Collective enhancement in nuclear level density

Mohanto, G.; Parihari, A.; Rout, P. C.; De, S.; Mirgule, E. T.; Srinivasan, B.; Mahata, K.; Behera, S. P.; Kushwaha, M.; Sarkar, D.; Nayak, B. K.; Saxena, A.; Kumar, Arvind; Gandhi, A.; Sangeeta, .; Deb, Nabendu Kumar; Arumugam, P.

doi:10.1103/physrevc.100.011602

Cited by 13 publications

(6 citation statements)

References 14 publications

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“…In summary, the measured γ-gated proton spectrum is predominantly from the compound nuclear process, which is ensured by the coincidence measurement with selected γ rays from the residues of p2n and pn channels following the 9 Be+ 64 Ni reaction. The γ gated proton spectrum has been utilized to obtain the level densities of residual nuclei ( 72 Ga and 71 Ga).…”

Section: (B)mentioning

confidence: 99%

“…Reliable nuclear level densities are therefore very crucial in the determination of nuclear reaction rates in the field of nuclear astrophysics [4,5]. In addition, the enhancement in the NLD due to collective degrees of freedom (such as rotation and vibration) i.e collective enhancement [6][7][8][9] is another puzzling topic [8]. The collective enhancement present in the NLD, especially around the particle separation energy, could have a significant role in the particle capture cross-sections.…”

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confidence: 99%

“…The 9 Be beam of 30 MeV energy with an average current of 5 nA from BARC-TIFR Pelletron Linac Facility, Mumbai, was used to bombard a self-supporting 64 Ni target of thickness 500 µg/cm 2 , populating the 73 Ge compound nucleus (CN). The outgoing protons were detected by using CsI(Tl) detectors with the angle of coverage from 22 • to 67 • .…”

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confidence: 99%

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Collective enhancement in nuclear level density of $^{72}$Ga and its effect on $^{71}$Ga(n, $γ$)$^{72}$Ga capture cross-section

Santra¹,

Dey²,

Roy³

et al. 2022

Preprint

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The γ-gated proton spectra measured in the reactions 64 Ni( 9 Be, p2n) 70 Ga and 64 Ni( 9 Be, pn) 71 Ga, have been utilized to obtain the nuclear level density (NLD) of 71 Ga and 72 Ga nuclei by using the statistical model (SM) calculations. It is seen that the γ-gated proton spectrum are reasonably explained by using the large value of the inverse level density parameter (k = 11.2 MeV) in the NLD prescription of the Fermi gas (FG) model. The large value of k is indicative of the rotational enhancement, which is consistent with the earlier results in other mass regions. Furthermore, a rotational enhancement factor has been included in the NLD and used in the SM calculation keeping the systematic value of k=8.6 MeV and it explains the γ-gated proton spectrum nicely. The result clearly indicates the presence of collective enhancement in NLD. Subsequently, the NLD with collective enhancement has been utilized in the TALYS calculation, for the first time, to calculate the 71 Ga(n, γ) 72 Ga capture cross-section. It is observed that, while the FG model without the collective enhancement in the NLD for 72 Ga under predicts the capture data, with the rotational enhancement correction the FG model over predicts the data by similar amount at higher energies. However, in the energy range of 0.01 MeV to 0.1 MeV, the FG model corrected for rotational enhancement describes the data quite well. Thus, the present work indicates that collective enhancement, whenever required, should be taken into account fro proper description of low energy capture cross section data.

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Section: (B)mentioning

confidence: 99%

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confidence: 99%

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Collective enhancement in nuclear level density of $^{72}$Ga and its effect on $^{71}$Ga(n, $γ$)$^{72}$Ga capture cross-section

Santra¹,

Dey²,

Roy³

et al. 2022

Preprint

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“…The (Z − Z 0 ) dependence of the level densities may be quite sensitive to the single-particle energies which may change drastically as one moves away from the β-stability line. Consequently, the other microscopic effects such as collective enhancement due to rotational and vibrational states [21][22][23][24][25][26][27][28][29], pairing and shell corrections [30][31][32][33][34][35][36] will also be crucial in determining the behavior of level density around Z 0 [12,21,37]. One of the ways to include various microscopic effects in the level density parameter is through the semi-classical approach.…”

Section: Introductionmentioning

confidence: 99%

Nuclear level densities away from line of β-stability

Ghosh¹,

Maheshwari²,

Arora³

et al. 2022

J. Phys. G: Nucl. Part. Phys.

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The variation of total nuclear level densities (NLDs) and level density parameters with proton number Z are studied around the β-stable isotope, Z0, for a given mass number. We perform our analysis for a mass range A=40 to 180 using the NLDs from popularly used databases obtained with the single-particle energies from two different microsopic mass-models. These NLDs which include microscopic structural effects such as collective enhancement, pairing and shell corrections, do not exhibit inverted parabolic trend with a strong peak at Z0 as predicted earlier. We also compute the NLDs using the single-particle energies from macroscopic-microscopic mass-model. Once the collective and pairing effects are ignored, the inverted parabolic trends of NLDs and the corresponding level density parameters become somewhat visible. Nevertheless, the factor that governs the (Z-Z0) dependence of the level density parameter, leading to the inverted parabolic trend, is found to be smaller by an order of magnitude. We further find that the (Z-Z0) dependence of NLDs is quite sensitive to the shell effects.

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Section: Introductionmentioning

confidence: 99%

Nuclear level densities away from line of $β$-stability

Ghosh,

Maheshwari,

Saxena

et al. 2021

Preprint

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The variation of total nuclear level densities (NLDs) and level density parameters with proton number (Z) are studied around the β-stable isotope, Z 0 , for a given mass number. We perform our analysis for a mass range A = 40 to 180 using the NLDs from popularly used databases obtained with the singleparticle energies from two different microsopic mass-models. These NLDs which include microscopic structural effects such as collective enhancement, pairing and shell corrections, do not exhibit inverted parabolic trend with a strong peak at Z 0 as predicted earlier. We also compute the NLDs using the singleparticle energies from macroscopic-microscopic mass-model. Once the collective and pairing effects are ignored, the inverted parabolic trends of NLDs and the corresponding level density parameters become somewhat visible. Nevertheless, the factor that governs the (Z − Z 0 ) dependence of the level density parameter, leading to the inverted parabolic trend, is found to be smaller by an order of magnitude. We further find that the (Z − Z 0 ) dependence of NLDs is quite sensitive to the shell effects.

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Collective enhancement in nuclear level density

Cited by 13 publications

References 14 publications

Collective enhancement in nuclear level density of $^{72}$Ga and its effect on $^{71}$Ga(n, $γ$)$^{72}$Ga capture cross-section

Collective enhancement in nuclear level density of $^{72}$Ga and its effect on $^{71}$Ga(n, $γ$)$^{72}$Ga capture cross-section

Nuclear level densities away from line of β-stability

Nuclear level densities away from line of $β$-stability

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