P. J. Twin's research while affiliated with University of Liverpool and other places
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Publications (202)
The level structure of Er158 has been studied using the Gammasphere spectrometer via the Cd114(Ca48,4n) reaction at 215 MeV with both thin (self-supporting) and thick (backed) targets. The level scheme has been considerably extended with more than 200 new transitions and six new rotational structures, including two strongly coupled high-K bands. Co...
High spin states in the isotope 194Hg were populated using the 150Nd (48Ca,4n) reaction at a beam energy of 213 MeV. A sequence of dip ole transitions has been observed above 8 MeV excitation energy. Cross-over transitions have also been identified. An interpretation connecting this sequence to a nuclear shape change is attempted. A comparison with...
The N sim 90 region of the nuclear chart has featured prominently as the
spectroscopy of nuclei at extreme spin has progressed. This talk will
present recent discoveries from investigations of high spin behavior in
the N sim 90 Er, Tm and Yb nuclei utilizing the Gammasphere gamma-ray
spectrometer. In particular it will include discussion of the bea...
The Euroball array has been used to search for linking transitions between the superdeformed (SD) and the normal deformed (ND) wells in 151Tb. Many γ rays in the energy range 2–4 MeV have been observed in coincidence with the yrast SD band. It is proposed that the highest energy transition of 3748 keV and the strongest line (2818 keV) of the previo...
Cited References Count:28|AMER PHYSICAL SOC|ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA|Robin, J.|Odahara, A.|Duchene, G.|Beck, F. A.|Twin, P.|Byrski, Th.|Curien, D.|Adimi, N.|Appelbe, D. E.|Bednarczyk, P.|Bracco, A.|Cederwall, B.|Courtin, S.|Cullen, D. M.|Dorvaux, O.|Ertueck, S.|de France, G.|Gall, B.|Joshi, P.|King, S. L.|Korichi, A.|Lager...
The experimental study of the unresolved rotational bands, forming ridge structures in γ-γ spectra, has been performed on the superdeformed nucleus 151Tb. γ transitions from the reaction 27Al, at 155 MeV, on 130Te were measured with EUROBALL IV in high fold coincidence. The analysis of the intensities and count fluctuations of the ridge structures...
States in 130Ce have been studied using 16O induced reactions on 117Sn and 118Sn targets. Mean lifetimes have been measured for the yrast states up to Jπ = 22+ using both the Doppler shift attenuation and recoil distance methods. Magnetic dipole transition rates have been deduced from branching ratio measurements within a band based on an isomeric...
A new frontier of discrete-line gamma-ray spectroscopy at ultrahigh spin has been opened in the rare-earth nuclei (157,158) Er. Four rotational structures, displaying high moments of inertia, have been identified, which extend up to spin approximately 65 variant Planck's over 2pi and bypass the band-terminating states in these nuclei which occur at...
The low intensities of excited superdeformed (SD) bands in 152Dy are evidence of a shell closure at Z = 66 and N = 86. In the A = 150 region the excited SD bands are based on simple particle-hole excitations. It is proposed that most of the excited bands in 152Dy are of this type but also that one band is primarily based on a collective octupole vi...
This article descibes the first experimental observation of the gamma rays associated with suprdeformed shapes in ¹âµÂ²Dy, elucidates the current understanding of the various properties of the superdeformed bands in nuclei close to ¹âµÂ²Dy, and summarizes the current experimental situation in the associated region of highly deformed nuclei near...
The N=86,87 isotopes of dysprosium and holmium have been investigated using the Eurogam II γ-ray spectrometer. A new collective rotational band has been observed in 153Ho and the previously observed vi13/2 band in 153Dy has been extended to much higher spin. Comparing these bands and similar bands in 152Dy with the collective bands in the N=90 isot...
The N=86,87 isotopes of dysprosium and holmium have been investigated using the Eurogam II γ-ray spectrometer. A new collective rotational band has been observed in 153Ho and the previously observed νi13/2 band in 153Dy has been extended to much higher spin. Comparing these bands and similar bands in 152Dy with the collective bands in the N=90 isot...
The high-spin decay scheme of 155Er, known previously, has been considerably extended by using the EUROGAM II γ-ray array. The so-called quasi-isotropic gating data-analysis method, capable of providing spin and parity assignments with triple or quadruple coincidence data has been used. With such coincidence information, we have determined γ-ray an...
