A PROBABLE NEW TYPE OF REACTION MECHANISM —DOUBLE α DIRECT TRANSFER PROCESS

XU Shu-Wei; WU Guo-Hua; MIAO Rong-Zhi; HAN Fei

Chinese Physics C> 1983, Vol. 7> Issue(2) : 217-222

A PROBABLE NEW TYPE OF REACTION MECHANISM —DOUBLE α DIRECT TRANSFER PROCESS

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Abstract：
It is assumed that ⁸Be consists of two α-particles which are close to each other in configration space. A spectroscopic density of ⁸Be-cluster in the residue nuclei is them obtained which is proportional to the square of the preformation probability of α-particle at nuclear surface. Using the improved method of parametrization of EFRDWBA overlap integral^[1], We calculate the double diffirential energy spectra and angular distributions of α-particles for the reactions ²⁰⁹Bi(¹²C, α) ²¹⁷Fr and extracte the preformation probability of α-particle at the surface of ²¹⁷Fr nuclei from fitting the experimental data. The agreement within the range of calculation error between the preformation probabilities extracted from transfer reactions and α-decay suggests that the reaction ²⁰⁹Bi(¹²C, α) ²¹⁷Fr may be explained as a diuble α direct transfer process.

References

[1]

T. Udagawa, T. Tamura and D. Price, Phys. Rev., C21 (1980), 1891,[2] 徐树威、吴国华、缪容之、韩飞,(待发表).[3] R. Bimbot, D. Gardes, M. F. Rivet, Nucl. Phys.; A189 (1972), 193,[4] 沈文庄、徐树威、王大延、谢元祥、郭忠言、李祖玉, 高能物理与核物理, 1(1977), 71,[5] 郭俊盛、孙锡军、徐晓冀、王傅、刘洪业, 高能物理与核物理, 2 (1978), 143,[6] 徐树威, 冉启慧、马洪范, 2 (1978), 534,[7] 中国科学院近代物理研究所内部资料, 徐树威、吴国华.[8] 谢元祥、范国英等, 中国科学院近代物理研究所科技情报资料汇编, 3 (1979),[9] A. R. Barnet and J. S. Lilley, Phys. Rev., C9 (1974), 2010,[10] 详细情况请参阅文献[2].[11] 中国科学院近代物理研究所内部资料, 缪容之、徐树威.[12] L. Milazzo-colli, G. M. Brage-marcazzan and M. Milazzo, Nuovo Cimcnto, 30A (1975), 632.[13] 中国科学院近代物理研究所内部资料, 韩飞、徐树威.[14] D. Kurath, Phys. Rev., C7 (1973), 1390,[15] U. Facchini and E. Saetta-Menichlla, Encrgia Nucleate, 15 (1968), 54.[16] R. Bonetti and L. Milazzo-colli, Phys. Lett., 49B (1974), 17.

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XU Shu-Wei, WU Guo-Hua, MIAO Rong-Zhi and HAN Fei. A PROBABLE NEW TYPE OF REACTION MECHANISM —DOUBLE α DIRECT TRANSFER PROCESS[J]. Chinese Physics C, 1983, 7(2): 217-222.

XU Shu-Wei, WU Guo-Hua, MIAO Rong-Zhi and HAN Fei. A PROBABLE NEW TYPE OF REACTION MECHANISM —DOUBLE α DIRECT TRANSFER PROCESS[J]. Chinese Physics C, 1983, 7(2): 217-222. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

A PROBABLE NEW TYPE OF REACTION MECHANISM —DOUBLE α DIRECT TRANSFER PROCESS

Corresponding author: XU Shu-Wei,

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1983-04-05

Abstract:

It is assumed that ⁸Be consists of two α-particles which are close to each other in configration space. A spectroscopic density of ⁸Be-cluster in the residue nuclei is them obtained which is proportional to the square of the preformation probability of α-particle at nuclear surface. Using the improved method of parametrization of EFRDWBA overlap integral^[1], We calculate the double diffirential energy spectra and angular distributions of α-particles for the reactions ²⁰⁹Bi(¹²C, α) ²¹⁷Fr and extracte the preformation probability of α-particle at the surface of ²¹⁷Fr nuclei from fitting the experimental data. The agreement within the range of calculation error between the preformation probabilities extracted from transfer reactions and α-decay suggests that the reaction ²⁰⁹Bi(¹²C, α) ²¹⁷Fr may be explained as a diuble α direct transfer process.