The European Physical Journal A最新文献_第4页

First identification of a magnetic rotational band in 190Tl 1990年首次发现磁旋转带

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-11 DOI: 10.1140/epja/s10050-025-01678-3

Snigdha Pal, G. Mukherjee, S. S. Nayak, S. Basu, Shabir Dar, Sneha Das, S. Chakraborty, R. Banik, C. Majumder, R. Palit, P. Dey, A. Kundu, Biswajit Das, Vishal Malik, R. Kumar, S. Rajbanshi, B. S. Naidu, S. K. Jadhav, A. T. Vazhappily

{"title":"First identification of a magnetic rotational band in 190Tl","authors":"Snigdha Pal, G. Mukherjee, S. S. Nayak, S. Basu, Shabir Dar, Sneha Das, S. Chakraborty, R. Banik, C. Majumder, R. Palit, P. Dey, A. Kundu, Biswajit Das, Vishal Malik, R. Kumar, S. Rajbanshi, B. S. Naidu, S. K. Jadhav, A. T. Vazhappily","doi":"10.1140/epja/s10050-025-01678-3","DOIUrl":"10.1140/epja/s10050-025-01678-3","url":null,"abstract":"<div>The excited states of 190Tl nucleus have been studied experimentally by populating them in the fusion-evaporation reaction 165Ho(30Si, 5n)190Tl using 157-MeV beam, delivered from the BARC-TIFR pelletron LINAC facility. The de-excited ( gamma )-rays were detected using the INGA array with 17 Compton-suppressed clover HPGe detectors connected with a digital data acquisition system. A new positive parity band with a sequence of M1 transitions has been observed in 190Tl and identified as a Magnetic Rotational (MR) band. This band been described under the framework of Semi-Classical Model (SCM). The band is assigned a four quasiparticle configuration (pi i_{13/2}) (otimes ) (nu (i_{13/2})^{-1}(p_{3/2})^{-2}). Shears mechanism with Principal Axis Cranking (SPAC) model calculations have been performed, which well reproduces the experimentally measured B(M1)/B(E2) values. The Total Routhian Surface calculations suggest a small deformation with non-collective alignment of the angular momentum, corresponding to an oblate shape for the band.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01678-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic rotational band at high excitation energy in 207Po 207Po高激发能下的磁旋转带

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-10 DOI: 10.1140/epja/s10050-025-01680-9

Md. A. Asgar, G. Mukherjee, A. Dhal, T. Roy, Soumik Bhattacharya, R. Banik, S. Bhattacharyya, C. Bhattacharya, K. Banerjee, T. K. Ghosh, S. Kundu, R. Pandey, Pratap Roy, T. K. Rana, S. Manna, A. Sen, D. Mondal, D. Pandit, S. Mukhopadhyay, S. Pal

{"title":"Magnetic rotational band at high excitation energy in 207Po","authors":"Md. A. Asgar, G. Mukherjee, A. Dhal, T. Roy, Soumik Bhattacharya, R. Banik, S. Bhattacharyya, C. Bhattacharya, K. Banerjee, T. K. Ghosh, S. Kundu, R. Pandey, Pratap Roy, T. K. Rana, S. Manna, A. Sen, D. Mondal, D. Pandit, S. Mukhopadhyay, S. Pal","doi":"10.1140/epja/s10050-025-01680-9","DOIUrl":"10.1140/epja/s10050-025-01680-9","url":null,"abstract":"<div>The medium-high spin states in 207Po were investigated by the 208Pb((alpha ), 5n)207Po fusion-evaporation reaction at a beam energy of 60 MeV. The (gamma ) rays were detected using the VENUS (VECC NUclear Spectroscopy) array, consisting of 6 Compton-Suppressed clover HPGe detectors. In this work, a new and improved level scheme of 207Po has been proposed that extends up to an excitation energy of (sim ) 6.9 MeV and a spin of (49/2) (hbar ). The DCO (Directional Correlation of Oriented state) and IPDCO (Integrated Polarization Directional Correlation of Oriented state) ratios were measured to assign the spins and parities of the levels. A magnetic rotational band has been identified for the first time in this nucleus with 5-qp configuration at an excitation energy of 4.8 MeV. This band has been interpreted using a semi-classical shears-band model. A possible crossing with a 7-qp MR band is also suggested.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01680-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the angular distribution for the elastic scattering of (alpha ) particles from tritium at an energy of 84.2 MeV 84.2 MeV能量下氚(alpha )粒子弹性散射的角分布分析

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-10 DOI: 10.1140/epja/s10050-025-01683-6

