Ultradipole photon production in 40 and 50 MeV α-nucleus collisions

Sharan, M.; Agarwal, Y.K.; Baba, C.V.K.; Chakrabarty, D. R.; Datar, V. M.

doi:10.1103/physrevc.48.2845

Cited by 6 publications

(8 citation statements)

References 31 publications

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“…Also we estimated the bremsstrahlung spectra for scattering of α-particles off the 107 Ag nuclei at energy of beam of the α-particles of 50 MeV [for calculations we choose nucleus 107 Ag, while nat Ag was used in experiments, see Ref. [99]]. For 107 Ag we observe similar pictures (see Fig.…”

Section: F Bremsstrahlung Emission Formentioning

confidence: 65%

“…Here, black rectangles are experimental data (Sharan 1993: Ref. [99]), blue solid line is the calculated spectrum in the multipole approach, green dash-dotted line is the calculated spectrum in the dipole approach, purple dashed line is calculation with new normalization (see text for explanation). Panel (a): Calculations on multipole VS dipole approaches.…”

Section: G Emission Of Electric Type Formed Due To Relative Motions O...mentioning

confidence: 99%

“…We suppose that these photons give independent information about internal mechanisms during scattering. Bremsstrahlung photons in energy range about 5-35 MeV were measured in scattering of α + 197 Au, 159 Tb at E α = 40 MeV and α + 197 Au, 116 Sn, nat Ag, 59 Co at E α = 50 MeV at Variable Energy Cyclotron Centre, Calcutta [99]. Such experimental data were analyzed by statistical model for photon energies up to the giant dipole resonance region, and were analyzed for hither photon energies in terms of the potential bremsstrahlung and incoherent nucleonnucleon bremsstrahlung processes [see Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Such experimental data were analyzed by statistical model for photon energies up to the giant dipole resonance region, and were analyzed for hither photon energies in terms of the potential bremsstrahlung and incoherent nucleonnucleon bremsstrahlung processes [see Ref. [99]]. We are interesting in physics of these reactions via self-consistent analysis on the fully quantum basis.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we generalize out bremsstrahlung theory [2,[60][61][62][63][64][65][66][67][68][69][70][71][72][73] and apply it for analysis of data [99]. As energy region of the measured photons in the α-nucleus scattering is essentially larger than in α-decay (there are experimental data for the bremsstrahlung in α decay for four nuclei: 210 Po [100-104], 214 Po [62], 226 Ra [63] and 244 Cm; here energies of experimental bremsstrahlung probabilities are not larger than 500 keV), we focus on extracting new information about coherent and incoherent emissions in elastic scattering, different electric and magnetic contributions, inelastic mechanisms in this reaction via analysis of bremsstrahlung emission.…”

Section: Introductionmentioning

confidence: 99%

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Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Maydanyuk¹,

Zhang²,

Zou³

2019

Preprint

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We investigate emission of bremsstrahlung photons during scattering of α-particles off nuclei. For that, we construct bremsstrahlung model for α-nucleus scattering, where a new formalism for coherent and incoherent bremsstrahlung emissions in elastic scattering and mechanisms in inelastic scattering is added. Basing of this approach, we analyze experimental bremsstrahlung cross-sections in the scattering of α-particles off the 59 Co, 116 Sn, nat Ag and 197 Au nuclei at 50 MeV of α-particles beam measured at the Variable Energy Cyclotron Centre, Calcutta. We observe oscillations in the calculated spectra for elastic scattering for each nucleus. But, for 59 Co, 116 Sn and nat Ag we obtain good agreement between calculated coherent spectrum with incoherent contribution for elastic scattering with experimental data in the full photon energy region. For heavy nucleus 197 Au we find that (1) Oscillating behavior of the calculated spectrum of coherent emission in elastic scattering is in disagreement with experimental data, (2) Inclusion of incoherent emission improves description of the data, but summarized spectrum is in satisfactory agreement with the experimental data. To understand unknown modification of wave function for scattering, we add new mechanisms of inelastic scattering to calculations and extract information about unknown new amplitude of such mechanisms from experimental data analysis. This amplitude has maxima at some energies, that characterizes existence of states of the most compact structures (clusters) in nucleus-target. We explain origin of oscillations in the bremsstrahlung spectra for elastic scattering (at first time). New information about coherent and incoherent contributions is extracted for studied reactions.

