Current progress of nuclear astrophysics study and BRNBF at CIAE

Liu, Weiping; Li, Zhihong; Xi-Xiang, Bai; Wang, Youbao; Liu, Gang; Zeng, Sheng; Yan, S. Q.; Wang, Baoxiang; Zhao, Zhanzheng; Zhang, Tianjue; Tang, Hongqing; Bingfan, Yang; Guan, Xiaotong; Cui, Baoqun

doi:10.1016/s0168-583x(02)01892-x

Cited by 20 publications

(2 citation statements)

References 4 publications

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“…In the experiment, the host foils were made of nat-ural Pt and Al to thicknesses of 50 µm and 2 mm, respectively. The 7 Be sources were prepared by irradiating the Pt and Al foils with 28 MeV 7 Be ions from the radioactive secondary beam line [18] of the HI-13 Tandem Accelerator at China Institute of Atomic Energy. The irradiation lasted for about 35 h for each foil.…”

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confidence: 99%

Search for Decay Rate Variation of ⁷ Be in Pt and A1

Li¹,

Shu-Hua²,

Liu³

et al. 2010

Chinese Phys. Lett.

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The decay rate variation of 7 Be implanted into platinum and aluminum host materials has been measured via detecting the 478 keV 𝛾-rays from the first excited state of 7 Li populated in the electron capture decay of 7 Be. The result (𝜆Pt − 𝜆 Al )/𝜆0 = (−0.17 ± 0.13)% is obtained. It is smaller than the theoretical estimate from the TB-LMTO calculation (0.38%). This is quite different from our previous study which showed a larger decay rate variation ((0.8 ± 0.2)%) than the TB-LMTO calculation (0.30%) of 7 Be in palladium and gold. It is suggested that the effective quasi-free electron density near the implanted ions in different metal host materials may play an important role in 7 Be EC decay rate variation in addition to the electronic affinity and crystal structure of different host materials.

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mentioning

confidence: 99%

Search for Decay Rate Variation of ⁷ Be in Pt and A1

Li¹,

Shu-Hua²,

Liu³

et al. 2010

Chinese Phys. Lett.

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“…(Q = 1.839 MeV) reaction at E c.m. = 7.8 MeV in inverse kinematics and derived the 8 Li(n, γ) 9 Li g.s.direct capture cross sections at energies of astrophysical interest.The experiment was carried out using the secondary beam facility GIRAFFE[18] of the HI-13 tandem accelerator, Beijing. A 44 MeV 7 Li primary beam from the tandem impinged on a 4.8 cm long deuterium gas cell at a pressure of 1.6 atm.…”

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The 8Li(d,p)9Li Reaction and the Astrophysical 8Li(n,g)9Li Reaction Rate

2009

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The 8 Li(n, γ) 9 Li reaction plays an important role in both the r-process nucleosynthesis and the inhomogeneous big bang models, its direct capture rates can be extracted from the 8 Li(d, p) 9 Li reaction, indirectly. We have measured the angular distribution of the 8 Li(d, p) 9 Li g.s. reaction at E c.m. = 7.8 MeV in inverse kinematics using coincidence detection of 9 Li and recoil proton, for the first time. Based on Distorted Wave Born Approximation (DWBA) analysis, the 8 Li(d, p) 9 Li g.s.cross section was determined to be 7.9 ± 2.0 mb. The single particle spectroscopic factor, S 1,3/2 , for the ground state of 9 Li = 8 Li ⊗ n was derived to be 0.68 ± 0.14, and then used to calculate the direct capture cross sections for the 8 Li(n, γ) 9 Li g.s. reaction at energies of astrophysical interest.The astrophysical 8 Li(n, γ) 9 Li g.s. reaction rate for the direct capture was found to be 3970 ± 950 cm 3 mole −1 s −1 at T 9 = 1. This presents the first experimental constraint for the 8 Li(n, γ) 9 Li reaction rates of astrophysical relevance.

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