Search

We report on first results from experiments using the ( α , α ′ γ ) reaction at E α = 136 MeV to investigate bound electric dipole (E1) excitations building the so-called Pygmy Dipole Resonance (PDR) in the semi-magic nucleus 140Ce. The method of ( α , α ′ γ ) allows the separation of E1 excitations from states of higher multipolarity, provides an excellent energy resolution and therefore allows a detailed analysis for each single state. Studying bound E1 excitations in α-scattering experiments at intermediate energies becomes feasible for the first time even in nuclei with a high level density. The surprising results of the first experiment on 140Ce point to a splitting of the PDR in this nucleus.

The direct particle decay of the isoscalar giant dipole resonance (ISGDR) has been studied in Pb-208 using the (alpha,alpha'p) and (alpha,alpha'n) reactions at a bombarding energy of 200 MeV. The direct-decay channels of proton and neutron emissions were observed in coincidence with the scattered a-particles in order to study the population of proton-hole states in Tl-207 and neutron-hole states in Pb-207. The results of the partial and total branching ratios allowed us to test recently performed continuum-RPA (CRPA) calculations for the ISGDR and thereby to learn about its microscopic structure.

Gamow-Teller transitions in fp-shell nuclei have been studied using the 58 Ni( d , 2 He) charge exchange reaction at an incident energy of 170 MeV and forward angles. The measurements have been performed at AGOR using the Big-Bite Spectrometer and the EuroSuperNova focal-plane detection system. The unprecedented energy resolution of about 130 keV FWHM for excitations in the residual nucleus 58 Co allowed for the first time the extraction of single transitions in the β + direction up to about 4 MeV excitation. The impact on electron-capture rates in astrophysical environments has been evaluated.

The giant resonance regions of 90 Zr, 116 Sn, 144 Sm and 208 Pb were investigated using 240 MeV α particle scattering at small angles including 0°. E1 strengths corresponding to 91±11%, 89±10%, 105±12% and 95±13% of the isoscalar E1 energy-weighted sum rule were identified beteen 18≤E x ≤31 MeV, 16≤E x ≤30 MeV, 15≤E x ≤27 MeV and 15≤E x ≤25 MeV with centroid energies of 24.8±0.4 MeV, 22.5±0.3 MeV, 21.6±0.3 MeV and 19.3±0.3 MeV and rms widths of 3.2±0.2 MeV, 3.5±0.2 MeV, 3.2±0.2 MeV and 2.5±0.2 MeV for 90 Zr, 116 Sn, 144 Sm and 208 Pb, respectively. Parameters obtained for the isoscalar giant monopole resonance, isoscalar giant quadrupole resonance and high energy octupole resonance are in agreement with accepted values.

The isoscalar giant dipole resonance (ISGDR) in 208 Pb has been investigated using inelastic scattering of 200 MeV α particles at and near 0° where the angular distribution of the ISGDR can be clearly differentiated from other modes. The “difference of spectra” technique was employed to separate the contribution from the high-energy octupole resonance (HEOR). Preliminary angular distribution data provide clear evidence for the ISGDR adjacent to the HEOR.

A cross section enhancement, persisting to high momentum transfer, has been observed around 1HBAR omega in excitation energy in spectra from inelastic proton-, alpha- and electron scattering on Zr-90, Sn-116, Pt-196 and Pb-208. Data are presented for (p,p') at 201 MeV, (alpha,alpha') at 120 MeV and analyzed together with existing data obtained with 133.8 MeV polarized ((p) over right arrow,p') on Sn-116 and electron-scattering data on Sn-116 and Pt-196. Two different interpretations of the observed enhancement are discussed: that of the incoherent sum of all 1HBAR omega cross section and alternatively the sum over the isoscalar normal modes of all multipolarities.

The microscopic structure of both the Gamow-Teller resonance (GTR) at Eχ = 15.6 MeV and the spin-flip ΔL=1 resonances at higher excitation energies in 208Bi has been investigated by observing their direct proton decay to the 3p12, 2f52, 3p32, 1i32 and 2f72 neutron-hole states in 207Pb, following their excitation via the 208Pb (3He,t) reaction at E(3He) = 450 MeV. Decay protons were measured at backward angles in coincidence with tritons detected at very forward angles including θ = 0°. The total widths of the resonances as well as total and partial proton escape widths were determined and compared to theoretical estimates for the GTR. Using the same experimental set-up and conditions proton decay of the spin-flip ΔL=1 resonances in 12C was also measured.

