Study of Giant Monopole Resonance in Unstable Nuclei via Proton Inelastic Scattering at Zero Degrees

通过零度质子非弹性散射研究不稳定原子核中的巨单极子共振

• 批准号: 13440064
• 负责人: KOBAYASHI Toshio
• 金额: $ 8.19万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440064/
• 关键词: Exotic Nuclei; Giant Monopole Resonance; Nuclear compressibility; Proton Inelastic Scattering; Neutron-Rich Nuclei; 超前方非弾性散; 超前方非弾性散乱; RIビーム; 核物質; 圧縮率

We have developed new experimental technique to study Giant Monopole Resonances in exotic nuclei via proton inelastic scattering at zero degrees utilizing inverse kinematics. In this method, low-energy protons emitted at zero degrees are detected by the Si strip focal plane detectors in the 180-degree-bend-type magnetic spectrometer. Total kinetic energy and the time of flight of protons are measured to get the the excitation energy of the nucleus and the scattering angle of protons. After constructing window-frame-type magnetic dipole magnet, development and construction of the Si-strip focal plane detectors, development of high-resolution TOF measurements, energy resolution of less than 10keV (rms) and TOF resolution of less than 1 nsec (rms) were obtained for 0-4 MeV protons. Test experiments were performed at RIKEN accelerator facility. using primary heavy ion beams (^<12>C and^<40>Ar) and neutron-rich secondary beams (^<38>S) at around 60 MeV/A. Through these tests, we have succeeded to reduce physical backgrounds down to negligible level under the actual experimental conditions. Finally we have performed zero-degree proton inelastic scattering measurements from p(^<38>S,p') reaction, and succeeded to observe L=0 and L=1 type excitations. Although backgrounds from C component in CH2 target need to be reduced, we have succeeded to establish proposed new, experimental technique.

我们开发了一种新的实验技术，利用逆运动学方法，通过质子零度非弹性散射来研究奇异核中的巨单极子共振。该方法利用180度弯曲型磁谱仪中的硅条焦平面探测器探测零度发射的低能质子。通过测量质子的总动能和飞行时间，得到原子核的激发能和质子的散射角。通过构建窗框式磁偶极子磁体、开发和构建硅带焦平面探测器、开发高分辨率TOF测量，实现了0-4 MeV质子的能量分辨率小于10keV （rms）和TOF分辨率小于1 nsec （rms）。测试实验在RIKEN的加速器设备上进行。使用初级重离子束（^<12>C和^<40>Ar）和富含中子的次级束（^<38>S），功率约为60 MeV/A。通过这些测试，我们成功地将实际实验条件下的物理背景降低到可以忽略不计的水平。最后，我们对p（^<38>S,p'）反应进行了零度质子非弹性散射测量，成功地观察到L=0和L=1型激发。虽然需要减少CH2靶中C组分的背景，但我们已经成功地建立了新的实验技术。

项目成果

Pre-emmision of correlated neutrons in the fusion of ^<11>Li halo nuclei with Si target

^<11>Li晕核与Si靶聚变中相关中子的预发射

• 发表时间: 2004
• 期刊: Physical Review C69
• 作者: M.Petrascu et al.

R.Kanungo, N.Iwasa et al.: "Possibility of two-proton halo in ^<17>Ne"Physics Letters. B571. 21-28 (2003)

R.Kanungo、N.Iwasa 等人：“^<17>Ne 中双质子晕的可能性”《物理快报》。

Possibility of a two-proton halo in 17Ne

• DOI: 10.1016/j.physletb.2003.07.050
• 发表时间: 2003-10
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: R. Kanungo;M. Chiba;S. Adhikari;D. Fang;N. Iwasa;K. Kimura;K. Maeda;S. Nishimura;Y. Ogawa;T. Ohnishi;A. Ozawa;C. Samanta;T. Suda;T. Suzuki;Q. Wang;C. Wu;Y. Yamaguchi;K. Yamada;A. Yoshida;T. Zheng;I. Tanihata

Coulomb and nuclear breakup of a halo nucleus 11Be

• DOI: 10.1103/physrevc.70.054606
• 发表时间: 2004-09
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: N. Fukuda;T. Nakamura;N. Aoi;N. Imai;M. Ishihara;T. Kobayashi;H. Iwasaki;T. Kubo;A. Mengoni;M. Notani;H. Otsu;H. Sakurai;S. Shimoura;T. Teranishi;Y. Watanabe;K. Yoneda

Possibility of a two-proton hale in ^<17>Ne

^<17>Ne 中存在二质子霍尔的可能性

• 发表时间: 2003
• 期刊: Physics Letters B571
• 作者: R.Kanungo et al.