This work was supported by the National Science Foundation Grants NSF PHY 78-22774 A03, NSF PHY 81-14339, and by Indiana Universit

Collins, J.C.

Foster, C.C.

Friesel, D.L.

Hall, J.R.

Jacobs, W.W.

Jones, W.P.

Kaitchuck, M.D.

Schwandt, P.

Stephenson, E.J.

English

IUScholarWorks (Indiana University)

ANALYZING POWERS FOR DEUTERON-INDUCED REACTIONS LEADING TO CONTINUUM FINAL STATES E.J. Stephenson, J.C. Collins, C.C. Foster, D.L. Friesel, J.R. Hall, W.W. Jacobs, W.P. Jones, M.D. Kaitchuck, and P. Schwandt Indiana University Cyclotron Facility, Bloomington, Indiana 47405 Measurements have been made of the cross section, vector (Ay), and tensor (Ayy) analyzing power for various inclusive reactions initiated by 80-MeV polarized deuterons incident on a 5 8 ~ i  target. Solid-state telescopes using both Silicon and high-purity Germanium detectors were used to observe outgoing p, d, t, 3 ~ e ,  and 4 ~ e  over a broad range of energies. The experimental details were reported in the 1980 IUCF Scientific and Technical ~e~0rt.l Analysis of the spectra is now complete and samples of the analyzing powers are shown in Figs. 1-3. For the outgoing deuterons (Fig. l), both Ay and Ayy rise with increasing angle and with outgoing deuteron energy, and match smoothly onto the elastic scattering . angular distribution. Thus, the analyzing power of the continuum reflects the spin-orbit distortions present in the entrance channel. Figures 2 and 3 show that this observation is true even when there is mass transfer. In all cases, the vector analyzing power departs from zero at the smallest angles and outgoing energies. Thus reactions initiated by spin-down deuterons disappear first as the scattering Pi ure 1. Analyzing powers ( and A, ) for deuterons emerging from d + 5 8 ~ i  inelastic scattering as a function ofgoutgoing deuteron energy. ?he contrnuum is divided into 2.5 MeV bins (crosses); discrete states are shown by points. 58 Ni (d,d') Ed=80 MeV I A~ 0 I I I I 1 30" - 3 +++++++s++*++t.t-t+- 4- a L \ 58 Ni (d, p) Ed = 80 MeV Figure 2. Analyzing powers (Ay and Ayy) for protons emerging from the 58~i(d,p) reaction as a function of outgoing proton energy. The continuum is divided into 2.5 MeV bins (crosses); discrete states are shown by points. angle and outgoing energy increase. Later, reactions analyzing power. This excitation marks the location of initiated from the m=O projection disappear, causing 4+ strength in 58~i. A detailed analysis of other Ayy to rise. This observation is consistent with the low-lying 4+ states (not shown in Fig. 1) gives similar classical picture of the spin-dependence in rainbow results. The analyzing power for outgoing protons at scattering .2 60" does not rise monotonically (see Fig. 2). The In Figs. 1-3, the points at large outgoing energy apparently larger analyzing power near 40 MeV may come are the results of an analysis of the prominent from breakup protons. Especially at 90°, fluctuations discrete states in the spectrum. The similarity in Ay and Ayy for outgoing protons seem correlated, and between their analyzing powers and the trend of the may be tied to the excitation energies of various continuum shows that the spin-orbit distortions are single-particle states. For two-nucleon transfer (see more important than spin or mass transfer in Fig. 3), the vector analyzing power is smaller in determining the features of the analyzing power. magnitude, and structure effects seem more important. Nevertheless, some influence of the structure of the The negative point at 60° is the excitation of a strong final state can be found in this data. 7+ state in 56~o. Here, the analyzing power is Outgoing deuterons at 90' and 66 MeV (see Fig. 1) dominated by spin transfer (j = R + 1 in this case) show a marked reduction in the vector and tensor and not rainbow scattering. 96 Figure 3. Vector analyzing power (Ay) for t, 3 ~ e ,  and '~e emerging from d + 588i reactions as a function of outgoing particle energy. The continuum is divided into 5 MeV bins (crosses); discrete states are shown by points. (d, t (d, 3 ~ e )  (d. a) Similar trends in the analyzing power have been 1) E.J. Stephenson, J.C. Collins, C.C. Foster, D.L. Friesel, J.R. Hall, W.W. Jacobs, W.P. Jones, M.D. observed at similar energies/nucleon with both Kaitchuck, and P. Schwandt, IUCF Scientific and Technical Report 1980, p. 100. polarized proton and deuteron projectiles .3s4 These 2) E.J. Stephenson, C.C. Foster, P. Schwandt, and trends are consistent with calculations using the DWBA D.A. Goldberg, Nucl. Phys. A359, 316 (1981). and appropriate distributions of final-state spin and 3) 8. Sakai, K. Hosono, N. Matsuoka, S. Nagamachi, K. Okada, K. Naeda, and H. Shimizu, Phys. Rev. Lett. strength.3s4 - 44, 1193 (1980). I I 1 I I - 30' + - -t- - I 0 4) H. Sakai, N. Matsuoka, K. Hatanaka, K. Okada, and H. Shimizu, Phys. Rev. C 24, 2766 (1981). I ++++t ++++ +t I 1 I I 1 I I I I I - - + I t  so0 +++tt yt  +- ++ +++++++++ 0 - - I t f I I I 1 ' I I I I I I I I 1 - - - it+ ++++ -+ + tttt +++ tt,ttttt 90" 0 - i - 0 100 0 100 0 Ex (MeV) I I I 1 I - I +++t+++u) 1- C - 

Analyzing Powers for Deuteron-Induced Reactions Leading to Continuum Final States

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Analyzing Powers for Deuteron-Induced Reactions Leading to Continuum Final States

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