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(p,t) reactions on nuclei in the rare earth region

Journal Article · · Nucl. Phys., A, v. A213, no. 2, pp. 221-266
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The (p,t) reactions on isotopic targets of /sup 178,180/Hf and all the stable isotopes of Yb and on natural targets of Gd, Dy, Er, Hf, Ta, W, Os and Au were studied at a beam energy of 19 MeV with an average resolution of 12 keV. A split-pole magnetic spectrometer was used to measure (p,t) Q-values and absolute differential cross sections. On the basis of angular distribution shapes definite 0+ and tentative 2/sup +/ assignments were made. Rotational bands were identified assuming an I(I + 1) spacing. The (p,t) reaction populates excited 0/ sup +/ states strongly in /sup 174/Yb, /sup 176/Hf, /sup 166/Yb and se veral Gd, Dy and Er isotopes. The /sup 174/Yb and /sup 176/Hf 0/sup +/ states are discussed i n terms of the pairing phase transition and in terms of Nilsson orbitals with unequal (p,t) reaction amplitudes. Members of gamma and octupole vibrational bands were observed in the even-N nuclei. The lowest L = 0 transfers to states in /sup 169,171/Yb were found to have less than 55% of the strength to ground states in adjacent even-N nuclei. A strong L = O transfer to a state at 1513 keV in /sup 171/Yb indicates the presence of a possible K = 0 core vibration coupled to the unpaired 5/2STA512! neutron. The natural targets have furnished information on trends in cross sections for members of ground bands, gamma bandheads, 3/sup -/ octupole states, and strongly excited 0+ states. (auth)
Research Organization:
Univ. of Minnesota, Minneapolis
Sponsoring Organization:
USDOE
NSA Number:
NSA-29-001700
OSTI ID:
4430862
Report Number(s):
COO--1265-131
Journal Information:
Nucl. Phys., A, v. A213, no. 2, pp. 221-266, Journal Name: Nucl. Phys., A, v. A213, no. 2, pp. 221-266; ISSN NUPAB
Country of Publication:
United States
Language:
English

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