Signature of a possible α-cluster state in N = Z doubly-magic 56Ni

被引：0

作者：

Bagchi, S. ^{[1
,2
,18
]}

Akimune, H. ^{[3
]}

Gibelin, J. ^{[4
]}

Harakeh, M. N. ^{[1
]}

Kalantar-Nayestanaki, N. ^{[1
]}

Achouri, N. L. ^{[4
]}

Bastin, B. ^{[5
]}

Boretzky, K. ^{[2
]}

Bouzomita, H. ^{[5
]}

Caamano, M. ^{[6
]}

Caceres, L. ^{[5
]}

Damoy, S. ^{[5
]}

Delaunay, F. ^{[4
]}

Fernandez-Dominguez, B. ^{[6
]}

Fujiwara, M. ^{[7
]}

Garg, U. ^{[8
]}

Grinyer, G. F. ^{[5
]}

Kamalou, O. ^{[5
]}

Khan, E. ^{[9
]}

Krasznahorkay, A. ^{[10
]}

Lhoutellier, G. ^{[4
]}

Libin, J. F. ^{[5
]}

Lukyanov, S. ^{[11
]}

Mazurek, K. ^{[13
]}

Najafi, M. A. ^{[1
]}

Pancin, J. ^{[5
]}

Penionzhkevich, Y. ^{[11
,12
]}

Perrot, L. ^{[9
]}

Raabe, R. ^{[14
]}

Rigollet, C. ^{[1
]}

Roger, T. ^{[5
]}

Sambi, S. ^{[14
]}

Savajols, H. ^{[5
]}

Senoville, M. ^{[4
]}

Stodel, C. ^{[5
]}

Suen, L. ^{[5
]}

Thomas, J. C. ^{[5
]}

Vandebrouck, M. ^{[15
,16
]}

Van de Walle, J. ^{[1
,17
]}

机构：

[1] Univ Groningen, KVI CART, NL-9747 AA Groningen, Netherlands

[2] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[3] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan

[4] Univ Caen, CNRS, IN2P3, LPC Caen,ENSICAEN, Caen, France

[5] CEA, CNRS, DRF, GANIL,IN2P3, Bvd Henri Becquerel, F-14076 Caen, France

[6] Univ Santiago de Compostela, Santiago De Compostela 15706, Spain

[7] Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan

[8] Univ Notre Dame, Phys Dept, Notre Dame, IN 46556 USA

[9] Univ Paris Saclay, IJCLab, CNRS, IN2P3, F-91405 Orsay, France

[10] Inst Nucl Res ATOMKI, POB 51, H-4001 Debrecen, Hungary

[11] Joint Inst Nucl Res, GN Flerov Lab Nucl React, Dubna 144980, Moscow Oblast, Russia

[12] Moscow Engn Phys Inst, Natl Ctr Nucl Res, Kashirskoe Sh 31, Moscow 115409, Russia

[13] Inst Nucl Phys PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland

[14] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Leuven, Belgium

[15] Univ Paris Sud, IPN Orsay, IN2P3, CNRS, F-91406 Orsay, France

[16] Univ Paris Saclay, Irfu, CEA, F-91191 Gif Sur Yvette, France

[17] SCK CEN, Boeretang 200, B-2400 Mol, Belgium

[18] Indian Sch Mines, Indian Inst Technol, Dhanbad 826004, Jharkhand, India

来源：

EUROPEAN PHYSICAL JOURNAL A | 2020年 / 56卷 / 11期

基金：

美国国家科学基金会;

关键词：

41;

D O I：

10.1140/epja/s10050-020-00294-7

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

An inelastic alpha-scattering experiment on the unstable N=Z, doubly-magic Ni-56 nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for alpha-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the statistical-decay model. The ideal classical gas model at kT = 0.4 MeV reproduces fairly well the experimental momentum distribution and the observed multiplicity of alpha particles corresponds to an excitation energy around 96 MeV. The method of distributed m alpha-decay ensembles is in agreement with the experimental results if we assume that the alpha-gas state in Ni-56 exists at around 113(-17)(+15) MeV. These results suggest that there may exist an exotic state consisting of many alpha particles at the excitation energy of 113(-17)(+15) MeV.

引用

页数：8

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