Spin-isospin excitations in nuclei have been studied by means of the ( 3 He,t) reactions at 450 MeV. The Gamow-Teller (GT) resonances are found to be strongly excited. A fine structure of the giant Gamow Teller resonances in medium-heavy nuclei is observed with an energy resolution of 130 keV. The volume integrals of the effective interactions J στ and J τ have been determined experimentally. The importance of high resolution observation of the ( 3 He,t) reactions at intermediate energies, both, to study the double β decay processes and to measure the detection sensitivities for solar neutrino experiments is discussed.

The statistical γ-ray decay of the compound nucleus 154 Dy ∗ formed at an excitation energy of 69 MeV is studied in three angular-momentum windows 〈 J 〉 = 31,42 and 50ℏ. The GDR strength function extracted from the data indicates a constant centroid energy for the resonance E GDR = 15.2 ± 0.5 MeV, a small deformation of the nuclear shape for all spin regions and an increase in the resonance width with increasing angular momentum. The latter might indicate larger shape fluctuations at higher angular momenta. A systematical study of the dependence of the extracted strength function with different methods of analysis is presented, and their discrepancies discussed.

The (Pb(He,t)Bi)-Pb-208-He-3-Bi-208 reaction has been studied with the RCNP ring cyclotron at E(He-3) = 450 MeV using the magnetic spectrometer Grand Raiden at theta = 0-degrees. The Gamow-Teller resonance is strongly excited at this bombarding energy. Its microscopic structure has been investigated by measuring the direct proton decay to the neutron-hole states in Pb-207. The branching ratio for proton emission of a few % is much smaller than that for the decay of the isobaric analog state. The total width of the Gamow-Teller resonance as well as its total and partial escape widths have been determined. Several recent theoretical estimates for the escape width differ from the measured values by factors of approximately 2.5.

Spin-isospin excitations in nuclei have been studied by means of the (3He,t) reactions at 450 MeV on the targets sBe, natC, *%ii, 58Ni, 62Ni, seZr, l18Sn, **OSn, 124Sn, and 154Sm. The new spectrometer “Grand Raiden” was employed for the (3He,t) study for the first time. Observed (3He,t) spectra at 0’ show remarkable similarity with those from the (p,n) results at intermediate energies, suggesting a simple direct reaction mechanism for the (3He,t) reaction at 450 MeV. The GamowTeller (GT) resonances and the spin-flip AL=1 resonances are excited very strongly. A fine structure of the GT resonances in medium-heavy nuclei is observed with an energy resolution of 210 keV. It is demonstrated that the (3He,t) reaction at 450 MeV is a powerful tool to study the spin-isospin excitations in nuclei.

Single-neutron pick-up via the (d, t) reaction was studied at E d = 50 MeV on all stable, even- A tin isotopes with an emphasis on the pick-up from the first major shell below the valence shell. The deeply bound hole states thus observed exhibit themselves as a gross structure phenomenon with a systematic variation of its width as a function of neutron number. The most extensive study was done for the 116 Sn(d, t) 115 Sn reaction for which angular distributions were obtained not only for the deeply bound hole states but also for the pick-up of valence nucleons, and for the excitation of the isobaric analogue states. A DWBA analysis yielded the full sum-rule strength for the pick-up of the valence nucleons. It located in the gross structure about 45% of the combined 1g 9 2 , 2p 1 2 , 2p 3 2 and 1f 5 2 strength. Additional strength may be found in the continuous “background” on which the gross structure peaks are riding. A systematic study of the gross structure shapes and cross sections in all odd- A tin isotopes is presented. The observed variation in the spreading of the 1g 9 2 hole strength as a function of neutron number is compared with recent calculations.

The decay of the isoscalar giant monopole and quadrupole resonances in 90 Zr has been studied with the 90 Zr(α, α'n) 89 Zr and the 90 Zr(α, α'p) 89 reactions. For the giant monopole resonance (GMR), a branching ratio for (neutron : proton : alpha) decay of (85(20) : 10(2) : ( case9 2 + ground state of 90 Zr. The proton decay spectrum of the GMR is also in overall agreement with statistical model calculations. The proton as well as neutron decay from the region of the giant quadrupole resonance (GQR) indicate that in the singles (α, α') cross section the L >2 excitation amounts to 25–50% of the L = 2 cross section.

