Reaction mechanisms in 24Mg+ 12C and 32S+ 24Mg (original) (raw)

Binary reaction decays from 24 Mg + 12 C

Phys. Rev. C 80 034604, 2009

Charged-particle and γ decays in 24 Mg * are investigated for excitation energies where quasimolecular resonances appear in 12 C + 12 C collisions. Various theoretical predictions for the occurrence of superdeformed and hyperdeformed bands associated with resonance structures with low spin are discussed within the measured 24 Mg * excitation energy region. The inverse kinematics reaction 24 Mg + 12 C is studied at E lab (24 Mg) = 130 MeV, an energy that enables the population of 24 Mg states decaying into 12 C + 12 C resonant breakup states. Exclusive data were collected with the Binary Reaction Spectrometer in coincidence with Euroball IV installed at the Vivitron tandem facility at Strasbourg. Specific structures with large deformation were selectively populated in binary reactions, and their associated γ decays studied. Coincident events associated with inelastic and α-transfer channels have been selected by choosing the excitation energy or the entry point via the two-body Q values. The analysis of the binary reaction channels is presented with a particular emphasis on 24 Mg-γ, 20 Ne-γ , and 16 O-γ coincidences. New information (spin and branching ratios) is deduced on high-energy states in 24 Mg and 16 O, respectively.

ALPHA-CLUSTER STATES POPULATED IN 24 MG + 12 C

Charged particle and γ-decays in light α-like nuclei are investigated for 24 Mg+ 12 C. Various theoretical predictions for the occurence of superdeformed and hyperdeformed bands associated with resonance structures with low spin are presented. The inverse kinematics reaction 24 Mg+ 12 C is studied at E lab (24 Mg) = 130 MeV. Exclusive data were collected with the Binary Reaction Spectrometer in coincidence with EUROBALL IV installed at the VIVITRON Tandem facility at Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their associated γ-decays studied. Coincident events from α-transfer channels were selected by choosing the excitation energy or the entry point via the two-body Q-values. The analysis of the binary reaction channels is presented with a particular emphasis on 20 Ne-γ and 16 O-γ coincidences.

Structure of 24^{24}24Mg Excited States and Their Influence on Nucleosynthesis

Acta Physica Polonica B

The main idea of the two presented experiments is to study the decay of resonances in 24 Mg at excitation energies above the 12 C+ 12 C decay threshold, in the astrophysical energy region of interest. The measurement of the 12 C(16 O,α) 24 Mg* reaction was performed at INFN-LNS in Catania. Only the α+ 20 Ne decay channel of 24 Mg is presented here, because it was a motivation for conducting a new experiment, a study of the 4 He(20 Ne, 4 He) 20 Ne reaction, performed at INFN-LNL in Legnaro. Some preliminary results of this measurement are also presented.

The 721, 809, 839 and 954 keV resonances of the Mg26 (p, γ) reaction

Nuclear Physics, 1962

Gamma ray spectra and angular correlation measurements have been obtained at the 721, 809, 839 and 954 keV resonances of the MgZS(p, F) reaction. On the basis of these measurements, spins have been assigned to the 809({), 839(½) and 954({) keV resonances No definite assignment could be made to the 2 2 MeV level of A1 zT.

The reaction 26Mg(d, τ)25Na and the structure of 25Na

Nuclear Physics A, 1973

The nuclear structure of the nucleus 25Na has been studied with the (d, 7) proton pick-up reaction on 26Mg at a bombarding energy of 29 MeV with an energy resolution of 25 to 30 keV FWHM. Excited states in 25Na have been measured up to excitation energies of 8 MeV. The experimental angular distributions show good agreement with the predictions from the standard distorted-wave Born-approximation theory (code DWUCK; non-local and finite range). However, the agreement is improved considerably if the procedure of Kunz, Rost and Johnson is applied which accounts approximately for strong couplings to inelastic channels in the initial and final (strongly deformed) nuclei. The influence of this treatment on the evaluation of spectroscopic factors has been investigated and was found to be particularly pronounced for l = 0 transitions. The measured spectroscopic factors are compared to those from other experimental work and from shell-model and Nilsson-model calculations. [ El NUCLEAR REACTIONS Z6Mg(d, ZHe), E=29 MeV; measured ~r(0). 25Na I deduced levels, l, ~, S. Enriched target. University of Michigan Ford Nuclear Reactor. The decay of the y-lines following the fl-decay of 27Mg was measured in a Ge detector for several half-lives. A second value was deduced from the yield of deuterons elastically scattered from 26Mg in the angular range 200-35 ° . The value was obtained by comparing the experimental 26Mg(d, r)2SNa

Excited states in 22Mg via the 12C(12C,2n)22Mg reaction

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2007

The 12 C(12 C, 2n) 22 Mg reaction was measured with the CLARION array and the RMS separator at the Holifield Facility of Oak Ridge National Laboratory. This experiment was performed to gather more information on the excited states in 22 Mg, which might be of relevance to recent radioactive ion beam measurements of the astrophysically important 21 Na(p, c) 22 Mg reaction. The results are compared to direct measurements, transfer experiments and a competing experiment performed with Gammasphere.

THE REACTION 26 Mg ( d , x ) 2 SNa AND THE STRUCTURE OF 2 SNa

2002

The (d, 6Li) reaction on 24Mg, 26Mg and 28Si at 35 MeV

Nuclear Physics A, 1976

Data for the (d, eLi) reaction on targets of 24Mg, 2eMg and 2sSi have been obtained at 35 MeV bombarding energy. Angular distributions were measured for low-lying statesin the residual nuclei. Tern-range distorted-wave Born approximation (DWBA) calculations have been used to analyze the daJ_a_, The DWBA calculations account for the shapes of the experimental distributions reasonably well. The observation of significant population of unnatural parity states implies, however, that other transfer mechanisms may be important. The experimental spectrmcopic factors are in qualitative agreement with those obtained from SU(3) theory. E ] NUCLEAR REACTIONS "'Mg, "Mg, "8Si(d: eLi), E~ 35 MeV; measured or(0). ' [ a°.a:~Ne, 24Mg levels deduced S~.

Quasimolecular states ofMg24excited in theO16+12C interaction

Physical Review C, 1994

The study of the ' 0+' C~' C +' C + a reaction performed at E(' O)=113 MeV shows evidence for the excitation of resonant states of Mg, eventually decaying in the C+ C channel, with a width of about 500 keV. From the angular correlation of the two emitted C ions a value J = 14 is obtained for the spin of two resonances at 35.1 and 36.3 MeV excitation energy. This allows for an interpretation in terms of quasimolecular states of Mg. The data are compared with previous results obtained at 85 MeV incident energy, and the role of the angular momentum transfer in the reaction process is discussed.

AIP-FUSION08-1098-p207-212ND.pdf

The occurence of "exotic" shapes in light N=Z α-like nuclei is investigated for 24 Mg+ 12 C and 32 S+ 24 Mg. Various approaches of superdeformed and hyperdeformed bands associated with quasimolecular resonant structures with low spin are presented. For both reactions, exclusive data were collected with the Binary Reaction Spectrometer in coincidence with EUROBALL IV installed at the VIVITRON Tandem facility of Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their associated γ-decays studied. The analysis of the binary and ternary reaction channels is discussed.

Reaction mechanisms in 24Mg+ 12C and 32S+ 24Mg (original) (raw)

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