S. Yu. Mezhevych, O. A. Ponkratenko, N. Keeley, Yu. S. Roznyuk, O. M. Povoroznyk, O. K. Gorpinich, V. I. Grantsev, O. O. Jachmenjov, K. K. Kisurin, S. E. Omelchuk, B. A. Rudenko, L. I. Slyusarenko, B. G. Struzhko, I. I. Vertegel

{"title":"Analysis of the angular distribution for the elastic scattering of (alpha ) particles from tritium at an energy of 84.2 MeV","authors":"S. Yu. Mezhevych, O. A. Ponkratenko, N. Keeley, Yu. S. Roznyuk, O. M. Povoroznyk, O. K. Gorpinich, V. I. Grantsev, O. O. Jachmenjov, K. K. Kisurin, S. E. Omelchuk, B. A. Rudenko, L. I. Slyusarenko, B. G. Struzhko, I. I. Vertegel","doi":"10.1140/epja/s10050-025-01683-6","DOIUrl":"10.1140/epja/s10050-025-01683-6","url":null,"abstract":"<div>New experimental angular distribution data are reported for the (alpha )+t elastic scattering at (E_textrm{lab}(alpha ) = 84.2) MeV ((E_textrm{cm} = 36.09) MeV) covering both forward and backward scattering angles. An analysis was carried out using the coupled-reaction-channels (CRC) formalism including the transfer of a proton between the two triton cores. Automatic searches on the parameters of the (alpha )+t optical model potential of volume Woods-Saxon form, together with the spectroscopic factor (SF), were performed using the code SFRESCO. The inclusion of a proper core-core (t+t) potential was found to be important and led to slightly higher values of the SF being obtained. The deduced value of the SF for the (alpha ) (rightarrow ) t+p overlap (1.33 ± 0.05) agrees very well with that found earlier for the mirror system (^3)He+n. However, both are lower than the value of 2.0 predicted by the shell model. The asymptotic normalization coefficient (ANC) was also deduced and the variations of the SF and (text {ANC}^2) as a function of the radius of the t+p binding potential appear to be different, that of the SF being almost linear while the (text {ANC}^2) increases approximately exponentially with increasing binding potential radius. Nevertheless, the best fit value of the (text {ANC}^2) = 45.5 ± 1.8 (text {fm}^{-1}) was found to be close to those obtained theoretically by Monte Carlo calculations.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the role of intermediate nucleus spectrum on pairing enhancement in a two-nucleon transfer process 探索中间核谱在二核子转移过程中对增强的作用

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-09 DOI: 10.1140/epja/s10050-025-01663-w

G. Singh

引用次数: 0

Experimental determination of the excitation functions of the alpha particle-induced nuclear reactions on rhodium up to 50 MeV 50 MeV以上铑上α粒子诱导核反应激发函数的实验测定

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-08 DOI: 10.1140/epja/s10050-025-01670-x

Ferenc Ditrói, Sándor Takács, Hiromitsu Haba, Masayuki Aikawa, He Huang, Zolbadral Tsoodol, Kenta Sugihara, Shuichiro Ebata, Zoltán Szűcs, Tamás Tornyi

引用次数: 0

Charmonium spectrum and its decay properties Charmonium光谱及其衰减特性

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-05 DOI: 10.1140/epja/s10050-025-01671-w

Zaki Ahmad, Ishrat Asghar, Bilal Masud, M. Atif Sultan

引用次数: 0

Cross-section of the ({^textrm{nat}textrm{Ni}}(gamma ,textrm{p} xtextrm{n})^{58}textrm{Co}) reaction at the bremsstrahlung end-point energy of 35–94 MeV 在轫致拉伸端点能量为35-94 MeV时({^textrm{nat}textrm{Ni}}(gamma ,textrm{p} xtextrm{n})^{58}textrm{Co})反应的截面

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-09-04 DOI: 10.1140/epja/s10050-025-01666-7

I. S. Timchenko, O. S. Deiev, S. M. Olejnik, S. M. Potin, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin, A. Herzáň

