Two-phonon character of the lowest electric dipole excitation in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>142</mn></mrow></msup></mrow></math></span>Nd and in other nuclei near shell closures

M. Wilhelm; S. Kasemann; G. Pascovici; E. Radermacher; P. von Brentano; A. Zilges

doi:10.1103/PhysRevC.57.577

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Two-phonon character of the lowest electric dipole excitation in $^{142}$ Nd and in other nuclei near shell closures

M. Wilhelm^1,2, S. Kasemann¹, G. Pascovici¹, E. Radermacher¹, P. von Brentano¹, and A. Zilges^1,2,3

¹Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
²Physics Department – WNSL, Yale University, New Haven, Connecticut 06520-8124
³Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany

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Phys. Rev. C 57, 577 – Published 1 February, 1998

DOI: https://doi.org/10.1103/PhysRevC.57.577

Abstract

A resonant inelastic proton scattering experiment was carried out to investigate the $γ$ decay of the lowest lying 1 $^{-}$ state in the $N$ =82 nucleus $^{142}$ Nd. A very high sensitivity for the detection of the $γ$ rays was achieved by combining the Osiris Cube array with a Euroball Cluster detector. The observed $γ$ decay of the dipole excitation is a direct proof of the dominant two-phonon character of the lowest 1 $^{-}$ state in this nucleus. A survey of the branching ratios in the magic neutron number $N$ =82 region and the energy systematics of candidates for two phonon 1 $^{-}$ states in other nuclei in the vicinity of various shell closures point to a high degree of harmonicity of the (2 $^{+} \otimes 3^{-})$ coupling.

References (28)

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[c1] A. Bohr and B. Mottelson, Nuclear Structure (Benjamin, New York, 1975), Vol. 2, and references therein.

[c2] A. Aprahamian, D. S. Brenner, R. F. Casten, R. L. Gill, A. Piotrowski, and K. Heyde, Phys. Lett.140B, 22 (1984).

[c3] R. F. Casten, Nuclear Structure from a Simple Perspective (Oxford University Press, New York, 1990), and references therein.

[c4] Minfang Yeh, P. E. Garrett, C. A. McGrath, and S. W. Yates, Phys. Rev. Lett. 76, 1208 (1996).

[c5] J. Enders, P. von Neumann-Cosel, V. Yu. Ponomarev, and A. Richter, Nucl. Phys. A612, 239 (1997).

[c6] M. Behar, Z. W. Grabowski, and S. Raman, Nucl. Phys. A219, 516 (1974).

[c7] F. R. Metzger, Phys. Rev. C 14, 543 (1976).

[c8] R. A. Gatenby, J. R. Vanhoy, E. M. Baum, E. L. Johnson, S. W. Yates, T. Belgya, B. Fazekas, Á. Veres, and G. Molnár, Phys. Rev. C 41, R414 (1990).

[c9] H. H. Pitz, R. D. Heil, U. Kneissl, S. Lindenstruth, U. Seemann, R. Stock, C. Wesselborg, A. Zilges, P. von Brentano, S. D. Hoblit, and A. M. Nathan, Nucl. Phys. A509, 587 (1990).

[c10] R. A. Gatenby, E. L. Johnson, E. M. Baum, S. W. Yates, D. Wang, J. R. Vanhoy, M. T. McEllistrem, T. Belgya, B. Fazekas, and G. Molnár, Nucl. Phys. A560, 633 (1993).

[c11] S. J. Robinson, J. Jolie, H. G. Börner, P. Schillebeeckx, S. Ulbig, and K. P. Lieb, Phys. Rev. Lett. 73, 412 (1994).

[c12] T. Belgya, R. A. Gatenby, E. M. Baum, E. L. Johnson, D. P. DiPrete, S. W. Yates, B. Fazekas, and G. Molnár, Phys. Rev. C 52, R2314 (1995).

[c13] R.-D. Herzberg, I. Bauske, P. von Brentano, Th. Eckert, R. Fischer, W. Geiger, U. Kneissl, H. Maser, N. Pietralla, H. H. Pitz, and A. Zilges, Nucl. Phys. A592, 211 (1995).

[c14] K. Heyde and C. DeCoster, Phys. Lett. B 393, 7 (1997).

[c15] R. V. Jolos (private communication).

[c16] M. Wilhelm, E. Radermacher, A. Zilges, and P. von Brentano, Phys. Rev. C 54, R449 (1996).

[c17] C. F. Moore, J. G. Kulleck, P. von Brentano, and F. Rickey, Phys. Rev. 165, 1312 (1968).

[c18] L. Bimbot, L. Lessard, S. Santhanam, R. Martin, O. Dietzsch, D. Spalding, K. Schechet, and J. L. Foster, Phys. Rev. C 9, 741 (1974).

[c19] R. Wirowski, M. Schimmer, L. Eßer, S. Albers, K. O. Zell, and P. von Brentano, Nucl. Phys. A586, 427 (1995).

[c20] J. Eberth, Prog. Part. Nucl. Phys. 28, 495 (1992).

[c21] J. Eberth, H. G. Thomas, P. von Brentano, R. M. Lieder, H. M. Jäger, H. Kämmerling, M. Berst, D. Gutknecht, and R. Henck, Nucl. Instr. Methods Phys. Res. 369, 135 (1996).

[c22] H. G. Thomas, Ph.D. thesis, Institut für Kernphysik, Universität zu Köln, Berlin, 1995.

[c23] R. M. Lieder (unpublished).

[c24] M. Wilhelm, J. Eberth, G. Pascovici, E. Radermacher, H. G. Thomas, P. von Brentano, H. Prade, and R. M. Lieder, Nucl. Instrum. Methods Phys. Res. A 381, 462 (1996).

[c25] M. W. Luig, S. Albers, F. Giesen, N. Nicolay, J. Rest, R. Wirowski, and P. von Brentano, Verh. Dtsch. Phys. Ges. 30, 736 (1995).

[c26] M. Grinberg and Ch. Stoyanov, Nucl. Phys. A573, 231 (1994).

[c27] J. K. Tuli, Nucl. Data Sheets 56, 607 (1989).

[c28] G. Kinleben and T. W. Elze, Z. Phys. A 286, 415 (1978).

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Two-phonon character of the lowest electric dipole excitation in $^{142}$ Nd and in other nuclei near shell closures

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Two-phonon character of the lowest electric dipole excitation in 142Nd and in other nuclei near shell closures

Abstract

References (28)

Two-phonon character of the lowest electric dipole excitation in $^{142}$ Nd and in other nuclei near shell closures