New measurement of the excited states in B11 via elastic resonance scattering of Be10+p

Y. D. Liu (刘应都), H. W. Wang (王宏伟), Y. G. Ma (马余刚), X. G. Cao (曹喜光), G. Q. Zhang (张国强), D. Q. Fang (方德清), M. Lyu (吕明), W. B. He (何万兵), Z. T. Dai (代智涛), C. Li (李琛), C. L. Zhou (周铖龙), S. Q. Ye (叶绍强), C. Tao (陶城), J. Wang (王佳), S. Kumar, J. L. Han (韩建龙), Y. Y. Yang (杨彦云), P. Ma (马朋), J. B. Ma (马军兵), S. L. Jin (金仕纶), Z. Bai (白真), L. Jin (金磊), D. Yan (闫铎), and J. S. Wang (王建松)
Phys. Rev. C 91, 044302 – Published 6 April 2015

Abstract

The elastic resonance scattering protons decayed from B11 to the ground state of Be10 were measured by using the thick-target technique in inverse kinematics at the Heavy Ion Research Facility in Lanzhou (HIRFL). The obtained excitation functions were well described by a multichannel R-matrix procedure under the kinematics process assumption of resonant elastic scattering. The excitation energy of the resonant states ranges from 13.0 to 17.0 MeV, and their resonant parameters such as the resonant energy Ex, the spin-parity Jπ, and the proton-decay partial width Γp were determined from R-matrix fits to the data. Two of these states around Ex=14.55 MeV [Jπ=(3/2+,5/2+),Γp=475±80 keV] and Ex=14.74 MeV [Jπ=3/2,Γp=830±145 keV], and a probably populated state at Ex=16.18 MeV [Jπ=(1/2,3/2),Γp<60 keV], are respectively assigned to the well-known states in B11 at 14.34, 15.29, and 16.43 MeV. The isospin of these three states were previously determined to be T=3/2, but discrepancies exist in widths and energies due to the current counting statistics and energy resolution. We have compared these states with previous measurements, and the observation of the possibly populated resonance is discussed.

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  • Received 20 December 2014

DOI:https://doi.org/10.1103/PhysRevC.91.044302

©2015 American Physical Society

Authors & Affiliations

Y. D. Liu (刘应都)1,2, H. W. Wang (王宏伟)1, Y. G. Ma (马余刚)1,3,*, X. G. Cao (曹喜光)1, G. Q. Zhang (张国强)1, D. Q. Fang (方德清)1, M. Lyu (吕明)1,2, W. B. He (何万兵)1,2, Z. T. Dai (代智涛)1,2, C. Li (李琛)1, C. L. Zhou (周铖龙)1, S. Q. Ye (叶绍强)1,2, C. Tao (陶城)1,2, J. Wang (王佳)1,2, S. Kumar1, J. L. Han (韩建龙)4, Y. Y. Yang (杨彦云)4,2, P. Ma (马朋)4, J. B. Ma (马军兵)4, S. L. Jin (金仕纶)4,2, Z. Bai (白真)4,2, L. Jin (金磊)4, D. Yan (闫铎)4, and J. S. Wang (王建松)4

  • 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Shanghai Tech University, Shanghai 200031, China
  • 4Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

  • *ygma@sinap.ac.cn

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Vol. 91, Iss. 4 — April 2015

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