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Zuker, A. P.

doi:10.1103/physrevlett.23.983

Cited by 125 publications

(42 citation statements)

References 17 publications

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“…The values shown in Tab. I were obtained with the OXBASH code [8] and the ZBM interaction [9] in the 1p 1/2 , 1d 5/2 and 2s 1/2 shells space. It predicts that the first six low lying states can be described mainly (with θ 2 > 0.5) by single particle con- [10].…”

mentioning

confidence: 99%

Spectroscopy of 18Na: Bridging the two-proton radioactivity of 19Mg

Assié¹,

Santos²,

Davinson³

et al. 2012

Physics Letters B

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The unbound nucleus 18 Na, the intermediate nucleus in the two-proton radioactivity of 19 Mg, was studied by the measurement of the resonant elastic scattering reaction 17 Ne(p, 17 Ne)p performed at 4 A.MeV. Spectroscopic properties of the low-lying states were obtained in a R-matrix analysis of the excitation function. Using these new results, we show that the lifetime of the 19 Mg radioactivity can be understood assuming a sequential emission of two protons via low energy tails of 18 Na resonances. From near to beyond the drip-lines, the nuclear force is no longer able to bind the interacting nucleons leading to instability of nuclei with respect to nucleon emission. On the proton-rich side of the chart of nuclides, the pairing force may lead to a situation where a drip-line nucleus is bound with respect to single proton emission but unbound to two-proton emission [1,2]. Several types of two-proton emitters have been observed. On the one hand, there are the short-lived (τ 1/2 ≤ 10 −18 s) light nuclei such as 6 [6] when assuming only d-wave single-particle states in the low-lying structure of 18 Na and thus a dominant d 2 single-particle configuration for 19 Mg. Theoretical calculations of properties of 19 Mg depend strongly on the assumption made about the structure of 18 Na and its mirror nucleus. In this letter, we investigate both experimentally and theoretically the low lying spectrum of 18 Na. We strongly refine the knowledge about the lowlying spectrum of 18 Na and find that there are also lowlying s-wave states. These states should strongly boost the expected two-proton width.On the theoretical side, the structure of 18 Na has been predicted assuming a core of 17 Ne + proton structure [6] or by coupling a neutron hole to the lowest states in 19 Na [7]. In both cases, the low-lying structure of 18 Na is found to have d-wave configuration. In the following, another theoretical approach is described and predicts also low lying s-wave states. The dimensionless reduced widths θ 2 (sometimes called spectroscopic factors) where estimated with the shell model. The values shown in Tab. I were obtained with the OXBASH code [8] and the ZBM interaction [9] in the 1p 1/2 , 1d 5/2 and 2s 1/2 shells space. It predicts that the first six low lying states can be described mainly (with θ 2 > 0.5) by single particle con-

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mentioning

confidence: 99%

Spectroscopy of 18Na: Bridging the two-proton radioactivity of 19Mg

Assié¹,

Santos²,

Davinson³

et al. 2012

Physics Letters B

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“…However, using Zuker's wave functions (Zuker et al 1968;Zuker 1969) we note the interesting fact that the overlap of the 19F ground state wave function with that of 15N* (5·27 MeV) plus an a particle is large; the Zuker wave functions give a lower limit of 0·2. This nonzero overlap suggests a two-step model of the reaction mechanism in which the incident photon is absorbed by a nucleon which then is reabsorbed and scatters from an (X-particle cluster, the latter being emitted.…”

Section: Introductio~mentioning

confidence: 96%

“…The dipole states of 19F must then have wave functions which are admixtures of the 19F ground state wave function modified by: (i) the excitation of one s-d nucleon to the 2p-If shell, or (ii) the excitation of one Ip nucleon to the 2s-ld shell. The wave functions of the dipole states so formed, and of an a particle plus the 15N (5·27 MeV) state, with its wave function as given by Zuker et al (1968) and Zuker (1969), are orthogonal. Since the 15N (5·27 MeV) state wave function consists of components with two and four holes in the 1 p shell, and we demand that the nucleons constituting the emitted a particle be in a relative s state before emission, the overlap integral described must be zero.…”

Section: Introductio~mentioning

confidence: 99%

“…The first requires the presence in the 15N ground state wave function of configurations of the type (IP3(2)8 (lP1(2)1 (ld)2 or (1 P3(2)8 (lP1/2/ (2S1(2)2. According to Zuker et al (1968) and Zuker (1969), the intensity of the former configuration in the 15N ground state wave function is approximately 20%.…”

Section: N(r T) 12 C* (4·43 Mev) Reactionmentioning

confidence: 99%

“…To discuss this (1', IX) reaction, let us assume the wave function of the 19F ground state be as given by Zuker (1969;see also Zuker et aI. 1968).…”

Section: Introductio~mentioning

confidence: 99%

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