Nuclear isospin effect on α -decay half-lives

Akrawy, Dashty T.; Hassanabadi, H.; Hosseini, S. S.; Santhosh, K. P.

doi:10.1016/j.nuclphysa.2018.04.001

Cited by 30 publications

(12 citation statements)

References 28 publications

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“…The more direct evidence is that is positively correl- ated with isospin asymmetry of parent nuclei having the same values [2]. Isospin asymmetry is an important factor affecting the density distribution of protons and neutrons, which is expected to play a more important role in the preformation of the nucleus [17,[36][37][38][39][40]. This leads us to consider that isospin asymmetry may be a key for determination of preformation factors.…”

Section: Resultsmentioning

confidence: 99%

Improved empirical formula for α particle preformation factor *

Zhang

2021

Chinese Phys. C

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In this contribution, the preformation factors of 606 nuclei are extracted within the framework of the generalized liquid drop model (GLDM). Through the systematic analysis of the preformation factors of even-even Po-U isotopes, we found that there is a significant weakening of influence of shell closure in uranium, which is consistent with the results of a recent experiment [J. Khuyagbaatar et al., Phys. Rev. Lett. 115, 242502 (2015)], implying that may not be the magic number for U isotopes. Furthermore, we propose an improved formula with only 7 parameters to calculate preformation factors suitable for all types of -decay; it has fewer parameters than the original formula proposed by Zhang et al. [H. F. Zhang et al., Phys. Rev. C 80, 057301 (2009)] with higher precision. The standard deviation of the preformation factors calculated by our formula with extracted values for all 606 nuclei is 0.365 with a factor of 2.3, indicating that our improved formula can accurately reproduce the preformation factors. Encouraged by this, the -decay half-lives of actinide elements are predicted, which could be useful in future experiments. Notably, the predicted -decay half-lives of two new isotopes Np [Z. Y. Zhang, et al., Phys. Rev. Lett. 122, 192503 (2019)] and Np [H. B. Yang et al., Phys. Lett. B 777, 212 (2018)] are in good agreement with the experimental -decay half-lives.

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Section: Resultsmentioning

confidence: 99%

Improved empirical formula for α particle preformation factor *

Zhang

2021

Chinese Phys. C

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“…x i is the i th reading of data set, υ is the mean of the data set. We found that NMHF has minimum RMSE (0.56) and uncertainties (±0.09 s) as tested it on 40 experimental data within the range 111≤Z≤118 and 161≤N≤192 while compared to other similar, latest fitted and known formulas such as Royer2020 [92], MYQZR2019 [91], Akrawy2018 [93], Modified RenB2019 [89], MRF2018 [95], DK2018 [95], Modified Budaca Formula (MBuF2022) [37], UF2022 [96], IUF2022 [97], ISEF2022 [98], new modified Sobiczewski formula (NMSF2021) [38] and new modified Manjunatha formula (NMMF2021) [38]. Consequently, the present calculations of α-decay half-lives are performed by using NMHF [38] which incorporates the terms related to (i) angular momentum taken away by the α-particle and (ii) asymmetry of the parent nucleus.…”

Section: α-Decaymentioning

confidence: 99%

“…For the selection of α-decay half-lives formula, we have tested few recently fitted/modified empirical/semiempirical formulas [25,34,37,38,60,[89][90][91][92][93][94][95][96][97][98] and the comparison among these formulas is shown in Table 1. For the comparison, we use root mean square error (RMSE) and uncertainty (u), which are calculated by using the following formulas:…”

Section: α-Decaymentioning

confidence: 99%

History of Department of Neurology at S.M.S. Medical College, Jaipur

Jain

2020

Neurol India

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A comprehensive study of favoured and unfavoured α-decay, cluster decay, weak-decay along with spontaneous fission in undetected superheavy nuclei within the range for proton number 111≤Z≤118 and neutron number 161≤N≤192 is performed. Half-lives for various mentioned decays are estimated with good accuracy on the basis of NUBASE2020 and are found in excellent match with the known half-lives. α-decay mode is found most probable in this wide range and correspondingly potential α-decay chains are reckoned. Peculiarly, the chances of cluster emission, as well as weak-decay, are also anticipated in this region of the periodic chart which open new pathways of detection of superheavy nuclei.

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“…A semiempirical relation was suggested by Poenaru and Ivascu [14] for the alpha decay fission theory for all groups of nuclei. Moreover, the half-lives for e-e, e-o, o-e, and o-o nuclei with alpha decay in the range 52 118 have been tested within the Royer modified formula including new Royer coefficients obtained by the fitting of 356 isotopes [15]. Superheavy isotopes probe the extremes of the structure of nuclei with respect to the mass number of nuclei for a bound system.…”

Section: Introductionmentioning

confidence: 99%

Revisiting to the Geiger–Nuttal Relation to be Employed in the Estimation of the Half-Lives of Superheavy Nuclei

Al-jomaily¹,

Khalil²

2020

Ukr. J. Phys.

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The half-lives for the even–even (e–e), even–odd (e–o), odd–even (o–e) and odd–odd (o–o) nuclei in the range 100 < Z < 120 have been tested within the Viola–Seaborg formula (VSF) and within the analytical formula of Royer (RF). We proposed another formula (Present Work Formula or PWF) with regard for the effect of angular momentum of the alpha decay particle and with the use of the relative neutron excess (︀(N−Z)/A)︀. Our formula includes a new set of parameters found by the least square fitting method of alpha decays of 128 nuclei. We obtained the standard deviations for each of the formulas for comparison. The results show an acceptable agreement with available data. The values of the suggested theoretical coefficient (K) for the PWF show a similar behavior of half-lives with a-decay, which can be used to predict the new superheavy nuclei.

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Nuclear isospin effect on α -decay half-lives

Cited by 30 publications

References 28 publications

Improved empirical formula for α particle preformation factor *

Improved empirical formula for α particle preformation factor *

History of Department of Neurology at S.M.S. Medical College, Jaipur

Revisiting to the Geiger–Nuttal Relation to be Employed in the Estimation of the Half-Lives of Superheavy Nuclei

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