The levels of 34S from 5.4 MeV to 7.3 MeV excitation energy have been studied by particle- gamma ray angular correlation experiments using the reaction 34P( alpha ,p)34S. Spin assignments of 2, 3, 4, 4, 1, 2 and 2 have been made to the levels at 5.680, 6.173, 6.250, 6.415, 6.480, 7.112 and 7.220 MeV respectively. Spin restrictions have been placed...
The nucleus 35Cl has been studied using the reaction 32S( alpha ,p gamma )35Cl. Proton-gamma ray angular correlations have been measured using an E/DE telescope to detect the protons. Gamma ray linear polarizations have been measured with a three Ge(Li) Compton polarimeter. The levels at 4348 keV, 5408 keV and 6088 keV have been shown to have spins...
The decay properties of the levels at 3.941(3+), 5.476(4+) and 5.716 MeV (4+) in 26Mg have been investigated. Particle gamma-ray angular correlations were measured following the reactions 26Mg( alpha , alpha ' gamma )26Mg and 26Mg(p,p' gamma )26Mg enabling accurate branching ratios and E2/M1 mixing ratios to be determined. The lifetimes were obtain...
Two new rotational bands have been observed in the 152Dy nucleus following experiments performed using the EUROGAM γ-ray spectrometer. Several transitions have been observed that link these new bands into the known single-particle states. Using the Doppler shift attenuation method, the quadrupole moment of the previously-known rotational sequence h...
Following an experiment with the GAMMASPHERE γ-ray spectrometer, eight new superdeformed (SD) bands have been observed in the nucleus
64150Gd86. This brings the total number of SD bands in 150Gd to fourteen, the largest number observed in any nucleus, allowing an examination of the single-particle states close to the nuclear Fermi Surface to be per...
Double step resolved γ-ray transitions linking the yrast superdeformed (SD) band of 149Gd to the normal deformed (ND) level scheme have been observed using the EUROGAM phase II spectrometer. The excitation energy of the 47/2− SD state above the 7/2− ground state has thus been determined to be 10.625 MeV. The most likely multipolarity of the linking...
This paper presents the characteristics of a new generation of composite germanium detectors: the Clover detector. Its development was based on simulation calculations performed with the code GEANT3. An extensive study of its main characteristics involving the photopeak detection efficiency, the energy resolution and the timing performed with sourc...
A long run performed with EUROGAM II allowed remeasuring the Gd-149 superdeformed (SD) band 1. The Delta I = 4 bifurcation in band 1 is confirmed and two resolved gamma-ray transitions linking the SD band 1 and the normal deformed states have been observed.
A long run performed with EUROGAM II allowed remeasuring the
149Gd superdeformed (SD) band 1. The Δ I = 4
bifurcation in band 1 is confirmed and two resolved γ -ray
transitions linking the SD band 1 and the normal deformed states have
been observed.
The states at 4226 keV, 5453 keV and 5638 keV in 33P were studied by means of the reaction 30Si ( alpha ,p gamma )33P. New decay modes were observed for the 4226 keV and 5638 keV levels and branching ratios determined. The proton-gamma ray angular correlation of the 1227 keV gamma ray de-exciting the 5453 keV level was measured, using an annular co...
High spin states in 42Ca have been excited with the 39K( alpha ,p)42Ca reaction at bombarding energies of 9.5 MeV and 16.0 MeV. Levels at 5491, 5744, 6145, 6409, 6554 and 7369 keV were shown to have Jpi of 6-, 7-, 7(-), 8-, 9- and 10-(8-) respectively. Lifetimes for the 5491, 5744 and 6145 keV levels were determined to be 85+or-20 fs, 600+or-140 fs...
The structures of the nuclei 65,67Zn have been investigated by the techniques of gamma -ray spectroscopy in conjunction with the reactions 62,64Ni( alpha ,n)65,67Zn. Gamma-gamma coincidence measurements and yield curve measurements have been used to elucidate the decay schemes. Measurements of gamma -ray angular distributions and linear polarizatio...
A gamma -ray spectroscopic study of the high spin states of the nucleus 152Dy has been performed using the reaction 108Pd(48Ca,4n)152Dy at a bombarding energy of 205 MeV. Gamma rays were detected using the TESSA3 multi-detector array. A set of discrete-line states forming a rotational band has been observed in the data and has been shown to extend...
