Dynamical core deformation effects on single-nucleon knockout reactions at fragmentation beam energies

Batham, P; Thompson, I. J.; Tostevin, J. A.

doi:10.1103/physrevc.71.064608

Cited by 12 publications

(35 citation statements)

References 21 publications

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“…The residue momentum distributions were found to be indicative of the orbital angular momentum content of the Nilsson state. Deformation effects on elastic breakup, of importance for weakly bound deformed-core systems, were also considered, in a weak-coupling model [29], assuming spherical single-particle states coupled to a deformed core. The calculated stripping cross sections were once again found to be weakly dependent on the assumed core deformation.…”

Section: Introductionmentioning

confidence: 99%

Projectile deformation effects on single-nucleon removal reactions

Simpson

Tostevin

2012

Phys. Rev. C

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We discuss intermediate-energy single-nucleon removal reactions from deformed projectile nuclei. The removed nucleon is assumed to originate from a given Nilsson model single-particle state and the inclusive cross sections, to all rotational states of the residual nucleus, are calculated. We investigate the sensitivity of both the stripping cross sections and their momentum distributions to the assumed size of the model space in the Nilsson model calculations and to the shape of the projectile and residue. We show that the cross sections for small deformations follow the decomposition of the Nilsson state in a spherical basis. In the case of large and prolate projectile deformations the removal cross sections from prolate-like Nilsson states, having large values for the asymptotic quantum number n z , are reduced. For oblate-like Nilsson states, with small n z , the removal cross sections are increased. Whatever the deformation, the residue momentum distributions are found to remain robustly characteristic of the orbital angular momentum decomposition of the initial state of the nucleon in the projectile.

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Section: Introductionmentioning

confidence: 99%

Projectile deformation effects on single-nucleon removal reactions

Simpson

Tostevin

2012

Phys. Rev. C

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“…Stripping is a very different process and cannot at present be described within XCDCC. Eikonal studies have shown that core excitation does not affect the stripping component [30]. For the purpose of comparison with the data, the eikonal model was used to produce the necessary stripping cross sections [33].…”

Section: Some Results With Xcdccmentioning

confidence: 99%

“…When the loosely bound projectile cannot be described as a single particle state, core excited components may well exist in the initial state of the projectile. Models that take into account core excitation during breakup processes [29,30] have either neglected interference between the various projectile components or made an eikonal approximation of the reaction. XCDCC incorporates in a consistent way, core excitation in the bound and scattering states of the projectile (fully coupled), as well as dynamical excitation of the core as it interacts with the target.…”

Section: Motivationmentioning

confidence: 99%

The effects of core excitation in the breakup of exotic nuclei

Summers¹,

Nunes²,

Thompson³

2007

Nuclear Physics A

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Breakup of exotic nuclei is discussed within the context of the recently developed XCDCC (eXtended Continuum Discretized Coupled Channel) model. The method is applied to the breakup of 11 Be into 10 Be+n + γ on a 9 Be target. Interference between the multi-configurations of the projectile is observed as well as dynamical excitation of the core through the interaction with the target. MotivationThe exciting era introduced by the new radioactive beam facilities worldwide has pushed nuclear reaction theory to its limits of applicability [1,2]. Although significant progress has been achieved over the last decade, it is clear that nuclear reaction models are still lagging behind given the detail and quality of some coincidence measurements now available [3][4][5][6].Breakup reactions are frequently measured to provide structure information of the projectile, some of which hold relevance to astrophysics. When considering breakup of loosely bound core+N systems, one can describe the reaction process within a three body model, where the continuum is discretized in some way [7]. The coordinates used in such a model are represented in Fig. 1. If couplings are to be taken into account to all orders, one needs to solve the Continuum Discretized Coupled Channel (CDCC) Equation [7].In the past decade, the CDCC method has been applied to a very large number of reactions measured with radioactive beams, to help in the extraction of the desired structure information. Applications to the breakup of 6 Li and 6 He include Refs. [8][9][10][11][12] and results compare well with the data. One-neutron halo nuclei such as 11 Be and 15 C have also been studied within CDCC [13][14][15] and in most cases a good description of the data is found. Different targets and energy regimes have been used to study the breakup of the proton halo 8 B most of which have been analysed under the CDCC model [16][17][18][19][20][21].A new technique to explore the low lying continuum states of dripline nuclei (or nuclei beyond the dripline) involves transfer to the continuum. For example, to study states in the unbound system of 10 Li, which bares important information for the behaviour of the Borromean halo nucleus 11 Li, the (d,p) reaction is used on 9 Li, in inverse kinematics [23]. The final state in this transfer process can also be described within CDCC and applications *

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“…Depending on β 2 , each shell occupation amplitude in Eqs. (18) and (19) changes and so do their wave functions, as displayed in Fig. 1 (see also Fig.…”

Section: B Nucleon Knockout From 31 Nementioning

confidence: 86%

“…This is expected because the p 3/2 state and the s 1/2 state [in Eqs. (18) and (19)] have different, less space confining, centrifugal barriers than the corresponding f 7/2 and d 3/2 states, respectively. Therefore, admixture with the p 3/2 state and the s 1/2 state will induce narrower momentum distributions due to a larger spatial extension of the wave functions.…”

Section: B Nucleon Knockout From 31 Nementioning

confidence: 99%

Neutron removal from the deformed halo nucleus Ne31

2017

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Experimental data on Coulomb breakup and neutron removal indicate that 31 Ne is one of the heaviest halo nuclei discovered so far. The possible ground state of 31 Ne is either 3/2 − coming from p-wave halo or 1/2 + from s-wave halo. In this work, we develop a treatable model to include deformed wave functions and a dynamical knockout formalism which includes the dependence on the nuclear orientation to study the neutron removal from 31 Ne projectiles at energies around E ≈ 200 MeV/nucleon. A detailed account of the effects of deformation on cross sections and longitudinal momentum distributions is made. Our numerical analysis indicates a preference for the 31 Ne ground state with spin parity 3/2 − .

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Dynamical core deformation effects on single-nucleon knockout reactions at fragmentation beam energies

Cited by 12 publications

References 21 publications

Projectile deformation effects on single-nucleon removal reactions

Projectile deformation effects on single-nucleon removal reactions

The effects of core excitation in the breakup of exotic nuclei

Neutron removal from the deformed halo nucleus Ne31

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