Measurements of interaction cross sections for light neutron-rich nuclei at relativistic energies and determination of effective matter radii

Ozawa, A.; Bochkarev, O.V.; Chulkov, L. V.; Cortina, D.; Geißel, H.; Hellström, M.; Ivanov, M.; Janik, R.; Kimura, K.; Kobayashi, T.; Korsheninnikov, A. A.; Münzenberg, G.; Nickel, F.; Ogawa, Yoko; Ogloblin, A. A.; Pfützner, M.; Pribora, V.; Simon, H.; Sitár, B.; Strmeň, P.; Sümmerer, K.; Suzuki, Toshio; Tanihata, I.; Winkler, M.; Yoshida, Kenichi

doi:10.1016/s0375-9474(01)00563-2

Cited by 264 publications

(180 citation statements)

References 46 publications

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“…As shown in Fig. 5(a) and referred to the data [46], the neutron root mean square radii from 14 C to 22 C are well reproduced by both RHFB and RHB calculations to certain quantitative precision. Evidently as shown in Fig.…”

Section: Resultssupporting

confidence: 61%

“…Before discussing the OES of neutron radii, it is worthwhile to check the quantitative precision for the theoretical description of the radius. In Table IV are shown the matter radii of neutron-rich Carbon isotopes obtained from the calculations of PKA1, PKO2, PKO3, PKDD, DD-ME2 and PK1, as compared to the experimental data [45,46]. It is found that both RHFB and RHB calculations with the selected effective Lagrangians provide appropriate agreement with the data, which to some extent demonstrates the theoretical reliability.…”

Section: Resultsmentioning

confidence: 76%

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Description of carbon isotopes within relativistic Hartree-Fock-Bogoliubov theory

Sun

Long

2013

Phys. Rev. C

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Within the relativistic Hartree-Fock-Bogoliubov (RHFB) theory, the structure properties of Carbon isotopes are systematically studied. To provide better overall description, the finite-range Gogny force D1S with an adjusted strength factor is adopted as the effective paring interaction in particle-particle channel. The selfconsistent RHFB calculations with density-dependent meson-nucleon couplings indicate the single-neutron halo structures in both 17 C and 19 C, whereas the two-neutron halo in 22 C is not well supported. It is also found that close to the neutron drip line there exists distinct odd-even staggering on neutron radii, which is tightly related with the blocking effects and correspondingly the blocking effect plays a significant role in the single-neutron halo formation.

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 76%

Description of carbon isotopes within relativistic Hartree-Fock-Bogoliubov theory

Sun

Long

2013

Phys. Rev. C

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“…with root mean squared (rms) matter radii of 2.36 for 9 Be and 2.90 fm for 26 Ne [30]. Extensive calculations for onenucleon knockout have shown the detailed radial form of the density to be unimportant, e.g., [16].…”

Section: Application To Two-proton Knockout From 28 Mgmentioning

confidence: 99%

Correlated two-nucleon stripping reactions

et al. 2004

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The cross sections for the stripping of two correlated nucleons from light and medium-mass nuclei are considered. Such reactions are of interest both as a means for populating and identifying low-lying excited states of very exotic nuclear species and as a potential direct spectroscopic probe of two-nucleon correlations in such systems. A calculation scheme that combines the full shell model two-nucleon spectroscopic amplitudes with eikonal reaction theory is presented. The theoretical predictions of the method, and of more approximate schemes, are compared with new data on two-proton removal from 28 Mg. The combined full shell model structure amplitudes and reaction dynamics predictions are in good agreement with the available measurements. First indications of the sensitivity of the reaction mechanism to the spatial and angular momentum structure of the stripped two-nucleon wave functions are also discussed and clarified.

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“…A Gaussian nucleon-nucleon (NN) effective interaction was assumed [25] with a range of 0.5 fm and a strength determined, in the usual way, by the free pp and np cross sections and the real-to-imaginary ratios of the forward NN scattering amplitudes [26]. The 9 Be density was of Gaussian form with a rms matter radius of 2.36 fm [27]. The density of 52 Ca was taken from a spherical Skyrme (SkX) Hartree-Fock (HF) calculation [28], with a rms matter radius of 3.632 fm.…”

Section: Fig 1: Longitudinal Momentum Distribution Of Thementioning

confidence: 99%

Cross-shell excitation in two-proton knockout: Structure ofCa52

et al. 2006

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The two-proton knockout reaction 9 Be( 54 Ti, 52 Ca+γ) has been studied at 72 MeV/nucleon. Besides the strong feeding of the 52 Ca ground state, the only other sizeable cross section proceeds to a 3 − level at 3.9 MeV. There is no measurable direct yield to the first excited 2 + state at 2.6 MeV. The results illustrate the potential of such direct reactions for exploring cross-shell proton excitations in neutron-rich nuclei and confirms the doubly-magic nature of 52 Ca.For decades, the cornerstone of nuclear structure has been the concept of single-particle motion in a welldefined potential leading to shell structure and magic numbers governed by the strength of the mean-field spin-orbit interaction [1]. Recent observations in exotic, neutron-rich nuclei have demonstrated that the sequence and energy spacing of single-particle orbits is not as immutable as once thought: some of the familiar magic numbers disappear and new shell gaps develop [2]. Crossshell excitations, arising from the promotion of nucleons across shell gaps, probe changes in shell structure. They are, however, not always readily identifiable in nuclear spectra. This letter demonstrates that two-proton knockout reactions can examine, selectively, cross-shell proton excitations in neutron-rich systems.Single-nucleon knockout reactions with fast radioactive beams are established tools to investigate the properties of halo nuclei [3] and to study beyond meanfield correlations, indicated by the quenching of spectroscopic strengths [4]. Eikonal theory [5] provides a suitable framework for the extraction of quantitative nuclear structure information from such reactions. In contrast, the potential of two-nucleon knockout as a spectroscopic tool has been recognized only recently. Bazin et al. [6] have shown that two-proton removal reactions from beams of neutron-rich species at intermediate energies proceed as direct reactions and that partial cross sections to different final states of the residue provide structure information. More recently, such a reaction was used to infer the magicity of the very neutron-rich 42 Si nucleus [7].In the current experiment, sizable cross sections for the 9 Be( 54 Ti, 52 Ca+γ)X reaction were found to feed only the 52 Ca ground state and a 3 − level with an excitation energy near 4 MeV, bypassing completely the first 2 + level at 2.6 MeV. These observations can be reproduced qualitatively by calculations which assign the 3 − level to the promotion of protons across the Z = 20 shell gap. In addition, the data confirm the presence of a neutron sub-shell closure at N = 32, the subject of much recent attention [8,9,10,11,12,13].The 54 Ti secondary ions were produced by fragmentation of a 130 MeV/nucleon 76 Ge beam, delivered by the Coupled Cyclotron Facility of the National Superconducting Cyclotron Laboratory, onto a 9 Be fragmentation target. The ions were selected in the A1900 largeacceptance fragment separator [14], which was operated with two settings during different phases of the experiment; 1% momentum acceptance and...

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Measurements of interaction cross sections for light neutron-rich nuclei at relativistic energies and determination of effective matter radii

Cited by 264 publications

References 46 publications

Description of carbon isotopes within relativistic Hartree-Fock-Bogoliubov theory

Description of carbon isotopes within relativistic Hartree-Fock-Bogoliubov theory

Correlated two-nucleon stripping reactions

Cross-shell excitation in two-proton knockout: Structure ofCa52

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