The 51 V(d, 3 He) 50 Ti reaction was studied at E d = 52.9 MeV with an energy resolution of about 25 keV. The differential cross sections were compared with DWBA calculations. Up to 7 MeV excitation energy, 33 levels were found corresponding to l = 3, l = 0 and l = 2 pick-up. In addition three possible l = 1 transitions were observed. Realistic uncertainties to be assigned to extracted spectroscopic factors were determined by investigating the influence of different optical models, finite-range effects and different prescriptions for the bound-state wavefunction. In one of these prescriptions, electron-scattering data were used to reduce the uncertainty related to the rms radius of the bound-state wavefunction in the DWBA calculations. The experimental results are compared with the theoretical estimates.

The 115 In(d, 3 He) 114 Cd reaction was studied at E d = 50 MeV. For transitions to states in 114 Cd in the excitation energy range 0–5.3 MeV angular distributions were obtained, most of them corresponding to l p = 1(2 p 1 2 , 2 p 3 2 ) or l p = 4(1g 9 2 ) transfer. From DWBA analysis spectroscopic factors were extracted and compared with sum rules. An 8 + state at 3.25 MeV is proposed. A comparison with semi-microscopic model calculations is made.

The cross sections for excitation of the members of the ground state (g.s.) band 0 − (g.s.), 2 + (1.37 MeV) and 4 + (4.12 MeV) and the γ-band 2 + γ (4.24 MeV), 3 γ + (5.24 MeV) and 4 γ + (6.01 MeV) in 24 Mg have been measured in inelastic α-scattering at E α = 120 MeV. The excitation of these states are found to be well described by a coupled-channel calculation (CCBA) performed in the framework of the asymmetric rotational model. Two sets of parameters are found to give excellent fits to the data, but in both a direct coupling between the ground state and the 4 + state is found necessary.

The fission probabilities and angular distributions of the fission fragments for the (α, α'f) reaction on 232 Th and 238 U at a bombarding energy of 120 MeV have been measured from about 4 to 14 MeV excitation energy. Evidence for sub-barrier resonances has been found, the negativeparity ones occurring at the same excitation energy where photofission resonances have been observed. The data are analyzed with the two-humped barrier model. For 238 U the data are reasonably well fitted with barriers similar to those known from the literature. For 232 Th though, the outer barrier parameters are quite different: the height E B = 6.6 MeV and the width ( khω ) B = 1.2 MeV. Also for 232 Th, introducing an additional mass symmetric and axially asymmetric outer barrier, as was previously found necessary for 238 U, does not result in a good fit to the data at higher excitation energies.

The 64 Ni and 64 Zn(d, 3 He) reactions have been studied at a deuteron energy of 55 MeV. Proton pickup strengths for l = 1 transitions in 63 Co and 63 Cu amounted to 0.4 and 1.7, respectively, in comparison to l = 3 strengths of 7.6 and 8.3, respectively. Proton pickup strength from the 2 s 1 2 and 1d deeply bound states is also observed in both nuclei with about half of the sum rule limit for each configuration.

The 104 Ru(d, 3 He) 103 Tc reaction has been investigated at E d = 50 MeV. Transitions to 22 states in 103 Tc were studied. The measured angular distributions were compared with DWBA calculations, from which l -transfers and spectroscopic factors were deduced. To investigate the possible onset of quadrupole deformation around N = 60, the potential energy curves for the oddmass 97–103 Tc isotopes was calculated. Excited states were studied with the IBFA model.

In this paper we present data on the charged-particle decay of the isoscalar 2+ strength between 10 and 20 MeV excitation energy (Ex) in 24Mg and 40Ca. The isoscalar strength was excited by inelastic scattering of 120MeV α-particles at 14° and 12.5° for 24Mg and 40Ca, respectively. The charged particles originating from the decay were detected in coincidence with the α′ particles at several angles in the scattering plane. Jπ assignments of the decaying states were made on the basis of the angular correlation pattern of the α0 decay to the ground state of 20Ne and 36Ar, respectively, using a DWBA calculation for the m-state population of the decaying state. For 40Ca, about 40% of the E2 EWSR is found to be located in the interval Ex = 13.5 ± 1.5 MeV, which is similar to what has been found from previous inelastic scattering experiments at Ex = 18 ± 2 MeV, but much more than such experiments located in the region Ex = 12–15 MeV. The difference for the region Ex A similar conclusion can be drawn from the behaviour of the forward-backward asymmetry in the angular correlations of the decay particles as a function of the excitation energy FBA(Ex). For 40Ca, FBA(Ex) for all decay channels increases smoothly on the average once Ex is above a well-defined threshold, which is due to the onset of knock-out processes. For 24Mg, however, the FBA(Ex) for the α0 shows a large fluctuation as a function of Ex, indicating an interference process between semi-direct decay and knock-out processes.

