Dissociation reactions of the 11Be one-neutron halo. The interplay between structure and reaction mechanism

Anne, R.; Arnell, S.E.; Bimbot, R.; Dogny, S.; Emling, H.; Esbensen, H.; Guillemaud‐Mueller, D.; Hansen, P. G.; Hornshøj, P.; Humbert, F.; Jonson, B.; Keim, M.; Lewitowicz, M.; Møller, P.; Mueller, A. C.; Neugart, R.; Nilsson, T.; Nyman, G.; Pougheon, F.; Riisager, K.; Saint‐Laurent, M. G.; Schrieder, G.; Sorlin, O.; Tengblad, O.; Rolander, K. Wilhelmsen; Wolski, D.

doi:10.1016/0370-2693(93)91399-8

Cited by 56 publications

(12 citation statements)

References 20 publications

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“…At low energies diffraction and neutronstripping are of the same magnitude for all A. This agrees with other calculations [13,14] which find also that both processes are almost the same up to energies of 100 MeV/n.…”

Section: Integrated Cross Sectionssupporting

confidence: 91%

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Breakup reactions of the halo nucleiBe11andB
Hencken
¹
,
Bertsch
²
,
Esbensen
³

1996
Phys. Rev. C
186
10
250
1
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We calculate the nuclear induced breakup of 11 Be and 8 B using a more realistic treatment of the diffraction and stripping processes than in previous work. The breakup is treated in the eikonal approximation with a profile function calculated from a realistic optical potential at low energies and from free nucleon-nucleon cross sections at high energies. This treatment gives a good description of measured breakup cross sections, as well as the longitudinal momentum distribution of the core-like fragments, which is narrower than predicted in the transparent limit. The real part of the potential is found to be significant and enhances the diffractive breakup at low energies.25.60. Gc,25.70.Mn

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Section: Integrated Cross Sectionssupporting

confidence: 91%

“…As already discussed with Fig. 1, the cross sections for diffraction and neutron-stripping are almost the same at energies below 100 MeV/n in agreement with other calculations [13,14].…”

Section: Integrated Cross Sectionssupporting

confidence: 91%

Breakup reactions of the halo nucleiBe11andB
Hencken
¹
,
Bertsch
²
,
Esbensen
³

1996
Phys. Rev. C
186
10
250
1
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“…would play a very important role in intermediate energies (2 10). Such large break-up cross sections were observed for high-Z targets at GANIL for 8He, IILi, lIBe, and 1 4Be (223)(224)(225) . The process is also reported by Kobayashi et al for 800 MeVlu beams of SHe, "Li, 14Be made at Berkeley (226) , but at the relativistic energies only 15-30% of the total reaction cross section is electrical.…”

Section: Sections Momentum Distributions and Neutron Correlationsmentioning

confidence: 64%

Nuclei at the Limits of Particle Stability

Mueller¹,

Sherrill

1993

Annu. Rev. Nucl. Part. Sci.

139

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between the protons in the nucleus. The details of the nuclear landscape are highly influenced by the fact that the n-p interaction is slightly stronger than either the n-n or p-p reaction. Excluding consideration of the Coulomb force, nuclei with equal numbers of neutrons and pro tons are more stable since the numberof n-p interactions is maximized. Furthermore, since the n-n system is slightly unbound, infinite, or even very large: , collections of neutrons and a few protons are not stable (except p(!rhaps in neutron starts, stabilized by gravity).The extent of stable nuclei found in nature illustrates the character istics of the nuclear stability. The stable nuclei (found naturally) are represented by dark squares in Figure I, the chart of nuclides. For nuclei greater than A = 40, the Coulomb force has shifted the line of stability away from N = Z toward neutron-rich nuclei . The Coulomb force also limits the extent of the heaviest elements since the short range of the nuclear force does not provide sufficient binding in large

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“…The breakup reactions of 11 Be on targets from light to heavy mass have been studied by R. Anne et al [30]. The authors used mainly the inclusive neutron angular distributions.…”

Section: Introductionmentioning

confidence: 99%

Coulomb and nuclear breakup of a halo nucleus Be11

et al. 2004

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Breakup reactions of the one-neutron halo nucleus 11 Be on lead and carbon targets at about 70 MeV/nucleon have been investigated at RIKEN by measuring the momentum vectors of the incident 11 Be, outgoing 10 Be, and neutron in coincidence. The relative energy spectra as well as the angular distributions of the 10 Be+n center of mass system (inelastic angular distributions) have been extracted both for Pb and C targets. For the breakup of 11 Be on Pb, the selection of forward scattering angles, corresponding to large impact parameters, is found to be effective to extract almost purely the first-order E1 Coulomb breakup component, and to exclude the nuclear contribution and higher-order Coulomb breakup components. This angle-selected energy spectrum is thus used to deduce the spectroscopic factor for the 10 Be(0 + ) ⊗ ν2s 1/2 configuration in 11 Be which is found to be 0.72 ± 0.04 with a B(E1) strength up to Ex = 4 MeV of 1.05 ± 0.06 e 2 fm 2 . The energy weighted E1 strength up to Ex = 4 MeV explains 70 ± 10 % of the cluster sum rule, consistent with the obtained spectroscopic factor. The non-energy weighted sum rule within the same energy range is used to extract the root mean square distance of the halo neutron to be 5.77( 16) fm, consistent with previously known values. In the breakup with the carbon target, we have observed the excitations to the known unbound states in 11 Be at Ex = 1.78 MeV and Ex = 3.41 MeV. Angular distributions for these states show the diffraction pattern characteristic of L=2 transitions, resulting in J π =(3/2,5/2) + assignment for these states. We finally find that even for the C target the E1 Coulomb direct breakup mechanism becomes dominant at very forward angles.

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Dissociation reactions of the 11Be one-neutron halo. The interplay between structure and reaction mechanism

Cited by 56 publications

References 20 publications

Breakup reactions of the halo nucleiBe11andB
Hencken
¹
,
Bertsch
²
,
Esbensen
³

1996
Phys. Rev. C
186
10
250
1
View full text Add to dashboard Cite

Breakup reactions of the halo nucleiBe11andB
Hencken
¹
,
Bertsch
²
,
Esbensen
³

1996
Phys. Rev. C
186
10
250
1
View full text Add to dashboard Cite

Nuclei at the Limits of Particle Stability

Coulomb and nuclear breakup of a halo nucleus Be11

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Dissociation reactions of the 11Be one-neutron halo. The interplay between structure and reaction mechanism

Cited by 56 publications

References 20 publications

Breakup reactions of the halo nucleiBe11andBHencken1, Bertsch2, Esbensen3 1996Phys. Rev. C186102501View full textAdd to dashboardCite

Breakup reactions of the halo nucleiBe11andBHencken1, Bertsch2, Esbensen3 1996Phys. Rev. C186102501View full textAdd to dashboardCite

Nuclei at the Limits of Particle Stability

Coulomb and nuclear breakup of a halo nucleus Be11

Contact Info

Product

Resources

About

Breakup reactions of the halo nucleiBe11andB
Hencken
¹
,
Bertsch
²
,
Esbensen
³

1996
Phys. Rev. C
186
10
250
1
View full text Add to dashboard Cite

Breakup reactions of the halo nucleiBe11andB
Hencken
¹
,
Bertsch
²
,
Esbensen
³

1996
Phys. Rev. C
186
10
250
1
View full text Add to dashboard Cite