The 15N(d, τ)14C reaction and high-lying T = 1 states in mass-14 nuclei: A determination of 1p32 diagonal matrix elements

Kaschl, G.Th.; Mairle, G.; Mackh, H.; Hartwig, D.; Schwinn, U.

doi:10.1016/0375-9474(71)90205-3

Cited by 21 publications

(5 citation statements)

References 29 publications

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“…are probably not so surprising in the light of the findings for the 2 + transitions in 15 N(d, 3 He) 14 C measurements [19].…”

Section: Resultsmentioning

confidence: 84%

“…It is worth stressing that also the 15 N(d, 3 He) 14 C measurements reported in Ref. [19] do not provide evidence for a sizable population of a 0 + state for E x ≈ 10 MeV. The nuclear-structure calculations of Refs.…”

Section: Resultsmentioning

confidence: 86%

“…to the lowest 2 + state in 14 C. In the analysis of the transfer reaction 15 N(d, 3 He) 14 C measurement reported in Ref. [19], it was found that the low-lying 2 + strength is fragmented over at least three states. In the same paper, a careful analysis of the data led to the conclusion that "whereas the J π =0 + and 1 + ,T=1 states of mass 14 are rather pure (1p) −2 states, the 2 + ,T=1 states are STRONGLY mixed with core excitations of the (2s 1/2 , 1d) 2 type".…”

Section: Resultsmentioning

confidence: 97%

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The 16 O(e,e‘pp)14 C reaction to discrete final states

Ryckebusch

Nespen

2004

Eur. Phys. J. A

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This paper reports on the first measurement of the 16 O(e,e ′ pn) 14 N reaction. Data were measured in kinematics centred on a super-parallel geometry at energy and momentum transfers of 215 MeV and 316 MeV/c. The experimental resolution was sufficient to distinguish groups of states in the residual nucleus but not good enough to separate individual states. The data show a strong dependence on missing momentum and this dependence appears to be different for two groups of states in the residual nucleus. Theoretical calculations of the reaction using the Pavia code do not reproduce the shape or the magnitude of the data.

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“…are probably not so surprising in the light of the findings for the 2 + transitions in 15 N(d, 3 He) 14 C measurements [19].…”

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 97%

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The 16 O(e,e‘pp)14 C reaction to discrete final states

Ryckebusch

Nespen

2004

Eur. Phys. J. A

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“…[36]) and the ratio of spectroscopic factors for 14,16,18,20 C (from Ref. [37] for 14 C and from this work for 16,18,20 C).…”

Section: Statementioning

confidence: 78%

Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Syndikus,

Petri,

Macchiavelli

et al. 2020

Preprint

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The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z = 6 spin-orbit shell gap towards the neutron dripline. To do so, we employed A N(p,2p) A−1 C quasi-free scattering reactions to measure the proton component of the 2 + 1 state of 16,18,20 C. The experimental findings support the notion of a moderate reduction of the proton 1p 1/2 − 1p 3/2 spin-orbit splitting, at variance to recent claims for a prevalent Z = 6 magic number towards the neutron dripline.

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“…For the data shown in Figure 4 the experimental resolution in the excitation (or missing) energy of 14 C was of the order of 4 MeV and the individual states could not be resolved in the missing energy spectrum. On the other hand, high-resolution 16 O(e, e ′ pp) investigations from Mainz [52] and 15 N(d, 3 He) 14 C transfer reactions [53] allow to infer that the lowest excitation-energy bin (-4 MeV ≤ E x ≤4 MeV) is exclusively fed through the 14 C ground-state transition, whereas the second (4 MeV ≤ E x ≤9 MeV) and third bin (9 MeV ≤ E x ≤14 MeV) are mainly fed through the |2…”

