K. Ashibe

Level structure of N = 49 nuclei up to an excitation energy of 13 MeV by the (p, d) reaction

Abstract Levels up to an excitation energy of 13 MeV in the N = 49 nuclei, 87 Sr, 89 Zr, 91 Mo, and 88 Y, have been investigated by means of the (p, d) reaction. The incident proton energies were 52 and 55 MeV and the outgoing deuterons were analyzed with a broad-range magnetic spectrometer. The experimental angular distributions were compared with DWBA calculations and the l n values and spectroscopic factors were deduced. A number of new levels including analogue states have been found. The extensive level structure obtained is qualitatively consistent with the concept that most of the levels are due to the fragmentation of the 1 g 9 2 , 2 p 1 2 , 2 p 3 2 and 1 f 5 2 neutron-hole strengths by isospin splitting and core-polarization

A three Ge(Li) compton polarimeter for nuclear-reaction gamma-rays

Abstract A convenient arrangement of three Ge(Li) detectors has been employed for the measurement of linear polarization of γ-rays from nuclear reactions. Method and performance involved in this system are described. An example is given describing the determination of the spin, parity and the associated γ-ray multipole mixing ratio for the 1401 keV level of 48 Sc with the 48 Ca(p, nγ) reaction.

Level structure of 89Zr via the reaction 90Zr(p, d)89Zr

Abstract Levels in 89Zr up to about 13 MeV have been excited via the reaction 90Zr(p,d)89Zr. The over-all level structure obtained is qualititively consistent with the concept that most of the levels are due to 9 2 , 2 p 1 2 , 2 p 3 2 , 1 f 5 2 , and possibly 1 7 2 neutron hole states fragmented by isospin splitting and core-polarization effects.

Analog states excited with the 93Nb(p, d)92Nb reaction

Abstract Excited states up to about 13 MeV in 92 Nb have been investigated with the 93 Nb(p, d) 92 Nb reaction. Two prominent l n = levels at E x = 11.54 and 11.80 MeV were found. These are attributed to the analogs of the possible 5 − and 4 − levels in 92 Zr. The sum of the transition strengths for these two states, in comparison with the 2 p 1 2 analog state pick-up strength in the 90 Zr(p, d) 89 Zr reaction, implies that the percentage of the (2 p 1 2 ) 2 proton configuration in 93 Nb is 60 ± 12 %.

Level structure of 48Sc from the 48Ca(p, nγ) reaction

Abstract Levels of 48 Sc up to 3.33 MeV excitation were studied by the reaction 48 Ca(p,nγ) 48 Sc employing a variety of experimental techniques. A level scheme of 48 Sc comprising 29 excited states and 54 transitions were determined from the measurements of γ-γ coincidences and γ-ray excitation functions. Within the framework of the statistical compound nucleus model spins and parities of the 48 Sc levels were assigned from the angular distributions and linear polarizations of the de-excitation γ-rays as well as the excitation functions of the residual levels. From the present experimental results and other available data we tentatively identified some of the levels of the ( 1 f 7 2 9 , 1 d 3 2 −1 ) , ( 1 f 7 2 9 , 2 s 1 2 −1 ), ( 1 f 7 2 7 , 2 p 3 2 ) and ( 1 f 7 2 7 , 1 f 5 2 ) configurations in addition to the well-known ( π f 7 2 , v f 7 2 −1 ) multiplet.