Gamma-ray decays from states in 129Ce have been studied using 16O-induced reactions on 116Sn and 117Sn targets. Previously known positive- and negative-parity bands have been extended to spins of 31/2 and 39/2, respectively. Band crossings are seen for the first time in 129Ce and occur near the same rotational frequency as the h112/ proton band cro...
A rotational band has been found in 132Ce which has a high moment of inertia. This band decays by a series of discrete transitions in the spin range (20-40) h(cross) and is more strongly populated above 26 h(cross) than the yrast band known previously. These data are discussed in terms of the predicted shape change expected along the yrast line of...
The deformed nucleus 130Ce has been studied using the techniques of in-beam gamma -ray spectroscopy. Beams of 16O and 18O were used on targets of 116,117,118Sn to obtain excitation energies, mean lifetimes, spins, parities, mixing ratios and branching ratios. The gamma - gamma coincidence data necessary to determine the decay scheme were obtained u...
The decay scheme and level structure of the neutron-deficient isotope 61Zn have been investigated up to an excitation energy of 2.4 MeV using gamma -ray spectroscopy techniques following the 58Ni( alpha ,n gamma )61Zn reaction. Using beam energies in the range 10.75-16.0 MeV, excitation functions gamma - gamma coincidences, n- gamma coincidences, a...
The 4.350 MeV(3+) and 5.716 MeV(4+) states in 26Mg have been studied with particle gamma ray angular correlation measurements using the reactions 26Mg( alpha alpha ' gamma ) 26Mg with Ge(Li) detectors. Branching ratios and E2/M1 mixing ratios were deduced; in particular a new 815 keV transition (5.716 to 4.901 MeV) has been found. The E2 transition...
States in 61Ni were populated using the 58Fe( alpha ,n gamma )61Ni and the 53Cr(11B,p2n gamma )61Ni reactions. Gamma-gamma coincidence measurements at alpha particle energies of 8.0, 8.5 and 12.0 MeV and at a 11B energy of 30 MeV were used to determine the decay scheme. Excitation energies, gamma ray branching ratios, angular distributions, linear...
The first 2+ states of the target nuclei 46Ti, 48Ti and 58Ni were populated by inelastic scattering of 7Li with beam energies just above the Coulomb barrier. Differential cross sections of elastic and inelastic scattering were measured. Coulomb-nuclear interference in the inelastic channel of each reaction was observed. Analyses were performed in t...
For pt.I see ibid., vol.4, p.755 (1978). The techniques of gamma -ray spectroscopy have been employed to investigate the structure of levels below 2.0 MeV in excitation energy in 67Zn populated in the 64Ni( alpha ,n)67Zn reaction. Gamma-gamma coincidences have been recorded at several alpha -particle beam energies. Gamma-ray angular distributions a...
Twenty excited states below 6.8 MeV and with spins up to J=(9) have been observed in 60Ni in the reaction 56Fe(7Li, p2n gamma ). Lifetimes of levels have been determined from DSA and RD measurements. Gamma-ray angular distribution and linear polarisation measurements have been made and unambiguous Jpi assignments deduced. Several new high-spin stat...
The reaction 58Ni(6Li,pn gamma )62Zn was used to populate levels in 62Zn at bombarding energies between 15 and 24 MeV. Gamma-gamma and neutron-gamma coincidence measurements at beam energies of 20 and 24 MeV were used to establish a decay scheme up to 7.4 MeV in excitation. Spins and parities of the levels together with branching and mixing ratios...
Electromagnetic decay transitions in 63Zn and 63Cu have been studied using the 60Ni( alpha ,n gamma )63Zn and 60Ni( alpha ,p gamma )63Cu reactions at incident beam energies of 9.5-19.0 MeV, the 54Fe(11B,np gamma )63Zn and 54Fe(11B,2p gamma )63Cu reactions at EB=30.0 MeV, and the 58Ni(7Li,pn gamma )63Zn reaction at ELi=20.0 MeV. Gamma-gamma coincide...
The odd-proton nuclei 127La and 129La have been investigated to high spin using gamma -ray spectroscopy. Seven new states have been found in 127La, while in 129La six new states were seen. In both nuclei, the yrast band has been extended to Jpi =47-/2 allowing a band crossing to be found at a rotational frequency near 0.5 MeV/h(cross). Angular corr...
