfer reaction at REX-Isolde, CERN. In particular, single-neutron states above the N=40 sub-shell gap were populated, and the relative spectroscopic factors were extracted using distorted-wave Born approximation analysis. The positive parity g, d and s neutron orbits above the shell closure are assumed to induce strong quadrupole collectivity in neutron-rich Fe and Cr isotopes. The extracted relative spectroscopic factors show that the strength of the d orbit is mostly split over two states, hinting to substantial mixing of the neutron d configuration with collective modes of the core. The size of the N=50 shell gap was also estimated, and found to be 2.6 MeV near Ni, as also determined in lighter Ni isotopes.
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:26 パーセンタイル:84.22(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.
Diriken, J.*; Patronis, N.*; Andreyev, A. N.*; Antalic, S.*; Bildstein, V.*; Blazhev, A.*; Darby, I. G.*; De Witte, H.*; Eberth, J.*; Elseviers, J.*; et al.
Physics Letters B, 736, p.533 - 538, 2014/09
被引用回数:18 パーセンタイル:74.49(Astronomy & Astrophysics)The neutron orbits , d and s are assumed to be responsible for the swift onset of collectivity observed in the region below Ni. In order to gather information on the single-particle energies and spectroscopic factors of these orbitals, single-particle states in the nucleus Ni were populated using the reaction Ni(d,p), in inverse kinematics, at REX-ISOLDE, CERN. The new isotope was studied using combined particle- spectroscopy. Comparison with DWBA calculations, permitted the identification of positive parity states with a substantial amount of d (1007 keV) and d (2207 and 3277 keV) single-particle strength. Comparisons with extended Shell-Model calculations was also performed to confirm the single-particle nature of these states, and to deduce general properties around Ni.