Spectroscopy of Odd-Odd Nuclei with Direct (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>α</mml:mi></mml:math>) Reactions

Daehnick, W. W.; Park, Y. S.

doi:10.1103/physrevlett.20.110

Phys. Rev. Lett.

1968

DOI: 10.1103/physrevlett.20.110

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Spectroscopy of Odd-Odd Nuclei with Direct (d, α) Reactions

W. W. Daehnick¹,

Y. S. Park²

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1969

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Cited by 18 publications

(2 citation statements)

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“…Figure 2 Table L contains VAP distributions corresponding to predominantly L =2 transfers for J = l states (0.71 MeV in 30 P and 0.46 MeV in 38 K) and J = 3 states The L values can be determined from the differential cross section. 14 The data show distinctly different oscillatory patterns for different J transfers, but similar patterns for the same J transfers, and agree reasonably well with the appropriate DWBA calculations for the reaction 32 S^,«) 30 P. Figure 2(c) contains results for L =4 tranfers. The reaction 28 Si(i,a) 26 Al(g.s.)…”

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confidence: 76%

Determination of Angular-Momentum Transfers for (d, α) Reactions Using Polarized Beams

et al. 1978

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in which the pion absorption is certainly not negligible. Finally the effect of P D in our calculation and in FR should be further investigated.We should like to express our thanks to Professor A. W. Thomas for giving helpful information about his results and for encouraging correspondence. We are also very grateful to Professor Y. Avishai for stimulating discussions and for his critical reading of the manuscript. i A. W. Thomas, Nucl. Phys. A258, 417 (1976). 2 R. M. Woloshyn, E. J. Moniz, and R. Aaron, Phys. Rev. C 13, 286 (1976); V. B. Mandelzweig, H. Garcila-The (d,a) reaction involves the pickup of two nucleons (sometimes considered as a deuteron cluster) from a nucleus. It is useful in spectroscopic studies of the residual nuclei, which are frequently odd-odd, and for studying the neutronproton correlations in the ground state of the target nucleus. The analysis of these reactions is considerably more complicated than single-nucleon transfer reactions, since most final states can be populated by several orbital angular momentum transfers (L). Each L and J value transferred, where J is the total angular momentum of the pair, can also involve a combination of two-particle configurations. Since differential cross sections are often inadequate to unravel the relative contributions of different angular momenta to the (d,a) reaction, it is important to investigate the extent to which vector-analyzing-power (VAP) measurements using polarized beams can improve understanding of the reaction and the final states involved. Several VAP measurements for the (d,a) reaction have been reported recently. 1 " 3 These measurements, however, do not comprise as complete a study of a zo, and J. M. Eisenberg, Nucl. It is by now well-established that VAP measurements for single-nucleon pickup and transfer reactions distinguish between; =1 +| and 3=1-k transfers 4 (where j and I are total and orbital angular momenta of the transferred nucleon). The present Letter shows that analogous effects exist in VAP distributions for a two-nucleon transfer reaction depending on the J and L of the transferred pair of nucleons. For a spin-zero target nucleus, the L and J transferred from the nucleus determine the spin and parity of the final nuclear state and for each L involved in populating this state, J may equal either L+l, L, or 11/ -II. Earlier theoretical work 5 stated that, in the absence of spin-dependent distortions of the incoming and outgoing waves and for a unique L and J, the vector analyzing powers will be proportional to -L, 1, andl/+l, respectively, for the above J values.In order to consider cases involving only one important angular-momentum component to the reaction, measurements were made with spin-The angular distribution patterns of vector analyzing powers for (d 9 a) reactions on s~d shell nuclei at energies near 16.5 MeV depend distinctly on the orbital angular momentum L and total angular momentum J transferred. Examples of L -0, L = 2, and L = 4 transfers have been obtained for 28 Si, 32 S, and 40 Ca targets, and these ...

