Four-nucleon pickup reaction on 12 ⩽ A ⩽ 94 nuclei

Umeda, K.; Yamaya, T.; Suehiro, T.; Takimoto, K.; Wada, Ryoichi; Takada, E.; Shimoura, S.; Sakaguchi, A.; Murakami, S.; Fukada, M.; Okuma, Y.

doi:10.1016/0375-9474(84)90150-7

Cited by 43 publications

(32 citation statements)

References 41 publications

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“…This is in agreement with shell model calculations [4] but not with the measurement of Umeda et al [5]. The clusterization at the surface of 40 Ca seems to be very small.…”

Section: -Probing Alpha Clusterization In Nucleisupporting

confidence: 76%

“…In the first case (i) nuclear break-up should lead to the emission of the two neutrons together at large angle whereas in case (ii) one neutron will be towed and the second one be emitted in the direction of the beam as 5 He is not bound. The distribution of relative angle between the two emitted neutron should then give the information on the spatial correlation between the neutrons in the halo as illustrated by The break-up of 6 He on 208 Pb was studied at GANIL using the Neutron Wall and the EDEN neutron detectors coupled to an annular Silicon stripped detector.…”

Section: -Probing Pairing Correlations In Light Nucleimentioning

confidence: 99%

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Study of pairing and clusterisation in light nuclei through nuclear break-up

Assié

Scarpaci

Lacroix

2014

EPJ Web of Conferences

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Abstract. Nuclear break-up is a powerful tool to investigate nuclear structure as it is sensitive to the quantum properties of the emitted particles. This reaction mechanism has been used to investigate several aspects of correlations. First, the case of 11 Be was studied where the spectroscopic factors for the two configurations where extracted. Secondly, the spectroscopic factor for alpha clusterization in the ground state of 40 Ca was measured. Finally the correlation between the two neutrons in the halo of 6 He emitted through breakup reactions showed strong contribution for the di-neutron configuration. Nuclear break-upNuclear break-up occurs at few tens of MeV per nucleon. Among all other inelastic processes leading to the emission of one nucleon, the nuclear break-up, also called Towing Mode is characterized by the emission of a nucleon from the target on the same side as the projectile with an intermediate velocity and a large angle with respect to the beam axis. Knock-out reactions lead to a nucleon emitted around 90 deg. while pick-up break-up reactions lead to forward emission. The mechanism is understood the following way: when the projectile passes by the target, the nucleon inside the target feels its nuclear potential and is towed to be emitted to the continuum. This picture is confirmed by a theoretical model solving the time dependent Schrödinger equation (TDSE) for the wave function of a nucleon inside the potential of target when the projectile potential passes by.The nuclear break-up was brought out in the 40 Ar+ 58 Ni @ 44 MeV/A reaction where the neutron or proton knock-out was measured [1]. In addition to the statistical decay, a contribution was highlighted in the forward region. The angular distribution extracted for each excited state populated in the daughter nucleus showed very good agreement with the TDSE calculations (see Fig. 1). Therefore nuclear break-up is sensitive to the initial wave function (quantum numbers) of the nucleon inside the target and can be used as a tool to probe nuclear structure. Several other examples of the use of nuclear break-up will be shown below such as configuration mixing, pairing correlation and clusterization into alpha particles.

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“…This is in agreement with shell model calculations [4] but not with the measurement of Umeda et al [5]. The clusterization at the surface of 40 Ca seems to be very small.…”

Section: -Probing Alpha Clusterization In Nucleisupporting

confidence: 76%

Section: -Probing Pairing Correlations In Light Nucleimentioning

confidence: 99%

Study of pairing and clusterisation in light nuclei through nuclear break-up

Assié

Scarpaci

Lacroix

2014

EPJ Web of Conferences

View full text Add to dashboard Cite

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“…[8] but much lower than the transfer reaction 40 Ca(d, 6 Li) measurement from ref. [9]. The nuclear break-up of 40 Ar can be identified clearly in the spectra of parallel versus perpendicular momentum obtained in coincidence with 36 S in SPEG (see fig.3).…”

Section: Introductionmentioning

confidence: 85%

“…Very little is known about clusterisation in the ground state of nuclei. Nuclei which have a pronounced α-cluster structure in their ground states are for example 8 Be, 9 Be, 6 Li and 7 Li. 8 Be is formed out of two almost free α-particle, roughly 4 fm apart and barely touching one another.…”

Section: Introductionmentioning

confidence: 99%

Pairing and quartetting in medium mass nuclei

Assié

Crom

Lefebvre

et al. 2016

EPJ Web of Conferences

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Abstract. Pairing and quartetting are competing phenomena in nuclei. In the selfconjugate nuclei from the fp-shell, the competition between T=0 pairing (deuteron-like) and alpha clusterisation is predicted to be affected by the spin-orbit interaction. In order to probe the α structure of fp-shell nuclei, the nuclear break-up of 40 Ca and 40 Ar has been measured at GANIL. The α spectroscopic factors obtained for the N=Z nucleus and the N Z nuclei do not reflect any difference. This might be an indication that the tail of the wave function in not sensitive to nuclear asymmetry. Perspectives for probing the deuteron-like pairing (T=0) are given.

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confidence: 99%

Analysis of the normal optical, Michel and molecular potentials on the 40Ca(6Li, d)44 Ti reaction

Mazumder¹,

Somadder

Hoque

et al. 2016

Pramana - J Phys

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Full finite-range (FFR) distorted-wave Born approximation (DWBA) method has been applied to analyse the angular distributions of cross-sections of the 40 Ca( 6 Li, d) 44 Ti reaction at 28 MeV incident energy for the 22 transitions involving both the bound and unbound states of 44 Ti by using the normal optical, Michel and molecular potentials. The extracted spectroscopic factors for the three optical potentials are compared with those of some previous studies of zero-range (ZR) calculations of the 40 Ca( 6 Li, d) 44 Ti reaction using the normal optical potential. The χ 2 values of all the levels are obtained for the three optical potentials to estimate the quality of the fits. Molecular and Michel potentials have been used for the first time to analyse the four-nucleon transfer reaction and it seems that the molecular potential fits the experimental data more satisfactorily for some of the states than the normal optical and Michel potentials.

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Four-nucleon pickup reaction on 12 ⩽ A ⩽ 94 nuclei

Cited by 43 publications

References 41 publications

Study of pairing and clusterisation in light nuclei through nuclear break-up

Study of pairing and clusterisation in light nuclei through nuclear break-up

Pairing and quartetting in medium mass nuclei

Analysis of the normal optical, Michel and molecular potentials on the 40Ca(6Li, d)44 Ti reaction

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