Method for the study of neutron emission from light fragments in intermediate energy heavy-ion collisions

Deák, F.; Kiss, Á.; Seres, Z.; Caskey, G.; Galonsky, A.; Remington, B. A.

doi:10.1016/0168-9002(87)90080-5

Cited by 29 publications

(3 citation statements)

References 6 publications

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“…This method involves the collinear detection of the neutron and the resulting fragment. It was first applied to study unbound excited states of nuclei closer to the drip line in dissipative heavy-ion collisions, where the detectors were located at angles larger than 7 • [46]. In 1993 Kryger et al deduced the unbound states of 7 He and 10 Li from the relative velocity of the neutron and the fragment following fragmentation of an 80 MeV/nucleon 18 O beam [47].…”

Section: History Of Neutron-unbound Nucleimentioning

confidence: 99%

“…In early experiments that investigated neutron-unbound states, charged particle telescopes and neutron detectors were placed in a collinear arrangement at large angles to the beam axis [46,104]. This experimental method has been called 'sequential neutron decay spectroscopy.'…”

Section: Separation Techniquesmentioning

confidence: 99%

“…With the angular acceptance of the neutron detector limited to 0 • , the experimental results can be displayed as a relative velocity spectrum that reveals a double-peak [46,47], caused by the neutron being emitted forward or backward with respect to the charged fragment. The relative velocity v rel is related to the decay energy E = 1 2 µv 2 rel (non-relativistic), where µ is the reduced mass of the neutron-fragment system [47].…”

Section: Separation Techniquesmentioning

confidence: 99%

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Nuclear structure experiments along the neutron drip line

2012

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Invariant mass measurements and breakup reactions of neutron-rich nuclei have been instrumental in the study of nuclear structure effects at the limit of nuclear existence. The measurements of neutron-unbound states rely on the detection of neutrons in coincidence with fragments at energies between 100 and 1000 MeV/u. Charged particle and γ-ray coincidence measurements yield additional information. The production and detection methods for these experiments and examples of results in light nuclei are presented. Future opportunities with new facilities and the development of new detectors are described.

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Section: History Of Neutron-unbound Nucleimentioning

confidence: 99%

Section: Separation Techniquesmentioning

confidence: 99%

Section: Separation Techniquesmentioning

confidence: 99%

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Nuclear structure experiments along the neutron drip line

2012

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Evidence for an absorption effect in neutron emission in the20Ne +58Ni reaction at 30 MeV per nucleon

Cheynis

Chambon

Drain

et al. 1990

Z. Physik A - Atomic Nuclei

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Neutron energy spectra were analysed at various angles in coincidence with projectile-like fragments in the reaction ZONe+ 58Ni at 30 MeV per nucleon. The data have been parametrized with a three moving source fit, taking into account the emission from discrete excited states of the coincident light fragments and the recoil effect due to the emission of neutrons by light nuclei. A nucleon-nucleon scattering description of the intermediate velocity source gives good fits to the data. However the necessity of introducing a reabsorption effect in the projectile-like and target-like nuclei for the nucleons from that source is demonstrated by testing the momentum and energy balances in the fitting procedure. The mean free path of nucleons in nuclear matter is determined. A good agreement is then obtained for the lowest momentum transfers where single scattering dominates. For the largest momentum transfer another mechanism such as double scattering or one-body friction must be introduced in order to reproduce the data.

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