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Haravu, K.; Hollas, C.L.; Riley, P. J.; Coker, William R

doi:10.1103/physrevc.1.938

Cited by 26 publications

(26 citation statements)

References 6 publications

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“…The angular distributions measured here are generally consistent with the assignments of Ref. [20]. The majority of the observed transfer strength is = 2, with single = 4 and 5 transitions at excitation energies of 2.52 and 2.25 MeV.…”

Section: Reactions On 86 Krsupporting

confidence: 90%

“…Since only one target-array distance was used, the resulting angular coverage is rather restricted. However, assignments were taken from previous studies [20,21], where angular distributions over a greater range of angles were obtained, and the current results shown in Fig. 10 are used as a consistency check.…”

Section: Reactions On 86 Krmentioning

confidence: 99%

“…In addition, the (α, 3 He) reaction, preferable for high transfers to ensure good momentum matching, has only been performed on 92 Mo [18] and 90 Zr [19] and the resulting data are rather limited. Previous 2 H( 86 Kr,p) measurements have been performed using gas-cell targets at 5.5 MeV/u [20] and 7.5 MeV/u [21].…”

Section: Introductionmentioning

confidence: 99%

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Neutron single-particle strength outside theN=50core

et al. 2013

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The single-neutron properties of N = 51 nuclei have been studied with the (d,p) and (α, 3 He) reactions, at beam energies of 15 and 50 MeV respectively, on 88 Sr, 90 Zr, and 92 Mo targets. The light reaction products were momentum analyzed using a conventional magnetic spectrometer. Additionally, the 2 H(86 Kr,p) reaction was measured at a beam energy of 10 MeV/u, where outgoing light ions were analyzed using a helical-orbit spectrometer. Absolute cross sections and angular distributions corresponding to the population of different final states in the heavy product were obtained for each reaction. Spectroscopic factors were extracted and centroids of the single-particle strength were deduced. The observations appear consistent with calculations based on an evolution of single-particle structure driven by the nucleon-nucleon forces acting between valence protons and neutrons.

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Section: Reactions On 86 Krsupporting

confidence: 90%

Section: Reactions On 86 Krmentioning

confidence: 99%

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Neutron single-particle strength outside theN=50core

et al. 2013

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“…To test this method, in March 2014 we measured the 86 Kr(d, p) reaction at 35 MeV/u at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. When the analysis of these data is complete, results will be combined with earlier measurements of the 86 Kr(d, p) reaction at 5.5 MeV/u [10]. Reaction protons were measured at back angles in the laboratory with the Oak Ridge Rutgers University Barrel Array (ORRUBA) [11] of position-sensitive and the SIlicon Array (SIDAR) [12] of segmented silicon strip detectors.…”

Section: The Combined Methodsmentioning

confidence: 99%

Theoretical and Experimental Perspectives of Nuclear Reaction Studies with Radioactive Ion Beams

Cizewski¹,

Nunes²

2015

Acta Phys. Pol. B

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Nuclear reactions are one of the most powerful probes to study the properties of nuclei, in particular nuclei at the limits of stability. Reactions also play an important role in astrophysics and other applications. In order to extract useful information from reaction measurements, experiment goes hand-in-hand with reaction theory. While the last five decades have provided very good qualitative understanding of the processes, the challenge in the field of reaction theory is to have a grasp on the systematic uncertainties, such that predictions can be truly quantitative. Here, we provide some examples of ongoing efforts aimed at advancing the theory for (d, p) reactions and reducing the associated uncertainties. We present the status of using the 86 Kr(d, p) reaction and the combined method to control the uncertainties introduced by the overlap function. We also discuss the ambiguities of using only data to constrain the optical potential and will show recent results on the role of non-locality in transfer reactions.

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“…A robust prediction resulting from this mechanism should be the observation at lower and lower energies of states, having sizable ν1g 7/2 components, in the N = 51 isotones starting from stability towards 79 Ni. Considering now the neutron transfer data, for 87 Kr (populated from the lightest stable N = 50 target available) the main component with = 4 is found for the 7/2 + 2 state located near 2.52 MeV excitation energy [1,17] with a large spectroscopic factor S = 0.49 [17] [11]: the 7/2 + 1 located at 1115 keV was weakly populated in the reaction but the small observed cross section appeared to be compatible with = 4 associated with a large spectroscopic factor S = 0.77 ± 0.27. This would mean that the ν1g 7/2 single-particle energy undergoes a sudden and huge decrease of more than 1 MeV from 87 Kr to 85 Se.…”

Section: Introductionmentioning

confidence: 99%

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

Didierjean¹,

Verney²,

Duchêne³

et al. 2017

Phys. Rev. C

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Background: While the N = 50 shell-gap evolution towards 78 Ni is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the 78 Ni core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the ν1g 7/2 effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the 78 Ni region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2 + 1 states in 87 Kr and 85 Se are used to investigate the ν1g 7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones 85 Se and 87 Kr were populated via multinucleon transfer reactions, using a 82 Se beam and a 238 U target at the LNL tandem-ALPI facility. The prompt γ rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain τ (7/2 + 1 ) = 0.4 +1.6 −0.4 ps for 87 Kr. In the case of 85 Se an upper limit of 3(2) ps is obtained for the τ 7/2 + 1 value. Conclusion: For 87 Kr, the measured (7/2 + 1 ) lifetime is consistent with a core-coupled 2 + ⊗ ν2d 5/2 configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For 85 Se, the measured 7/2 + 1 lifetime limit indicates a very small contribution of the ν1g 7/2 configuration to the wave function of this state.

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Kr86(d, p)Kr

Cited by 26 publications

References 6 publications

Neutron single-particle strength outside theN=50core

Neutron single-particle strength outside theN=50core

Theoretical and Experimental Perspectives of Nuclear Reaction Studies with Radioactive Ion Beams

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

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