The 196Pb nucleus was populated via the 184W(16O,4n)196Pb and 186W(16O,6n)196Pb reactions at beam energies of 98 MeV and 120 MeV, respectively. A new Delta I=1 magnetic dipole band has been observed. This band is believed to be built on a collective oblate configuration involving high-K proton orbitals coupled to two rotationally aligned i13/2 neut...
The level structure of 70Se has been studied with the aid of the 58Ni(14N, pn gamma )70Se and 60Ni(12C, 2n gamma )70Se reactions. A decay scheme has been established from results of gamma-gamma and neutron-gamma coincidence experiments. Spin and parity assignments of 2+ (945 keV), 2(+) (1600 keV), 4+ (2039 keV) and 6+ (3003 keV) have been deduced f...
Mean lifetimes of 83Sr, 84Sr and 85Sr levels have been measured by DSAM. The reactions used were (α,nγ) and (α, 2nγ) with solid krypton targets. Angular distribution and linear polarisation measurements yielded several multipole mixing ratios and Jπ assignments. The Jπ of the 4.9 h isomer in 85Y is shown to be 2/9+.
The nuclei 198-200Bi were populated via the 186W(19F,xn)198-200Bi reaction at beam energies of 115 MeV and 105 MeV. Another experiment, aimed at investigating the high-spin-level structure of 203,204Bi, used the 198Pt(11B,xn) reaction at a beam energy of 74 MeV. Five new Delta I=1 rotational structures, consisting of stretched magnetic dipole trans...
High-spin states in 48Cr have been investigated with the 36Ar(14N,pn gamma )48Cr and 40Ca(10B,pn gamma )48Cr reactions. Mean lifetimes or limits have been obtained for the following levels: 0.75 MeV (10.6+or-1.1 ps), 1.86 MeV (1.9+or-0.5 ps), 3.45 MeV (<1.0 ps), 3.53 MeV (3.6+or-1.0 ns), 4.06 MeV (40+or-10 ps) and 5.19 MeV (<1.2 ps). New spin-parit...
The 61Ni ( alpha ,n gamma ) 64Zn reaction has been studied 8.6 MeV and 9.35 MeV bombarding energies together with the 56Fe(11B, p2n gamma )64Zn reaction at 30 MeV bombarding energy. The gamma -ray decay scheme of 64Zn has been deduced up to 5.7 MeV excitation by means of gamma - gamma coincidence experiments and n- gamma coincidence experiments. Sp...
States in 61Ni were populated using the 58Fe( alpha ,n gamma )61Ni reaction. Gamma-gamma coincidence measurements at beam energies of 8.0, 8.5 and 12.0 MeV were used to determine the decay scheme. Excitation energies, gamma ray branching ratios angular distributions, linear polarizations and mixing ratios for levels below 2.2 MeV in excitation were...
The neutron-deficient isotope 66Ge has been studied using gamma-ray spectroscopy techniques. States in 66Ge were populated using the 58Ni(10B,pn gamma )66Ge reaction at bombarding energies of 28.5, 29 and 30 MeV. A decay scheme has been established from the results of gamma-gamma and neutron-gamma coincidence experiments performed at a beam energy...
The Eurogam I gamma -ray array has been used to search for the linking transitions between the superdeformed (SD) and normal deformed states in 152Dy. Triple gamma -ray coincidence data were analysed by employing the technique of summation of discrete gamma -rays observed in coincidence with the transitions in the lowest energy (yrast) SD band in 1...
The electromagnetic decay transitions of the low-lying negative parity states below 1.5 MeV in excitation energy in 63Zn have been studied using the 60Ni( alpha ,n gamma )63Zn reaction (Q value=-7.905 MeV), at incident beam energies of 8-16 MeV. Spins and parities of the levels, together with the branching and mixing ratios of their gamma ray decay...
States in 64Zn were populated using the 61Ni( alpha ,n gamma )64Zn reaction at a beam energy of 7.8 MeV. Excitation energies, gamma ray branching ratios, angular distributions, linear polarisations and centroid shifts were measured for levels in 64Zn below 3.1 MeV in excitation. Electromagnetic multipole mixing ratios were determined for many of th...
