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論文

EXILL; A High-efficiency, high-resolution setup for $$gamma$$-spectroscopy at an intense cold neutron beam facility

Jentschel, M.*; Blanc, A.*; de France, G.*; K$"o$ster, U.*; Leoni, S.*; Mutti, P.*; Simpson, G.*; Soldner, T.*; Ur, C.*; Urban, W.*; et al.

Journal of Instrumentation (Internet), 12(11), p.P11003_1 - P11003_33, 2017/11

 被引用回数:27 パーセンタイル:86.8(Instruments & Instrumentation)

A highly efficient array of high-purity germanium (HPGe) detectors was developed and operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of $$gamma$$-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10$$^8$$ns$$^{-1}$$cm$$^{-2}$$ at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr$$_{3}$$:(Ce) detectors from the FATIMA collaboration.

論文

Shell evolution beyond $$N$$=40; $$^{69,71,73}$$Cu

Sahin, E.*; Doncel, M.*; Sieja, K.*; De Angelis, G.*; Gadea, A.*; Quintana, B.*; G$"o$rgen, A.*; Modamio, V.*; Mengoni, D.*; Valiente-Dob$'o$n, J. J.*; et al.

Physical Review C, 91(3), p.034302_1 - 034302_9, 2015/03

 被引用回数:20 パーセンタイル:82.78(Physics, Nuclear)

The level structure of the neutron-rich $$^{69}$$Cu, $$^{71}$$Cu, and $$^{73}$$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 $$^{69,71,73}$$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$$_{9/2}$$ orbital.

口頭

$$^{16}$$O+$$^{24}$$Mg反応による質量数30領域の高スピン状態の研究

井手口 栄治*; Liu, M.*; 森川 恒安*; 藤 暢輔; 小泉 光生; 大島 真澄; 木村 敦; 古高 和禎; 初川 雄一; Cederwall, B.*; et al.

no journal, , 

質量数30領域の原子核の高スピン状態を調べ、変形状態を探索するために、タンデム加速器施設において、$$^{16}$$O+$$^{24}$$Mg反応によるインビーム$$gamma$$線核分光実験を行った。エネルギー70MeVの$$^{16}$$Oビームを$$^{24}$$Mgターゲットに照射し、A$$sim$$30領域核の高スピン状態を生成した。$$gamma$$線検出器アレイGEMINI-IIと荷電粒子フィルターSiBallを組合せた測定により、蒸発チャンネルを選別して生成原子核の高スピン状態準位構造を調べた。

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