Proton-stripping and pickup on 193Ir have been studied via the (3He, d) and (d, 3He) reactions, to test the U(6/4) dynamical supersymmetric scheme proposed by Iachello. While the pickup data are in global agreement with this scheme, the strong population of the 2+2 state in 194Pt by l = 2 transfer seems to constitute a serious violation of it. Breaking also occurs through admixtures of the s 1 2 and d 5 2 shells and partial spectroscopic factors have been obtained. In addition, a state in 194Pt at Ex = 2.88 MeV, the nature of which is not known, is observed to be strongly excited in the (3He, d) reaction by an admixture of l = 0 and l = 2 transfer. States in 194Pt that together with states in 192Os and 193Ir belong to the same N + M = 8 supermultiplet are tentatively identified. The assumptions underlying the supersymmetric coupling scheme are discussed.

The 48Ca(3He, t)48Sc reaction has been studied at E3He = 66 MeV and 70 MeV. Angular distributions are given from θ = 8° to 35°. The 0+–7+ multiplet in 48Sc is strongly excited at these energies and the spectra are further characterized by some broad structures on a continuous background. Broad peaks at Eex = 7.8, 10.6 and 13.3 MeV have an angular distribution similar to the low-lying 1+ state. The broad peaks are interpreted as envelopes of groups of 1+ states carrying a significant part of the Gamow-Teller strength. The strength distribution is consistent with a shell-model calculation. The reaction mechanism has been examined at 66 MeV. The cross section is calculated for the 0+–7+ multiplet in 48Sc as a coherent sum of one-step and two-step processes. The two-step contribution is calculated in a full finite-range 2nd-order DWBA. The result is similar contributions from (3He, α, t) and (3He, d, t). The calculations account reasonably well for the data with the exception of the transition to 0+, IAS.

The nucleus 16F was studied via the 16O(3He, t) reaction at 81 MeV. Differential cross sections for many states were obtained and interpreted with DWBA calculations, using microscopic wave functions and an effective projectile-nucleon interaction. Proton decay to several states in 15O was observed and angular correlations for protons in coincidence with tritons detected at θ = 0° were measured. Several spin-parity assignments have been made. The distribution of isovector ΔL = 1 strength could be deduced. The analog of the giant dipole resonance ( E x ⋍ 9.5 MeV ) is strongly excited. The magnetic quadrupole strength has two strong components, one low, at Ex = 0.424 MeV, and one high, at E x ⋍ 7.5 MeV . Evidence is given for a proportionality between cross section and M2 strength for transitions to Jπ = 2− states, which possibly make the (3He, t) reaction a suitable tool for determining quantitatively isovector M2 (or Bij) strengths.

The 16O(α,α′)16O reaction was studied at Eα = 104 MeV in the region of the giant resonances (GR). A prominent structure which could be resolved into various components is observed between Ex = 17 and 25 MeV. The components of the structure above Ex = 20 MeV vary in shape with angle indicating the existence of various multipolarities. DWBA calculations were performed with the collective form factor prescription. For l = 0, 1 and 3, DWBA calculations were also performed using microscopic wave functions. The forward angular behaviour of the structure between Ex = 23 and 24 MeV is found to be consistent with l = 0 transfer, while for other components of the structure above E x = 20 MeV , l≧3 contributions could not be excluded. The fraction of the isoscalar quadrupole energy weighted sum rule (EWSR) exhausted between Ex = 17 and 25 MeV is 40−10%+20%. Our extracted isoscalar quadrupole strength distribution agrees qualitatively with theoretical results. Many states of well known spin and parity are excited below Ex = 17 MeV. Satisfactory fits could be obtained for the natural parity states with DWBA using the collective form factor prescription except for the 2+ state at 9.85 MeV and 4+ state at 10.35 MeV and the 1−, T = 0 states. For the 2+ and 4+ states, coupled channel calculations (CC) describe the experimental angular distributions correctly, while for the 11− states we obtain good fits using a microscopic wave function description of these states.

