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

Cheynis, B.; Chambon, B.; Drain, D.; Pastor, C.; Heuer, D.; Dauchy, A.; Giorni, A.; Morand, C.; Stassi, P.

doi:10.1007/bf01289350

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…The preequilibrium nucleons are emitted from a source moving with half the projectile velocity. The average number of preequilibrium nucleons is estimated according to the Blann model [26], and their momenta are assumed to follow a Boltzmann distribution of temperature 7 MeV [27]. For the reaction under study, the Blann model predicts the ejection of 22 preequilibrium nucleons.…”

Section: Event Selection and Pplf Reconstructionmentioning

confidence: 99%

Multidetector study of primary projectilelike fragments in the reactionCa40+
Lléres
¹
,
Giorni
²
,
Elhage
³

et al. 1993
Phys. Rev. C
Self Cite
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1
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Properties of projectile fragments produced in peripheral and midperipheral collisions in the reaction Ca + ""Cu at 35 MeV/nucleon were investigated using the AMPHORA multidetector. A reconstruction of the primary projectilelike fragments enabled simultaneous determination of their excitation energy and angular momentum. These quantities are in good agreement with predictions of simple macroscopic and microscopic collision models. Partition of excitation energy between primary projectile and targetlike fragments is discussed. The multiplicity and charge distributions of the primary projectilelike fragment deexcitation products are fairly well reproduced by a statistical binary-decay model. PACS number(s): 25.70.Pq, 25.70.Mn I. INTR(ODUCTIQN Current understanding of projectilelike fragment (PLF) production in peripheral and midperipheral heavy ioncollisions at intermediate energies has been obtained mainly from inclusive or semiexclusive measurements, which have been used to test parametrized models of the production mechanism of the excited primary projectilelike fragments (PPLF's) and their subsequent decay [1 -6]. At low incident energies (below 15 MeV/nucleon) conversion of entrance channel kinetic energy and angular momentum into thermal and rotational energies of the primary projectile and targetlike fragments are thought to be dominated by a one-body mechanism [7,8]. At higher incident energies the Pauli principle becomes less eftective in suppressing nucleon-nucleon collisions and schematic microscopic models based on nucleon-nucleon collisions [9,10] have been quite successful in explaining total reaction cross sections and fragment yields, as well as PLF energy and angular distributions.Primary projectilelike fragments with excitation energies up to 6 -7 MeV/nucleon can be produced in very inelastic reactions at incident energies of the order of [30][31][32][33][34][35]11]. It is interesting to understand how the decay mechanism of such nuclei is infiuenced by temperature and rotation. At low excitation energies, the emitted light particles and projectile residues are well described by statistical evaporation models [12,13] based on the multistep Hauser-Feshbach formalism [14]. For higher excitation energies, such a Permanent address: IFUNAM, A.P. 20-364, Mexico 01000 DF, Mexico. formalism becomes inadequate, since the emission of intermediate mass fragments may compete significantly with light-particle emission [11]. Sequential binary statistical decay models [15] based on the transition-state formalism [16] are used to describe the deexcitation of such highly excited nuclei. At very high excitation energies, the time scale for particle emission may become comparable with typical equilibration times [17], and simultaneous multifragmentation mechanisms have been proposed [18,19]. The use of a multidetector in the experimental investigation provides a qualitative advance in the sense that, for completely exclusive measurements, it is possible (in favorable kinematic configurations) to separate projectilel...

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Section: Event Selection and Pplf Reconstructionmentioning

confidence: 99%

Multidetector study of primary projectilelike fragments in the reactionCa40+
Lléres
¹
,
Giorni
²
,
Elhage
³

et al. 1993
Phys. Rev. C
Self Cite
22
0
10
1
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Light charged particles and clusters in coincidence with heavy fragments in the40Ar(1100 MeV)+13C incomplete fusion reaction. Simulated statistical decay analysis

Zahar¹,

Malki²,

Božin³

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Heavy-ion break-up processes in the Fermi energy range

Fuchs

Möhring

1994

Rep. Prog. Phys.

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The current knowledge on collisions between complex nuclei in the range 10-100 AMeV bombarding energy is reviewed in comparison with the essential features characterizing reactions below 10 AMeV and-partly-above 100 AMeV. The data are inspected for Recently, both models were used to explain the spectra of 6 electrons originating from heavy-ion reactions. Whereas the SFM (Frobrich and Stroth 1990) in its Langevin version is a universal function of the surface distance.

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

Cited by 3 publications

References 20 publications

Multidetector study of primary projectilelike fragments in the reactionCa40+
Lléres
¹
,
Giorni
²
,
Elhage
³

et al. 1993
Phys. Rev. C
Self Cite
22
0
10
1
View full text Add to dashboard Cite

Multidetector study of primary projectilelike fragments in the reactionCa40+
Lléres
¹
,
Giorni
²
,
Elhage
³

et al. 1993
Phys. Rev. C
Self Cite
22
0
10
1
View full text Add to dashboard Cite

Light charged particles and clusters in coincidence with heavy fragments in the40Ar(1100 MeV)+13C incomplete fusion reaction. Simulated statistical decay analysis

Heavy-ion break-up processes in the Fermi energy range

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

Cited by 3 publications

References 20 publications

Multidetector study of primary projectilelike fragments in the reactionCa40+Lléres1, Giorni2, Elhage3 et al. 1993Phys. Rev. CSelf Cite220101View full textAdd to dashboardCite

Multidetector study of primary projectilelike fragments in the reactionCa40+Lléres1, Giorni2, Elhage3 et al. 1993Phys. Rev. CSelf Cite220101View full textAdd to dashboardCite

Light charged particles and clusters in coincidence with heavy fragments in the40Ar(1100 MeV)+13C incomplete fusion reaction. Simulated statistical decay analysis

Heavy-ion break-up processes in the Fermi energy range

Contact Info

Product

Resources

About

Multidetector study of primary projectilelike fragments in the reactionCa40+
Lléres
¹
,
Giorni
²
,
Elhage
³

et al. 1993
Phys. Rev. C
Self Cite
22
0
10
1
View full text Add to dashboard Cite

Multidetector study of primary projectilelike fragments in the reactionCa40+
Lléres
¹
,
Giorni
²
,
Elhage
³

et al. 1993
Phys. Rev. C
Self Cite
22
0
10
1
View full text Add to dashboard Cite