Section: B Final-state Interactionsmentioning

confidence: 99%

Meson and isobar degrees of freedom inA(e→,e′p
Ryckebusch
¹
,
Debruyne
²
,
Nespen
³

et al. 1999
Phys. Rev. C
35
0
13
0
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The effect of meson and isobar degrees of freedom in A( e, e ′ p) and A(e, e ′ n) is studied for fourmomentum transfers Q 2 in the range between 0.2 and 0.8 (GeV/c) 2 . The calculations are performed in a non-relativistic framework with explicit (N, ∆, π) degrees-of-freedom. For the whole range of momentum transfers under investigation the relative effect of the meson-exchange and isobar degrees of freedom is significant. At low missing momenta and quasi-elastic conditions, a tendency to reduce the (e, e ′ p) and (e, e ′ n) differential cross sections is noticed. The greatest sensitivity is found in the interference structure functions WLT and WT T . The recoil polarization observables, on the other hand, are moderately affected by the meson-exchange and ∆-isobar currents. I. INTRODUCTIONSystematic investigations of A(e, e ′ p) reactions at Saclay, NIKHEF, Mainz and Bates have produced an impressive amount of data for various target nuclei [1]. For the sake of minimizing the uncertainties with respect to the reaction mechanism, a large fraction of these investigations were done under or close to quasi-elastic kinematics (Bjorken. These data sets highlight at the same time the success and the limits of the independent-particlemodel (IPM) for atomic nuclei [2]. Indeed, after corrections for final-state interactions and Coulomb distortions of the electron probe, the shape of the deduced proton momentum distributions are systematically in line with the predictions of modern formulations of the nuclear IPM. On the other hand, below the Fermi momentum the absolute magnitude of the deduced momentum distributions are systematically, i.e. independent of the nucleon momentum, lower than IPM predictions. To cut a long story short, the major conclusion from this world-wide (e, e ′ p) effort seems that an appropriate non-relativistic picture of the nucleus is roughly compatible with 70% mean-field behaviour and 30% "correlations" an observation which is still frequently ignored in various nuclear structure calculations and model developments. The energy of the available electron beams with a large duty factor (ǫ ≤ 1 GeV) made that most of this aforementioned (e, e ′ p) work was done at four-momentum transfers of the order Q 2 = −q µ q µ ≤ 0.2 (GeV/c) 2 . With the advent of the TJNAF and an upgraded Mainz electron facility higher values of Q 2 come into reach of experimental exploration.Amongst the major physics' goals motivating exclusive (e, e ′ p) measurements from finite nuclei at higher momentum transfer (Q 2 ≥ 0.2 (GeV/c) 2 ) one can mention the following ones. The higher Q 2 conditions and unmistakingly smaller distance scales probed should make it feasible to achieve a better understanding of the short-range mechanisms in nuclei. At the same time, one could hope to find experimental evidence for the onset of quark and gluon degrees of freedom. Presumably, the most convincing evidence pointing into that direction could come from measurements for processes that are fairly well understood at lower Q 2 (like (e, e ′ p) at...

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The 15N(d, τ)14C reaction and high-lying T = 1 states in mass-14 nuclei: A determination of 1p32 diagonal matrix elements

Cited by 21 publications

References 29 publications

The 16 O(e,e‘pp)14 C reaction to discrete final states

The 16 O(e,e‘pp)14 C reaction to discrete final states

Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Meson and isobar degrees of freedom inA(e→,e′p
Ryckebusch
¹
,
Debruyne
²
,
Nespen
³

et al. 1999
Phys. Rev. C
35
0
13
0
View full text Add to dashboard Cite

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The 15N(d, τ)14C reaction and high-lying T = 1 states in mass-14 nuclei: A determination of 1p32 diagonal matrix elements

Cited by 21 publications

References 29 publications

The 16 O(e,e‘pp)14 C reaction to discrete final states

The 16 O(e,e‘pp)14 C reaction to discrete final states

Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Meson and isobar degrees of freedom inA(e→,e′pRyckebusch1, Debruyne2, Nespen3 et al. 1999Phys. Rev. C350130View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Meson and isobar degrees of freedom inA(e→,e′p
Ryckebusch
¹
,
Debruyne
²
,
Nespen
³

et al. 1999
Phys. Rev. C
35
0
13
0
View full text Add to dashboard Cite