The (3He, t) charge-exchange reaction leading to the ground-state isobaric analog states (IAS) of 152, 154, 156, 158, 160Gd, 160,162Dy, 162,164,166,168,170Er, 170, 172, 174, 176Yb and 176, 178, 180Hf has been studied at θL = 0° and E( 3 He) = 60.5 MeV . The reaction 28Si(3He, t)28P was used for energy calibration. The centroid energies of most IAS were determined to ±6 keV. Coulomb displacement energies have been extracted from the measured Q-values. They display the influence of non-spherical nuclear shapes which increase the rms radii and lower the Coulomb displacement energies. The dependence on both quadrupole and hexadecapole deformations is apparent with deformation parameters in good agreement with results from other measurements. The total widths Γ of the IAS are in the range 30 to 110 keV. They increase more strongly with neutron excess than is known for the IAS of the Sn and Te isotopes. The width of the IAS of 176Yb is anomalously low. The zero-degree (3He, t) cross sections are in the range 5 to 20 μb/sr. They generally increase with neutron excess except for the sequence of Yb isotopes. No systematic dependence on (N − Z) appears to exist. Excitation energies and zero-degree cross sections for the reactions 28Si(3He, t)28P, 16O(3He,t)16F and 12C(3He,t)12N are reported.

The fission decay channel of 232 Th and 238 U has been investigated, using the (α, α'f) reaction at 120 MeV bombarding energy. The angular distributions of the fission fragments and the fission probabilities up to around 15 MeV excitation have been measured. No evidence for the fission decay of the giant quadrupole resonance has been found, although for 238 U, a weakly excited structure is seen in the (α, α'f) spectrum at about 9.5 MeV excitation at backward angles with respect to the recoil axis. This effect is similar to what has been found in a ( 6 Li, 6 Li'f) experiment reported recently. The over-all feature of the fission probability for excitation energies above the fission barrier are well reproduced by statistical calculations.

Total and escape widths of IAS in even-A Pm isotopes have been measured via the ANd(3He, t)APm and ANd(3He, t p )A−1Nd reactions. Values for the spreading widths have been deduced and found to increase strongly with the excitation energy of the IAS through the chain of Pm isotopes. This behaviour, in contrast with the much smoother global increase with mass number, is attributed to a dependence on level density.

The decay of the isoscalar giant monopole resonance (GMR) in 208 Pb has been studied with the 208 Pb(α, α'n) 207 Pb reaction at θ α ′ = 0°. Comparison of the experimental data with detailed statistical model calculations shows a good overall agreement for the decay of both the GMR and the underlying continuum. Interpreting small discrepancies between the calculations and data for the GMR as indications for the presence of pre-equilibrium decay we find a direct decay branch of the GMR ⩽ 10% and a pre-equilibrium decay branch ⩽ 30%.

Neutron pickup was studied on all stable even- A Pd isotopes via the (d, t) reaction at E d = 50 J , S , and single-particle centroid energies. MeV and the ( 3 He, α) reaction at E 3He = 70 MeV. A systematic study of the de region is made. From a decomposition of angular distributions we obtain spectroseopic strength distributions for the 1 g 9 2 , 2 p 1 2 , 2 P 3 2 and 1 f 5 2 Subshells which exha rules. Complete studies of the 102, 104 Pd(d, t) 101, 103 Pd reactions are presented for pickup from the valence shells. For all isotopes spectroscopic information on the strongest transitions to low-lying states is obtained.

A study of the nucleus 12 N has been performed using the 12 C( 3 He, t) reaction at bombarding energies of 75 and 81 MeV. Differential cross sections were measured and interpreted using an effective projectile-nucleon interaction and microscopic wave functions. Proton decay to final states in 11 C was measured by recording coincidences tritons emitted at 0° and protons detected at several backward angles. From the triton angular distributions and the triton-proton angular correlations strong suggestions can be made about the location of J π = 2 − , 1 − and 0 − strengths in 12 N. The ΔL = 1 strength distributions are compared with the results of shell-model calculations.

