Total reaction and transfer cross sections for 11B + 9Be and 13C + 9Be reactions at low energies

doi:10.1016/0375-9474(84)90145-3

Nuclear Physics A

Volume 427, Issue 1, 1 October 1984, Pages 186-204

https://doi.org/10.1016/0375-9474(84)90145-3 Get rights and content

Abstract

The total reaction cross sections for ¹¹B + ⁹Be and ¹³C + ⁹Be have been measured by the total γ-ray yield method over the energy intervals E_c.m. = 1.4–4.4 MeV and E_c.m. = 2.0–5.2 MeV, respectively. The cross sections for the neutron transfer reactions ¹¹B(⁹Be, ⁸Be)¹²B, leading to the ¹²B 0.953 and 1.674 MeV states, and ¹³C(⁹Be, ⁸Be)¹⁴C, leading to the ¹⁴C 6.094, 6.728 and 6.902 MeV states, have been obtained from the yields of the characteristic γ-rays. The α-transfer reaction ¹¹B(⁹Be, ⁵He)¹⁵N, leading to many unresolved ¹⁵N states, has been observed with large cross section. There is, however, no evidence for the ¹³C(⁹Be, ⁵He)¹⁷O transfer process in the ¹⁷O + nα channels. This different behaviour of the ¹¹B + ⁹Be and ¹³C + ⁹Be systems seems to indicate that the α-transfer reaction at sub-barrier energies is not a direct transfer process, and that it probably occurs via molecular state formation.

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Cited by (11)

Energy levels of light nuclei A = 12
2017, Nuclear Physics A
Citation Excerpt :
For theoretical analyses, see (10Be: [1999BR09,2000AB31,2009RO31]) and (11Be: [1995EV01,1996EV01,1996VO04,1997AL05,1997JO16,1998TO05,1999BR09,1999FO13,2000BO45,2000JO21,2002AL25,2002BO25,2002SU18,2002TA31,2003TA04,2005BA72,2005TA34,2009HA18,2010LA09,2011OG09,2011OG10,2015IS03,2015LU04]). The relative population of elastic and inelastic channels is very energy dependent, for example, because of structure effects and molecular-like states in 24Mg; see references listed in [1975AJ02,1980AJ01,1985AJ01,1990AJ01], and see footnote a in Table 12.40. The spin alignment of 12C*(9.64) was studied in [1993DA22,1995DA05] and shows little energy dependence.
Energy levels of light nuclei A=11
2012, Nuclear Physics A
Energy levels of light nuclei A = 8,9,10
2004, Nuclear Physics A
Fusion cross sections for 6Li+12C and 6Li+13C reactions at low energies
1998, Nuclear Physics A
The partial cross sections for the ⁶Li+¹²C and ⁶Li+¹³C reactions below and above the Coulomb barrier energy have been determined from the cross sections of the characteristic γ-rays measured with HPGe detectors and using the branching factor $σ_{γ} σ_{ch}$ obtained from the statistical model calculations. The fusion cross sections obtained from the sum of these partial cross sections are found to be equal to the total reaction cross sections upto an energy well above the Coulomb barrier energy and there appears to be no evidence for limitation of fusion cross sections for these systems at such energies contrary to the evaporation residue measurements. The measured cross sections are also found to agree nicely with the IWBC (Incoming Wave Boundary Condition) and one-dimensional BPM (Barrier Penetration Model) calculation.
Fusion cross sections for 7Li + 11B and 9Be + 9Be reactions at low energies
1997, Nuclear Physics A
The partial cross sections for the $^{7} Li +^{11} B$ and $^{9} Be +^{9} Be$ reactions below and above the Coulomb barrier energy have been determined from the cross sections of the characteristic γ-rays of the residual nuclei and using the branching factor $σ_{γ} σ_{ch}$ obtained from the statistical model calculations. The fusion cross sections obtained from the sum of these partial cross sections are found to be equal to the total reaction cross sections upto an energy well above the Coulomb barrier energy for the $^{9} Be +^{9} Be$ reaction. For the $^{7} Li +^{11} B$ reaction, however, the fusion cross sections are found to be less than the total reaction cross sections at energies not much above the Coulomb barrier.
The maximum fusion cross sections for the $^{7} Li +^{11} B$ and $^{9} Be +^{9} Be$ reactions are found to be ∼66% and ∼81% of the total reaction cross sections at E_c.m. = 2B_c (where B_c is the Coulomb barrier energy), respectively.
Heavy ion reactions below the Coulomb barrier
1994, Nuclear Physics, Section A
Heavy ion reactions in the sub-barrier region are of interest for the importance of ¹²C + ¹²C, ¹²C + ¹⁶O and ¹⁶O + ¹⁶O in astrophysics. Systematic studies of the light heavy ion pairs are necessary to understand the interaction potentials. In this article, different experimental techniques are reviewed. Theoretical approaches such as the optical model, IWBC model and the inversion method are discussed. Up to this day, no theoretical method gives satisfactory explanation to the heavy ion systems. More experimental works are still needed in order to reveal the influence of nuclear structure in the reaction mechanism.

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^☆: This work was supported in part by the Natural Sciences and Engineering Research Council of Canada.

^†: Present address: Physics Department, University of Burdwan, Burdwan 713104, West Bengal, India.

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Nuclear Physics A

Abstract

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Cited by (11)

Energy levels of light nuclei A = 12

Energy levels of light nuclei A=11

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Fusion cross sections for <sup>6</sup>Li+<sup>12</sup>C and <sup>6</sup>Li+<sup>13</sup>C reactions at low energies

Fusion cross sections for <sup>7</sup>Li + <sup>11</sup>B and <sup>9</sup>Be + <sup>9</sup>Be reactions at low energies

Heavy ion reactions below the Coulomb barrier

Total reaction and transfer cross sections for 11B + 9Be and 13C + 9Be reactions at low energies☆

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Total reaction and transfer cross sections for ¹¹B + ⁹Be and ¹³C + ⁹Be reactions at low energies☆