Proton-Neutron Coincidences in the High-Energy Photodisintegration of Lithium

Barton, M.Q.; Smith, J. H.

doi:10.1103/physrev.95.573

Cited by 40 publications

(6 citation statements)

References 2 publications

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“…These differences are given by the K 40 energy levels. 2,3 Using the definition Vj -(dz/2 /Wl V\d z/ 2 ./V/a/) we obtain (in MeV)…”

Section: Y Shadmi and I Talmimentioning

confidence: 98%

“…Since the ^3/2~2 configuration is in the middle of the d^2 shell, matrix elements of tensor operators with k>0, even, vanish between states with the same seniority [ST (28.41)]. The matrix elements of U p (2) vanish if J p =J p f -2 (for J p =J p '=0 the matrix elements of any U (fc) with k>0 vanish). Tensor operators with k odd are diagonal in the seniority scheme and their nonvanishing matrix elements are independent of n [ST (28.22)].…”

Section: Vj-ufjmjfj^uj'j^u^-v^w^jfj)mentioning

confidence: 98%

“…[2][3][4] It is therefore interesting to see whether the shell model can account for so many low lying odd parity levels with spins 3/2 and 1/2. Another question is whether there should be in the region below 4 MeV excitation in Ar 41 other levels which were not yet observed.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] Two of these are the quasi-elastic proton-proton scattering data 6 " 8 and the nucleon photoproduction data. 1 "" 5 In a quasi-elastic p-p scattering experiment (see, for example, reference 6) a target is bombarded by a fairly monochromatic proton beam and some suitable angular and energy correlations of the scattered and scattering protons are measured and analyzed to yield the proton binding…”

Section: Introductionmentioning

confidence: 99%

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Shell-Model Analysis of the Level Structure ofAr41

Shadmi

Talmi

1963

Phys. Rev.

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Levels of Ar 41 experimentally observed up to excitation energy of 4.5 MeV are considered. Using experimental data from neighboring nuclei the positions of 40 odd-parity states are calculated in the framework of the shell model. Good agreement is obtained for the low-lying levels. Approximate treatment of the dm 2 fv2 2 pm and dzn 2 f 7 n 2 pm configurations in addition to the dm 2 fin* ground configuration gives a semiquantitative account of all odd parity 3/2 and 1/2 levels up to 4.5 MeV. Many odd-parity levels with J>3/2 which were not yet found experimentally are predicted to be in this region.were actually observed. 1 We shall confine our treatment only to the odd parity states. There is much information on 1/7/2" configurations in this region 5,6 as well as on the ^3/2-/7/2 interaction. We shall try to extend previous calculations to the more complicated case of Ar 41 .We shall use throughout the //-coupling shell model assuming two body effective interactions between nucleons. Rather than use an arbitrary phenomenological potential we shall use matrix elements for the effective interaction as determined from neighboring nuclei. 7 In particular, the matrix elements of the ^3/2-/7/2 interaction will be taken from the level schemes of K 40 and CI 38 where excellent agreement has been obtained between theory and experiment. II. STRUCTURE OF THE ENERGY MATRIX IN THE SHELL MODELA possible complete set of wave functions in the ^3/2 2 /7/2 3 configuration is the following. We can take an antisymmetric state of the protons with a definite spin J Py an antisymmetric state of the neutrons with definite spin J n and couple J p and J n to a total /. In antisymmetric states, J p can be either 0 or 2 and J n can be 3/2, 5/2, 7/2, 9/2, 11/2, 15/2. In these states, dzji{J p )f7/2 3 (Jn)J, the mutual interaction energy of the protons, V(dz /2 2 J P ) is diagonal as well as that of the neutrons, F(/7/2 3 /n)-The actual values of these interaction energies will be taken from neighboring nuclei in which these configurations appear. The kinetic energy as well as the interaction of the dz/2 protons and / 7 /2 neutrons with the closed shells have the same value in all states of a given configuration. Since we are considering only level spacings, these energies will thus be omitted. However, the proton-neutron interaction has, in addition to diagonal elements, nonvanishing nondiagonal elements between states with 5 1. Talmi, in

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“…These differences are given by the K 40 energy levels. 2,3 Using the definition Vj -(dz/2 /Wl V\d z/ 2 ./V/a/) we obtain (in MeV)…”

Section: Y Shadmi and I Talmimentioning

confidence: 98%

Section: Vj-ufjmjfj^uj'j^u^-v^w^jfj)mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shell-Model Analysis of the Level Structure ofAr41

Shadmi

Talmi

1963

Phys. Rev.

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“…I) In the energy region of 200 F<J 300 Mev we have observed some phenomena which should support the quasi-deuteron model. 2 ), 3) But the reaction process in the intermediate energy region of 50"" 100 Mev is not yet known very well. The experimental data and the predictions from the quasi-deuteron model do not always agree with each other, as the instance is seen in the experiment by Whitehead et al,4) We examined carefully the approximations used in the quasi-deuteron model and found that the range of validity of the model is restricted above the photomeson threshold.…”

Section: § 10 Introductionmentioning

confidence: 98%

Photoprotons Emitted from Light Nuclei and Nuclear Shell Structure

Fujii¹

1963

Prog. Theor. Phys.

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The differential cross sections of photoprotons emitted from light nuclei at the photon energies of 50~ 100 Mev are explained using the direct interaction model. Some features reflecting the nuclear shell structure are pointed out ancl their relation to the information obtained from Cp, 2p) is discussed. § 10 IntroductionBecause of the progress of the experimental technique we come to have fairly detailed information on low energy nuclear photoeffect. At high energies the experimental data on nuclear photo-disintegrations have often been compared with the prediction from the quasi-deuteron model. I) In the energy region of 200 F

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Energetic Particle Emission in Nuclear Reactions

Boal

1985

Advances in the Physics of Particles and Nuclei

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Proton-Neutron Coincidences in the High-Energy Photodisintegration of Lithium

Cited by 40 publications

References 2 publications

Shell-Model Analysis of the Level Structure ofAr41

Shell-Model Analysis of the Level Structure ofAr41

Photoprotons Emitted from Light Nuclei and Nuclear Shell Structure

Energetic Particle Emission in Nuclear Reactions

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