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Korkmaz, E.; Bland, L. C.; Jacobs, W. W.; Throwe, T. G.; Vigdor, And S.; Green, M. C.; Jolivette, P.L.; Brown, J.D.

doi:10.1103/physrevlett.58.104

Cited by 23 publications

(5 citation statements)

References 18 publications

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“…This state has been observed in the 13 C(p, π) reaction [28,38] where it was assigned a spin-parity of 5 − . It is not observed in the 14 C(e, e ) [39] and 14 C(π, π ) [40,41] measurements; supporting the assignment of a 5 − configuration which cannot be reached by 1p1h excitations from the ground state of 14 C. It can thus be clearly described as a core excitation and it is demonstrated to be the analog of a 5 − state in 14 N. Thus it is proposed to have a ( 12 C 2 + ⊗ p 1/2 ⊗ d 5/2 ) configuration [28,38] and consequently a negative parity. The state has a considerable width for α-decay to the ground state of 10 Be.…”

Section: 87 Mevmentioning

confidence: 73%

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Measurement of α and neutron decay widths of excited states ofC14

et al. 2008

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Section: 87 Mevmentioning

confidence: 73%

“…It is also evident that an unnatural parity state strongly favors neutron decay to excited states, as was experimentally observed. This state is populated in the 13 C(p, π + ) [28,38] and 14 C(π, π ) [40,41] reactions, indicating a core excitation. It has previously been given a tentative spin-parity assignment of 6 − [18].…”

Section: E 186 Mevmentioning

confidence: 98%

Measurement of α and neutron decay widths of excited states ofC14

et al. 2008

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“…In an experiment at Indiana, Korkmaz et al. [59] have found that there is evidence from the ' C(p, 7r ) reaction at 200 MeV suggesting that the asymmetry for pn -+~p p might be positive. However, for the only free results available which are at 400 MeV and for the peak region only, a swing from positive to negative is found [57].…”

Section: Analyzing Powermentioning

confidence: 99%

Total cross sections and analyzing powers for the reactionp+p→p+p+π0near threshold

et al. 1991

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We have studied the reaction p +p -+p+p+m from 320 to 500 MeV by detecting the y rays from m decay in coincidence in two large NaI crystals. The obtained differential and total cross sections of the pions are in agreement with previous measurements but are of a higher precision. We have also measured the pion analyzing powers; the first measurement of this observable. Our results are compared with those for the reactions np~N Nm. with confusing conclusions concerning the contribution of o. », the zero isospin pion production channel.

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“…One is motivated to relate these stable continuum results [see Fig. 1 (a)] to the behavior for free Pvo\n-+ppn~, because analogous (/?poi,7r + ) data closely resemble 3,6 measured 5 A y (0) for the corresponding free processes Ppoip-^ dn + and Ppo\P~^ pn7r + . The K + comparison is illustrated in Fig.…”

Section: Comment On "Pion Absorption On the Diproton"mentioning

confidence: 99%

Comment on ‘‘Pion absorption on the diproton’’

1987

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Comment on "Pion Absorption on the Diproton"In a recent Letter, Piasetzky et al l report a phaseshift analysis of cross-section data for the quasifree absorption (in 3 He) of 62.5-MeV n~ by a ^o proton pair. The analysis produces five discrete possible solutions (for l n -p P ^2), yielding quite different predictions for the polarization P y (6) of the outgoing nucleons. We point out here that analyzing powers A y (9) measured for (ppoN^~) reactions on nuclei may already provide the (quasifree) polarization data needed to distinguish the correct solution.By time-reversal and rotational invariance, P y (0) for n~pp-+py Q \n equals A y (0) for K~ production at the same cm. angle via Ppo\n^ ppn~. The latter reaction, not yet studied with polarized free nucleons, is known 2 to be the dominant process occurring inside nuclei in nearthreshold A(p,n~)A + \ transitions. Recently, we have shown 3 that for continuum K~ production (averaging over many final nuclear states), A y (6) appears independent of target and excitation energy. One is motivated to relate these stable continuum results [see Fig. 1 (a)] to the behavior for free Pvo\n-+ppn~, because analogous (/?poi,7r + ) data closely resemble 3,6 measured 5 A y (0) for the corresponding free processes Ppoip-^ dn + and Ppo\P~^ pn7r + . The K + comparison is illustrated in Fig. 1(b), where p^p-^dn^ data are transformed to the /^-nucleus frame as appropriate 3 for an on-shell twobody reaction with a target proton moving toward the projectile. The growing deviation seen at large angles between the nuclear data and quasifree expectations may reflect the neglect of distortions and the full momentum distribution of struck protons in our simple kinematic transformation.We have now applied this same transformation 3 to the phase-shift predictions in Ref. 1 for comparison to the (ppoh^~) continuum data in Fig. 1(a). Two important assumptions, over and above that of a quasifree twonucleon n~ production mechanism, underlie this comparison. We expect the undetected low-energy proton pair to be constrained to a ^o state, not by nuclear structure (as in the 3 He case), but rather by the shortrange interaction causing the high-momentum-transfer (450-700 MeV/c) (p,n) reaction. 2 [A similar assumption, with regard to the 3 S\ np state, appears successful in the (/?poi,7r + ) comparison.] We further assume that the Ppo\n-^ppn~ predictions for a single bombarding energy (rj ab =412 MeV) in Ref. 1 can be applied without modification over the entire range (325-390 MeV) relevant to the quasifree K~ production in our kinematic transformation. [Over the same range, measured 5 A y (6) for Ppo\p-+ dn + undergoes little change in angular shape.] Only a very strong energy dependence could alter the qualitative conclusions drawn below.Of the five phase-shift solutions obtained, 1 only one (No. 2) yields A y (0) resembling the (ppo\,x~) continuum data. Here, the agreement [ Fig. 1(a)] is excellent at C(p>-) 0 =-19 MeV =-2IMeV LU O Q_ 21 M > _l < 23 < 'C( p> + ) C o =*20 MeV •=*22MeV...

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C12,13(p

Cited by 23 publications

References 18 publications

Measurement of α and neutron decay widths of excited states ofC14

Measurement of α and neutron decay widths of excited states ofC14

Total cross sections and analyzing powers for the reactionp+p→p+p+π0near threshold

Comment on ‘‘Pion absorption on the diproton’’

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