A Study of the Nuclear Structure at High Energy and Low Spin

Rekstad, J.; Henriquez, A.; Ingebretsen, F.; Midttun, G.; Skaali, Bernhard; Oyan, R.; Wikne, Jon; Engeland, T.; Thorsteinsen, T.F.; Hammarén, E.; Liukkonen, E.

doi:10.1088/0031-8949/1983/t5/007

Cited by 32 publications

(24 citation statements)

References 4 publications

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“…This assumption is true for high level densities where the nucleus is in a compound state prior to γ -emission [13]. The probability for a γ -ray to decay from excitation energy E x to E f , with energy E f = E x − E γ , is proportional to the level density at the final energy E f and the transmission coefficient T (E γ ).…”

Section: Oslo Methodsmentioning

confidence: 99%

Resonances in odd-odd¹⁸²Ta

et al. 2017

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Abstract. Enhanced γ -decay on the tail of the giant electric dipole resonance, such as the scissors or pygmy resonances, can have significant impact on (n,γ ) reaction rates. These rates are important input for modeling processes that take place in astrophysical environments and nuclear reactors. Recent results from the University of Oslo indicate the existence of a significant enhancement in the photon strength function for nuclei in the actinide region due to the scissors resonance. Further, the M1 strength distribution of the scissors resonances in rare earth nuclei has been studied extensively over the years. To investigate the evolution and persistence of the scissor resonance in other mass regions, an experiment was performed utilizing the NaI(Tl) γ -ray detector array (CACTUS) and silicon particle telescopes (SiRi) at the University of Oslo Cyclotron laboratory. Particle-γ coincidences from the 181 Ta(d,p) 182 Ta and 181 Ta(d,d') 181 Ta reactions were used to measure the nuclear level density and photon strength function of the well-deformed 181 Ta and 182 Ta systems, to investigate the existence of resonances below the neutron separation energy.

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Section: Oslo Methodsmentioning

confidence: 99%

Resonances in odd-odd¹⁸²Ta

et al. 2017

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“…Consequently, the statistical gamma decay has been characterized by the emission of dipole radiation [1]. The poor selectivity of the compound nucleus reactions has been pointed out in recent experimental works [2,3] where a new technique based on the (3He, e) reaction have been proposed. This reaction seems to be highly selective and it allows for the determination of nuclear level densities at very low angular momenta and high excitation energies [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The poor selectivity of the compound nucleus reactions has been pointed out in recent experimental works [2,3] where a new technique based on the (3He, e) reaction have been proposed. This reaction seems to be highly selective and it allows for the determination of nuclear level densities at very low angular momenta and high excitation energies [2][3][4]. From the theoretical point of view the data [2][3][4] are particularly interesting because the experimental evidences about nuclear structure effects at high excitation energies, namely: high temperatures, can be compared with model predictions of temperature dependent effects in finite nuclei [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…This reaction seems to be highly selective and it allows for the determination of nuclear level densities at very low angular momenta and high excitation energies [2][3][4]. From the theoretical point of view the data [2][3][4] are particularly interesting because the experimental evidences about nuclear structure effects at high excitation energies, namely: high temperatures, can be compared with model predictions of temperature dependent effects in finite nuclei [5][6][7][8]. Among them, the existence of a transition from a superfluid to a normal phase, and whether this transition manifests itself in finite nuclei, is one of the questions which could eventually be answered in this way.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental method developed by the Oslo Cyclotron Laboratory group [2][3][4], which has been applied to the study of both spherical and deformed nuclei in the A = 150 mass region, demostrates that a significant departure from the Fermi gas level densi-* Fellow of the CONICET, Argentina ty formula has to be considered in order to explain the observed gamma-ray multiplicity pattern [2]. Since the information about level densities is obtained by direct comparison of the calculated multiplicities and the experimental data, the findings of [2] can be interpreted as an indication of changes in the microscopic structure of the decaying nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependent effects and statistical gamma-ray multiplicities in the147Sm(3He, ?)146Sm reaction

Civitarese¹,

Paoli²

1985

Z Physik A

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Gamma-ray multiplicities associated with the statistical decay from highly excited states in 146Sm are calculated. The formalism, which accounts for the temperature dependence of the level density parameter, is applied to the analysis of the statistical gamma decay from states populated by the (3He, e) reaction. The results are found to be in a reasonable agreement with the experimental data.PACS : 25.55. Ek

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