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confidence: 76%

Determination of Angular-Momentum Transfers for (d, α) Reactions Using Polarized Beams

et al. 1978

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“…In regions of considerable configuration mixing, we generally expect J 0^+ and ^even" levels to be reached by a mixture of two L {L-J-l and L'-J + 1) values. 7 The correlation between calculated and observed levels is further suggested by the relative intensities of the L transfer. For example, calculations 8 based on the configuration mixed wave functions of Kuo indicate intense L = 3 dominance over L = 1 for exciting the 0.267-MeV level, while L = 1 should be dominant for the 0.633-MeV level, even though both states are J ir = 2~.…”

mentioning

confidence: 88%

Investigation of Neutron-Proton Hole States inTl206by the ReactionPb208
Lewis
¹
,
Daehnick
²

1969
Phys. Rev. Lett.
Self Cite
12
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The neutron-hole, proton-hole states of Tl 206 have been studied by the direct reaction Pb 208 (d, a)Tl 206 with 17-MeV deuterons. The experimental resolution of 15 keV or better permitted the detection of many two-hole states, most of them previously unknown. For most levels L values could be extracted from the comparison of microscopic distortedwave Born approximation (DWBA) calculations with experimental angular distributions. The experimental level energies and J 71 " assignments (or limits) are compared with recent calculations by Kuo and are found to be in good agreement.The study of odd-odd nuclei is fundamental to the understanding of the neutron-proton interaction in nuclear matter. The two-body wave functions of the neutron-proton type are distinctive in that they are sensitive to the T = 0 as well as the T= 1 components of the two-nucleon force. Oddodd nuclei in the lead region are of special importance since the doubly magic Pb 208 ground state appears from recent data to be the best vacuum (i.e., inert) state of any nucleus and serves as an ideal nuclear core for single-particle orbitals. 1 The direct reaction Pb 20 V, a/)Tl 206 is ideally suited for the excitation of the theoretically most important levels in Tl 206 , i.e., those formed by coupling single proton-hole and neutron-hole orbitals in the doubly magic Pb 208 core. The few single-nucleon-exchange reactions reaching levels of this important, but poorly known nucleus, such as the reactions 2 Tl 205 (d,£)Tl 206 or Pb 207 (/, a)Tl 206 , populate only some of the two-hole states of interest. Early calculations 3 for Tl 206 had not been able to explain the limited information available for this nucleus up to that time. For example, these calculations predict the splitting of [s^p^jj^Q and [s-|-i£i-iJ J= 1 to be -60 keV, whereas experimentally it appears to be 304 keV. Calculations by Kim 3 predict 16 twohole levels below 2.5 MeV, whereas at least 32 such levels have been excited in the reaction Pb 208 (d, Q?)T1 206 (a partial list is given in Fig. 1). Recent shell-model calculations by Kuo 4 with realistic forces (Hamada-Johnston), 11 singlehole orbitals, and the inclusion of core polarization as a perturbation have yielded a spectrum of high level density even below 2-MeV excitation containing many states with very appreciable configuration mixing (see Fig. 1).The direct (d, a) reactions are expected to excite all T< states with a proton-neutron-hole component with the exception of J 7r = 0 + states, states of pure (j 2 ) e ven configuration, and states of such configuration as to give rise to coherent cancellation of the amplitude of the deuteron radial form TRACKS /0.2 mm 5

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The 36Ar(d, α)34Cl reaction at 19 MeV

Horoshko

Shapiro

1972

Nuclear Physics A

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Spectroscopy of Odd-Odd Nuclei with Direct (d, α) Reactions

Cited by 18 publications

References 6 publications

Determination of Angular-Momentum Transfers for (d, α) Reactions Using Polarized Beams

Determination of Angular-Momentum Transfers for (d, α) Reactions Using Polarized Beams

Investigation of Neutron-Proton Hole States inTl206by the ReactionPb208
Lewis
¹
,
Daehnick
²

1969
Phys. Rev. Lett.
Self Cite
12
0
0
0
View full text Add to dashboard Cite

The 36Ar(d, α)34Cl reaction at 19 MeV

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Spectroscopy of Odd-Odd Nuclei with Direct (d, α) Reactions

Cited by 18 publications

References 6 publications

Determination of Angular-Momentum Transfers for (d, α) Reactions Using Polarized Beams

Determination of Angular-Momentum Transfers for (d, α) Reactions Using Polarized Beams

Investigation of Neutron-Proton Hole States inTl206by the ReactionPb208Lewis1, Daehnick2 1969Phys. Rev. Lett.Self Cite12000View full textAdd to dashboardCite

The 36Ar(d, α)34Cl reaction at 19 MeV

Contact Info

Product

Resources

About

Investigation of Neutron-Proton Hole States inTl206by the ReactionPb208
Lewis
¹
,
Daehnick
²

1969
Phys. Rev. Lett.
Self Cite
12
0
0
0
View full text Add to dashboard Cite