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Section: F Bremsstrahlung Emission Formentioning

confidence: 65%

Section: G Emission Of Electric Type Formed Due To Relative Motions O...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Maydanyuk¹,

Zhang²,

Zou³

2019

Preprint

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Nonstatistical γ emission in−3and α-induced reactions

et al. 1996

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We have measured inclusive ␥-ray production cross sections for 3 He-and ␣-induced reactions on various targets in the mass range Aϭ61-181 at projectile energies of 11-27 MeV. Except for ␣-induced yields on the lightest targets, all reactions show high-energy ␥-ray yields 1-3 orders of magnitude larger than can be obtained from statistical model calculations. Angular distributions are strongly forward peaked in the center of mass frame for the highest ␥-ray energies, providing model-independent evidence for a nonstatistical reaction mechanism. Calculations of direct radiative capture and semidirect excitation of the giant dipole resonance can qualitatively reproduce the angular distributions but cannot reproduce either the dependence of the ␥-ray cross sections on E ␥ or the target dependence of the absolute cross sections. The 12 C( 3 He,␥ 0 ) 15 O reaction was found to change from predominantly statistical to predominantly direct over this bombarding energy range.

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Study of nuclear shapes in Tl isotopes via excited state giant dipole resonance studies in the reactionO16
Chakrabarty
¹
,
Datar
²
,
Choudhury
³

et al. 1996
Phys. Rev. C
10
1
2
0
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The present paper describes the measurement of high energy gamma rays (ϳ5 -22 MeV͒ in the reaction 16 Oϩ 181 Ta. Singles measurements were performed at E( 16 O͒ϭ84, 89, and 107 MeV and the multiplicity gated measurements along with the angular distributions were made at E( 16 O͒ϭ94 MeV. It is seen that the Tl nuclei are nonspherical at the excitation energies and spins relevant for the present work. The angular distribution data can be explained only by incorporating large orientation fluctuations. An attempt has been made to extract information on shape fluctuations directly from the ␥ spectra. Under the restriction of using a common ''intrinsic'' strength function characterized by E 0 and ⌫ 0 for the multiplicity gated data sets, a small increase of the effective mean deformation and a drive towards triaxiality (␥ϳ 30°) with angular momentum is brought out. If this restriction is relaxed, however, the data can be understood also with a smaller value of ␥. The singles data can be understood within the same framework with a higher value of ⌫ 0 .

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Ultradipole photon production in 40 and 50 MeV α-nucleus collisions

Cited by 6 publications

References 31 publications

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Nonstatistical γ emission in−3and α-induced reactions

Study of nuclear shapes in Tl isotopes via excited state giant dipole resonance studies in the reactionO16
Chakrabarty
¹
,
Datar
²
,
Choudhury
³

et al. 1996
Phys. Rev. C
10
1
2
0
View full text Add to dashboard Cite

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Ultradipole photon production in 40 and 50 MeV α-nucleus collisions

Cited by 6 publications

References 31 publications

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Nonstatistical γ emission in−3and α-induced reactions

Study of nuclear shapes in Tl isotopes via excited state giant dipole resonance studies in the reactionO16Chakrabarty1, Datar2, Choudhury3 et al. 1996Phys. Rev. C10120View full textAdd to dashboardCite

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Product

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About

Study of nuclear shapes in Tl isotopes via excited state giant dipole resonance studies in the reactionO16
Chakrabarty
¹
,
Datar
²
,
Choudhury
³

et al. 1996
Phys. Rev. C
10
1
2
0
View full text Add to dashboard Cite