Résonances dans la réaction 10B+α par L'étude des rayonnements γ détectés avec un semi-conducteur Ge(Li)

doi:10.1016/0375-9474(69)90887-2

Nuclear Physics A

Volume 123, Issue 1, 13 January 1969, Pages 27-32

https://doi.org/10.1016/0375-9474(69)90887-2 Get rights and content

Abstract

A Ge(Li) detector has been used to study gamma rays from the ¹⁰B(α, pγ)¹³C and ¹⁰B(α, α'γ)¹⁰B reactions. Relative cross sections for the 3.088, 3.682 3.852 and 0.717 MeV gamma rays have been obtained, and excitation curves at 90° for α-particles with energies from 1 to 3.5 MeV are given corresponding to excited levels between 12.3 and 14.1 MeV in ¹⁴N.

References (8)

F.L. Talbott et al.
Phys. Rev.
(1953)
E.S. Shire et al.
Phil. Mag.
(1953)
T.W. Bonner et al.
Phys. Rev.
(1956)
T.W. Bonner et al.
Bull. Am. Phys. Soc.
(1956)

There are more references available in the full text version of this article.

Cited by (12)

Levels of 14N near 13.7 MeV excitation from the analysis of Doppler-broadened γ-line shapes in the 10B(α, pγ)13C reaction
1983, Nuclear Physics, Section A
Excitation functions have been measured in the ¹⁰B(α, pγ)¹³C reaction by means of γ-detection. An enriched target and a Ge(Li) detector were used. The Doppler-broadened γ-line shape has been analysed, resulting in the angular distributions of protons for each bombarding energy. From a R-matrix analysis of these distributions, the parameters corresponding to three resonances have been determined.
The 10B(α, n) 13N13N* cross section for α-energies from 1.0 TO 5 MeV
1973, Nuclear Physics, Section A
The three neutron groups, populating the ground state, the 2.366 MeV state and the 3.51, 3.55 MeV doublet of ¹³N were studied. Differential cross section measurements between E_α = 1.0 and 5.0 MeV at 0, 90 and 160° showed fifteen resonances of which nine had not been seen before in this reaction. Angular distributions were taken at six α-energies. These confirmed the J^π = 3⁻ assignment of the 12.690 level in ¹⁴N and permitted a tentative assignment of J^π = 3⁻ to the 13.166 MeV level. Compound nucleus formation involving overlap of several resonances appears dominant, except for the neutron group to the doublet in ¹³N shows evidence for a direct reaction mechanism.
Radiative proton capture into 14N
1971, Nuclear Physics, Section A
The reactions ¹³C(p,γ_1,2)¹⁴N and ¹³C(p, p', γ(3.09, 3.68, 3.85))¹³C have been studied for E_p = 3.0 to 18 MeV, covering the giant dipole resonance in ¹⁴N. Below E_p = 7.0 MeV resonances in the γ₀ yield were found at E_p = 3.771 MeV (Γ_c.m.≦ 2keV), 4.53 (115 ± 10), 5.32 (48 ± 7) and 6.2 (1000 ± 150), corresponding to excitation energies of 11.049, 11.74, 12.485 and 13.3 MeV, respectively. From the angular distribution, J^π = 2⁺, 3⁺ was established for the 11.049 MeV state, which is thus a newly found excited state of ¹⁴N. In all other cases cross correlations exist with states reported in other reactions. The 13.3 MeV state is thought to be part of the giant dipole resonance. Above 7 MeV bombarding energy the (p, γ_o) yield shows broad structure and the giant dipole resonance with two peaks at 22.5 and 23.0 MeV excitation energy. All peaks can be related to structure observed in the inverse photonuclear (γ, p_o) reaction. The inverted (p, γ_o) cross section exhausts 18 % of the classical dipole sum-rule between 12 and 24 MeV. Angular distributions indicate that most of the GDR up to 24 MeV is related to J^π = 2⁻ states, in accordance with theoretical predictions.
The (p,γ₁) yield to the J^π = 0⁺, T = 1 state in ¹⁴N averages only $15$ of the γ₀ yield and no giant resonance structure is evident up to 24 MeV. The expectations for the T = 0 GDR based on the 2.31 MeV state are discussed. It is suggested that two narrow resonances seen at excitation energies of E_x = 23.7 MeV (Γ_c.m.≈ 500 keV) and 24.2 MeV (Γ_c.m.≈ 100 keV) are the lowest J^π = 1⁻, T = 2 states in ¹⁴N.
Energy levels of light nuclei A = 13-15
1970, Nuclear Physics, Section A
Mesures de vies moyennes dans 13C et 10B par la méthode du parcours de recul
1970, Nuclear Physics, Section A
Low-energy cross-section measurement of the B 10 (α,n) N 13 reaction and its impact on neutron production in first-generation stars LOW-ENERGY CROSS-SECTION MEASUREMENT OF THE ... Q. LIU et al.
2020, Physical Review C

View all citing articles on Scopus

View full text

RésuMatcher: A personalized résumé-job matching system
Expert Systems with Applications, Volume 60, 2016, pp. 169-182
Shiqiang Guo, …, Tracy Hammond
Development of a concept and basis for the DEMO diagnostic and control system
Fusion Engineering and Design, Volume 179, 2022, Article 113122
W. Biel, …, H. Zohm
Silicon carbide diodes for neutron detection
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 986, 2021, Article 164793
José Coutinho, …, Takahiro Makino
Real-time wall conditioning by controlled injection of boron and boron nitride powder in full tungsten wall ASDEX Upgrade
Nuclear Materials and Energy, Volume 19, 2019, pp. 384-389
A. Bortolon, …, R. Neu
Re-examination of astrophysical S-factor of proton capture ${}^{9}{Be} (p, {γ)}^{10} B$ in stellar matter
Nuclear Physics A, Volume 1007, 2021, Article 122118
Abdul Kabir, Jameel-Un Nabi
Design of Faraday cup ion detectors built by thin film deposition
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 848, 2017, pp. 87-90
G.A. Szalkowski, …, F.E. Cecil

Article preview

Nuclear Physics A

Abstract

References (8)

Phys. Rev.

Phil. Mag.

Phys. Rev.

Bull. Am. Phys. Soc.

Cited by (12)

Levels of <sup>14</sup>N near 13.7 MeV excitation from the analysis of Doppler-broadened γ-line shapes in the <sup>10</sup>B(α, pγ)<sup>13</sup>C reaction

The <sup>10</sup>B(α, n) <sup>13</sup>N<sup>13</sup>N<sup>*</sup> cross section for α-energies from 1.0 TO 5 MeV

Radiative proton capture into <sup>14</sup>N

Energy levels of light nuclei A = 13-15

Mesures de vies moyennes dans <sup>13</sup>C et <sup>10</sup>B par la méthode du parcours de recul

Low-energy cross-section measurement of the B 10 (α,n) N 13 reaction and its impact on neutron production in first-generation stars LOW-ENERGY CROSS-SECTION MEASUREMENT OF THE ... Q. LIU et al.