The 12C(p, γ) reaction from 10 to 50 MeV

doi:10.1016/0029-5582(63)90787-9

Nuclear Physics

Volume 45, July–August 1963, Pages 113-122

https://doi.org/10.1016/0029-5582(63)90787-9 Get rights and content

Abstract

The excitation functions for radiative proton capture reactions leading to the ¹³N ground state ( $^{12} C (p, γ_{0})^{13} N$ ) and to a state at 3.5 MeV in $^{13} N (^{12} C (p, γ_{2})^{13} N^{∗})$ have been measured with incident proton energies from 10 to 48.5 MeV. The excitation function for the ground state reaction shows strong peaks at excitations in ¹³N of 13, 20 and 32.5 MeV. If these are interpreted as the regions of strong E1 radiative strength the results are in good agreement with the $T = 12$ dipole states predicted in the shell model calculations of Easlea. The excitation function for radiative capture to the excited state has a peak at an excitation of 24.5 MeV in ¹³N and above that energy falls slowly with increasing energy, being still detectable at the maximum proton energy of 48.5 MeV.

References (15)

H.E. Gove et al.
Nuclear Physics
(1961)
G.E. Brown et al.
Nuclear Physics
(1961)
B.R. Easlea
Phys. Lett.
(1962)
D.F. Measday et al.
Nuclear Physics
(1963)
A.M. Lane
Nuclear Physics
(1959)
S.G. Cohen et al.
Phys. Rev.
(1961)
N.W. Tanner et al.

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

Cited by (27)

Proton radiative capture to 13N at beam energies of 40 to 54 MeV
1994, Nuclear Physics, Section A
The reaction ¹²C(p,γ)¹³N has been studied for 40 MeV ⩽ E_p ⩽ 54 MeV with a large-volume anticoincidence NaI spectrometer. Angular distributions have been measured for excited states up to 11 MeV. We observe transitions to states having a dominant single-particle character and also states with an excited 2²¹²C core. We compare the data to a direct semi-direct model calculation. There is no evidence for excitation of the second harmonic of the giant dipole resonance. Structure observed near E_γ = 24 MeV may be due to ¹²C(p,ṕγ).
Proton and deuteron radiative capture to A = 13 nuclei
1991, Nuclear Physics, Section A
Differential capture ¹²C(p, γ)¹³N and ¹¹B(d, γ)¹³C cross sections have been measured in the excitation energy region between 20 and 45 MeV in ¹³N and 25 and 42 MeV in ¹³C. Angular distributions are given for the pγ channel at each energy, while the dγ excitation function has been measured at 60°. The pγ₀ data show, besides a direct capture term, the excitation of giant dipole resonances based on excited states of the compound nucleus. The main feature of the deuteron capture cross section can be understood in terms of a mechanism in which the proton-neutron pair is captured in the same single particle configuration by the ¹¹B core.
The giant dipole resonance in light nuclei and related phenomena
1986, Physics Reports
The present-day status of the giant dipole resonance (GDR) in light nuclei is discussed with main emphasis on the supermultiplet and configurational splitting of GDR, which are its most important features. A great wealth of experimental data, which confirm the existence of the above phenomenon are presented. Consideration is also given to the related problems, such as radiative pion capture and muon capture, spin-isospin dipole excitations, the role of the supermultiplet structure of nuclear levels in the formation of hypernuclear states in processes of the coherent substitution of hyperons for nucleons.
Investigation of the electric quadrupole strength in 13N using the 12C(p, γ<inf>0</inf>)13N reaction
1980, Nuclear Physics, Section A
Cross sections for the $^{12} C (p, γ_{0})^{13} N$ reaction have been measured from $E_{p= 10MeV to17MeV}$ in the laboratory system by bombarding an enriched carbon-12 target with a beam of polarized protons. A 25 cm diameter × 25 cm Nal(Tl) detector with a plastic anti-coincidence shield was used to detect the gamma rays. The total E2 capture cross sections were of the order of 0.2 μb and no resonance effects were observed. The amount of the E2 energy-weighted sum rule depleted in this energy range is (8.5 ± 3.3)%. Calculations based on a direct semi-direct capture model provide a good description of the experimental results by including only direct E2 capture and direct plus collective El capture.
Continuously produced, high specific activity 11C for studies of photosynthesis, transport and metabolism
1978, The International Journal Of Applied Radiation And Isotopes
A continuous supply of high specific activity ¹¹CO₂ was produced for studies of photosynthesis, transport, metabolic utilization, and storage in plants. The reaction ¹²C(p,d) ¹¹C from a 35 MeV proton beam on a 300 cm³ gaseous ¹²CO₂ target yielded 7.7 × 10⁵ atoms/μA/sec in a flow of 1 cm³/sec, and yielded 2.1 × 10⁹¹¹C atoms/μA/sec from a dry ice target. The resultant ¹¹CO was purified (in air), then oxidized to ¹¹CO₂, and ¹²CO₂ was added in known amounts to produce the mixture air/¹²CO₂/¹¹CO₂ of known concentration and specific activity.
By analyzing pulse-fronts and steady-state labelling levels in an individual plant it is possible to extract considerably more information about uptake rates, product pool sizes and turnover rates, transport velocities and concentrations, metabolic sink strengths, and other parameters, than would be attainable by pulse methods alone.
The high yields of ¹¹C and potentially of ¹³N by these and related methods would also be of use in radiopharmaceuticals and biomedical tracers.
Photoreactions in 13C in the 2p-1h continuum shell model
1977, Nuclear Physics, Section A

