Single-particle strengths measured with 48Ca(, p)49Ca reaction at 56 MeV

Uozumi, Yusuke; Iwamoto, Osamu; Widodo, Surip; Nohtomi, Akihiro; Sakae, Takeji; Matoba, M.; Nakano, Masahiro; Mäki, T.; Koori, N.

doi:10.1016/0375-9474(94)90740-4

Cited by 50 publications

(89 citation statements)

References 12 publications

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“…Finally, no strong neutron-resonances were identified below 158 keV. The two very small resonances at 20 keV and 107 keV only found in neutron capture [7], but not in β-delayed neutron decay [4,5] and not in the (d,p)-reaction [3,9], are probably also d-wave resonances with Γ n < Γ γ .…”

Section: Nuclear-structure Informationmentioning

confidence: 99%

“…At higher excitation energies many bound levels can be described by 2particle-1hole configurations [3]. Information on neutron-unbound states in 49 Ca (S n = 5.142 MeV) comes from three different experimental sources: neutron-capture and transmission measurements [2,[6][7][8], (d,p)-reaction work [3,9], and high-resolution spectroscopy of β-delayed neutron (βdn) decay [4,5] of J π = 3/2 + in 49 K. As is discussed in Ref. [12], the 49 K(β − ) 49 Ca(n) 48 Ca decay can be considered as inverse process to s-and d-wave neutron capture on 48 Ca.…”

Section: Nuclear-structure Informationmentioning

confidence: 99%

“…As an example we investigated the reaction 48 Ca(n,γ) 49 Ca to test our method, where, in principle, all necessary information is already available from various experiments [1][2][3][4][5][6][7][8][9]. We also calculated the reaction 50 Ca(n,γ) 51 Ca, which may be of importance in connection with an interpretation of the 50 Ti overabundance observed in FUN inclusions of the Allende meteorite (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Direct neutron capture for magic-shell nuclei

et al. 1996

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In neutron capture for magic-shell nuclei the direct reaction mechanism can be important and may even dominate. As an example we investigated the reaction 48 Ca(n,γ) 49 Ca for projectile energies below 250 keV in a direct capture model using the folding procedure for optical and bound state potentials. The obtained theoretical cross sections are in agreement with the experimental data showing the dominance of the direct reaction mechanism in this case. The above method was also used to calculate the cross section for 50 Ca(n,γ) 51 Ca.

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Section: Nuclear-structure Informationmentioning

confidence: 99%

Section: Nuclear-structure Informationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct neutron capture for magic-shell nuclei

et al. 1996

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“…However they are still necessary and allow for a depiction of nuclear structure [5,6]. The case of neutron stripping and pickup from 40,48 Ca can be considered as a typical example from which the nuclear structure community has built part of its representation of nuclear structure in terms of single-particle excitations and correlations [7][8][9]. From the early 90s, direct reactions have been widely used as a selective probe for the structure of unstable nuclei.…”

Section: Nuclear Structure From Direct Reactionsmentioning

confidence: 99%

Direct reactions with exotic nuclei

Obertelli

2014

EPJ Web of Conferences

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Abstract. Direct reactions have been a unique tool to address the nuclear many-body problem from the experimental side. They are now routinely used in inverse kinematics with radioactive ion beams (RIB). However, weakly bound nuclei have recently raised questions on the applicability of reaction formalisms benchmarked on stable nuclei to the study of single-particle properties and correlations in these unstable systems. The study of the most exotic species produced at low intensity have triggered new technical developments to increase the sensitivity of the setup, with a focused attention to direct reactions such as transfer at low incident energy or knockout at intermediate energies. Nuclear structure from direct reactionsIn nuclear reactions, some processes leave the final nucleus in a state that retains recollections of the initial wave function. These reactions, for which few degrees of freedom were modified, are called direct [1]. This gives to direct reactions, in addition to their selectivity, the strong advantage to allow a quantitative investigation of the ground-state properties of atomic nuclei.Different direct reaction mechanisms are used depending on the incident energy. Often encountered are nucleon transfer reactions at low incident energy, generally in a regime between 5 and 50 MeV/nucleon, and knockout reactions at relativistic energies, typically above 150 MeV/nucleon to minimize indirect contributions to the direct cross section. The electron-induced stripping reaction (e,e'p) is considered to be the reference stripping measurement from stable nuclei. As an electromagnetic probe, (e,e'p) is considered to be well understood when restricted to large momentum transfer. In this case, small corrections have to be taken into account for final state interaction with the proton in the exit channel [2]. Charge density and intrinsic momentum distributions of protons in stable nuclei have been well studied this way. The neutron component of nuclei requires a nuclear probe. Transfer and (p,2p) reactions have been benchmarked with (e,e'p) and found to be consistent for stable nuclei when treated as direct mechanisms and analyzed within a DWBA framework [3].Information extracted from the analysis of direct reaction cross sections has driven our understanding of the nuclear shell structure and their usefulness is unanimously recognized. The spectroscopic strength obtained from pickup and stripping reactions are indeed necessary to quantify the amount of correlations in a given nucleus and offer the possibility to address, when extracted from cross sections within a given theoretical framework, the question of uncorrelated single-particle energies E sp [4]

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“…We used the pairing strength G = 20 to reproduce a pairing gap of ∆ = 0.6 MeV for 49 Ca in our RAB calculations. We also compared results with SF = 1 and with SF extracted from (d,p) measurements [46]. The KD OMP clearly gives better agreement with measured σ γ than does the CH89 OMP.…”

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confidence: 92%