Evidence for Orbital Dispersion in the Fragmentation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>16</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>at 90 and 120 MeV/Nucleon

Bibber, K. van; Hendrie, D.L.; Scott, D.K.; Weiman, H.; Schroeder, L. S.; Geaga, Jorge V.; Cessin, S. A.; Treuhaft, R. N.; Grossiord, Y. J.; Rasmussen, J. O.; Wong, Cheuk‐Yin

doi:10.1103/physrevlett.43.840

Cited by 98 publications

(34 citation statements)

References 7 publications

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“…It is interesting to note that similar results have been found [10,11] in studies of projectile fragmentation of heavy ions at a few hundred MeV/amu where the break-up mechanism is thought to have the character of a fast abrasion process, different from breakup fusion or transfer of the participant cluster into highly excited states at energies of the transitional region (see discussion in [6]). Under the assumption of independently moving nucleons forming the projectile, Goldhaber [12] has argued that the variance of the longitudinal momentum distribution of the fragment (in the projectile frame) is given by …”

Section: Introductionmentioning

confidence: 51%

Orbital dispersion and wavefunction mapping in inclusive break-up experiments

Srivastava

Basu

Rebel

et al. 1990

Z. Physik A - Atomic Nuclei

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Inclusive break-up cross sections of the reactions 12C (6Li, a)X and 2~ (6Li, a)X at 26 MeV/amu, observed for the emission of break-up fragment into the forward hemisphere, are analysed in view of the information about the internal momentum distribution of the projectile. The longitudinal momentum distribution of the fragments in the projectile rest-frame is found to reflect the internal momentum distribution of the clusters whereas the transverse distribution is affected by the projectile-target interaction.

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Section: Introductionmentioning

confidence: 51%

Orbital dispersion and wavefunction mapping in inclusive break-up experiments

Srivastava

Basu

Rebel

et al. 1990

Z. Physik A - Atomic Nuclei

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“…The widths of the perpendicular momentum distributions presented in Figure 4 were compared to the empirical description by Van Bibber et al that adds a term to the definition of parallel width by Goldhaber [1] to include a contribution from the orbital deflection of the projectile by the target in addition to the intrinsic nucleon motion of the fragment that generates the longitudinal width [10]:…”

Section: B Perpendicular Momentum Distributionsmentioning

confidence: 99%

“…Unlike the parallel component which mostly reveals the amount of energy dissipated in the reaction, the perpendicular component is more sensitive to the reaction mechanism. The first measurement of the transverse momentum for projectile fragments by Van Bibber et al used a 16 O beam at 90 and 120 MeV/nucleon [10]. The authors concluded that the width of the perpendicular momentum distribution can be described by adding a term to the parallel width given by Goldhaber that accounts for the orbital deflection of the projectile by the target during fragmentation.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the momentum distribution with mass loss in projectile fragmentation reactions

et al. 2012

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Background: Momentum distributions of fragmentation products as a function of fragment mass have been used to study the fragmentation mechanism. The parallel component of the momentum distribution has been well studied previously and modeled. The perpendicular component however is much less measured or understood.Purpose: Measure both components of the linear momentum of a wide range of fragmentation products and compare the widths of the momentum distributions to previous results and descriptions.Method: The parallel and perpendicular components of the momentum vector have been measured for projectilelike fragments produced in the reactions of 76 Ge with 9 Be and 197 Au at 130 MeV/nucleon in a magnetic spectrometer.Results: The measured parallel momentum distributions of all fragments follow established systematics. The perpendicular momentum distributions of fragments produced by fragmentation by the 197 Au target with masses near that of the projectile exhibit a clear peak near the momentum corresponding to the grazing angle that diminishes with decreasing fragment mass. Conclusions:The interplay between Coulomb and nuclear scattering can be used to describe results for the most peripheral collisions.

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“…In [4], the observed P L distribution was analyzed with an asymmetric Gaussian function, and the systematic deceleration e↵ect was also provided. Concerning the transverse momentum (P T ), the observed width was broader than that of the P L distribution, and an additional orbital dispersion e↵ect was proposed to understand the anisotropy at E ⇠ 100 MeV/u in [5]. In order to confirm the reliability of a formulation introduced in [5], more systematic measurements of P T distributions are required.…”

Section: Introductionmentioning

confidence: 99%

“…Concerning the transverse momentum (P T ), the observed width was broader than that of the P L distribution, and an additional orbital dispersion e↵ect was proposed to understand the anisotropy at E ⇠ 100 MeV/u in [5]. In order to confirm the reliability of a formulation introduced in [5], more systematic measurements of P T distributions are required. Systematic information on the momentum distribution of PLFs is required to provide the production cross sections of PLFs.…”

Section: Introductionmentioning

confidence: 99%

Systematic Investigation on Momentum Distributions of Projectile-like Fragments at E/A = 290 MeV

Momota¹,

Kanazawa²,

Kitagawa³

et al. 2011

J. Korean Phy. Soc.

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A systematic investigation on the longitudinal and transverse momentum (PL and PT) distributions of projectile-like fragments (PLFs) produced at intermediate energies has been performed experimentally. The momentum distributions of PLFs in a broad range of mass and charge, produced from 290 MeV/u Ar-and Kr-beams with various targets (C, Al, Nb, Tb and Au), were observed. The analysis of PL distributions with an asymmetric Gaussian function provides the deceleration e↵ect and the width of the distributions with good precision. A definite systematics is found in both the deceleration e↵ect and the width. The broader width obtained at the low-momentum side indicates the contribution of multi-step processes at this energy. The target and energy dependencies of the induced momentum width are also shown. The analysis of PT distributions with an o↵-centered Gaussian function provides not only the width, but also the orbital-deflection e↵ect. In principle, the width is independent on the target, and is consistently reproduced based on the previously proposed formulation. In contrast, the deflection e↵ect shows a strong target dependence. In the case of one-nucleon removed fragments, the main part of the deflection e↵ect can be understood by the Coulomb repulsion. The systematics of the momentum distributions, shown in the present studies, is important for evaluating the production cross sections of PLFs. Especially, the PT distribution is crucial to deduce production cross sections from the production rates of PLFs, which are observed at the forward angle within the limited angular acceptance.PACS numbers: 29.25.-t, 25.40.-h

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Evidence for Orbital Dispersion in the Fragmentation ofO16at 90 and 120 MeV/Nucleon

Cited by 98 publications

References 7 publications

Orbital dispersion and wavefunction mapping in inclusive break-up experiments

Orbital dispersion and wavefunction mapping in inclusive break-up experiments

Evolution of the momentum distribution with mass loss in projectile fragmentation reactions

Systematic Investigation on Momentum Distributions of Projectile-like Fragments at E/A = 290 MeV

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