NUCLEAR REACTIONS 34S(t, 3He),~4Mg(t, 3He), E =23.0 MeV; measured o(8). P deduced levels. New mass of 3 P. No evidence for previously reported state in 24Na.are due to the 3 S(t, 3He)3 P reaction. 15The S(t, 'He)"P reaction has been used to study the mass and low-lying excited states of P, using 23 MeV tritons and a quadrupole-dipole-dipole spectrometer. The mass excess of "P is -24545 (20) keV. Excited states have been observed at E"=423, 1605, 2225, 2309, and (3345) keV (+10 keV). Spectra of the ' Mg(t, 'He) Na reaction show no evidence for a previously reported state at E"=2.46 MeV in Na.
No abstract
A study of the (t,p) reaction on the two stable Ga isotopes has been performed. The reaction protons were analyzed in a quadrupole-dipole-dipole-dipole spectrometer with a resulting energy resolution approximately 18 keV. Levels up to about 3 MeV excitation energy in "Ga and 2.75 MeV in "Ga were measured with 11 new levels observed in the first case and 18 in the second. The angular distributions have been compared to pure distributions observed in the "'"Ge(t, p) reactions at the same energy and found to correspond mostly to pure angular momentum (L) transfer although mixing of L's is allowed. A number of new spins assignments are made for Ga levels and the results are used to discuss the spin of "'Zng, . The striking split. ting of the L = 0 strength in three approximately equal components, observed in "Ga, strongly supports a transition in nuclear deformation between N = 40 and 42, NUCLEAR REACTIONS 9'~G a (t P} Et =17 MeV &(0}
A systematic study of all of the stable even germanium isotopes by the (t,p) reaction has been performed.The reaction protons were analyzed in a quadrupole-dipole-dipole-dipole spectrometer with a resulting energy reso16tiori approximately 15 keV. Levels up to 3 MeV in excitation energy were measured and the angular distributions compared to distorted wave analysis. A number of new spin assignments are made in the heavier germanium nuclei. Examination of the systematic trend of the ground state as well as various excited levels strongly supports a transition in nuclear deformation between N = 40 and N = 42. The data also indicate the effects. of the approaching shell closure at N = 50. NUCLEAR REACTIONS '7 '7 Ge(t, P), E&=17 MeV 0 (8), Dgl ana&ysis.ing. Their areal densities and thej. r isotopic . enrichments are reported in Table I. The outcoming protons were analyzed by a quadrupoledipole-dipole-dipole (Q3D) type I& magnetic spectrometer and detected by a hei. ical cathode. position sensitive proportional counter of one meter length. " The overall proton energy resolution of 15-20 keV is essentially due to the target thickness. The levels of residual nuclei were observed gp to 3.1-MeV excitation energy. Angular distributions were obtained from spectra-taken 19 1224
The '"' '"Pt{t g) reactions have been measured with 17 MeV tritons on enriched and natural Pt targets. The level structure of ' Pt is probed for the first time, and several new excited 0+ states have been identified in """'~Pt.Systematics in level structure of '" ' Pt are fairly constant, although there is evidence that '"'~Pt are becoming more vibrational in structure, with the y-unstable shape of the lighter Pt nuclides becoming more oblate-like.Systematics of L = 4 strengths are considered and can be qualitatively understood. The (t,p) strengths measured in the present study are combined with earlier Pt(p, t) and Os(t, p } measurements and compared with the systematics of two-neutron transfer strengths predicted by the interacting boson approximation, schematic, boson expansion, and pairing vibration models. NUCLEAR REACTIONS '94~P t(t, p), E=17 MeV; enriched targets; measured energy levels, o(8) in +'9 ' Pt; DWBA. NUCLEAR STRUCTURE L = 4 transitions, interacting boson approximation model, schematic model, boson expansion technique, pairing vibration model.
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