View all citing articles on Scopus

^†: Now at Harvard University, Cambridge, Massachusetts, U.S.A.

^††: On leave from: Lebedev Physical Institute, Moscow, U.S.S.R.

^‡: On leave from: Physical and Technical Institute of the Academy of Sciences, Kharkov, U.S.S.R.

View full text

Characterization of a 2 $\times$ 2 array of large square bars of LaBr₃:Ce detectors with $γ$ -rays up to 22.5 MeV
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 883, 2018, pp. 183-190
M. Dhibar, …, G. Anil Kumar
Measurement of NORM samples with CeBr₃ detectors
Applied Radiation and Isotopes, Volume 126, 2017, pp. 307-310
Virginia Peyres, …, Eduardo García-Toraño
A nonlocal optical model for neutron scattering from light 1p-shell nuclei
Nuclear Physics A, Volume 989, 2019, pp. 145-167
T. Aqel, M.I. Jaghoub
Neutron efficiency of LaBr₃:Ce detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 768, 2014, pp. 124-129
A. Ebran, …, O. Delaune
Precision measurement of the angular distribution for the ¹⁶O(d, p)¹⁷O transfer reaction to the ground state of ¹⁷O
Nuclear Physics A, Volume 986, 2019, pp. 26-33
T.L. Ma, …, W.P. Liu
Measurement of proton induced thick target γ-ray yields on B, N, Na, Al and Si from 2.5 to 4.1 MeV
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 366, 2016, pp. 77-82
M. Chiari, …, K. Preketes-Sigalas

Article preview

Nuclear Physics

Abstract

References (15)

Nuclear Physics

Nuclear Physics

Phys. Lett.

Nuclear Physics

Nuclear Physics

Phys. Rev.

Cited by (27)

Proton radiative capture to <sup>13</sup>N at beam energies of 40 to 54 MeV

Proton and deuteron radiative capture to A = 13 nuclei

The giant dipole resonance in light nuclei and related phenomena

Investigation of the electric quadrupole strength in <sup>13</sup>N using the <sup>12</sup>C(p, γ<inf>0</inf>)<sup>13</sup>N reaction

Continuously produced, high specific activity <sup>11</sup>C for studies of photosynthesis, transport and metabolism

Photoreactions in <sup>13</sup>C in the 2p-1h continuum shell model