{"title":"Cross-section of the ({^textrm{nat}textrm{Ni}}(gamma ,textrm{p} xtextrm{n})^{58}textrm{Co}) reaction at the bremsstrahlung end-point energy of 35–94 MeV","authors":"I. S. Timchenko, O. S. Deiev, S. M. Olejnik, S. M. Potin, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin, A. Herzáň","doi":"10.1140/epja/s10050-025-01666-7","DOIUrl":"10.1140/epja/s10050-025-01666-7","url":null,"abstract":"<div>The photoproduction of the (^{58}textrm{Co}) nuclei on ({^textrm{nat}textrm{Ni}}) was studied using the induced (gamma )-activity method and offline (gamma )-ray spectrometric technique. The experiment was performed at the electron linear accelerator LUE-40 of NSC KIPT, Ukraine. The total flux-averaged cross-section (langle {sigma (E_{gamma textrm{max}})}rangle ) for the ({^textrm{nat}textrm{Ni}}(gamma ,textrm{p} xmathrm n)^{58}textrm{Co}) reaction has been measured in the range of bremsstrahlung end-point energies (E_{gamma textrm{max}}) = 35–94 MeV. The obtained (langle {sigma (E_{gamma textrm{max}})}rangle ) were compared with theoretical estimates, and with experimental data found in the literature. The theoretical values of (langle {sigma (E_{gamma textrm{max}})}rangle _textrm{th}) were calculated using the partial cross-sections (sigma (E)) from the TALYS1.96 code for different level density models and gamma strength functions.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01666-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of excluded volume corrections on hadronic yield in high-energy nuclear collisions 排除体积修正对高能核碰撞强子产率的影响

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-08-28 DOI: 10.1140/epja/s10050-025-01667-6

Sameer Ahmad Mir, Saeed Uddin, Swatantra Kumar Tiwari

{"title":"Influence of excluded volume corrections on hadronic yield in high-energy nuclear collisions","authors":"Sameer Ahmad Mir, Saeed Uddin, Swatantra Kumar Tiwari","doi":"10.1140/epja/s10050-025-01667-6","DOIUrl":"10.1140/epja/s10050-025-01667-6","url":null,"abstract":"<div>This article presents a comprehensive study of various particle ratios involving strange and non-strange hadrons across a wide range of center-of-mass energies from the lowest energies at the Relativistic Heavy Ion Collider (RHIC) to the highest at the Large Hadron Collider (LHC). We utilize the excluded-volume hadron resonance gas (EV-HRG) model to calculate these ratios, assigning a hard-core size to each baryon and anti-baryon to account for repulsive interactions. To explore potential differences in the production mechanisms of strange versus non-strange hadrons, we incorporate a strangeness suppression factor ((gamma _s)) into our formulation. Additionally, we compare our results with those obtained from other theoretical approaches, including the van der Waals (vdW) model, transport models such as the A Multi-Phase Transport (AMPT) model and the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, as well as from effective theory frameworks like the Nambu–Jona–Lasinio (NJL) model. Our analysis shows that a baryon and anti-baryon hard-core radius of 0.59 fm provides a good fit to the experimental data. Overall, this study highlights the strengths and predictive accuracy of various statistical thermal, transport, and effective theory models, with the EV-HRG model demonstrating particularly strong agreement with experimental observations.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental studies of the microscopic structure of the pygmy dipole resonance and comments on a possible pygmy quadrupole resonance 侏儒偶极子共振微观结构的实验研究和对可能的侏儒四极子共振的评论

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-08-26 DOI: 10.1140/epja/s10050-025-01669-4

M. Spieker

{"title":"Experimental studies of the microscopic structure of the pygmy dipole resonance and comments on a possible pygmy quadrupole resonance","authors":"M. Spieker","doi":"10.1140/epja/s10050-025-01669-4","DOIUrl":"10.1140/epja/s10050-025-01669-4","url":null,"abstract":"<div>The pygmy dipole resonance (PDR) has been observed on the low-energy tail of the isovector giant dipole resonance (IVGDR) below and above the neutron-separation threshold. While the additional strength is recognized as a feature of the electric dipole response of many nuclei with neutron excess, its microscopic structure, which intimately determines its contribution to the overall strength, is still poorly understood. This makes reliable predictions of the PDR in neutron-rich nuclei far off stability difficult. It has been shown that the coupling to complex configurations drives the strength fragmentation for both the IVGDR and the PDR, and that more strength gets fragmented to lower energies when including such configurations. The wavefunctions of (J^{pi }= 1^-) states belonging to the PDR are, however, expected to be dominated by one-particle-one-hole (1p-1h) excitations of the excess neutrons. First experiments were performed to access these parts of the wavefunction via inelastic proton scattering through isobaric analog resonances and via one-neutron transfer reactions. The results, obtained from these experiments, will be discussed in this contribution and some new results added. Given the special occasion of Professor Bracco’s university retirement, I will also comment on experimental studies of a possible pygmy quadrupole resonance (PQR).</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the possible existence of a (S=-3), (I=1) pentaquark 关于(S=-3), (I=1)五夸克存在的可能性

IF 2.8 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-08-23 DOI: 10.1140/epja/s10050-025-01664-9

Albert Feijoo, Isaac Vidaña

引用次数: 0