A high statistics experiment performed on Gd nuclei with the use of the EUROGAM II array resulted in the discovery of twelve new superdeformed (SD) bands. Three of them have been assigned to 148Gd and seven to 149Gd giving a total of thirteen SD bands now known in this last nucleus. The close relationship in transition energies between these bands...
The quadrupole moments of the first two superdeformed (SD) bands in the nucleus 151Tb have been measured with the Doppler Shift Attenuation Method (DSAM) using the EUROGAM %-ray spectrometer. The first excited band (B2) is identical to the yrast SD band of 152Dy in terms of dynamical moments of inertia and %-ray energies. The measured relativ...
In a recent experiment performed with the EUROGAM II γ-ray spectrometer three superdeformed (SD) bands have been established in 153Ho. The properties of these bands are discussed in terms of single-particle proton excitations and are compared with respect to the SD magic nucleus 152Dy. These results represent the first observation of SD structures...
In a recent experiment carried out with theEurogam Phase II γ-ray spectrometer three new superdeformed (SD) bands have been established in153Ho. The properties of these SD bands are discussed in terms of proton particle-hole excitations and are compared to the SD bands in the adjacent nuclei. This is the first observation of SD structures in aZ=67...
Three experiments have been carried out to search for the existence of Hyperdeformed states (HD) in the nucleus152Dy. These three experiments were designed to test different properties of the expected HD structures. As a result of these experiments no clear evidence for HD states in152Dy has been observed.
Four new superdeformed (SD) bands have been observed in {sup 147}Gd using the EUROGAM II spectrometer. By comparison with {sup 146,148,149}Gd SD bands, we use the effective alignment to assign excited band configurations, with the support of the Nilsson-Strutinsky cranking formalism. The effect of the crossing of the [642]5/2 and [651]1/2 neutron o...
The aim of this work is to get more informations about the decay-out of superdeformed bands. One of the best candidates in the mass A ≃ 150 region for that kind of research is the nucleus 151Tb. From previous works, it has been established that the first excited band goes lower in frequency than the band SD(1) [2], and it is the only known case in...
High spin states in the isotope194Hg were populated using the150Nd (48Ca,4n) reaction at a beam energy of 213 MeV. The analysis ofγ-γ coincidences has revealed two new structures at excitation energies above 6 MeV and at moderate spin. The two structures
are a manifestation of the deviation of nucleus from the collective rotation which dominates it...
Precise level lifetimes have been measured for various superdeformed bands in 148,149Gd and 152Dy with the Doppler-shift attenuation method. From the derived quadrupole moments, Q0, we find large differences in deformation between the yrast bands and some excited bands in the gadolinium isotopes. Moreover, two of the excited Gd bands and the 152Dy...
Precise level lifetimes have been measured for various superdeformed bands in {sup 148,149}Gd and {sup 152}Dy with the Doppler-shift attenuation method. From the derived quadrupole moments, {ital Q}{sub 0}, we find large differences in deformation between the yrast bands and some excited bands in the gadolinium isotopes. Moreover, two of the excite...
The goal of this communication is to propose a model of interaction of the cultures based on the concept of radiation by analogy with the quantum model of the light. Just as the light can be considered in modern physics either a flow of particles or an undulation, in the same way, to the granular dimension of the information emitted by an organizat...
The new generation of high-efficiency gamma-ray spectrometers allows the collection of high-fold gamma-ray coincidence data. Some problems associated with the sorting and subsequent analysis of this data are discussed. A method is presented to allow the creation of statistically correct spectra when selection criteria are placed on gamma-ray energi...
Two new superdeformed (SD) bands have been observed in 150Tb using the reaction 31P+124Sn and the GAMMASPHERE detector array. These new bands are interpreted as being excited SD configurations involving a proton and a neutron particle-hole excitation, respectively. The configurations are discussed in terms of the occupancy of high-N intruder orbita...
One of the four new excited superdeformed bands found in 151Dy is characterized by transition energies that lie midway between the γ-ray energies of the yrast superdeformed band in 152Dy. This result adds significant new information on the issue of “identical” bands, as it confirms predictions based on the strong coupling model and the pseudospin c...
Six rotational bands built on superdeformed intrinsic configurations have been observed in the 149Gd nucleus with the Eurogam spectrometer. Orbital configuration assignments have been suggested on the basis of their effective alignments calculated with the Nilsson-Strutinsky cranking model. Most of the excited bands have identical partners in neigh...
