Angular momentum dependence of the nuclear level density parameter

Aggarwal, Mamta; Kailas, S.

doi:10.1103/physrevc.81.047302

Cited by 16 publications

(79 citation statements)

References 28 publications

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“…For Z R = 49, 50, and 51 (Z R is the atomic number of the evaporation residue) k was found to be constant while for the other cases it was observed to increase with increasing angular momentum. On the other hand theoretical calculations for similar systems showed that the inverse level density parameters should increase for all the cases [4]. On contrary, in a measurement of angular momentum gated neutron evaporation spectra for A ~ 118, E * ~ 31 MeV and 43 MeV and J ~ 10-20 ħ, we have observed that the inverse level density parameter (k) decreases with increasing angular momentum [5].…”

Section: Introductioncontrasting

confidence: 66%

“…The theoretical neutron energy spectra were calculated using the statistical model code CASCADE [9], with the extracted angular momentum distributions for different folds as the input. The experimental neutron energy spectra for 4 He +…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…On contrary, in a measurement of angular momentum gated neutron evaporation spectra for A ~ 118, E * ~ 31 MeV and 43 MeV and J ~ 10-20 ħ, we have observed that the inverse level density parameter (k) decreases with increasing angular momentum [5]. In another recent study, in order to understand the variation of the level density parameter with angular momentum in a more systematic manner we have simultaneously measured all (major) the light-particle (n, p, and α) evaporation spectra along with the γ -ray multiplicity in 4 [6]. In this study a systematic trend of decrease of inverse level density parameter with the increase in angular momentum (J~ 10-20 ħ) has been observed from the study of all three evaporation spectra, for both systems.…”

Section: Introductionmentioning

confidence: 90%

“…It will be interesting to extend this kind of study for relatively heavy systems. In this paper we report our new measurement on angular momentum gated neutron evaporation spectra for the 4 …”

Section: Introductionmentioning

confidence: 99%

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Angular momentum dependence of the nuclear level density parameter

Gohil

Roy

Banerjee

et al. 2014

EPJ Web of Conferences

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Abstract. Neutron evaporation spectra alongwith γ-multiplicity has been measured from the 185 Re* compound nucleus at the excitation energies ~27 and 37 MeV. Statistical model analysis of the experimental data has been carried out to extract the value of the inverse level density parameter k at different angular momentum regions (J) corresponding to different γ-multiplicity. It is observed that, for the present system the value of k remains almost constant for different J. The present results on the angular momentum dependence of the nuclear level density (NLD) parameter ã (=A/k), for nuclei with A ~180 is quite different from our earlier measurements in case of light and medium mass systems. The present analysis provides useful information to understand the angular momentum dependence of NLD at different nuclear mass regions.

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Section: Introductioncontrasting

confidence: 66%

Section: Experiments and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Angular momentum dependence of the nuclear level density parameter

Gohil

Roy

Banerjee

et al. 2014

EPJ Web of Conferences

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“…The atomic nucleus comprises a unique system in that it exhibits both microscopic features [42] and statistical aspects generally explained in terms of level density [43]. The nuclear level density as a function of excitation energy is an important fundamental property which is used to derive all thermodynamical quantities such as entropy and specific heat of the excited nuclei.…”

Section: Introductionmentioning

confidence: 99%

Nuclear Specific Heat and Phase Transition in Finite Nuclear Systems

Boomadevi¹,

Saranya²,

Selvaraj³

et al. 2014

Acta Phys. Pol. B

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A statistical theory incorporating temperature, angular momentum and deformation degrees of freedom for complex nuclear system has been developed. An investigation for nuclear specific heat as a function of temperature and angular momentum is provided. The occurrence of a peak structure in the specific heat at temperatures of the order of 2.0-3.0 MeV confirms the phase transitions for seven even-even 2s-1d shell nuclei.

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Dependence of spin induced structural transitions on level density and neutron emission spectra

Aggarwal

2019

Nuclear Physics A

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The impact of spin induced deformation and shape phase transitions on nuclear level density and consequently on neutron emission spectra of the decay of compound nuclear systems 112 Ru to 123 Cs (N = 68 isotones) is investigated in a microscopic framework of Statistical theory of superfluid nuclei. Our calculations are in good accord with experimental data for evaporation residue of 119 Sb and 185 Re and show a strong correlation between spin induced structural transitions and NLD. We find that the inverse level density parameter 'K' increases with increasing spin for all the systems, but it decreases with a deformation or a shape change that results in the enhancement of level dnesity and emission probability. A sharp shape phase transition from oblate to uncommon prolate non-collective in well deformed nuclei leads to band crossing and enhancement of level density which fades away while approaching sphericity at or near shell closure manifesting shell effects.

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Angular momentum dependence of the nuclear level density parameter

Cited by 16 publications

References 28 publications

Angular momentum dependence of the nuclear level density parameter

Angular momentum dependence of the nuclear level density parameter

Nuclear Specific Heat and Phase Transition in Finite Nuclear Systems

Dependence of spin induced structural transitions on level density and neutron emission spectra

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