Energy levels of light nuclei A = 11−12

Ajzenberg‐Selove, F.

doi:10.1016/0375-9474(90)90271-m

Cited by 817 publications

(520 citation statements)

References 1,001 publications

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“…The 2 + resonance with energy and width (E R , Γ R )=(0.822±25, 0.113±20) MeV [4] is well established corresponding to an excitation energy of around 1.8 MeV, as also confirmed in recent 6 He fragmentation reaction experiments [5,6]. Different theoretical calculations reproduce the properties of this 2 + state [7,8], although they differ in the predicted levels at higher excitation energies.…”

Section: Introductionsupporting

confidence: 58%

Dipole excited states in 11Li with complex scaling

Garrido¹,

Fedorov²,

Jensen³

2002

Nuclear Physics A

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The 1 − excitations of the three-body halo nucleus 11 Li are investigated. We use adiabatic hyperspherical expansion and solve the Faddeev equations in coordinate space. The method of complex scaling is used to compute the resonance states. The Pauli forbidden states occupied by core neutrons are excluded by constructing corresponding complex scaled phase equivalent two-body potentials. We use a recently derived neutron-core interaction consistent with known structure and reaction properties of 10 Li and 11 Li. The computed dipole excited states with J π = 1/2 + , J π = 3/2 + , and J π = 5/2 + have energies ranging from 0.6 MeV to 1.0 MeV and widths between 0.15 MeV and 0.65 MeV. We investigate the dependence of the complex energies of these states on the 10 Li spectrum. The finite spin 3/2 of the core and the resulting core-neutron spin-spin interaction are important. The connection with Coulomb dissociation experiments is discussed and a need for better measurements is pointed out. : 21.45.+v, 25.10.+s, 25.60.Gc PACS

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Section: Introductionsupporting

confidence: 58%

Dipole excited states in 11Li with complex scaling

Garrido¹,

Fedorov²,

Jensen³

2002

Nuclear Physics A

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“…These data show a resonance at a decay energy of 80 (2) keV indicating population of the known 3/2 − state at 3.949(2) MeV in 11 Be decaying to the first 2 + state in 10 Be via neutron emission. The uncertainty of the measured energy for this state is significantly improved over the previous accepted value [4]. The measured knock-out cross section of 15(3) mb implies a spectroscopic factor near unity for this 3/2 − state.…”

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confidence: 61%

“…By adding the measured value of the first excited 2 + state in 10 Be at 3.36803(3) MeV [24] and the recently improved neutron separation energy of 501.3(6) keV [11], this neutron decay energy corresponds to an excitation energy of 3.949(2) MeV in 11 Be, and improves the uncertainty of the currently adopted energy of this state (the second 3/2 − state at 3.956(15) MeV in Ref. [4]. The present value is below the value measured by Hirayama et al for this state, 3.969 +0.020 −0.009 MeV, from 11 Li beta decay [1].…”

mentioning

confidence: 77%

“…2 with a cross section of 15(3) mb. Systematic uncertainties, due to various beam parameters that fit the measured distributions recorded in the charged-particle detectors, accounts for the limited resolution of fitting the decay width leading to an upper limit of 40 keV that is consistent with the accepted value of 15 keV [4]. The uncertainty of the centroid of the peak is much less affected and a χ 2 analysis yields a 2 keV standard deviation for the uncertainty of the 80 keV value.…”

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confidence: 82%

“…2, the resonant energies of 11 Be*(1.778 MeV) (dot-dashed line) and 11 Be*(2.690 MeV) (dashed line) and their widths (100 keV and 200 keV) were kept constant at the values reported in Ref. [4] along with the proportional intensities of the two as reported by Pain et al in Ref. [2].…”

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confidence: 99%

See 2 more Smart Citations

Neutron knockout ofBe12populating neutron-unbound states inBe11
Peters
¹
,
Baumann
²
,
Brown
³

et al. 2011
Phys. Rev. C
15
2
19
2
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Nuclear Reaction Analysis and Proton‐Induced Gamma Ray Emission

Vizkelethy

2002

Characterization of Materials

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Nuclear reaction analysis (NRA) and proton‐ (particle‐) induced gamma ray emission (PIGE) are based on the interaction of energetic (from a few hundred kilo‐electron‐volt to several mega‐electron‐volt) ions with light nuclei. Every nuclear analytical technique that uses nuclear reactions has a unique feature—isotope sensitivity. Therefore, it is insensitive to matrix effects, and there is much less interference than in methods where signals from different elements overlap. In NRA the nuclear reaction produces charged particles, while in PIGE the excited nucleus emits gamma rays. Sometimes the charged particle emission and the gamma ray emission occur simultaneously. Both NRA and PIGE measure the concentration and depth distribution of elements in the surface layer (few micrometers) of the sample. Both techniques are limited by the available nuclear reactions. Generally, they can be used for only light elements, up to calcium. This is the basis for an important property of these methods: the nuclear reaction technique is one of the few analytical techniques that can quantitatively measure hydrogen profiles in solids. Since these techniques are sensitive to the nuclei in the sample, they are unable to provide information about the chemical states and bonds of the elements in the sample. For the same reason they cannot provide information about the microscopic structure of the sample. Combined with channeling, NRA or PIGE can provide information about the location of the measured element in a crystalline lattice. The sensitivity and depth resolution of these methods depend on the specific nuclear reaction. Although NRA and PIGE are quantitative, in most cases standards have to be used. These techniques require a particle accelerator capable of accelerating ions up to several mega‐electron‐volts. This limits their availability to laboratories dedicated to these methods or that have engaged in low‐energy nuclear physics in the past (i.e., they have a particle accelerator that is no longer adequate for modern nuclear physics experiments because of its low energy but is quite suitable for nuclear analytical techniques). This article concentrates on the specific aspects of these two nuclear analytical techniques.

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Energy levels of light nuclei A = 11−12

Cited by 817 publications

References 1,001 publications

Dipole excited states in 11Li with complex scaling

Dipole excited states in 11Li with complex scaling

Neutron knockout ofBe12populating neutron-unbound states inBe11
Peters
¹
,
Baumann
²
,
Brown
³

et al. 2011
Phys. Rev. C
15
2
19
2
View full text Add to dashboard Cite

Nuclear Reaction Analysis and Proton‐Induced Gamma Ray Emission

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Energy levels of light nuclei A = 11−12

Cited by 817 publications

References 1,001 publications

Dipole excited states in 11Li with complex scaling

Dipole excited states in 11Li with complex scaling

Neutron knockout ofBe12populating neutron-unbound states inBe11Peters1, Baumann2, Brown3 et al. 2011Phys. Rev. C152192View full textAdd to dashboardCite

Nuclear Reaction Analysis and Proton‐Induced Gamma Ray Emission

Contact Info

Product

Resources

About

Neutron knockout ofBe12populating neutron-unbound states inBe11
Peters
¹
,
Baumann
²
,
Brown
³

et al. 2011
Phys. Rev. C
15
2
19
2
View full text Add to dashboard Cite