New information on the β-decay of 11Li from Doppler broadened γ lines

Fynbo, H. O. U.; Borge, María José García; Cederkäll, J.; Courtin, S.; Dessagne, Ph.; Jonson, B.; Scornet, G. Le; Nilsson, T.; Nyman, G.; Poirier, Éric; Riisager, K.; Tengblad, O.; Wilhelmsen, Katarina

doi:10.1016/j.nuclphysa.2004.02.020

Cited by 33 publications

(23 citation statements)

References 39 publications

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“…Also shown are the associated experimental relative branching ratios. The 3.96-and 5.24-MeV states are both populated in the β decay of 11 Li [21][22][23][24][25][26][27] and have been assigned spins of 3/2 − and 5/2 − , respectively [27]. Neither state is populated in one-neutron transfer reactions, whereas they are both populated in two-neutron transfer reactions [17,18].…”

Section: Discussion Of 11 Be Statesmentioning

confidence: 99%

“…+ n configuration. It is not populated by the β decay of 11 Li [21][22][23][24][25][26][27] and is therefore either a positive-parity state or a negative-parity state with a spin greater than 5/2. It strongly favors the decay to the 2 + 1 state of 10 Be over the decay to the ground state.…”

Section: Discussion Of 11 Be Statesmentioning

confidence: 99%

“…[19] it was interpreted as being the 7/2 − member of a molecular rotational band built on the 3.96-MeV [3/2 − ] state. The spin is unknown, but it is not populated in the β decay of 11 Li [21][22][23][24][25][26][27] and is therefore either a positive-parity state or a negative-parity state with a spin greater than 5/2. The state is observed to neutron decay to the 2 + 1 first excited state and to a state (or states) of 10 Be at ∼6 MeV.…”

Section: Discussion Of 11 Be Statesmentioning

confidence: 99%

“…The levels and decay scheme of 11 Be have previously been studied through measurements of the β-delayed neutron emission of 11 Li [21][22][23][24][25][26][27]. Where available, the branching ratios are compared with these measurements.…”

Section: Introductionmentioning

confidence: 99%

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Neutron decay widths of excited states ofBe11

et al. 2009

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The two-neutron transfer reaction 9 Be( 16 O, 14 O) 11 Be[ 10 Be + n] has been used to measure the branching ratios for the neutron decay of excited states of 11 Be. The 14 O ejectile was detected by a Q3D spectrometer at forward angles. The energies and angles of the 10 Be fragments of the decaying 11 Be * recoil were measured in coincidence with the 14 O ejectile using a double-sided silicon strip detector array at backward angles. This enabled a kinematic reconstruction of the reaction to be performed. Theoretical decay branch ratios were calculated using barrier penetrability factors and were compared to the measured ratios to provide information on the relative reduced widths of the states. The decay widths have been used to link states in 11 Be with a common structure and structurally to states in the daughter nucleus 10 Be. The 3/2 − 8.82-MeV state was identified as a candidate for a molecular band head.

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Section: Discussion Of 11 Be Statesmentioning

confidence: 99%

Section: Discussion Of 11 Be Statesmentioning

confidence: 99%

Section: Discussion Of 11 Be Statesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron decay widths of excited states ofBe11

et al. 2009

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“…The states of interest have short lifetimes, a few to hundreds of fs, so Coulomb excitation and the Doppler Shift Attenuation Method (DSAM) are the appropriate general experimental techniques. The study of 10 Be following β-delayed neutron decay of 11 Li has recently been shown to also be very powerful for this specific case [12,13]. We have concentrated on inferring lifetimes using DSAM, while focusing on the reduction of systematic uncertainties associated with the method.…”

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Precise Electromagnetic Tests ofAb InitioCalculations of Light Nuclei: States inBe10

et al. 2009

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In order to test ab-initio calculations of light nuclei, we have remeasured lifetimes in 10 Be using the Doppler Shift Attenuation Method (DSAM) following the 7 Li( 7 Li,α) 10 Be reaction at 8 and 10 MeV. The new experiments significantly reduce systematic uncertainties in the DSAM technique. The J π = 2 + 1 state at 3.37 MeV has τ = 205±(5)stat±(7)sys fs corresponding to a B(E2↓) of 9.2(3) e 2 fm 4 in broad agreement with many calculations. The J π = 2 + 2 state at 5.96 MeV was found to have a B(E2↓) of 0.11(2) e 2 fm 4 and provides a more discriminating test of nuclear models. New Green's Function Monte Carlo (GFMC) calculations for these states and transitions with a number of Hamiltonians are also reported and compared to experiment.Several ab-initio approaches, i.e., theoretical methods that start from "bare" nucleon-nucleon (NN ) potentials (that reproduce elastic NN scattering data) and empirical three-nucleon (3N ) potentials, are being developed for nuclear physics. Green's Function Monte Carlo (GFMC) [1,2] and the no-core shell model (NCSM) [3,4] are two methods that are used most to study p-shell nuclei. They have been successful in reproducing many features, including absolute binding energies and excitation spectra [5], charge radii [6,7], and electromagnetic moments [8]. These methods are being developed as successors to the original nuclear shell model [9,10] and have provided new insight into the origin of the spinorbit force, decoupling of poorly bound neutrons, and clustering of nucleons in light nuclei. Several aspects of the 3N force are not yet well constrained, particularly the isospin dependence. This is important for the equation of state of neutron matter and the properties of neutron stars. Thus, testing these approaches by studying some of the lightest nuclei can provide insights into some of the largest extended nuclear objects in the cosmos.The A = 10 nuclei 10 Be, 10 B, and 10 C have long provided a stringent test of nuclear models. Kurath [10] discussed the need for an unusually strong spin-orbit interaction to correctly reproduce the sequence of levels in 10 B. In these nuclei, the p-shell is half-filled and more than one state can be created with the same spin-parity J π , isospin T , and spatial symmetry. For example, 10 Be has two J π =2 + , T =1 states at 3.37 and 5.96 MeV with dominant wave-function components 1 D 2 [442]. These states have very different properties and provide a delicate test of both the Hamiltonians and the calculational methods. The Argonne v 18 (AV18) NN [11] interaction predicts a separation of only 0.23(15) MeV for these states, one with a negative (oblate) intrinsic quadrupole moment and a small B(E2) decay to the ground state, and one with a positive (prolate) quadrupole moment which is much more collective. The oblate state is lower in energy with just AV18. Calculations including 3N potentials tend to separate the states and bring the more collective prolate-deformed level lower in energy. The ratio of electromagnetic decays from these states to t...

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4-Beryllium

Sukhoruchkin

Soroko

Tables of Excitations From Reactions With Charged Particles. Part 1: Z = 3 - 36

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New information on the β-decay of 11Li from Doppler broadened γ lines

Cited by 33 publications

References 39 publications

Neutron decay widths of excited states ofBe11

Neutron decay widths of excited states ofBe11

Precise Electromagnetic Tests ofAb InitioCalculations of Light Nuclei: States inBe10

4-Beryllium

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