The γ-decay from the evaporation residues formed in the 50Ti + 50Ti → 100Ru★ and 50Ti+110Pd → 160Er★ reactions with angular momentum up to the maximum these systems can sustain, has been studied utilizing a sum spectrometer in coincidence with two smaller NaI detectors. The excitation energy and average angular momentum are determined as a function of γ-ray cascade energy. Simultaneously, the structure of the γ-ray continuum and its multipolarity is obtained as a function of these two correlated parameters. From the centroid energy of quadrupole transitions between states confined to a narrow spin region an effective moment of inertia is extracted. For the products of the 100Ru compound system a large deformation, is indicated by a moment of inertia as large as 1.3 times the spherical rigid-body value for I ≳ 40 ƒ. This is considerably lower in angular momentum than the transition to triaxial shape predicted for a rotating liquid drop. The moment of inertia for the residues of the 160Er compound system is 5–15 % larger than the spherical rigid body value. For both systems studied a considerable part of the decay is due to dipole transitions of rather low energy (< 1 MeV) even at the highest spins where a quadrupole bump is well developed.

The inelastic α-scattering reaction at Eα = 120 MeV with an energy resolution of 90–150 keV has been used to investigate isoscalar strength distributions in 24, 26Mg, 28Si and 40Ca. For 24, 26Mg and 28Si the E2 strength between Ex = 14 and 27 MeV is strongly fragmented. In 40Ca the E2 strength is mainly concentrated near E x ~ 65 A 1 3 MeV, although here the onset of fragmentation can be observed. The sum rule strength for the different multipolarities was obtained by applying for each nucleus an L-dependent normalization procedure. In this way we observed in total in 24, 26Mg, 28Si and 40Ca for excitation energies up to 27 MeV an amount of (61+8−6), (50+9−8), (38+8−6) and (94 ± 14)%, respectively, of the isoscalar E2 energy weighted sum rule (EWSR) of which (36+7−5), (28+8−7), (24+7−5) and (74 ± 12)% was found between Ex = 14 and 27 MeV. In addition isoscalar E0, E3 and E4 strength was observed in this excitation energy region. A detailed comparison has been made between the isoscalar quadrupole strength distribution observed in the 24, 26Mg(α, α') reaction and the E2 strength excitation function obtained from radiative α-capture measurements. In the low excitation energy region coupled channel effects have been observed, especially for the excitation of the 3+ states. Moreover, a considerable percentage of the 1ħω isoscalar dipole and octupole strength has been observed for excitations below 14 MeV.

The ( 3 He, t) reaction has been studied on the targets 12 C, 16 O, 24 Mg, 26 Mg, 28 Si, 32 S, 42 Ca, 48 Ca, 54 Fe, 58 Ni and 90 Zr at incident energies 66–90 MeV. From angular distributions of transitions to selected states the parameters V ρ , V σρ , V Tρ and V LSρ of an effective projectile-nucleon force parametrized with single Yukawa potentials have been obtained for this energy domain. Differences from the force proposed earlier by Schaeffer for a lower energy are found, notably in the tensor component.

The fission decay of 238 U has been investigated using inelastic scattering of 120 MeV ga-particles to excite the 238 U nucleus. Angular correlations of the fission fragments have been measured for excitation energies between 5.7 and 15.7 MeV in coincidence with inelastically scattered α-particles between 0 and 3°. The difference in yield for fission in coincidence with inelastically scattered α-particles between 0–1.35° and 1.35–3° was used to deduce the fission decay of the giant monopole resonance. It was found that in the fission decay channel (22 ± 5)% of the E0 EWSR strength is located between 8 and 15 MeV excitation energy. The distribution of the deduced monopole strength is in agreement with recent theoretical calculations predicting splitting of the giant monopole resonance in deformed nuclei.

The levels in 107Rh have been investigated via the γ-rays following the β− decay of 3.75 min 107Ru. The ruthenium activity was produced in the thermal neutron-induced fission of 239Pu and separated chemically from the fission product mixture with the on-line centrifuge system SISAK. The emitted γ-rays were studied by γ singles and γγ(t) coincidence measurements. In addition, the 108Pd(d, 3He) reaction was investigated at Ed = 50 MeV to study the proton-hole states in 107Rh. From the comparison of the measured angular distributions with DWBA calculations l-transfers and spectroscopic factors were deduced. The obtained level scheme of 107Rh is discussed and compared with neighbouring nuclei and with recent calculations in the framework of the interacting boson-fermion (IBFM-1) model.