Data from the EUROGAM I array has given many new insights into superdeformed nuclei at high rotational frequency. The occupation of the high-N intruder orbitals can be obtained from data on moments of inertia. The role and importance of static pairing correlations and their quenching at high frequencies are discussed. There is evidence of a ΔI=4 st...
Candidates for two excited superdeformed (SD) bands based on unfavoured signature partners of proton particle-hole excitations in the 152Dy core have been observed in the 151Tb nucleus with the EUROGAM spectrometer. In the framework of cranked shell model calculations, one of these bands is interpreted as the signature partner of the 151Tb yrast ba...
Excited states in the nucleus151Tb have been investigated up to spin 91/2 ħ and energy 16.5 MeV using the 130Te(27Al, 6n) reaction and the EUROGAM array. The theoretical interpretation of the level scheme has been performed in the framework of the deformed independent particle model. The feeding patterns of the normal-deformed states by both the yr...
An excited superdeformed (SD) band in [sup 150]Gd is associated with a two-particle--two-hole proton excitation and provides the first evidence for collective proton pair excitations in a SD nucleus. This band is seen to exhibit a discontinuity in the [gamma]-ray transition energies (backbending), which is interpreted as a band crossing associated...
Five excited superdeformed bands have been observed in the doubly closed-shell superdeformed nucleus 152Dy. Three of the new bands are interpreted in terms of single neutron excitations across the N = 86 shell gap. One of these bands appears to partly decay into the yrast superdeformed band. Another band involves a single proton excitation across t...
Based on data obtained with the Eurogam spectrometer, a systematic investigation of superdeformed bands built on single neutron excitations across the N = 86 shell gap has been carried out for gadolinium, terbium, and dysprosium isotopes with 85 less-than-or-equal-to N less-than-or-equal-to 87. In each nucleus, pairs of bands corresponding to degen...
The discovery of rotational bands associated with superdeformed shapes was linked with developments in gamma-ray instrumentation.
These developments have continued and the EUROGAM I array has improved the observational limit by an order of magnitude. Many
excited bands in theA=150 region have been found and their properties show their particle-hole...
Excited states in the nucleus150Tb have been investigated up to spin 39 h{combining short stroke overlay} and 13 MeV excitation energy using the130Te(27Al, 7 n) reaction and the EUROGAM array. The theoretical interpretation of the observed states has been performed in the framework of the deformed independent particle model. The analysis of the dec...
The moment of inertia of the yrast superdeformed band in 149Gd exhibits an unexpected bifurcation at high rotational frequency. States differing by four units of angular momentum show an energy shift of about 60 eV. This indicates the remnant of a new quantum number associated with the fourfold rotational symmetry.
Dipole transitions linking signature partner superdeformed bands in [sup 193]Hg have been observed. Measurements of the photon decay branching ratios, taken together with the average superdeformed quadrupole moment measured in neighboring nuclei, enable the absolute [ital M]1 strengths to be determined. From these data, using the strong coupling mo...
Relative intensities of the yrast and the first excited superdeformed bands in 151Tb have been accurately measured, with the EUROGAM spectrometer. It is shown that he excited band depopulates at the same freqeuncy and spin as its identical band in the isotone 152Dy whereas the yrast band deexcites at higher rotational frequency and spin even though...
The superdeformed (SD) structure of 150Gd has been studied using the Eurogam gamma-ray spectrometer and three new SD bands have been discovered. An interaction is observed between two of the SD bands caused by the near degeneracy of two levels. This is the first observation of accidental degeneracy between SD states. The interaction strength is det...
Eight superdeformed rotational bands have been observed in the [sup 149]Gd nucleus. Several excited bands have partners in neighboring nuclei which differ by up to four nucleons, with nearly identical dynamic moments of inertia and quantized [gamma]-ray phasing. These observations cannot be easily explained by theoretical models including an intrin...
The EUROGAM array has recently completed its first experiments. The results of these will be described together with an assessment of the performance of the array in terms of its Resolving Power and its improvement of the peak/background ratio for weak gamma-rays associated with superdeformed bands.
An experiment has been carried out using the Eurogam array which consisted of 42 escape suppressed germanium detectors in order to study the properties of the superdeformed structures in 151Tb. A first 4-dimensional analysis of the data show that these superdeformed bands decay out at different rotational frequencies, with the yrast superdeformed b...
