Measurement of 12C+13C Fusion Cross Sections Below Coulomb Barrier Energies
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摘要: 深垒下能区的12C+13C熔合截面测量对检验天体中熔合反应外推模型具有很重要的意义。目前在库仑位垒以下能区存在的各种测量结果,都利用了统计模型来修正得到熔合截面,但对于这些方法间的系统误差仍没有很好地研究。实验采用离线活度测量的方法,在Ec.m.=4.4~5.8 MeV能区内对12C+13C熔合截面进行测量。经Hauser-Feshbach统计模型对分支比的修正后,熔合总截面由24Na活度推导出。通过本实验数据与其它实验方法获得的数据进行比较,确定了统计模型的系统误差为14%。
The study of fusion reactions of 12C+13C at the deep sub-barrier energies is very important for the test of predictive power of the extrapolation models for nuclear reactions for astrophysics. Until now, all the measurements below Coulomb barrier energies have to use the statistical model calculations to estimate the branching ratios to deduce the total fusion cross sections. However, the systematic uncertainty induced by the calculated corrections has not been studied well. In this experiment, the fusion cross sections of 12C+13C have been measured using an offline activity measurement in the range of Ec.m.=4.4 to 5.8 MeV. The total fusion cross sections have been deduced from the 24Na activities after correcting the branching ratios estimated with the Hauser-Feshbach statistical model. Through the comparison between our result and other data obtained with other methods, the systematic uncertainty of statistical model has been determined to be 14%.-
关键词:
- 12C+13C垒下熔合 /
- 统计模型 /
- 系统误差
Abstract: The study of fusion reactions of 12C+13C at the deep sub-barrier energies is very important for the test of predictive power of the extrapolation models for nuclear reactions for astrophysics. Until now, all the measurements below Coulomb barrier energies have to use the statistical model calculations to estimate the branching ratios to deduce the total fusion cross sections. However, the systematic uncertainty induced by the calculated corrections has not been studied well. In this experiment, the fusion cross sections of 12C+13C have been measured using an offline activity measurement in the range of Ec.m.=4.4 to 5.8 MeV. The total fusion cross sections have been deduced from the 24Na activities after correcting the branching ratios estimated with the Hauser-Feshbach statistical model. Through the comparison between our result and other data obtained with other methods, the systematic uncertainty of statistical model has been determined to be 14%. -
[1] ROLFS C, RODNEY W S. Cauldrons in the Cosmos[M]. Chicago:University of Chicago Press, 1988. [2] HILLEBRANDT W, NIEMEYER J. Annu Rev Astron Astrophys, 2000, 38:191. [3] SPILLANE T, RAIOLA F, ROLFS C, et al. Phys Rev Lett, 2007, 98:122501. [4] GASQUES L R, BROWN E F, CHIEFFI A, et al. Phys Rev C, 2007, 76:035802. [5] NOTANI M, ESBENSEN H, FANG X, et al. Phys Rev C, 2012, 85:014607. [6] PATTERSON J R, WINKLER H, ZAIDINS C S. Astrophys J, 1969, 157:367. [7] BARNES C A, TRENTALANGE S, WU S C Treatise on Heavy-ion Science[M]. New York:Plenum Press, 1985:3. [8] JIANG C L, BACK B B, ESBENSEN H, et al. Phys Rev Lett, 2013, 110:072701. [9] ESBENSEN H, TANG X, JIANG C L. Phys Rev C, 2011, 84:064613. [10] DAYRAS R A, STOKSTAD R G, SWITKOWSKI Z E, et al. Nucl Phys A, 1976, 265:153. [11] DASMAHAPATRA B, CUJEC B, LAHLOU F, et al. Nucl Phys A, 1982, 384:257. [12] KOVAR D G, GEESAMAN D F, BRAID T H, et al. Phys Rev C, 1979, 20:1305. [13] CARNELLI P F F, ALMARAZ-CALDERON S, REHM K E, et al. Phys Rev Lett, 2014, 112:192701. [14] HAUSER W, FESHBACH H Phys Rev, 1952, 87:366. [15] AGUILERA E F, ROSALES P, MARTINEZ-QUIROZ E, et al. Phys Rev C, 2006, 73:064601.
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