Exotic nuclei explored at in-flight separators

Nakamura, Takashi; Sakuraï, H.; Watanabe, H.

doi:10.1016/j.ppnp.2017.05.001

Cited by 103 publications

(86 citation statements)

References 386 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the other ones are quenching like N=20 in magnesium and neon [18,19], and N=28 in sulfur and silicon [20]. Also, a discussion with experimental techniques on magic numbers can be found in the paper by Nakamura et al [21]. In the same context, in Refs.…”

Section: Introductionmentioning

confidence: 99%

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Adri

Oulne

2020

Eur. Phys. J. Plus

View full text Add to dashboard Cite

In this paper, we investigate features of the ground state of some nuclei far from the stability for isotope chains with proton numbers Z=18 and 20. Our aim is to predict the eventual existence of magic numbers in these exotic nuclei. For this purpose, we use two methods: the non relativistic Hartree-Fock-Bogoliubov (HFB) approach based on SLy4 Skyrme functional and the relativistic (so-called covariant) density functional theory (CDFT) by using the DD-ME2 force parametrization. We compare our results with the available experimental data and with the predictions of other models such as Finite Range Droplet Model (FRDM). Our present investigation predicts that N=32 and N=40 are magic numbers for Ar and Ca isotopes.

show abstract

Section: Introductionmentioning

confidence: 99%

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Adri

Oulne

2020

Eur. Phys. J. Plus

View full text Add to dashboard Cite

show abstract

“…Far from stability, neutron separation energies decrease as beta-decay endpoint energies become large, increasing the likelihood of beta-delayed neutron emission. In these regions, neutron spectroscopy becomes essential to obtain important information about the nuclear structure of these nuclei [2,3,4]. The Neutron dEtector with Xn Tracking (NEXT) array has been developed time difference, T , between a START signal (associated with the initial emission of a neutron) and a STOP signal (detection of emitted neutron) over some fixed distance, L. In such a configuration, a simple calculation for the energy resolution, ∆E, as a function of detector limitations is given by the following expression [6]:…”

Section: Introductionmentioning

confidence: 99%

Conceptual design and first results for a neutron detector with interaction localization capabilities

Heideman

Pérez–Loureiro

Grzywacz

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

A new high-precision detector for studying neutrons from beta-delayed neutron emission and direct reaction studies is proposed. The Neutron dEtector with Xn Tracking (NEXT) array is designed to maintain high intrinsic neutron detection efficiency while reducing uncertainties in neutron energy measurements. A single NEXT module is composed of thin segments of plastic scintillator, each optically separated, capable of neutron-gamma discrimination. Each segmented module is coupled to position sensitive photodetectors enabling the high-precision determination of neutron time of arrival and interaction position within the active volume. A design study has been conducted based on simulations and experimental tests leading to the construction of prototype units. First results from measurements using a 252 Cf neutron source and accelerator-produced monoenergetic neutrons are presented.to observe beta-delayed neutron emitters with improved precision. These improvements will also be applicable to proton transfer reactions which probe discrete states of exotic nuclei.NEXT has also been designed to incorporate neutron-gamma (n-γ) discrimination to improve background rejection. Prevalent gamma-ray backgrounds common in decay and reaction measurements can be reduced significantly in neutron spectra, further improving neutron energy determinations [5]. Proof-of-principle tests for the NEXT design will be described along with results from the first neutron measurements. Detector DesignA neutron time-of-flight (ToF) detector determines neutron kinetic energies, E, by measuring the

show abstract

“…The availability of high-intensity radioactive ion beams (RIB) has made elastic and inelastic proton scattering from unstable nuclei available to study and the old theories of nuclear physics are now being tested in new settings, the limits of nuclear stability are being probed, and surprising results have been obtained thus far. Major surprises in low-energy nuclear structure include the disappearance of the normal shell closures observed near the stability valley, appearance of new magic numbers, exotic features of nuclear structure such as nuclear halos and skins, and new regions of deformation [1,2]. Structure and reaction studies of unstable nuclei will have great impact on astrophysics because they are known to play an important role in nucleosynthesis.…”

Section: Introductionmentioning

confidence: 99%

“…In direct kinematics the light particle (in our case, proton) is accelerated onto the stationary heavy target, while in inverse kinematics the heavy particle is accelerated, and the light particle (proton) serves as the target. Very good sensitivity and high resolution are required for experiments in inverse kinematics in order to detect rare events with high efficiency and to have the maximum information possible with low statistics [1,2]. It is sometimes experimentally difficult to detect the heavy fragment in inverse kinematics because of the short lifetime of unstable nuclei.…”

Section: Introductionmentioning

confidence: 99%

Calculation of a complete set of spin observables for proton elastic scattering from stable and unstable nuclei

et al. 2018

View full text Add to dashboard Cite

A microscopic study of proton elastic scattering from unstable nuclei at intermediate energies using a relativistic formalism is presented. We have employed both the original relativistic impulse approximation (IA1) and the generalised impulse approximation (IA2) formalisms to calculate the relativistic optical potentials, with target densities derived from relativistic mean field (RMF) theory using the NL3 and FSUGold parameter sets. Comparisons between the optical potentials computed using both IA1 and IA2 formalisms, and the different RMF Lagrangians are presented for both stable and unstable targets. The comparisons are required to study the effect of using IA1 versus IA2 optical potentials, with different RMF parameter sets, on elastic scattering observables for unstable targets at intermediate energies. We also study the effect of full-folding versus the factorized form of the optical potentials on elastic scattering observables. As with the case for stable nuclei, we found that the use of the full-folding optical potential improves the scattering observables (especially spin observables) at low intermediate energy (e.g. 200MeV). No discernible difference is found at a projectile incident energy of 500 MeV. To check the validity of using localized optical potential, we calculate the scattering observables using non-local potentials by solving the momentum space Dirac equation. The Dirac equation is transformed to two coupled Lippmann-Schwinger equations, which are then numerically solved to obtain elastic scattering observables. The results are discussed and compared to calculations involving local coordinate-space optical potentials.

show abstract

Exotic nuclei explored at in-flight separators

Cited by 103 publications

References 386 publications

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Conceptual design and first results for a neutron detector with interaction localization capabilities

Calculation of a complete set of spin observables for proton elastic scattering from stable and unstable nuclei

Contact Info

Product

Resources

About