Spin alignment following inelastic scattering of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ne</mml:mi><mml:mprescripts /><mml:none /><mml:mn>17</mml:mn></mml:mmultiscripts></mml:math>
, lifetime of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">F</mml:mi><mml:mprescripts /><mml:none /><mml:mn>16</mml:mn></mml:mmultiscripts></mml:math>
, and its constraint on the continuum coupling strength

Charity, R. J.; Brown, K. W.; Okołowicz, J.; Płoszajczak, M.; Elson, J. M.; Reviol, W.; Sobotka, L. G.; Buhro, W. W.; Chajęcki, Z.; Lynch, W. G.; Manfredi, J.; Shane, R.; Showalter, R. H.; Tsang, M.B.; Weißhaar, D.; Winkelbauer, J.; Bedoor, S.; Wuosmaa, A. H.

doi:10.1103/physrevc.97.054318

Cited by 19 publications

(27 citation statements)

References 36 publications

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“…Coulomb final-state interaction between the two protons resulted in a depletion of events near θ pp =0 compared to θ pp =180 • . From fitting the magnitude of this effect, the intrinsic width of 16 F g.s could be extracted and was found to be consistent with the value obtained from directly measuring the width of the peak line shape [24]. Here, the decay width of the two possible intermediate states are larger (62 and 47 keV) than the value of 23 keV for the 16 F g.s.…”

Section: Distributions Of Relative Angle Between Protonssupporting

confidence: 77%

“…To describe spectra of 14 O resonances and their properties, we used the Shell Model Embedded in the Continuum (SMEC) which describes resonances in the framework of the shell model for open quantum systems [1,2,5,25,26]. Recent SMEC applications included the study of correlations and clustering in near-threshold states [1][2][3][4] and the change of the continuum coupling strength for like and unlike nucleons in exotic nuclei [24].…”

Section: Theoretical Resultsmentioning

confidence: 99%

“…However both protons are emitted with almost the same velocity so the second proton will not catch up to the first. To estimate the magnitude of these interactions, we have used the classical calculation described in [24]. The predicted θ pp distributions, assuming each proton is emitted isotropically is shown as the dashed black curve in Fig.…”

Section: Distributions Of Relative Angle Between Protonsmentioning

confidence: 99%

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Invariant-mass spectroscopy of O14 excited states

et al. 2019

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Excited states in 14 O have been investigated both experimentally and theoretically. Experimentally, these states were produced via neutron-knockout reactions with a fast 15 O beam and the invariant-mass technique was employed to isolate the 1p and 2p decay channels and determine their branching ratios. The spectrum of excited states was also calculated with the Shell Model Embedded in the Continuum that treats bound and scattering states in a unified model. By comparing energies, widths and decay branching patterns, spin and parity assignments for all experimentally observed levels below 8 MeV are made. This includes the location of the second 2 + state that we find is in near degeneracy with the third 0 + state. An interesting case of sequential 2p decay through a pair of degenerate 13 N excited states with opposite parities was found where the interference between the two sequential decay pathways produces an unusual relative-angle distribution between the emitted protons.

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Section: Distributions Of Relative Angle Between Protonssupporting

confidence: 77%

Section: Theoretical Resultsmentioning

confidence: 99%

Section: Distributions Of Relative Angle Between Protonsmentioning

confidence: 99%

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Invariant-mass spectroscopy of O14 excited states

et al. 2019

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“…Previous studies of inelastic scattering with fast beams have shown the possibility of achieving strong spin alignment if the target nucleus remains in its ground state after the inelastic scattering [1][2][3][4]. Figure 3 shows the distributions of target excitation energy deduced from the center of mass of the p+ 12 N and 2p+ 11 C events assuming two-body kinematics for inelastic scattering reactions.…”

Section: B Decay Angular Distributionsmentioning

confidence: 99%

Using spin alignment of inelastically-excited fast beams to make spin assignments: the spectroscopy of 13O as a test case

Charity,

Webb,

Elson

et al. 2021

Preprint

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Excited states in 13 O were investigated using inelastic scattering of an E/A=69.5-MeV 13 O beam off of a 9 Be target. The excited states were identified in the invariant-mass spectra of the decay products. Both single proton and sequential two-proton decays of the excited states were examined. For a number of the excited states, the protons were emitted with strong anisotropy where emissions transverse to the beam axis are favored. The measured proton-decay angular distributions were compared to predictions from distorted-wave born-approximation (DWBA) calculations of the spin alignment which was shown to be largely independent of the excitation mechanism. The deduced 13 O level scheme is compared to ab initio no-core shell model with continuum (NCSMC) predictions. The lowest-energy excited states decay isotropically consistent with predictions of strong proton 1s 1/2 structure. Above these states in the level scheme, we observed a number of higher-spin states not predicted within the model. Possibly these are associated with rotational bands built on deformed cluster configurations predicted by antisymmetrized molecular dynamics (AMD) calculations. The spin alignment mechanism is shown to be useful for making spin assignments and may have widespread use.

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“…The value of V 0 was constrained by the measured proton width of the 1/2 + 3 state. The spin-exchange parameter α has a value α = 2 which is appropriate for nuclei in the vicinity of driplines [13][14][15].…”

mentioning

confidence: 99%

$β^-{\rm p}$ and $β^-α$ decay of the $^{11}$Be neutron halo ground state

Okołowicz,

Płoszajczak,

Nazarewicz

2021

Preprint

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Beta-delayed proton emission from the neutron halo ground state of 11 Be raised much attention due to the unusually high decay rate. It was argued that this may be due to the existence of a resonance just above the proton decay threshold. In this Letter, we use the lenses of real-energy continuum shell model to describe several observables including the Gamow-Teller rates for the β − -delayed α and proton decays, and argue that, within our model, the large β − p branching ratio cannot be reconciled with other data.

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Spin alignment following inelastic scattering of Ne17 , lifetime of F16 , and its constraint on the continuum coupling strength

Cited by 19 publications

References 36 publications

Invariant-mass spectroscopy of O14 excited states

Invariant-mass spectroscopy of O14 excited states

Using spin alignment of inelastically-excited fast beams to make spin assignments: the spectroscopy of 13O as a test case

$β^-{\rm p}$ and $β^-α$ decay of the $^{11}$Be neutron halo ground state

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